426 Ohms Calibration Computer Interface

If you do not have the value resistors (290 W, 2.9 kW, 29 kW, etc.) required by the Fluke 45 calibration prompts, the requested value (prompt) may be set to the value available. In the following procedure, the Fluke 5700A Multifunction Calibrator is used as the ohms source, with input values of 190 W, 1.9 kW, 19 kW, 190 kW, and 1.9 MW.


If you are using an ohms calibrator without active 2-wire compensation, take a zero ohms measurement before entering calibration mode. Use the test leads that will be used for ohms calibration. Record this zero ohms value. The CALREF xxx.xx command tells the Fluke 45 to calibrate to the exact ohms value ofthe calibrator resistance. For the 290 W and 2.9 kW steps, xxx.xx should be the calibrator value plus the recorded zero ohms value.

1. Connect the Ohms Calibrator to the Fluke 45 VH^^ and COM inputs. Then send: CAL 7

Note that the 300 kW and 3 MW ranges are quite sensitive to noise. Any movement of the input leads or movement of the hands or body in the vicinity of the leads can cause noisy readings. Use shielded leads during this calibration. Verify these two calibration points for accuracy at the conclusion of the calibration procedure.

2. Complete steps 25 through 29 in Table 4-7. Then clear the ohms source.

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