Troubleshooting Guide
8500C/8500C+ System Maintenance Manual
5-37
Table 5-9. 8500C/C+ Balancer/Analyzer Functional Tests
Problem
Solution
5.4.1.3 Balance Test
Readings do not meet specifications.
1. Ensure gap between magnetic pickup and
screw is .030 +.010 in.
2. Perform 5.5.1.3, “Amplitude, Frequency,
and Phase Accuracy Tests,” to determine
whether fault is with 8500C/C+.
3. Perform 5.5.2.3, “Amplitude, Frequency,
and Phase Accuracy Test,” only for those
8520C channels that failed balance test.
4. Check calibrator in accordance with
Chadwick-Helmuth manual,
Calibrator:
Operation & Maintenance Instructions
, P/
N 9077A.
5. Replace Velocimeter/mag pickup and retest.
5.4.1.4 Spectrum Test
Vibration level and/or frequency do not meet
specifications.
1. Perform 5.5.1.3, “Amplitude, Frequency,
and Phase Accuracy Tests,” to determine
whether fault is with 8500C/C+.
2. Perform 5.5.2.3, “Amplitude, Frequency,
and Phase Accuracy Test.”
3. Check calibrator in accordance with
Chadwick-Helmuth manual.
Calibrator:
Operation & Maintenance Instructions
, P/
N 9077A.
4. Replace Velocimeters/mag pickup and
retest.
