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6 - Recalibration
INTRODUCTION
Recalibration of the 1044 is essential to ensure both correct operation
and maintain accuracy. Recalibration is recommended annually.
This chapter gives calibration information.
RECALIBRATION
This instrument is calibrated before it leaves the factory and the calibra-
tion controls will not normally need adjustment, although periodic annual
re-calibration is recommended. If re-calibration is found to be necessary
then follow this calibration procedure and adjust the outputs to the pub-
lished specifications.
All readings are taken from the front panel LCD display. Once calibrated,
the 1044 would only need verification that these readings are accurate.
Equipment required for verification is a digital multimeter with an accuracy
of at least 0.01% and a voltage and current source of similar accuracy.
Suggested items would be the Time Electronics 5075 High Resolution
Digital Multimeter and the Time Electronics 5018 Voltage and Current
calibrator.
The calibrator procedure is as follows -
To adjust the trimpots follow the procedure described in fuse replace-
ment.
The zero is factory set and should not require adjustment. Set the Output
Adjust potentiometer to full scale. All adjustments are to be within 0.05%
± 1 count and are taken from the front panel LCD display.
1) Locate the 200mV trimmer pot on the rear of the LCD display. This
can be reached via a hole in the PCB. Set the 1044 to the 200mV
range and adjust the trimmer to give 200mV.
2) Locate VR7 - 20V adjust. Select the 20V range and adjust VR7 for
reading of 20V.
3) Locate VR6 - 2V adjust. Select the 2V range and adjust VR6 for a
reading of 2V.
4) Locate VR5 - 20mA adjust. Select the 20mA current range and
adjust VR5 for a reading of 20mA.
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