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Difference between revisions of "NVGate Torsional"
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In the on-line mode the torsional inputs appear as additional in the channels connection dialog box. They are identified as Tors. x from the Signal Op. resource (not visible in the ASB). These signals can be dispatched exactly as the standard inputs ones; recorded, analyzed and monitored with the TDA plug-in. | In the on-line mode the torsional inputs appear as additional in the channels connection dialog box. They are identified as Tors. x from the Signal Op. resource (not visible in the ASB). These signals can be dispatched exactly as the standard inputs ones; recorded, analyzed and monitored with the TDA plug-in. | ||
The torsional inputs may be recorded as it or the source pulses can be recorded also. | The torsional inputs may be recorded as it or the source pulses can be recorded also. | ||
{|border="2" cellspacing="0" cellpadding="4" width="92%" align="left" | |||
|'''Coupling''' | |||
|'''Description''' | |||
|- | |||
|AC | |||
|AC coupling with signal ground connected to the analyzer hardware ground and a 0.35 Hz high pass filter. | |||
|- | |||
|DC | |||
|DC coupling with signal ground connected to the analyzer hardware ground. It is advisable to use the DC coupling when analyzing very low frequency (<nowiki><</nowiki> 10 Hz frequency range). | |||
|}<br clear="all"> | |||
* '''Mode: '''This setting allows selecting available signal generated by the Ext. synch input to be used by the NVGate analysis components. | |||
{|border="2" cellspacing="0" cellpadding="4" width="92%" | |||
|'''Mode''' | |||
|'''Description''' | |||
|- | |||
|Trigger | |||
|The Input generates events only. It can be used as trigger, start and stop of plug-in analyzers and be recorded. Recorded event occurs as 0/1 V signals. Note that the trigger event remains available on any mode. | |||
|- | |||
|Tach | |||
|The input generates a tach signal (RPM and revolution phases) in addition to the events. See Tach § for details | |||
|- | |||
|Torsional | |||
|The input generates the instantaneous velocity measured with the F. to V converter from a pulses train. The torsional signal is considered as a dynamic input. It appears as Tors # in the inputs list (# being the Ext sync number) | |||
|- | |||
|Torsional <nowiki>+</nowiki> Tach | |||
|Same as above plus the tach signal is also available. The revolution phase correspond: | |||
* to the missing teeth occurrence if missing teeth is <nowiki>></nowiki> 0 | |||
* to the ending of the pulse/rev counting at each revolution (no phase reference) if missing teeth setting is <nowiki>></nowiki> 0 | |||
|- | |||
|Sampling | |||
|The detected pulses on the inputs will be used to synchronize the SOA re-sampling algorithm. The number of pulse/rev is f free and may be different from the SAO resolution. | |||
|- | |||
|Sampling <nowiki>+</nowiki> Tors | |||
|Combine the sampling and the Torsional modes. Both angular re-sampling and instantaneous velocity are provided by the input | |||
|- | |||
|Sampling <nowiki>+</nowiki> Tach | |||
|Combine the sampling and the Tachometer modes. Both angular re-sampling and RPM measurement are provided by the input | |||
|- | |||
|Sampling <nowiki>+</nowiki> tach <nowiki>+</nowiki> tors | |||
|Combine the sampling, the Tachometer and the Torsional modes. Angular re-sampling, Tachometer speed and instantaneous velocity are provided by the input | |||
|} | |||
* '''Hold off (% period): '''defines the minimum time (expressed in % of the last valid tach period) between 2 tach pulses used to measure RPM. | |||
If a pulse is detected before this time has expired since the last valid pulse then the new pulse is rejected. This is used to reject angular speed variations that are too large. This minimum time is in fact the maximum between the Hold off setting value and the value computed using the last tach period length and the Hold off (% period) setting value. | |||
''Hidden/fixed: ''Hidden if Mode is Trigger or Torsional. | |||
[[Image:front_end_18.png|framed|none]] | |||
[[Image:front_end_19.png|framed|none]] | |||
* '''Pulse / rev''': the number of pulses per revolution. The user can enter an integer value between 1 and 4092. For a non-integer number of pulses per revolution the user must use a virtual tach. | |||
===Post-processing==== | ===Post-processing==== | ||
For post-analysis purposes, the way to operate depends on the type of recorded signal: | For post-analysis purposes, the way to operate depends on the type of recorded signal: | ||