867B,863
Service Manual
4-22
Calibration 4-20.
The calibration procedure involves 40 steps, all of which must be completed for
calibration to take effect. Each step, as identified on the GMM screen, is also shown in
bold in this manual. For example, “Step 1” as seen on the screen appears as Step 1 in
text.
Measuring the System Resistance 4-21.
Ohms calibration requires that you first measure the system resistance. Use the following
procedure:
1. Rotate the GMM selector to ò (Ohms).
2. Short the test lead ends together.
3. Record the reading (system resistance) shown on the GMM. This data will be used
during the ohms calibration procedure.
Starting Calibration Mode on the GMM 4-22.
Connect the Battery Eliminator to the GMM to ensure stable power during calibration.
Rotate the selector to
(mV DC), and allow for GMM warm up of at least 10 minutes.
In all cases, allow the Calibrator and the GMM to settle before starting the actual
calibration.
Place the GMM in calibration mode by pressing the calibration button. This button is
recessed in a hole on the right side of the GMM; a calibration sticker usually covers this
hole and must be broken to gain access. Use a thin, blunt tool to press the calibration
button. See Figure 4-11.
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Figure 4-11. Initiating Calibration
Now refer to Figure 4-12. ‘Warm up time is 10 minutes’ appears on the display when
“Step 1” is selected. After 10 minutes, or whenever you proceed to “Step 2”, this
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