GE Bently Nevada 3300/25, Руководство по эксплуатации

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Section 20 - Appendix C–Filter Board Options PWA 148921-01
133
20.13 Test Filter Option (Alternate Procedure)
This procedure should only be used when your Full Scale Range Option is 05, 06, 15, 16,
or 17 (see Section 8.2 ) and the full scale amplitude calculated in step 5b of the main
procedure ( Section 20.12 ) is greater than 3.5V or too small to set up accurately on your
function generator.
Note: Both channels A and B must be calibrated before performing this test (see
Section
15 ). Test equipment should be set up as shown in step two of Section 20.12 . If barriers
are used, test with barriers in place.
1.
Configure the main board as follows to change the Integrator Stage to a Gain
Stage:
Channel A: Install W6B,C
Remove W6A
Channel B: Install W3D,E
Remove W3F
2.
Adjust the frequency of the function generator to the -3dB frequency of the filter.
For High Pass Filters, the -3dB frequency is the corner frequency chosen in
Section 20.7 or 20.8 . For Low Pass Filters, the -3dB frequency is the corner
frequency chosen in Section 20.10 . Set the amplitude of the function generator
for a full scale sine wave signal with a -7.5 Vdc offset:
3.
Verify that the front panel bargraph for the channel being tested reads 65% to
75% of full scale range.
4. If you are testing a Band Pass Filter, repeat steps two and three at the second -
3dB frequency.
Full Scale Input Voltage Full Scale Option
Vpk Vrms
05 0-1 in/s
06 0-2 in/s
15 0-25 mm/s
16 0-50 mm/s
17 0-100 mm/s
0.500
1.00
0.492
0.984
1.969
0.354
0.707
0.348
0.696
1.392