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4-1
Section 4
Maintenance, Calibration,
and Troubleshooting
4.1 Maintenance
The 948A-40 Remote Alarm and 948A-50 Remote Alarm/Meter require no routine maintenance other than periodic
calibration for the 948A-50. Refer to calibration for further information.
4.2 Calibration
The 948A-50 requires calibration before it is initially placed into service. In addition, it should be recalibrated at regular
intervals during routine service. The length of time between calibration intervals should be determined by the
customer. Use the following procedure to perform the calibration:
1. Using radios, field telephones, or other suitable communication devices, establish communications between a
technician at the ratemeter location and another at the remote alarm/meter location.
2. To gain access to the meter adjustment potentiometer, open the front panel of the remote alarm/meter. The
potentiometer is mounted on the rear of the panel meter.
3. Adjust the potentiometer until the reading shown on the panel meter agrees with the reading shown on the
ratemeter within ±5%.
4. This concludes the calibration procedure for the 948A-50 Remote Alarm/Meter.
4.3 Troubleshooting
Extreme care must be used when troubleshooting a
system that has power applied. All standard
troubleshooting precautions apply.
Once a problem has been located, remove all power
before continuing with the repair.
Personnel performing the following procedure must be
familiar with the operation of the system and the
location of each piece of equipment used.
WARNING
WARNING
CAUTION