8588A/8558A
Operators Manual
68
Measure AC Current with ACI Ext Shunt
The ACI Ext Shunt function provides a calculated current reading for a specified
current shunt. The ACI Ext Shunt function is particularly useful for current shunts
that have corrections for ac-dc differences at different frequencies, like the Fluke
A40B series current shunts. Connections are shown in Figure 18.
Similar connection considerations are required to the external shunt inputs as for
ac current measurement. Use shielded twisted pair cable to reduce induced
interference signals, and connect GUARD to the source of common mode
voltage with the screen, to provide a separate common mode current path. Use
high-quality leads and connections to minimize the burden (compliance) voltage
generated for current measurements and thus, improving measurement
accuracy. Fluke Calibration recommends that leads of the minimum-practical
length be used to reduce lead capacitance, lead inductance, and loop area. The
external shunt sense terminals should be connected to the Product V INPUT HI
and LO terminals using shielded leads.
XW Warning
HIGH CURRENT FLOW
To prevent possible electrical shock, fire, or personal injury:
• Do not exceed the Measurement Category (CAT) rating of
the lowest rated individual component of a Product, probe,
or accessory.
• Only use probes, test leads, and accessories that have the
same measurement category, voltage, and amperage ratings
as the Product.
Note
When you make ac current measurements pay close attention to the
lead impedance, especially lead capacitance at high frequencies on
the lower current ranges. (See Measure AC Voltage)
DCI Ext Shunt
F
HI
LO
Vo l t a g e
output
FM
UHF UHF
Low Thermal Leads
iei105.emf
Figure 18. ACI Ext Shunt
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