Service manual

Calibration and Verification
Routine Calibration 3
3-25
5. Press SAMPLE to initiate the calibration operation.
Calibration is complete when the Busy legend goes out and the calibrated
measurement is displayed.
6. On the Calibrator, set
STANDBY.
7. Press the
Ω key to revert to the ranges menu.
DC 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
1. Press the
DCI key, select the 200 μA range.
2. Press the
CONFIG key. Select Filt.
3. In calibration mode the resolution defaults to
RESL7 in the DCI function. It is
recommended that this resolution is used for calibration of all DCI ranges.
4. Reselect
DCI.
5. 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.
6. Ensure that the calibrator output is set to
STANDBY and configured for Internal
Guard (
EXT GRD is deselected).
7. Connect the Calibrator to the Multimeter as shown above.
Range Zero and Gain Calibration Procedure
After the initial setup and connecting up, use the following procedure to calibrate range
zero, then positive and negative range gains on all DCI ranges. 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, as shown in Table 3-6.
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