NVGate Ribbons: Analysis Tab
The "Analyses" tab
In this tab, the software gathers the analyses controls. Each group corresponds to a plug-in analyzer. The content of this tab depends on the purchased optional plug-in.
Monitor group
The Monitor plug-in offers simple and powerful ways to monitor the measured signals. This 4 channels plug-in runs independently from the general analyzer status (running/Paused/stopped) with the capability of swapping connected channels at any time.
The second capability of the monitor is to extract statistical component of the signal in a specific bandwidth. Extracted levels can be used for triggering and waterfall references.
The monitor runs its analyses on a specific processor (DSP) allowing a totally independent computation for the regular analyses.
Note: Clicking on the bottom right icon (
) opens the monitor plug-in properties dialog allowing a full access to all the settings.
Inputs: Opens the channels sources selection. Allows choosing which input or track is monitored. Up to 4 ch at a time. The channel sources can be swapped at any time without influence on the other signal processing (analysis, record, play-back) of the instrument. See Chapter 1 ASB - § Monitor and waterfall/ Monitor for details
Average decay: Setup the exponential spectrum average decay of the FFT part.
Overall analysis: Opens the statistical extraction setting. This dialog set up the filter characteristics and the averaging of the extracted values (DC, RMS, Min/Max, Kurtosis)
Filter: Allows applying the filter (Tick on) or bypassing it (No Tick). The Bypass is immediate without delay. See Chapter 1 ASB - § Monitor and waterfall/ Monitor for details
Time Domain Analysis group (Optional)
The TDA plug-in is designed to get the most from the time domain signal completing the frequency/order analyses. This plug-in offers flexible signal overview and statistical extraction in parallel.
Note: Clicking on the bottom right icon (
) opens the TDA plug-in properties dialog allowing a full access to all the settings.
- Synchronization: Controls the plug-in synchronization with the general analyzer status:
Linked to run: The plug-in is controlled by the general Run / Pause / Stop controls. It operates synchronously with the Other plug-in (except the Monitor)
Free run: The plug-in runs continuously independently from the general Run/Pause/Stop. Note: The start/stop trigger continue to control the plug-in processing
Range: Setup the analysis range for the plug-in. This value is maximized by the front-end sampling frequency divided by 2.56.
Note: Each plug-in feature an independent bandwidth.
Average: Setup Average type for the statistic extraction. It can be exponential with a sliding decay or linear. Multiple linear averaging are obtained by setting the TDA/Trigger/Repeat to : End of averaging
Average duration: Setup the average duration. In Exponential mode it specifies the non decayed part of the signal. In linear mode, it specifies the complete duration. In Linear repeated mode, it specifies the short duration. See Chapter 1 ASB - § Analysis plug-in/ TDA for details
FFTx group (Optional)
The FFT plug-in provide frequency distribution of the analyzed signal. It runs an FFT algorithm.
Note: Clicking on the bottom right icon (
) opens the FFTx plug-in properties dialog allowing a full access to all the settings.
Note: Up to 4 FFT plug-in can be present in the software configuration, each of them running independent analyses on the same or different channels.
Range: Setup the analysis range for the plug-in. This value is maximized by the front-end sampling frequency divided by 2.56.
Note: Each plug-in feature an independent bandwidth.
Lines: Select the analysis resolution in number of frequency lines. The resolution = Range / (Lines-1) in Hz
Average: Select the domain of averaging:
- Spectral: the spectra module are averaged together
- Time: the trigger block are averaged together -> provide absolute / relative phase
- Frequency domain synchronous (FDSA): The complex spectra are averaged together (real/img) after phase synchronization on one spectral line -> allows synchronous time averaging (STA) without a trigger.
See Chapter 1 ASB - § Analysis plug-in/ TDA for details
Synchronous order group (Optional)
The SOA plug-in provide order distribution and extraction of the analyzed signal related to a tachometer. It runs re sampling + FFT algorithms
Note: Clicking on the bottom right icon (
) opens the SOAx plug-in properties dialog allowing a full access to all the settings.
Note: Up to 2 SOA plug-in can be present in the software configuration, each of them running independent analyses on the same or different channels.
Max order: Setup the order analysis range for the plug-in from 6.25 to 400.
Associated tach: Select the tachometer to be used for signal re-sampling. The order results provided by the SOAx plug-in are related to this tachometer speed
Order resolution: Select the analysis resolution in orders. Ranges from 1/32 (0.03125) to 1 order.
Average: Select the type of averaging. Linear, exponential peak hold and ref. peak hold See Chapter 1 ASB - § Analysis plug-in/ SOA for details
/nth octave group (Optional)
The 1/n Octave plug-in provides constant percentage band spectra. It runs filter and detector. This plug-in complies the IEC 60 804 and 62 260 standards.
Note: Clicking on the bottom right icon (
) opens the 1/n OCT plug-in properties dialog allowing a full access to all the settings.
Upper band: Setup the center frequency of the highest frequency band
Lower band: Setup the center frequency of the lowest frequency band
Resolution: Select band resolution: from 1 band per octave to 24 band per octave.
Type: Select Averaging type. This setting features a mix of different averaging modes such as time weighting, classic, constant band* time and repeated Leq.
Average duration: Define the total average duration and the linear duration for exponential.
Short duration: Define the short average duration for the linear repeated and Leq. See Chapter 1 ASB - § Analysis plug-in/ 1/n Octave for details
Overall acoustic group (Optional)
The overall acoustic plug-in provides sound pressure level measurement. This plug-in complies with the IEC 61672 standard. It runs 3 RMS detectors + 1 peak per channel.
Note: Clicking on the bottom right icon (
) opens the 1/n OCT plug-in properties dialog allowing a full access to all the settings.
Detector: opens the detectors properties. 1 peak and up to 3 RMS detector can be activated. They process all plug-in channels simultaneously.
Average: Select the averaging type from Linear and 3 short Leq (1s, 1/8s and user defined
Average duration: Define the total average duration.
Short duration: Define the short average duration for the linear and user defined short Leq See Chapter 1 ASB - § Analysis plug-in/ Overall acoustics for details
Waterfall group
The so called waterfall is a stack for analysis results and reference. It allows storing results from different plug-ins in a synchronized database. These data are viewed with the 3D waterfall or profiles graphs.
Note: Clicking on the bottom right icon (
) opens the 1/n OCT plug-in properties dialog allowing a full access to all the settings.
Add/remove: Opens the waterfall add/remove result dialog. This dialog allows selecting the list of result to be collected by the waterfall plug-in.
- Plug-in analyzer tab: A tab is displayed for each plug-in analyzer connected. This displays waterfall source results.
- Result: List of results provided by the plug-in analyzer selected. This can be the source of the waterfall plug-in analyzer.
- Channel: List of plug-in analyzer channels connected, available for the result selected.
- Reference / X: List of plug-in analyzer channels connected. This can be the reference. Available for results that require a reference only (cross-spectrum, for example).
- Tracked order: List of tracked orders on the channel selected. Available if result selected is an order result.
- Waterfall: List of 3D Waterfall displays. These waterfalls can be displayed versus any one of the references selected in the "Reference and profiles" list.
- References & Profiles: List of profiles and references provided by the waterfall plug-in. All scalar profiles selected can be used as references, except monitor scalars, sound level meter scalars, and orders.
Adds a new Waterfall. If the result selected is a scalar, a new profile is added to the "References and profiles" list. Otherwise, a new Waterfall is added to the "Waterfall" list.
If the Waterfall or profile already exists, the clicking on this button has no effect.
If a tracked order is selected, all orders tracked on the channel selected are added.
Removes the selected result from the corresponding list.
Mode: Select the data collection synchronization:
- One shot: The waterfall is fulfilled in one shot from its start trigger to the stop one.
- Continuous: the plug-in is fulfilled as a rolling buffer (FiFo) memorizing the last data only.
Depth: Defines the maximum number of slices to be collected. In the continuous mode it defines the depth of the rolling buffer. See Chapter 1 ASB - § Monitor and waterfall/ Waterfall for details