421 The Calibration Procedure

Now select calibration mode on the Fluke 45. Using a thin, blunt-tipped object, press the recessed Cal Enable button for three seconds. Avoid using sharp objects that might damage this button. Refer to Table 4-8 for brief descriptions of calibration mode commands.

The CALREF xxx.xx command tells the Fluke 45 to change the calibration prompt to the exact value of the input from the calibrator. Use of this command is equivalent to the act of editing the calibration prompt from the front panel when other than exact calibration points are to be used.

The CALSTEP? command normally returns the calibrated value of the input. If the input is not within an anticipated range of the expected value (5 to 15%, depending on the step), a beep is sounded at the front panel, a device dependent error is returned over the computer interface, and the measured reading is returned.

The response to CALSTEP? must be received before each new step can begin. With some steps (such as step 31), a noticeable delay may be encountered.

Before beginning calibration, consider the functions that will be affected. AC volts, dc amps, ac amps, and ohms are all influenced by dc volts calibration. If you calibrate dc volts, you must re-calibrate these other functions. But, calibration of ac volts, dc amps, ac amps, and/or ohms influences only the function being calibrated.

If you plan to include the ohms function in your calibration procedure, determine the residual lead and source zero resistance before you place the meter in calibration mode. Use the following procedure:

2. Measure the residual lead and source zero resistance on the 300 W range by sending: VAL?

3. Record the response. This value is used if you elect to perform the Alternate Ohms Calibration.

4. Now continue on with the calibration procedures in the following paragraphs.

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DIY Battery Repair

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