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

20.12

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
WARNING
High voltage present. Contact
could cause shock, burns, or
death.
Do not touch exposed wires or
terminals
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.
Section 20 - Appendix C–Filter Board Options PWA 148921-01
If barriers are used, test with barriers in place.
step 5b, the function generator may not
Section 20.13
Section
Caution
Tests will exceed alarm setpoint
levels causing alarms to activate.
This could result in relay contacts
changing state. See the Danger
Bypass section
to test the filter.
15.
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