Test Filter Option - GE Bently Nevada 3300/25 Operation Manual

Section 19 - Appendix B–Filter Board Options PWA 79562-01 and PWA 105521-01
19.15

Test Filter Option

This procedure verifies filter settings by using a function generator to simulate a signal
with an amplitude equal to full scale at the -3dB frequency. Since the filter attenuates a
signal with this frequency by 3dB, the monitor output should be 65% to 75% of full scale.
For some full scale ranges such as those listed in
be able to output a signal with an amplitude great enough to match the full scale range
of the monitor. In this case, use the alternate procedure in
Channels A and B must be calibrated before doing this test. Refer to
If barriers are used, test with barriers in place.
1. Disconnect the transducer input wires from the channel A terminals on the Signal
Input Relay Module.
2. Connect a function generator to channel A input terminals as shown in this figure.
WARNING
High voltage present. Contact
could cause shock, burns, or
death.
Do not touch exposed wires or
terminals.
step 5b, the function generator may not
Section 19.16
Section
Caution
Tests will exceed alarm setpoint
levels causing alarms to activate.
This could result in relay contacts
changing state. See Danger
Bypass, Section 12.
to test the filter.
15.
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