Service manual

Calibration and Verification
Routine Calibration 3
3-27
Range Gain Points
1. On the Calibrator, select the positive Range Gain point Output value.
2. On the Multimeter, Press
CAL to revert to CALIBRATION menu.
3. Select
Set on the CALIBRATION menu.
4. Use the numeric keys with the
SET VALUE menu to key in the true output value of
the calibrator at the range gain value, then press Enter.
5. Press
SAMPLE to initiate the calibration operation.
6. Calibration is complete when the Busy legend goes out and the calibrated
measurement is displayed.
7. On the Calibrator, select the negative Range Gain point Output value.
8. Repeat steps 3 to 5 above to calibrate the negative Range gain point.
9. On the Calibrator, set
STANDBY.
10. Press the DCI key to revert to the ranges menu.
AC Current Calibration
XW Warning
The Calibrator can deliver a lethal electric shock.
To avoid electric shock when performing the following
calibration procedures:
• Never touch any lead or terminal unless you are absolutely
certain that no dangerous voltage is present.
• Make sure that signal leads are in a safe condition before you
handle them in any way.
Initial Setup and Connections
1. Press the ACI key, and select the
200μA range.
2. Press the
CONFIG key. In calibration mode in the ACI function resolution defaults to
RESL6 and the 100Hz RMS filter is automatically selected. It is recommended that
this resolution and 100Hz Filter is used for calibration of all ACI ranges.
3. Reselect
ACI.
4. Confirm that the Multimeter is configured for internal guard (External Guard is
deselected) by checking that the
Ext Grd legend does not appear on the left-hand
display.
5. Ensure that the calibrator output is set to
STANDBY and configured for Internal
Guard (
EXT GRD is deselected).
6. Connect the Calibrator to the Multimeter as shown above.
Range Zero and LF Gain Calibration Procedure
Using the following procedure to calibrate range zero then range gain on all ACI ranges
at the currents and frequencies detailed in Table 3-7. Just one range can be calibrated if
required, but for a full-calibration start with the 200 µA range and work up to the 20A
range.
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