132 Chadwick-Helmuth Company, Inc.
Chapter 6 - Maintenance
20. Press spread factor OFF and number of blades to 1.
21. Two images of the C-H logo should be in evidence on strobe disc of
calibrator.
22. Change number blades to two (2).
23. Observe 4 stems on C-H logo of calibrator strobe disc.
24. If these readings are observed, unit is serviceable.
6.3.5.2 Instrument Test Procedures for the Vibrex 2000
and Vibrex 2000 Plus
The following tests provide the highest confidence that the instrument is
accurately measuring the incoming sensor signals.
6.3.5.3 Approach:
Signals from a calibrated source will be measure at start, mid, and end
band frequencies of the filters used and compared to insure they meet
specifications. In addition, a mid band signal will be measured for
amplitude, phase, and frequency response and compared to specification.
All the above testing will be repeated for each of the 2 signal paths.
Test Equipment:
HP 8904A
Signal
Generator
Hewlett-Packard 10 mV to 5 VAC (+/-0.1%),
distortion plus noise less
than -60 dB, sync to sine
signal phase relation
ship180 degrees
BNC to Velo
cable 8278
Chadwick-Helmuth
BNC to Mag
cable 10502
Chadwick-Helmuth
Fluke True
RMS meter
Fluke 5% 2 Hz - 10 kHz
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