416 Editing the Prompt for Different Calibration Points

Except for the first three prompts in VDC (0.000 mV, +90.000 and -90.000 mV are calibration constants), the Fluke 45 can be calibrated using calibration points other than the prompted values. To do this, you must edit the prompt to the reference source value as follows:

1. Press the editor button. This intensifies the left-most digit of the numeric display and turns the EDIT annunciator on.

2. Press the ( editor button to increment the intensified digit from 0-9.

3. Press the editor button again to intensify the next digit to be edited.

4. Once the edited value is equal to the reference source value, push the A button to exit the edit mode.

Holding down the editor buttons causes continual incrementing until the button is released.

For calibration at points other than full scale, you must account for the effect of non-linearity and noise on the accuracy specifications. This effect is expressed as a percentage added to the Fluke 45 specification.

Table 4-6 shows additional errors to be added to the specifications when calibration is conducted at points other than full range.

For example, if ohms is calibrated using decades of 1.9 (190 W, 1.9 kW, etc.), the additional error on the 300 W and 100 W ranges is 0.01%. Therefore, since calibration has been performed at less than full scale, 0.01% must be added to the Fluke 45 300 W and 100 W range accuracy to arrive at the new specification.

Note that the first three calibration points (0, 90 mV, and -90 mV) cannot be edited. Also, to provide accuracy at full range, calibration is not recommended below one-third of full range (10000 counts).

Table 4-6. Specifications Increase with Different Calibration Points

Function

Cal Point In Display Counts

20000

19000

10000

DC

.006%

.006%

.012%

AC

.045%

.05%

.09%

300 W/100 W

.01%

.01%

.02%

kW/MW

-

-

.01%

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