Front Panel Operation
Instructions for Current Measurements 4
4-29
Connect an A40/A40A to the AUX Input
Warning
To prevent measurement errors that could lead to personal
injury or equipment damage, do not use the AUX input with
custom shunts. Measurement errors result from the 90 Ω built-
in AUX input resistor.
A40A
F
UHF
F
UHF
Adapter
Adapter
cable
A40
1” Spacing
F
M
5790A-7001
UHF
5790B
INPUT 1
10 MΩ
AUX
Input
90 Ω
hvi011.eps
Figure 4-5. Measuring Relative Current Using 5790A-7001
Use the 5790B-7001 accessory to connect the Fluke A40 or A40A Current
Shunts to the Product AUX input to make current transfers up to 20 A (see
Figure 4-4). The Product AUX Input is internally terminated with a 90 Ω resistor
that allows for direct connection to current shunts. Connection to A40 and A40A
Current Shunts requires the 5790A-7001 accessory which consists of an adapter
and cable. The cable is approximately 36 inches long and has a male terminal
plug on one end and a UHF (M) connector on the other. This cable connects
between the Product AUX Input and the A40A Current Shunt or the adapter (see
Figure 4-3). The adapter has a UHF (F) connector on one end and one-inch
spaced female banana jacks on the other. This one-inch spacing allows for
connection to the A40 Current Shunt.
When the Product AUX Input is used, where the 90 Ω termination resistor is
internal to the Product, calibrate the Product as a system with the A40 or A40A
Current Shunts. Fluke Calibration recommends that the Product and the 792A-
7004 adapter be used on INPUT 1 (and not the AUX input) for ac/dc current
calibration when better uncertainties are necessary.
To use the AUX input:
1. Connect the 5790A-7001 adapter cable to the AUX and INPUT 2 LO binding
posts.
2. Connect the 5790A-7001 adapter to the 5790A-7001 adapter cable.
3. Connect a A40 Current Shunt to the 5790A-7001 adapter.
4. Connect a A40A Current Shunt to the 5790A-7001 adapter using an
A45-4004 cable.
5. Push AUX so that “Aux” is shown in the upper corner of the display.
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