4
4. This instrument is equipped with an automatic low battery indicator.
When the LCD “BAT” indicator appears, the battery should be replaced
immediately so that the calibrator’s output accuracy is maintained.
4. Accuracy
The PCL422A is checked against an traceable reference before
shipment to verify that each range falls within the .015%, ±2 counts of
accuracy specification. Long term accuracy, beyond one year, should
remain within .030%, ±2 counts of FSR. All of these ratings are based on a
18°C to 28°C ambient temperature.
From 18°C to 0°C and from 28°C to 50°C, there is an accuracy change of
.005% of full scale per °C. Therefore, allowances must be made for error
caused by wide temperature variations.
5. Maintenance
Only qualified service personnel should perform calibration, repairs, or
servicing not covered in this manual. If the calibrator fails, check the batteries
first, and replace them if needed.
Verify that the calibrator is being operated as explained in this manual. If the
calibrator is faulty, call OMEGA's customer service department for an AR
number to return the unit. Be sure to pack the calibrator securely, using the
original shipping container if it is available.
6. Rechargeable Battery Option
When continual service is required, a rechargeable “NI-Cad” 9V battery and
wall mount AC adapter/charger may be purchased. The AC adapter may be
left on continually to keep the charge up on the battery while the instrument
is in use or can be used to recharge a low battery over a 12-14 hour period.
The AC adapter/charger can also be used solely as an AC power supply
without battery installed.
When using the “Ni-Cad” battery, it is advisable to occasionally allow the
instrument to operate until the “BAT” indicator appears then recharge. This
procedure will cycle the battery and prevent any “memory” effects that are
associated with this type of battery.
