Using an Internal Trigger Source to Collect Data
dataPAC User’s Guide
157
Using an Internal Trigger Source to Collect Data
dataPAC 1500 V5 Only
There are several applications for using an internal trigger source to collect data. Imagine a
stamping press. You want to collect vibration data just as the press stamps, which is
considered to be transient data. Before version 5, this was impossible because even if you
could time your press of the <STORE> button with the press of the stamp, the dataPAC
would try to range for some unspecified amount of time before collecting the data. The data
you would have gotten would not be meaningful. Plus, if you pressed <STORE> before the
stamp, then the dataPAC would auto range to some vibration level much lower than what
occurs during the stamp. So when the press stamps you get clipping or some other range
error.
With this new internal trigger feature, you can observe a few cycles of the press and set up
the range and trigger levels. Then, if the trigger level is set properly, the dataPAC can
measure exactly what you want.
This section shows you how to use an internal trigger source to collect data. This section
also offers information about performing a bump test with the internal trigger source. This is
just an example of an application for the internal trigger source.
Setting up and Collecting an Internally Triggered Spectrum or Time
Waveform
dataPAC 1500 V5 only
You can collect a triggered time waveform, and associated spectrum, using the internal
vibration signal as the trigger source. This feature does not support sychronous averaging,
but rather supports collection of transient data.
This feature allows you to manually set the point at which the dataPAC collects data. For
example, if you would like to measure levels of vibration of a stamping press at the point
where the press stamps, causing the highest levels of vibration, you could use this internal
vibration signal to trigger the dataPAC to take data.
1.
Open the Analysis application from the Program Manager.
2.
Press <F4> (Meas Type) and select Spectra Measurement Parameters.
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