Lucent Technologies Lineage
®
2000 200A Ferroresonant Rectifier J85503B-2
7 - 14 Troubleshooting and Adjustments
Issue 8 January 1999
Calibrate CM3
Digital Meter
Calibration is not feasible unless the test meter has an accuracy
of ± 0.02 percent or better.
1. Loosen the locking screws and open the front door of the
rectifier.
2. Locate the CM3 digital meter board on the inside of the
front door.
Warning
Exercise extreme care when removing the CM3 board from the
support standoffs.
The CM3 board can be calibrated without removing the
board from the support standoffs.
3. Locate the R15 potentiometer on the meter board (see
Figure 7-1). R15 is easily accessible on the component
side of the board.
4. Adjust the load so that the rectifier delivers approximately
100 amperes, 50% of its rated current capacity.
5. Connect a DMM, set on the dc millivolt scale, across the
329 test points E25/E26. See Figure 6-2.
6. Observe the DMM and record the rectifier’s shunt voltage.
The shunt is rated 250A/50mV=5A/mV, which means that
each millivolt of voltage drop across the shunt indicates
5A of output current.
7. Convert the DMM shunt voltage reading to amperes. For
example, if the DMM reads 20mV, then 20mV x 5A/mV =
100A of output current.
8. Compare the amperes calculated in Step 7 with the digital
display of the meter while the switch is in the AMPS
position. If the digital display is not between ±2% ±2A of
the amperes calculated in Step 7, calibrate the CM3 card
via its R15 potentiometer.
Table 7-G provides digital meter tolerances.
Table 7-G: Digital Meter Tolerance
Switch Position
Tolerance
Rect V
± 0.1 volt
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