Front Panel Operation
Instructions for Current Measurements 4
4-25
Instructions for Current Measurements
The Product makes accurate absolute and relative current measurements when
used in conjunction with a current shunt. Fluke offers three current shunts that
can be used with the Product: the A40B, A40A, and A40. The Fluke A40B makes
direct, absolute current measurements and offers optimal performance and
convenience. Use one of the following shunt and input combinations to measure
current with the Product:
• Fluke A40B Current Shunt connected to INPUT 1 or INPUT 2 to make
absolute or relative measurements. See Current Measurements with the
Fluke A40B.
• Fluke A40 or A40A connected to INPUT 1 or the AUX input to make relative
ac measurements. See Current Measurements with the A40/A40A.
• Custom current shunt connected to INPUT 1 or INPUT 2, to make absolute or
relative measurements, depending upon the characteristics of the shunt.
Notes
The Fluke A40B is specified for absolute dc resistance and offers
direct measurement of current from dc to 100 kHz with comparable
accuracy than the previously available shunt technology used in the
Fluke A40 and A40A. The A40B has outstanding resistance value
stability, an excellent self-heating power coefficient, and a low-
temperature coefficient. Fluke Calibration recommends Fluke A40B
Current Shunts for direct, absolute current measurements.
To make current measurements with the Fluke A40/A40A or Custom
current shunts, special Fluke adapters are required. See Current
Measurements with the A40/A40A or Custom Shunts for more
information.
See the subsequent sections for more instructions on how to connect and make
measurements with each current shunt.
Current Measurements with the Fluke A40B
Overview
The A40B current shunts (1 mA to 100 A) give optimal performance when
making direct absolute ac or dc current measurements or ac/dc current transfer
measurements.
The A40B shunts connect directly to the inputs without the need for an adapter.
This reduces the potential for errors and is a method for making direct, absolute
current measurements.
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