Maintenance
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8. Repeat steps 1 through 7 for all configured channels.
5.1.9.4
Verify Filter Corner Frequencies
The general approach for testing these parameters is to simulate the
Acceleration signal with a function generator and power supply. The corner
frequencies are verified by varying the output from the test equipment and
observing that the correct results are reported in the Verification screen on the
test computer.
Note
If the channel units are integrated, change the channel configuration to a non-
integrated scale for this test. When the test is complete, return the channel to
its original configuration.
1. Disconnect PWR / B, COM, and SIG / A field wiring from the channel
terminals on the I/O module.
2. Connect test equipment and run software as described in Section 5.1.9.1
(Test Equipment and Software Setup - Acceleration).
3. Calculate the verification frequency using the method in Section 5.1.9.5, page
175. Adjust the function generator frequency to the calculated value.
4. Calculate the full-scale voltage using the formulas in Section 5.1.9.6, page
175. Adjust the function generator (sinewave) amplitude to the calculated.
5. Verify that the Direct bar graph display and the Current Value Box is reading
full scale.
6. Adjust the function generator frequency to the Low-pass Filter Corner
Frequency. Verify that the Direct bar graph display and the Current Value
Box is reading between 65 % and 75 % of full scale.
7. Adjust the function generator frequency to the High-pass Filter Corner
Frequency. Verify that the Direct bar graph display and Current Value Box is
reading between 65 % and 75 % of full scale.
8. If the reading does not meet specifications, check that the input signal is
correct. If the monitor still does not meet specifications or fails any other part
of this test, go to Section 5.1.11 (If a Channel Fails a Verification Test).
9. Disconnect the test equipment and reconnect the PWR / B, COM, and SIG /
A field wiring to the channel terminals on the I/O module. Verify that the OK
LED comes on and the OK relay energizes. Press the RESET switch on the
Rack Interface Module (RIM) to reset the OK LED.
10. Repeat steps 1 through 9 for all configured channels.
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