NVGate Specification
The following official specifications concern NVGate® software for OR10, OR34, OR35, OR36, OR38 and Mobi-Pack® multi-analyzer instruments. These specifications apply for on-line analysis and post analysis with or without the instrument connected to the PC. This specification applies for NVGate version 12 or upper and Teamwork instruments.
Modules
NVGate® software is based on a general-purpose platform where optional analysis modules called plug-in analyzers are added.
The FFT plug-in features specific add-on for specialized analysis.
NVGate®Platform
NVGate® platform provides a comprehensive set of tools for noise and vibration acquisition, recording and analysis.
These functions are arranged in 4 parts:
- Signal sources that condition, provide and store time domain signals.
- Shared resources that apply simultaneously or independently on distributed signal to plug-in analyzers.
- Operational tools that increase measurement efficiency and reliability.
- General-purpose analysis for monitoring and result tracking.
| Signal sources |
Front-end |
Controls dynamic inputs, generators, external synchronization/tach. input and parametric (DC) inputs. |
|
Recorder |
Record and store time domain signal on analyzer or PC hard disc. Records dynamic, parametric (DC) and ext. synch/tach inputs with multiple frequencies. | |
|
Player |
Visualize, listen, playback on output or generate signals for post-analysis purpose. Based on recorded or imported time domain signal file. | |
| Shared resources |
Filters |
High/low pass, Band/Stop pass, single and double integrator, differentiator, A and C acoustic laws |
|
Events |
Edge detection, DC levels, Delta DC levels, RPM, Delta RPM, Manual, Time period, combinations. | |
|
Weighting windows |
Programmable Force and response, Hanning, Hamming, Kaiser Bessel, flat-top, uniform. | |
|
Tachometers |
Compute RPM from ext. sync and input pulses, DC, CAN. Fractional, simulated and combined tach. | |
| Operational tools |
Transducers management |
Automatic calibration, database management, calibration history, automatic setup of inputs, TEDS management. |
|
Masks |
Mask editor for spectra, profiles, 1/n octave, order spectra | |
|
Report |
On-line report editor, automated report generation, word or Excel files. | |
| Automation tools | Macros, sequence from Excel® sheet, alarms based on mask comparison, customizable control panel, restricted user profiles, remote controller interface. | |
| General purpose analysis |
Monitor |
4 channels FFT analyzer with input hot swap. Statistical extraction (RMS, Max, Min, Kurtosis) from time domain with programmable band-pass filter. |
|
Waterfall |
Synchronized stack for 2D (spectra) and scalar (order, overall). 3D, color map and profiles displays. Extraction capabilities. |
NVGate® Plug-ins analyzers
In addition to the standard functions featured in the software platform, NVGate® can receive additional plug-in analyzers that offer flexible configuration of independent analysis modes.
| FFT | Fast Fourier Transform - Time to Frequency conversion with multiple average domains, combinable trigger, zooms and cross functions. | General-purpose frequency analysis, machinery signature, modal analysis acquisition (hammer or shaker), machinery diagnostic. |
| FFT Add-ons | ||
| CBT | Constant Band Tracking - Order extraction at constant bandwidth | Gears mesh analysis, gearboxes noise and vibration tracking. |
| FFTDiag | Cepstrum, Auto and cross correlation, DC, Min/Max, Pk, pk/pk and crest factor. | Set of functions dedicated to the diagnostics of industrial machineries. |
| TDA | Time Domain Analysis –Time view (oscilloscope). True statistical extraction, averaging. | Machinery diagnostic, long term acquisition monitoring, critical acquisition control, large structure damping control, shocks determination, machinery health control, trend analysis. |
| SOA | Synchronous Order Analysis - Time to Order re-sampling with angle or order averaging, acoustic weightings, multiple tach management. | Rotating machinery balancing. In vehicle order to noise correlation R&D. Pump, compressors, turbines and speed reducer/multiplier test. |
| SOADiag (SOA Add-on) |
Copstrum™, Auto and cross correlation, Revolution synchronous statistics, Order transmission Function (ORF™), X functions | Set of diagnostic functions based on the synchronous order analysis for rotating part transmission and forced vibration extraction. |
| OCT | 1/n Octave Constant Percentage Band filters - 1/n octave detectors set with multiple averaging modes. | General-purpose industrial noise analysis. Vehicle acoustics R&D. Noise test. |
| OVA | Overall Acoustics Detectors - 3 detectors + 1 peak detection per channel with parallel averaging and acoustic weightings. | Industrial acoustic, sound power measurements. Machinery with cycles, R&D and test. |
NVGate® Options
Beside the plug-ins analyzers and their add-on, the 3-Series analyzers software also features options:
| IVC | Instantaneous angular velocity converter | Torsional measurements from Ext. Synch inputs |
| CTE | Combined Tachometer editor | Tachometer math editor - 2 inputs, 1 output |
| VIN | Virtual Inputs | Real-time math combination of dynamic inputs |
| VDC | Virtual DC | Real-time math combination of parametric inputs |
| A-Samp | Angular sampling for SOA | Real-time Angular sampling of inputs |
Signal sources
NVGate®/OROS 3-Series multi-analyzers platform can process signal coming from different sources. These sources are detailed in this section as modules.
Front-end
The front-end module gathers the different input and output settings available in the instrument unit. In addition, the front-end module generates virtual signals (synthesized) when running the office mode (no unit connected to the PC) which is useful for set-up.
Front-end settings
| Dynamic inputs | Sampling clock | 102.4 kS/s to 2,048 S/s or 65.536 kS/s to 3,200 S/s |
| LEMO2 connectors management | 200 V polarization on/off per block of 8 input | |
| Coupling3,4 | AC (0.35 Hz) - DC - ICP - ICP + TEDS - AC float - DC float - Grounded | |
| Node information3 | Label - component - node - direction (± X ,Y,Z) - type (translation, rotation) | |
| Physical quantity3,4 | Any physical quantity can independently be associated to inputs. | |
| Sensitivity3,4 | User defined in V/unit. | |
| Range2 | Pk to pk expressed in the associated unit, (taking in account sensitivity) - linear or dB | |
| External conditioner compensation3 | Gain - polarity - offset. | |
| Filter3 | Any NVGate filter can independently be applied to each dynamic input (See Filters §) | |
| Auto-range | Enable/disable auto-ranging independently on any input | |
| Ext. sync inputs | Sampling | over-sampled 64 time the dynamic inputs sampling |
| Coupling3 | AC (0.35 Hz) - DC | |
| Information3 | Label | |
| Physical quantity3,4 | Any physical quantity can be associated to inputs. | |
| Sensitivity3,4 | User defined in V/unit. | |
| Range3 | Pk to pk expressed in the associated unit, (taking in account sensitivity) - linear or dB | |
| External conditioner compensation3 | Gain, offset. | |
| Edge detection3 | Threshold (in associated unit) - Edge (rise, fall) - Hystersis - hold off (sec) | |
| Pre-divider3 | Hardware - 1 to 255 pulses – accept up to 375 kpulses/sec | |
| Post-multiplier3 | 1 to 50 pulses/trigger - Generate higher frequencies on low rate triggers. (ex. GPS) | |
| Tachometer mode3 | Pulse per rev: 0.5 to 4096 - average (n rev) - min (detect stopped shaft) and max RPM speed - hold off (in % of revolution) - rotation (clockwise/counterclockwise) | |
| Torsional mode2: Instantaneous angular velocity converter | Pulse per rev: 1 to 4096 - min (detect stopped shaft) and max RPM speed - sliding average (1 to 20 samples) - Missing pulse number: 0 to 5, Missing pulses detection :1 to ±20%: of previous pulses duration- Filters (dt, dt², 1/dt) | |
| Angular sampling2: multi-pulse/rev clock used for signal sampling | for SOA - Pulse per rev: 1 to 4096 continuously (no power of 2 limitation) - Real time, in line anti-aliasing - Missing pulse number: 0 to 5, Missing pulses detection: 1 to ±20% of previous pulses duration – Phase reference: Any tachometer including same input |
| Outputs | Sampling | Same as dynamic inputs |
| Generated signals3 | Any outputs signals, see §outputs - play-back of signal file tracks - DC levels - Inputs playback (Delay > 256 samples) | |
| Filters3 | Any NVGate filter can independently be applied to each dynamic output (See Filters §) | |
| Impedance3 | 50 ohm, 600 ohm (only OR36 and 0R38) or grounded | |
| Gain3 | -100 dB to + 120 dB | |
| Synchronization3 | Free run or linked to acquisitions runs | |
| Level and phase transition3 | No (Steps) - controlled (ramp) - user selectable ramp time | |
| Clipping | User selectable - protects shaker and amplifier. | |
| Events (can trig analysis or record)3 | Outputs stabilized - new step reached - start & stop sweep | |
| Controls | Emergency stop - mute/un-mute all | |
| Parametric1(DC) inputs | Sampling | 12.3 to 12,8 S/s - 10 Hz to 100 Hz harmonics rejection |
| Information3 | Label | |
| Physical quantity3,4 | Any physical quantity can be associated to inputs. | |
| Sensitivity3,4 | User defined in V/unit. | |
| Range3 | Pk to pk expressed in the associated unit (taking in account sensitivity) - linear or dB | |
| External conditioner compensation3 | Gain (-120 dB to +20 dB) - polarity - offset (< range). | |
| Auto-range | Enable/disable auto-ranging independently on any input | |
| Auto-ranging | Type | Normal - on Peak detection |
| Margin | Select the first highest range with 0 dB - 3 dB or 20 dB margin | |
| Duration (apply for normal auto-range) | 0 to 10 sec. | |
| Peak detection | User select input were to detect peak, auto-range applies on all enabled input at each peak detection. | |
| Peak parameters settings | 1 to 10 peaks - sensitivity (low, normal, high) - rise, fall or any edge. | |
| Checking | ICP (check not available on OR34) | Test and report (Open, shortcut, ok) all enabled inputs. |
| TEDS | Transducers automatic recognition - Complies with IEEE 1451.4 2004 Rev. 1.0 |
2: Optional features
3: Independent for each input
4: Linked with the transducer database
Front-end results & connections
The following results are available for monitoring and connection to analysis mode (plug-in analyzers)
| Dynamic inputs & torsional1 inputs | Monitoring3 | Time domain instantaneous signal - Size 256 samples |
| Status led3 (docking tool bar) | Overloaded = red - overload occurred since last start = red with yellow center - ok = green - under load (20 dB below range) = green with yellow center | |
| Connection3 | To any: plug-in analyzer channel, monitor channel, Virtual inputs, recorder track, edge event detector & tachometer | |
| Ext. Sync inputs | Monitoring3 | Time domain instantaneous status (1 = threshold crossed, 0 = no event) - Size 256 samples. |
| Connection3 | To any: start or stop averaging of plug-in analyzers, recorder start or stop recording, waterfall start or stop acquisition, new block trigger for FFT and SOA and new slice for waterfall acquisition. To torsional, tachometer & angular sampling | |
| Parametric1 (DC) inputs & CAN1parameters | Monitoring3 | Profiles versus time (160 ms to 163 sec user selectable), and digital/analog view meter. |
| Status led3 | Overloaded = red - ok = yellow - under load (20 dB below range) = Cyan | |
| Connection3 | To any: recorder track, waterfall reference (Z/X axis) and profiles, level delta level detectors and virtual DC |
Recorder / Player
OROS 3-Series/NVGate instruments feature a recorder and a player module that allows users to:
- Record time domain signal, torsional inputs, trigger and parametric input.
- Export or import time domain files.
- Playback time domain files on analyzers outputs during analysis
- Listen to recorded tracks on the PC speakers.
- Post-analyze time domain files using the available plugs-in.
Recorder
The recorder module saves time domain signal into files located on 3-Series analyzer HD, Mobi-DiskTM or PC HD. This is available on 2 different modes:
- On-line record, the chosen inputs (Dynamic, ext. sync, parametric) are recorded at selected sampling frequency during acquisition. Real-time analysis is available simultaneously.
- Time and tracks split, the chosen recorded tracks (from signal file) are played back in the recorder using the post-analysis mode. The sampling frequency, duration, and/or track arrangement can be changed.
Recorder settings
| Bandwidths | Dynamics inputs | 2 groups of user selectable sampling frequency - From 102.4 kS/s to 2.048 S/s (40 kHz to 800 mHz) - available simultaneously |
| Ext. sync inputs | Automatic selection at Front-end sampling frequency - Resolution is 64 time Front-end sampling frequency | |
| Parametric (DC) inputs | 12.5 S/s (50 Hz rejection) - 15 S/s (60 Hz rejection) | |
| Tracks | Number | 14 tracks<ref>For OR34, OR35 and Office-8 licenses.</ref> (8 + 6 ext. sync) or 38 tracks<ref>For OR36, OR38 and Office licenses.</ref> (32 + 6 ext. Sync) Sum of connected licenses using multiple hardware |
| Saved settings / track | Label - Coupling - External gain - Input range - Sampling frequency and signal bandwidth - Component - Node number - Direction - Type - Associated transducer - Unit - Sensitivity and Offset compensation. | |
| Modes | Start to time | Start recording on run or any activated event - Stop recording when duration ends - Duration 10 ms to available space on target HDD. |
| Start to stop | Start recording on run or any activated event - Stop recording on stop on any activated event - Start and stop event can be the same - Duration 10 ms to available space on active drive (PC or OR3x). | |
| Time to stop | Memorize the earliest x seconds - Stop = stop or any activated event - Duration 10 ms to 2 GSamples (limited by the drive available space) | |
| Triggering | Start recording (new record) | Any NVGate® event plus manual and free run |
| Stop recording (end current record) | Any NVGate® event plus manual and free run | |
| Start delay | Positive = unlimited - negative = 128 kSamples | |
| Stop delay | Positive = unlimited - negative = 0 | |
| Markers | Saved in the record files | Added by tool bar or shortcut - comment fields editable during record or at end of acquisition |
| Signal file | Record on PC HDD | Up to 10 dynamic inputs – Up to 4 parametric inputs - max total bandwidth 512 kS/s - (2 MB/s) |
| Record on Analyzer SSD | Up to 40 channels (32 inputs + 6 ext. sync or DC)/instruments - max bandwidth 3.2 MS/s (12.5 MB/s) | |
| Format | Normal: 32 bits/sample - Compressed 16 bits/sample |
Recorder settings (continued)
| Management | Download | Discard Analyzer SSD on PC HDD - Batch download available - Rate 4 MB/s |
| Upload | Load PC HDD records on the analyzer SSD - Rate 1.4 MB/s | |
| Location | All records accessible from the project manager tree | |
| Hard drive management | Format SSD - Selective delete - Sorting tools |
Mobi-DiskTM
OR36 Mobi-Pack and OR38 multi analyzers/recorders feature a removable hard drive with 2 ports:
- Parallel High speed port for direct data throughput to the Mobi-DiskTM.
- USB 2.0 port for post processing and data management without the instrument.
| Connection | 1 to 8 Mobi-DiscTM | Up to 8 Mobi-disc connected - Active Mobi-Disc: 1 (user selectable) - hot swap |
| Transfer | Based on the USB 3.0 link | Download 15 MB/s |
Recorder monitoring
The following displays are available during real-time or post-analysis.
| RMS | Overall RMS / input | Digital or analog view-meter |
| Signal | Real-time | Compressed view of entire recorded signals - Automatic update of time axis. |
Player
The player module plays the recorded signal files. This is done one of the following two ways:
- Post-analysis, the player tracks take place of the corresponding inputs (Dynamics, Ext. Sync and parametric) to be processed by the plug-in analyzers, recorder, trigger and tachometer
- Playbacks, the recorded dynamic input are generated on the instrument outputs simultaneously with standard analysis of the inputs.
Player settings
| Played section | File selection | NVGate® recorded files - Imported files - located on instrument SSD, Mobi-DsicTM or on PC HDD. |
| Record selection | Record number selection (for multi record files) | |
| Section definition | User selectable Start and stop offsets (in sec.) - available in the file overview window (marker and slider) | |
| Duration | Play backed duration (User information) | |
| Repeat | On/off - repeat continuously the selection (available only for playback on analyzer output) | |
| Mode | File swap | Swap loaded files with same tracks number - applies identical post-analysis setup to multiple files. |
| Playback | Continuous or step by step (5 ms to 360,000 s) | |
| Bandwidth | All tracks at lowest frequency (compatible with all plugs-in) or initial record frequencies (no track mix in plugs-in) | |
| Tracks | Number | Up to 352 according to user's fleet |
| Type | Dynamic input record (2 sampling frequencies), parametric (DC) input record and ext. sync record. | |
| Fixed setting (information) / track | Label, Coupling, external gain, input range, sampling frequency and signal bandwidth | |
| Modifiable measurement point information settings (apply for post analysis or re-recording) / track | Component - node number - direction - type | |
| Modifiable settings (apply for post analysis or re-recording) / track | Associated transducer - unit - sensitivity - offset compensation |
Player settings (continued)
| Listening | File location | Analyzer HD - Mobi-DiskTM connected with USB or inside the analyzer - PC HD |
| Playback | One track - from cursor position - repeat displayed signal | |
| Markers | Display | Recorded markers are available in the file overview |
| Use | Set the start and stop playback offset (user selectable) |
Player connections
The following table describes the available connections to the analysis modes (plug-in analyzers and recorder) during post-analysis operation:
| Dynamic inputs & torsional Tracks | Preview (multiple file simultaneously) | Entire file fast overview (pre-compressed at recording time) - Track contents preview, independently (multi-graph display) |
| Monitoring (loaded file only) | Zoom on selected play-back section | |
| Connection3 (loaded file only) | To any: plug-in analyzer channel, monitor channel, recorder track, edge event detector and tachometer | |
| Ext. sync Tracks | Preview (multiple file simultaneously) | Entire file fast overview (pre-compressed at recording time) - Track contents preview, independently (multi-graph display) |
| Monitoring (loaded file only) | Zoom on selected play-back section | |
| Connection3 (loaded file only) | To any: start or stop averaging of plug-in analyzers, recorder start or stop recording, waterfall start or stop acquisition, new block trigger for FFT and SOA and new slice for waterfall acquisition. To torsional, tachometer & angular sampling | |
| Recorded parametric1(DC) inputs & CAN parameters | Preview (multiple file simultaneously) | Entire file fast overview - Track contents preview |
| Monitoring (loaded file only) | Profiles versus time and digital or analog view meter. | |
| Connection3 (loaded file only) | To any: recorder track, waterfall reference (Z/X axis) and profiles, level and delta level events. |
Plug-ins analyzers
The following plug-in analyzers are available as options of NVGate® software platform.
Time Domain Analysis - TDA
The TDA plug-in analyzer provides time domain based analyses and visualizations. This plug-in analyzer computes statistical extractions and data compression of long duration oscilloscope views. All results are real time and operations are possible on-line or in post processing. The TDA plug-ins can operate free run or synchronized with the other plug-in analyzers.
TDA Settings
| Bandwidths | Oscillator 1 | 800 mHz to 40 kHz (sampling oscillator 102.4 kS/s to 2,048 S/s) |
| Oscillator 2 | 512 mHz to 25.6 kHz (sampling oscillator 65.536 kS/s to 3,277 S/s) | |
| Time views | Depth | 7200/ABW ABW: the plug-in Analysis Bandwidth. sec to 100 000 sec (27 hours) - Independent on each channel |
| Time base (resolution) | Depth/2048- Independent on each channel | |
| Time span for extraction (averaging) |
Type | Continuous sliding with refresh each 256 samples (Exponential) - One shot (Linear) - Repeated shot (Repeated linear) |
| Duration | 1/ABW to 2 106/ABW (ex: 50 ms to 1000 sec @ 2 kHz) | |
| Channels | OR36 & OR38 analyzers | 32 channels per plug-in for on line 32 to 256 in post-analysis |
| OR34 & OR35 analyzers | 8 channels per plug-in for on line and post-analysis | |
| Filters | On each channel | Any NVGate filter can independently be applied to each dynamic input (See Filters §) |
| Triggering |
Start analysis | Any NVGate® event plus manual and free run |
| End analysis | Any NVGate® event plus manual and free run | |
| Repeat analysis | On new start or end of averaging | |
| Trigger delay | Positive = unlimited - negative = 32k Samples |
TDA Results
The following results are available for real time or post-analysis display, report and saving.
| Time Views | Overview | Signal envelope: Min/Max line for each time step - |
| Statistical values | DC - RMS - Min- Max - Peak - Peak to Peak - Crest factor - Skewness - Kurtosis - computed on a user defined area of the time view | |
| Extractions | Statistical values | DC - RMS - Min- Max - Peak - Peak to Peak - Crest factor - Kurtosis - computed on the Time span – All values available for View-meter and/or Waterfall profiles |
Fast Fourier Transform analysis - FFT
The FFT plug-in analyzer features multiple vibrations results depending on applied setting. This type of plug-in analyzers computes real-time (on-line or post-processing) Fast Fourier Transform algorithms with multiple averaging domain and trigger capabilities. Up to 4 FFT plug-ins can operate at the same time.
FFT Settings
| Bandwidths | Oscillator 1 | 800 mHz to 40 kHz (sampling oscillator 102.4 kS/s to 2,048 S/s) |
| Oscillator 2 | 512 mHz to 25.6 kHz (sampling oscillator 65.536 kS/s to 3,277 S/s) | |
| Resolution | Lines | 101, 201, 401, 801, 1601, 3201, 6401, 12801<ref>With force DSP</ref> and 25601 lines |
| Frequency resolution | 80 µHz (512 mHz/6401 lines) to 400 Hz (40 kHz/101 lines) | |
| Averaging | Domain | Spectral (power) - time (with phase) - FDSA (Synchronized with one frequency) |
| Type | Exponential - linear - repeated linear - referenced peak hold (eq. to tracking filter locked on reference channel frequency) - peak hold | |
| Size | Duration or number of blocks, unlimited size | |
| Overlap | 0% to 99.9% depending on block size - retrigger | |
| Channels | OR36, MP & OR38 analyzers | 32 to 256 ch. per plug-in for on line and post-analysis |
| OR34 & OR35 analyzers | 8 channels per plug-in for on line and post-analysis | |
| Weighting | General | Uniform - Hanning - Hamming - Kaiser Bessel |
| Modal acquisition | User defined Force (rect.) and Response (Rect. + exp) | |
| Assignment | Independently on any channels | |
| Filters | On each channel | Any NVGate filter can independently be applied to each dynamic input (See Filters §) |
| Cross functions | Reference selection | Full or partial matrix available (all channels can be references) |
| Zoom | Magnification factor | 2 to 128 by step power of 2 |
| Min., max and center frequencies | Graphically selectable on wide band spectrum | |
| Triggering | Start averaging | Any NVGate® event plus manual and free run |
| End averaging | Any NVGate® event plus manual and free run | |
| New block | Any NVGate® event plus manual and free run | |
| Repeat averaging | On new start or end of averaging | |
| Trigger delay | Positive = unlimited - negative = 32k Samples | |
| Automatic | Reject overloaded blocks | |
| Blocks rejection Overall |
Manual | Accept or Reject after preview of averaged results (FRF, Coherence) |
| Normal | Accept all blocks | |
| Overall | Detector | Quadratic sum of spectra lines taking in account weighting window equivalent noise bandwidth |
| Lower and upper frequencies | Selectable into the current FFT bandwidth |
FFT Results
The following results are available for real time or post-analysis display, report and saving.
| Time averaging | Time domain | Filtered signal - Triggered block - Averaged Triggered block - Weighted Block - Lissajoux of triggered blocks |
| Spectra | Complex spectra | |
| Cross-functions | Instantaneous cross-spectra - averaged cross-spectra - FRF H1 - FRF H2 - Coherence | |
| Overall | Overall RMS value in specified band - Overall RMS profile in specified band. | |
| Spectral averaging | Time domain | Filtered signal - Triggered block - Weighted Block - Lissajous of triggered blocks |
| Spectra | Instantaneous complex spectra - averaged power spectra | |
| Zoomed spectra | Zoomed instantaneous complex spectra - zoomed averaged power spectra | |
| Cross-functions | Instantaneous cross-spectra - averaged cross-spectra - FRF H1 - FRF H2 - Coherence | |
| Zoomed cross-function | Instantaneous zoomed cross-spectra - averaged zoomed cross-spectra - zoomed FRF H1 - zoomed FRF H2 - zoomed Coherence | |
| Overall | Overall RMS value in specified band - Overall RMS profile in specified band. | |
| Synchronous averaging on one frequency (FDSA) | Time domain | Filtered signal - Triggered block - Averaged Triggered block - Weighted Block - Lissajous of triggered blocks |
| Spectra | Instantaneous complex spectra - time domain averaged power spectra | |
| Overall | Overall RMS value in specified band - Overall RMS profile in specified band. |
Constant Band Order Tracking Add-on (CBT)
Constant band order tracking is an optional add-on to the FFT plug-in analyzers. This add-on computes spectrum lines power related to RPM speed. This option adds settings and results to the FFT Plug-ins. Constant band tracking can operate on up to 4 different tachometers at the same time.
CBT Settings
| Tracked Order | Number | 8 per channels |
| Max | 0.001 to 800 | |
| Constant bandwidth | User selectable per channel - minimum depend on weighting windows | |
| Computation | Associated tachometer | Any front end, recorded or virtual tachometer |
| Peak tracking | On/Off center bandwidth on nearest peak | |
| Order amplitude | Weighting windows eq. noise bandwidth correction |
CBT Results
The following results are available for real time or post-analysis display, report and saving.
| Scalar | Tracked order | Digital (magnitude and phase) or analog view-meter |
| Cross phase tracking | Order phases are relative to the same order from a ref. channel | |
| Overall | Digital or analog view-meter | |
| Monitoring | Continuous profiles of tracked order | Profiles vs. time - profiles vs. RPM - max depth 2048 pts - user selectable delta time - user selectable delta RPM |
| Profiles | One shot acquisition | Tracked order (complex), cross phase orders and overall level can be collected by the waterfall profiles. |
| References | Time, RPM and DC levels |
Diagnostic Add-on (FFTDiag)
FFT Diagnostic is an optional add-on to the FFT plug-in analyzers. This add-on computes a set of useful analysis for machinery diagnostic. Up to 4 FFTDiag can operate on 4 different FFT plug-ins at the same time.
This option adds settings and results to the FFT Plug-ins.
FFTDiag Settings
| Envelop demodulation | Activation | Enable/disable on all channels - requires zoom activation |
| Averaging | Spectral domain - FDSA | |
| Bandwidth | ½ of zoom span - ¼ of FFT bandwidth | |
| Correlation | Activation | Enable/disable on all channels - All other FFT results are affected |
| Weighting window | Uniform - Left zero padding - Centred zero padding |
FFTDiag Results
The following results are available for real time or post-analysis display, report and saving.
| Scalar | Min/Max | Minimum and maximum amplitude per trigger block |
| Peak detectors | Peak level - Peak to Peak level - Crest Factor - per trigger block | |
| Others | Cepstrum | Cepstrum - Zoomed cepstrum |
| Correlation | Auto-correlation block - Cross correlation block | |
| Shaft view | Time domain signal on first rotation - angular representation |
Synchronous Order Analysis (SOA)
The SOA plug-in analyzer features several results depending on applied settings. Up to 2 SOA plug-ins can operate in parallel.
SOA Settings
| Bandwidths | Order span | 6.25 to 400 – up to 800 with ForceDSP |
| Frequency bandwidth | Up to 40 kHz | |
| RPM span | Up to 384 000 RPM - Ratio of 64 between Min & Max RPM | |
| Resolution | Lines | 101 - 201 - 401 – 801 – 1601 with ForceDSP |
| Order resolution | 1 - ½ - ¼ - 1/8 - 1/16 - 1/32 | |
| Averaging | Domain | Spectral (power) - revolution (re-sampled blocs) |
| Type | Exponential - linear - repeated linear - peak hold | |
| Size | Number of blocks, unlimited size | |
| Overlap | 0 to 31 revolutions depending on resolution – 0 to 359° into revolution – Retrigger on multi-pulse/rev | |
| Tachometer | Computation base | Any NVGate'® 'tachometer (ext. sync, regular input, DC input, CAN, simulated, Fractional, and combined tach.) |
| Phase reference | Tachometer pulse edge or pulse center requires to analyze the tachometer input | |
| 0° Phase reference | Cosine or sine | |
| RPM | Max speed variation | 1 to 99% per analyzed block - blocks with higher variation are rejected. No control (set @ 100%) |
| RPM range | User selectable max & min RPM, under and over speed blocks are rejected | |
| Tracked order | Number | Up to 8 per channels |
| Min-Max | 1/32 to 400 – up to 800 with ForceDSP | |
| Cross phase tracking | Order phases are relative to the same order from a ref. channel | |
| Channels | OR36 & OR38 analyzers | 32 channels per plug-in for on line - 32 to 256 in post-analysis |
| OR34 & OR35 analyzers | 8 channels per plug-in for on line and post-analysis | |
| Weighting | Windows selection | Uniform - Hanning - Hamming - Kaiser Bessel Applied independently on any channels |
| Filters | On each channel | Any NVGate filter can independently be applied to each dynamic input (See Filters §) |
| Triggering | Start averaging | Any NVGate® event plus manual and free run |
| End averaging | Any NVGate® event plus manual and free run | |
| New block | Any NVGate® event plus manual and free run | |
| Repeat averaging | On new start or end of averaging | |
| Trigger delay | Positive = unlimited - negative = 1/order res revolution | |
| Trigger block phase shift | ±720° - independent for each channel | |
| Overall | Detector | Quadratic sum of order spectra lines taking in account weighting window equivalent noise bandwidth |
| Lower and upper orders | Selectable into order span - from 0,03125 to 800 with ForceDSP |
SOA Results
The following results are available for real time or post-analysis display, report and saving.
| Revolution averaging | Time domain | Filtered signal |
| Angle domain (Revolution) | Triggered block - Averaged Triggered block - Weighted block | |
| Order spectra | Complex spectra | |
| Tracked orders | Digital (magnitude & phase) view-meter - Analog view -meter | |
| Overall | Overall RMS value in specified order band (digital or analog view-meter) | |
| Spectral (order) averaging | Time domain | Filtered signal |
| Angle domain (Revolution) | Triggered block - Weighted Block | |
| Order spectra | Instantaneous complex order spectra - averaged power order spectra | |
| Tracked orders | Digital (module and phase) and/or Analog view-meter. | |
| Overall | Overall RMS value in specified order band (digital or analog view-meter) |
Diagnostic Add-on (SOADiag)
Order based Diagnostic is an optional add-on to the SOA plug-in analyzers. This add-on computes a set of useful synchronous order transmission extraction tools and analyses. Up to 2 SOADiag can operate on 2 different SOA plug-in at the same time.
This option adds settings and results to the SOA Plug-ins.
SOADiag Settings
| Cross-functions | Reference selection | Full or partial matrix available (all channels can be references) - order domain averaging only. |
| Angular Correlation | Activation | Enable/disable on all channels - All other SOA results are affected simultaneously |
| Weighting window | Uniform - Left zero padding - Centred zero padding |
SOADiag Results
The following results are available for real time or post-analysis display, report and saving.
| Rev. synchronous Scalars | Min/Max | Minimum and maximum amplitude per trigger block (n rev.) |
| RMS, DC | Per trigger block (n rev.) | |
| Peak detectors | Peak level - Peak to Peak level - Crest Factor - per trigger block (n rev.) | |
| Others | Copstrum™ | Cepstrum of the order spectra |
| Cross-functions | Instantaneous order cross-spectra - averaged order cross-spectra - ORF™ H1 / H2 -Coherence – angular or order domain averaging. | |
| Angular Correlation | Auto-correlation block - Cross correlation block - angular averaged | |
| Re-sampled Shaft view | Time domain signal on first rotation – angular representation - instantaneous or revolutions averaged |
1/n octave constant percentage band filter analysis - OCT
The OCT plug-in analyzer features multiple acoustic results depending on applied setting. This plug-in analyzer computes real-time signal (on-line or post-processing analysis) based on digital filters (CPB) and detectors.
OCT Settings
| Bandwidths | Sampling oscillator #1 (102.4 kS/s to 2,048 S/s) |
Center of highest 1/3rd band = 40 kHz Center of lowest 1/3rd band = 100 mHz |
| Sampling oscillator #2 (65.536 kS/s to 3,277 S/s) |
Center of highest 1/3rd band = 25 kHz Center of lowest 1/3rd band = 100 mHz | |
| Frequency span | Highest Band / lowest band < 2000 (ex. 10Hz - 20kHz) | |
| Resolution | 1/n Octave | '1, 1/3 'rd, 1/12th, 1/24th |
| Averaging | Basic | Linear & repeated linear (20 ms to 60,000 s) exponential (20 ms to 60s) |
| Acoustics | Short LEQ 1 s, Short LEQ 1/8 s, Fast, Slow, Impulse | |
| Constant Bandwidth * Time | B*T = 0.2dB, 0.5 dB, 1 dB, 2 dB | |
| Standards | Detectors | Complies with IEC 651, IEC 804, ANSI/ASA S1.4-2014 / Part 1 / IEC 61672-1:2013 class 1 |
| CPB filters | Complies with IEC ANSI/ASA S1.11-2014 / Part 1 / IEC 61260:1-2014 and IEC 1260 class 1 |
| Channels | OR36 & OR38 analyzers | 32 channels per plug-in for on line - 32 to 256 in post-analysis |
| OR34 & OR35 analyzers | 8 channels for on line and post-analysis | |
| Triggering | Start averaging | Any NVGate® event plus manual and free run |
| End averaging | Any NVGate® event plus manual and free run | |
| Repeat averaging | On new start or end of averaging | |
| Overall | Detectors | 2 parallel overall detectors linear and weighted (time domain) |
| Weighting | A, C, or Z (none) applicable in 10 kHz - 40 kHz bandwidth |
OCT Results
The following results are available for real time or post-analysis display, report and saving.
| Spectra | 1/n Octave spectra | Instantaneous spectra, averaged spectra |
| Holden spectra | Minimum & maximum spectra | |
| Overall | Linear | Digital & analog view meter of time domain overall detector, exact bandwidth is informed |
| Weighted | Digital & analog view meter of A or C weighted overall levels computed in time domain, exact bandwidth is informed |
Overall acoustics sound level meter - OVA
The OVA plug-in analyzer features class sound pressure level measurement according to IEC 61672:2013 standard. This plug-in analyzer computes real-time signal (on-line or post-processing analysis) based on digital filters and detectors.
OVA Settings
| Type | Standard | IEC 61672-1:2013 - IEC 651 - IEC 804 |
| Class | 1 | |
| Bandwidths | 10 Hz to 40 kHz - Adjustable | |
| Channels | OR36 & OR38 analyzers | 32 channels per plug-in for on line - 32 to 256 in post-analysis |
| OR34 & OR35 analyzers | 8 channels for on line and post-analysis | |
| Averaging | Linear | User selectable duration - repeat mode |
| Short leq | 1/8 s - 1 s - User selectable duration | |
| Triggering | Start averaging | Any NVGate® event plus manual and free run |
| End averaging | Any NVGate® event plus manual and free run | |
| Repeat averaging | On new start or end of averaging | |
| Detectors | Peak | 1 peak detector/Ch. - A, C or Z (none) weighting -Independent for each channel |
| Weighting | 3 overall detectors/Ch. - A, C or Z (none) weighting - Fast, Slow, Impulse and linear time weighting - Independent for each channel |
OVA Results
The following results are available for real time or post-analysis display, report and saving. The following levels can be tracked in profiles up to 100 000 pts. each.
| SPL | Time weighted | Instant - max hold - min Hold |
| Averaged | Short leq - leq | |
| Peak | Peak - Time weighted - max hold min hold |
Options
Instantaneous angular Velocity Converter (IVC)
The IVC option converts frequency to voltage from the External synch inputs. It covers torsional and acyclism measurements. The converted signals are made available as standard inputs (or player tracks). This option operates real-time computation and operations are possible on-line or in post processing.
IVC Settings & specs
| Rate | Pulse/rev | 0.5 to 4096 - Up to 1 E6 with pre-divider |
| Pulse/rev Frequency | > 40 kpulse/sec max | |
| Pre-divider | 1 to 255 - hardware decimation (pulse are not measured) | |
| Pre-divider frequency | 375 kpulse/sec max. | |
| Missing pulses | Number | 0 to 5 consecutive pulses integer or fractional |
| Hold off | 2 consecutive pulses | |
| Generated signal | '1st 'order interpolation | |
| Tach. phase ref | No missing pulse | First random - continuous offset further |
| missing pulse > 0 | Last known edge before missing pulse | |
| Resolution | Time | 160 ns : 1/(SF x 64) |
| Angular (with SOA) | 350 µRad (20 mdegres) @ 8000 RPM, up to order 10 | |
| Pre-processing | Smoothing | Sliding average - 1 to 32 samples |
| Filtering | Any NVGate filter (See Filters §) incl. dt and 1/dt | |
| Max Speed | Without pre-divider | Max RPM = 2.4 e6/Pulse per rev - 12 000 RPM @ 200 pulse/rev |
| With pre-divider | Max RPM = 36 e6/Pulse per rev - 12 000 RPM @ 200 pulse/rev |
IVC Results
The following results are available for real time or post-analysis.
| Signals | Number | 1 to 6 (depends on the number of available ext. synch) |
| Use | Same as dynamic inputs or recorded dynamic inputs | |
| Magnitude | Torsional acceleration, velocity & angle – separated from angular magnitudes (RPM) | |
| View | Type | Signal - filtered signal - 256 samples frame |
Angular sampling (A-Samp)
The angular sampling option allows accurately localizing the order phenomenon angle on cyclic rotating machineries. It uses the pulses delivered by an encoder (or zebra tape or gear teeth) to resample the inputs and torsional signal in the SOA plug-in. This option operates real-time computation and operations are possible on-line or in post processing.
IVC Settings & specs
See front-end/ext. Synch § for details
Virtual inputs (VIn)
The virtual input allows combining front end inputs with polynomial operations to generate a signal (new input). This option covers numerous applications such as vector strain calculation with rosette or dynamic twist measurement on machinery transmission. The virtual inputs are made available as standard dynamic input. A static twist computation based on phase comparison is also available with the Vin + IVC options.
This option operates real-time computation on raw or recorded signal.
VIn Settings
| Output | Number | 12 Operators |
| Type | New item in the active inputs/tracks list | |
| Synchronization | 0° phase shift with sources and analyzed signal | |
| Magnitude | Automatic or voltage if unresolved | |
| Sources | Number | 1 to 32 channels |
| Type | Analyzer dynamic inputs or recorded dynamic inputs | |
| Output adjustment | Type | (Input * Coeff + Offset ) ^power - independent on each output |
| Offset | Any real value from -1 e9 to 1 e9 - ex: -5.67 | |
| Coefficient | Any real value from -1 e9 to 1 e9 - ex: 12 | |
| Power | Any real value from -4 to 4 - ex: 0.5 | |
| Sources adjustment | Type | Filtering [ (input * Coeff + Offset ) ^ power] - independent for each source |
| Offset | Any real value from -1 e9 to 1 e9 - ex: -5.67 e-5 | |
| Coefficient | Any real value from -1 e9 to 1 e9 - ex: 1200 | |
| Power | Any real value from -4 to 4 - ex: -2.4567 | |
| Filtering | Any NVGate filter | |
| Operators | Type | Product - Sum - independent on each operator |
| Twist | Type | Phase comparison – output in plane angle |
| Correction (zeroing) offset | -360° to +360° | |
| Output | Plane angle or torque with conversion factor |
Virtual parameter (VDC)
The virtual parameter (VDC) allows combining front-end parametric inputs (DC) with math operations to generate a calculated parameter (new DC). This option covers numerous applications such as averaged temperature or non linear response transducers. The virtual parameters are made available as standard DC input. This option operates real-time computation on raw or recorded signal.
VDC Settings
| Output | Number | 12 Operators |
| Type | New item in the DC inputs/track list | |
| Synchronization | 0° phase shift with sources and analyzed signal | |
| Magnitude | User defined | |
| Sources | Number | 1 to 32 channels |
| Type | Analyzer DC inputs or recorded DC inputs | |
| Editor | Type | Text |
| Variables | Real values | |
| Operators | +, -, x, /, ^, = (affectation) | |
| Predefined | Ch x (Channels signals), Pi, e | |
| Trigonometric functions | Sine, Cosine, Tangent - with Arc and Hyperbolic combination | |
| Logarithmic functions | Log2, Log10, Ln, Exp | |
| Miscellaneous | Sqrt, Abs, Min, Max, Sum, Avg | |
| Output characterization | Limits | Min and max: +/- 1 E9 - In current unit |
| Information | Label (text) |
Combined tachometer editor (CTE)
The CTE option combines 2 actual tachometers with math to generates a calculated angular velocity (new tachometer). It covers various unreachable rotating parts and more specially the CVT gear chain measurements. The combined tachometers are made available as standard tachometer. This option operates real-time computation and operations are possible on-line or post processing.
CTE Settings
| Sources | Number | 2 |
| Type | Any NVGate tachometer – excepted another CTE | |
| Output | Type | New item in the active tachometers list |
| Synchronization | 0° phase shift with sources and analyzed signal | |
| Editor | Type | Text |
| Variables | Real values | |
| Operators | +, -, x, /, ^, = (affectation) | |
| Predefined | Rmp1, Rpm2 (sources speed), Pi, e | |
| Trigonometric functions | Sine, Cosine, Tangent - with Arc and Hyperbolic combination | |
| Logarithmic functions | Log2, Log10, Ln, Exp | |
| Miscellaneous | Sqrt, Abs, Min, Max, Sum, Avg, Sign, If, Rint | |
| Output characterization | Rotation | Clock wise or counter clock wise |
| Average | Sliding - 1 to 256 revolution | |
| Speed limits | Min: 0 RPM - max: 1 200 000 RPM | |
| Information | Label (text) |
CTE Results
The following results are available for real time or post-analysis
| Signals | Number | 4 |
| Use | Same as on-line Tachometer or recorded tachometer | |
| Magnitude | Angular velocity (RPM) | |
| View | Types | View meter - 1 to 100 s rolling profile |
General purpose analysis
The following modules are available as standard features of NVGate® software platform; they feature additional analysis capabilities to regular plug-in analysis modules.
Monitor
The monitor is an independent (dedicated processor) module that continuously processes FFT analysis on 4 channels at the maximum available bandwidth. The aim of this module is to monitor in both domains (time and spectral) 4 inputs and to compute basic indicators for monitoring and triggering purpose.
Monitor settings
| Fixed setup | Bandwidth | ABW = Sampling freq / 2.56 |
| Resolution | 401 lines | |
| Average domain | Spectral (power) | |
| Overlap | 0% | |
| Average type | Exponential | |
| Weighting windows | Hanning | |
| Trigger | Free run | |
| Channels | Number | 4 |
| Swap | Between any active dynamic input - hot swap capable | |
| Average | Duration | Instantaneous (20 ms) to unlimited |
| Overall analysis | Pass band filter | Butterworth order 2 to 10 - IIR type - Bypass function |
| Upper & lower frequency | User defined - can be graphically modified | |
| Computed indicators | DC - Max - Min - RMS - Skew - Kurtosis - Into defined pass band - overall if bypass is on | |
| Average | User defined duration - independent from spectral averaging |
Monitor results and connections
The following results are available for real time or post-analysis display, connection to other modules.
| Time domain | Play back | On any output generator - hot swappable |
| FFT analyzer | Trigger bloc | 1024 samples - time domain analyzed bloc |
| Spectra | Instantaneous complex spectra - averaged power spectra | |
| Overall detectors | Display (digital or analog view-meter) | DC - Max - Min - RMS - Skew - Kurtosis |
| Connection | To level and delta level event detector - to waterfall profiles |
Waterfall
The waterfall module operates as a stack for plug-in analyzers results. Waterfall module features advanced graphics for 3D and profiles, including extraction tools. It can synchronize results coming from multiple plug-in analyzers and sources in one result.
Waterfall settings
| Mode | Continuous | Circular buffer of results |
| One shot | Fill stack and stop waterfall acquisition | |
| Triggering | Start acquisition | Any NVGate® event plus manual and free run |
| Stop acquisition | Any NVGate® event plus manual and free run | |
| New slice (point or spectra) | Any NVGate® event - manual - free run - availability of connected results - periodic |
Waterfall settings (continued)
| Size | Number of result per acquisition | Up to 95 results + Time |
| Depth | 2 to 100,000 slices or points - depend on PC available memory and requested result - automatically adjusted before acquisition | |
| Depth for stand-alone acquisition | Up to 3 MSamples per computation DSP | |
| Channels | Type scalar (the following results are connectable to waterfall channels) | Overall levels (lin and weighted) from OvA and 1/n OCT - Monitor indicators (DC, Max, Min, RMS, Kurtosis) - Orders (from CBT and SOA) - Complex orders (magnitude & phase) - Overall levels in selected BW from FFT & SOA (order or frequency) - TDA scalar: DC, Min/max, RMS, Kurtosis, peak, peak-peak, crest factor |
| Type 2D - FFT (the following results are connectable to waterfall channels) | Triggered block - Averaged Triggered block - Weighted Block - Complex spectra - Power spectra -Cross-spectra - FRF H1 - FRF H2 - Coherence - Zoomed complex spectra - zoomed power spectra | |
| Type 2D - OCT (the following results are connectable to waterfall channels) | Instantaneous spectra - averaged spectra - max & min hold spectra | |
| Type 2D - SOA (the following results are connectable to waterfall channels) | Triggered block - Averaged Triggered block - Weighted block - Complex order spectra - Power order spectra |
Waterfall results
The following results are available for real time or post-analysis display, report and saving. All stacked results can be saved.
| 3D | Display | 1 pane (3D) - 2 panes (3D + YZ view or 3D + XY view) , 3 panes (3D + YZ + XY + Extraction view) windows - automatic or user selectable pane arrangement - Real or imaginary part and module or phase for complex results |
| Z axis (X axis for extraction and YZ view) | Any reference - time - independent for any window - swap reference at any time | |
| Saving selection | Entire 3D data and / or any active section (YZ, XY or Extraction) | |
| Profiles | Display | Profile of any scalar - Real or imaginary part and module or phase for complex results |
| X axis | Any reference - Time – Slice - independent for any window - swap reference at any time |
Waterfall Tools
The following results are available for real time or post-analysis display, report and saving.
| Sections | YZ Sections (Profiles vs. Ref) | Any order/frequency - Power - Peak - on selected bandwidth |
| XY Sections (Spectra) | Any position in the current ref. - Min - Max - Average - on selected range or all slices | |
| Order/Frequency extraction (profiles vs. Ref.) | Any order/frequency extraction - user selectable tach. - Power - Peak - on selectable bandwidth - Max order | |
| Number of sections | Unlimited - available on result or real-time waterfalls | |
| Linked cursors | General | Single or dual cursor in each view - linked with other graphs |
| Linked by value | Linked cursors track the same X value in different windows. | |
| Linked by reference | Linked cursors track the same acquisition slice in different waterfall windows with different X or Z-axis. |
References are: Time - Slice number - DC channels (expressed in physical quantity) - TDA scalars - Monitor levels- any Tachometer
The following resources are available for each plug-in analyzer (when it is compatible). For example once a trigger is activated it can be applied to FFT and SOA: Then modifying the trigger setting in the resources will apply on all corresponding plug-in.
Triggering
Each plug in analyzer (and recorder) can be started, stopped or triggered (new block) with events defined in the Event module.
Event settings
| Edge detector | Source | Any dynamic input - Any recorded dynamic input |
| Label | String for event identification (Ex. "Impact" for a hammer impact detection) | |
| Threshold | Between min and max range - use source unit (ex. g for an accelerometer) | |
| Pre-filtering | A law - C law - any NVGate filter | |
| Slope | Rise - fall | |
| Hold off | 0 to 36000 s | |
| Hystersis | Into source input range - use source unit (ex. g for an accelerometer) | |
| Number | 2 edge detectors | |
| RPM speed detector | Source | Any tachometer - computed from dynamic input or ext.sync - any recorded pulses (through tachometer) |
| Label | String for event identification (Ex. "start speed" for a run up initial triggering) | |
| Threshold | Detection into source tachometer RPM range | |
| Slope | Run up - Run down | |
| Hysteresis | 0 to source max RPM | |
| Interpolation | On interpolate event occurrence into revolution - Off event occur at revolution ends (new pulse) | |
| Number | 2 to 6 RPM speed detector | |
| Delta RPM speed detector | Source | Any tachometer - computed from dynamic input or ext.sync - any recorded pulses (through tachometer) |
| Label | String for event identification (Ex. "Each 100 RPM" for a run up triggering) | |
| Lower velocity | Minimum RPM speed - Events occurs only for higher source speed | |
| Higher velocity | Maximum RPM speed - Events occurs only for lower source speed | |
| Delta velocity | Define velocity step - event occur each time source speed increase or decrease by delta velocity | |
| Slope | Run up - run down - first, first slope is automatically selected - any, event occur on any slope | |
| Interpolation | On, interpolate event occurrence into revolution - Off, event occur at revolution end (new pulse) | |
| Number | 2 to 6 delta RPM speed detector | |
| Level detector | Source | Any parametric (DC) input - Monitor scalar - Filtered monitor scalar (Band Pass) |
| Label | String for event identification (Ex. "temp A" for a recording trigger) | |
| Type | Monitor scalar - DC - RMS - Max - Min - Kurtosis | |
| Status | Above / below - Detection level - available in lin or dB | |
| Number | 1 to 4 level detectors |
Event settings (continued)
| Periodic event | Label | String for event identification (Ex. "Hourly" for 1 hour time interval) |
| Time interval | 2 ms to 11 days - Synchronized with analyzer. | |
| Number | 2 periodic events | |
| Combination | Sources | Any event - 2 different sources defined as A and B |
| Label | String for event identification (Ex. "Time/RPM variation" for a mix between periodic and delta RPM) | |
| Combination | A OR B - A AFTER B - A AND B (occur in the same bloc) | |
| Number | 2 event combination | |
| Plug-in synchronization | FFTx result available | Occurs at each new spectra availability - Occurs at end of linear averaging (repeat and linear) - One event per active FFT plug in (FFT1 to FFT4) |
| OCT result available | Occurs at each new 1/n spectra availability - Occur at end of linear averaging (leq, short leq, linear repeat) | |
| SOAx result available | Occurs at each new spectra availability - Occurs at end of linear averaging (repeat and linear) - One event per active SOA plug in (up to 2) | |
| TDA result available | Occurs at each new level set ( RMS, DC, etc) availability - Occur at end of linear averaging (repeat and linear) | |
| OVA result available | Occurs at each new set of overall level (short LEQ) availability - Occur at end of short averaging (repeat and linear) | |
| Generators Synchronization | Event synchronized with blocks of: | Multi-sine - random noise - chirps |
| Swept sine generator event: | Swept sine stabilized (output amplitude established) - step sine stabilized (occur x sec after step frequency is reached) - pure tone stabilized (output amplitude established) |
Output signals
NVGate® proposes a set of generator signals.
Output signals
The following output signals are available as standard and can be independently applied to the front-end outputs.
| Sine | Type | Pure tone - Swept sine - Step sine |
| Frequency | 100 µHz to 40 kHz - smooth variation between step - resolution 10 µHz | |
| Frequency control | Start & stop frequencies - pause/release during sweep - adjustment during pause - step | |
| Cycle control | One shot - One cycle - continuous sweep between boundaries | |
| Amplitude control | Settling time 100 µs to 10 s - Stabilization time 0 s to 1000 s | |
| Sweep speed | Linear: 300 mHz/s to 20 kH/s - Log: 5 mOct/s to 330 Oct/s | |
| Step control | Synchronized with analysis end - free run | |
| Gain control | -15 dB to +60 dB - Independent for each output - Amplitude variation controlled by settling time (1 ms to 1000 s) | |
| Phase control | Offset ±360° - Independent for each output - phase variation controlled by phase speed (1.5°/s to 360°/s) | |
| Number | 2 to 6 sine generated simultaneously - with independent phases and amplitudes - synchronized frequencies | |
| Multi-sine | Frequency span | From 125 mHz to 40 kHz |
| Amplitude | 0 to 2.5 Vrms - Settling time 100 µs to 10 s | |
| Resolution | 125 mHz to 400 Hz - 101 lines to 6401 lines | |
| Phase | Fixed (all sine have same phase) - Random | |
| Burst | 0 to 100% - Step 1% | |
| Number | 2 to 4 independents multi-sine |
Output signals (continued)
| Random noise | Frequency span | From 125 mHz to 40 kHz - independent lower and upper frequencies |
| Amplitude | 0 to 2.5 Vrms - Settling time 100 µs to 10 s | |
| Type | White - pink | |
| Burst | 0 to 100% - Step 1% - Bloc duration: 2.5 ms to 100 s | |
| Number | 2 to 6 independent and uncorrelated random noises | |
| Chirp | Frequency span | From 3.125 Hz to 40 kHz - independent lower and upper frequencies |
| Amplitude | 0 to 7,07 Vrms - Settling time 100 µs to 10 s | |
| Size | 256 - 512 - 1024 - 2048 - 4096 - 8192 - 16384 | |
| Burst | 0 to 100% - Step 1% | |
| Number | 2 to 6 independents chirps |
In addition to these predefined signal, any recorder or imported signal file can be generated synchronously on front-end the outputs.
Filters
The following filters can be applied on front-end inputs, plug-ins analyzers and output generators.
ABW: the analysis bandwidth, of the plug-in or front end where the filter is in use.
| High pass | Type | Butterworth – IIR type |
| Order | 1 to 6 | |
| Cutoff frequency | ABWto ABW/1024 | |
| Low pass | Type | Butterworth – IIR type |
| Order | 1 to 6 | |
| Cutoff frequency | ABW to ABW /102.4 | |
| Stop/pass band | Type | Butterworth – IIR type |
| Order | 2 to 10 | |
| Cutoff frequencies | ABW to 0.055 * ABW | |
| Bandwidth | ABW/2 to 0.0075 * ABW | |
| Integrators | Type | HP, Single or double |
| High pass frequency | ABW /10 000 or ABW /2 000 | |
| Integration time | 2 ms to 500 s | |
| Differentiators | Type | Single |
| Average | Sliding - 0 to 2 s | |
| Weightings | Laws | A & C laws |
| Bandwidths | 10 kHz to 40 kHz | |
| All | By-Pass | Apply/bypass without stabilisation time - independently on each filter |
| Application | Same filters set for each plug-in | |
| Label | Each filter features a user define name |
Notes
The above specifications describe all the guaranteed capacities and performances of the NVGate V12 or upper. Functionalities may change depending on operation mode (connected to a 3-Series unit or office). Plug-in analyzers, options and channel number availability depend on purchased options.
The instruments hardware are described separately in the "Instruments specifications page" OROS reserves the right to modify the specifications without notification.