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Publication No. 980972 Rev. B 850A/B User Manual
Chapter 3
Calibration
The circuitry of the 850A/B Contact Chatter Detector is stable and should require
calibration only in the case of part failure. Astronics Test Systems recommends a
12-month calibration period or longer.
Refer to Figure 3-1 for both calibration adjustments. Remove top cover of the
850A/B to access components.
Timing Interval Adjustment
1. Connect a frequency counter to Pin 3 of U3 (Figure 3-1).
2. Set the MICROSEC-MILLISEC Switch to MICROSEC.
3. Set the timing adjust R33 for an indication of 1 MHZ ±10 kHz.
4. Place the MICROSEC-MILLISEC switch to MILLISEC.
5. The counter should indicate 1000 ±10 Hz.
Figure 3-1. Calibration Adjustments
Pin 1, U3
R32
R33
Astronics Test Systems
Calibration 3-1
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