Calibration Procedure - Time Electronics 1010 User Manual

Time Electronics
1010 DC Voltage Calibrator
4.3

Calibration Procedure

1) Ensure zero has been set as in section 4.1.
2) Connect power supply.
3) Select 999.99mV range, normal output polarity, and output digits to 99999.
4) Connect a suitable accuracy voltage standard with microvolt null meter to the output
terminals. The voltage standard should have 0.005% accuracy or better and ranges
from 10mV to 10V full scale. The null meter should have a resolution of better than
1µV and preferably have calibrated ranges. A high performance D.V.M. can be used
for calibrating.
5) Adjust the CAL trimmer on the module for better than 50µV null balance against an
output of 999.99mV from the standard. Note that the maximum range of adjustment
of this trimmer is 0.3%.
6) Select 9.9999V range and adjust the 10V range trimmer (VR4), for less than 500µV
null balance against an output of 9.9999V from the standard. Maximum range of
adjustment of this trimmer is 0.08%.
7) Select 99.999mV range and adjust the 100mV range trimmer (VR5) for less than 5µV
null balance against an output of 99.999mV from the standard.
8) The specification allowances for these 3 ranges are as follows:
9.9999V range, +/- 2.5mV.
•
999.99mV range, +/- 250µV.
•
99.999mV range, +/- 55µV.
•
1010 DC Voltage Calibrator
User Manual
v1.2
Page 16 of 19