5790B
Operators Manual
4-30
Set up a Fluke A40/A40A or Custom Current Shunt
To set up an A40/A40A or Custom current shunt:
1. Select Setup Menu >Instrument Setup >Current Shunt Details.
2. Navigate to page 2 of the menu and select A40/A40A/Custom Shunt.
3. To load new shunt Information, select Add New. For an existing shunt, select
the serial number from the list.
4. Add the serial number, calibration date, True Resistance, and AC/DC Diff
Error located on the calibration certificate.
Note
For accurate absolute current measurement, the Product must know
the true resistance value of the current shunt. Any time the true
resistance value of the shunt is unknown, “0” must be entered into
the True Resistance field. If the true resistance value is unknown, to
prevent misinterpretation of the current measurement on the main
menu, the True Resistance field will be greyed out and ------ replaces
the current measurement on the main menu. The voltage
measurement are still shown allowing it to be extracted and used for
external calculations. The A40 and A40A calibration certificates do
not list the true resistance value and when used, the current
measurement will be “unknown” and only the voltage measurement
is shown on the main menu. For Custom shunts, if the true
resistance value is known, enter it into the field in setup to allow for
direct, absolute current measurements and for the current
measurement to be present.
Note
The Loading Error at various frequencies is based on empirical
studies and is listed in the A40B Instruction Manual. These loading
errors are pre-programed as defaults for each shunt range.
5. Select Done to save the A40, A40A, or Custom shunt to memory.
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