Commtest Instruments vb Series Instrument Reference Manual page 49

The duration value can be set in three ways:
OR
OR
•
•
Select the number of samples by pressing
the number of spectral lines used when the waveform is
transferred to Ascent and displayed as a spectrum.
•
Set the number of averages by pressing
value displayed. 16 or more averages is recommended in
order to remove non-synchronous peaks from the final
spectrum.
Note: You must use a tachometer as the trigger source.
When measuring is complete the resulting time waveform can be
transferred to your PC and viewed as a spectrum within the Ascent
software.
To store the measurement see Storing Measurements (page 54).
Setting your own parameters
Option
your own settings instead of the factory defaults. See Custom Setups
(page 57) for more information.
40 Section 3: Onsite Analysis - Measurement Menu
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
Press to display the Machine Running Speed Menu
then use the number keys to enter an RPM value. The
duration will be set to the time it takes the machine to
make 20 revolutions.
Press to display the Set Duration Menu and use
or to select a value.
Press to display the Set Fmax Menu and use
to select a value. The value you select will determine
the equivalent duration value. If the waveform is later
transferred to Ascent and displayed as a spectrum, this
Fmax value will be used on the chart.
Custom Setup allows you to customize this menu to use
or
. This controls
to change the