Time Electronics 1048 Voltage-Current-Loop Calibrator - Manual (Page 18)

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V1.2 30/12/10 P a g e | 18 1048 Technical Manual
7.4. Measure Function Calibration
1) a) Switch on the unit while holding down the ‘Decrement-DEC’ button (left side). Select
the ‘V’ position.
b) Select ‘MEAS’ on the Function switch.
c) Select ‘0.22’ on the Range switch.
d) Select ‘NORM’ on the Output switch.
Note: It may be necessary to check the required switch positions by looking at the markings
on the front panel.
2) Connect the precision DC voltage calibrator to the unit’s terminals and select zero
output. Check that the unit is displaying 00.00. Note that it may take a short while for
the connection leads to stabilize thermally and settle down.
3) Inject 190.00 mV from the calibrator and adjust P3 for the correct reading on the
display.
4) Select ‘2.2’ on the Range switch and inject 1.9000 V from the calibrator. Adjust P5 for
the correct reading on the display.
5) Select ‘22’ on the Range switch and inject 19.000 V from the calibrator and adjust P7
for the correct reading on the display.
6) Reduce the output from the calibrator to 1.9000 V and reading on the display. Return
to test above and re-check the 22V range. There is a small amount of interaction of P5
and P7.
7) Finally re-check the 2.2V range to ensure that it has not changed.
8) Over-Range check: The unit allows measurement up to 50V on the 22V range. This
can be checked by injecting 30, 40, 50V.
This completes the calibration of the measure function and the precision DC calibrator can
be disconnected.