330500 Velomitor Sensor, 330525 Velomitor XA Sensor, 330530 Radiation Resistant Velomitor Sensor Operation Manual
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Step 7.
Adjust the probe-to-target gap so that the Proximitor® Sensor output is
at midrange, -10.0 ± 0.5 Vdc.
Step 8.
Connect the velocity transducer to the oscilloscope or voltmeter as
shown in Figure 3-1.
3.2 Performance Test Procedure
Step 1.
Set the signal generator to 100 ± 1 Hz and adjust the power amplifier gain
so that the Proximitor® Sensor output is .318 ± .003 volts peak-to-peak (0.112 ±
0.001 Vrms). This signal corresponds to a peak-to-peak displacement of 0.00159
inches (0.0404 mm) and a peak-to-peak velocity of 1.0 inch per second (25.4
mm/s).
Step 2.
Verify that the output of the velocity sensor is between .095 and .105 volts
peak-to-peak (.0336 to .0371 Vrms). If the output is not in this range, return the
unit to the factory.
3.3 Polarity Test Procedure
Use this test to verify the proper phase response. Any out-of-phase response will
adversely affect machinery balancing.
Step 1.
Connect the cable as shown in the setup in Figure 3-1.
Step 2.
Set the time base on the oscilloscope to 20 milliseconds/division.
Step 3.
Hold the velocity sensor in hand and tap the bottom. Verify that the
waveform on the oscilloscope first goes positive as shown in Figure 3-3. If it goes
negative first, return the unit to the factory for replacement.
(1) Display
goes
positive
Figure 3-3
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