GE Bently Nevada 1900/27 Operation And Maintenance Manual page 40

1900/27 Vibration Monitor Operation and Maintenance Manual
7. With the sinewave generator powered off, measure the DC voltage
8. Turn the sinewave generator on and adjust the output of the
9. Measure the RMS voltage on the output on the Buffered Transducer
10. Measure the DC voltage between the LOOP+ and TEST connectors
11. If desired, verify the accuracy of the loop by adjusting the output of
12. Turn off the sinewave generator.
13. Unplug the power cable from both the monitor and 4 to 20 mA
14. Disconnect the power cable from the power supply terminal strip.
15. Disconnect the resistors, jumper wires and sinewave generator
16. Snap the case cover back into place over the printed circuit boards.
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across the "LOOP +" and "TEST" connections on the 4 to 20 mA
terminal block. The voltage should be about 0.40 Vdc. If it is not,
adjust the zero adjust potentiometer (R16) until the voltage is 0.40
Vdc.
generator for a 1.30 V
about 46.7 mm/s (1.840 ips).
output connector. The multimeter should read 0.65 V
not, adjust the output of the sinewave generator either up or down
until the buffered transducer output is 0.65 V
of the 4 to 20 mA terminal block. The reading on the multimeter
should be 1.87 V . If it is not, adjust the gain adjust potentiometer
dc
up or down until the voltmeter reads 1.87 V
the sinewave generator to 0.707 V
between LOOP+ and TEST. The reading should be between 1.18 V
and 1.22 V . If it is not, repeat Steps 7 through 10 of this procedure.
dc
power sources.
from the transducer terminal strip.
at 614 Hz. The LCD display should read
rms
and measuring the voltage
rms
. If it does
rms
.
rms
.
dc
dc