
Maintenance
3500/42 Operation and Maintenance
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5.1.5.3
Verify Channel Values - Radial Vibration
The general approach for testing channel values is to simulate the vibration and
Keyphasor input signal with a function generator. The output values are verified
by varying the input vibration signal level (both peak to peak amplitude and DC
voltage bias) and observing that the correct results are reported in the
Verification screen on the test computer.
Note
These parameters have an accuracy specification of ±1 % of full scale for
amplitude and ±3 degrees for phase.
Direct
1. Disconnect PWR, COM, and SIG field wiring from the channel terminals on
the I/O module.
2. Connect test equipment and run software as described in Section 5.1.5.1
(Test Equipment and Software Setup - Radial Vibration).
3. Calculate the full-scale voltage according to the equation and examples
shown below. Adjust the amplitude of the function generator to the
calculated voltage.
Full Scale Voltage = Direct Meter Top Scale
×
Transducer Scale Factor
Note
Use the Transducer Scale Factor displayed in the Scale Factor Box on the
Verification Screen.
Example 1:
Direct Meter Top Scale = 10 mil
Transducer Scale Factor = 200 mV/mil
Full Scale = (10
×
0.200)
= 2.000 Vpp
For Vrms input:
Vrms
= (0.707/2)
×
(Vpp), for a sinewave input
= (0.707/2)
×
(2)
= 0.707 Vrms
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