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MEASURING CURRENT WITH AN EXTERNAL CURRENT SHUNT
NOTE: This function may not be compatible with all scan tools. Please verify its compatibility before using it.
WARNING:
This measurement mode is capable of measuring currents of many orders of magnitude larger than is typically possible with a
handheld meter. Exercise caution while interfacing high ampacity circuits.
NOTE: The accuracy of this measurement mode depends on the
accuracy of the external current shunt used. Account for this ac-
curacy dependency in your measurements.
The Ω terminal can measure small voltages, with a resolution of as
fine as 25nV per count and a noise floor as low as 1µV. This can be
used to with external current shunts to measure currents over a very
wide dynamic range. See the ratings section to guide shunt size
selection.
It is possible to use the existing wiring for the current shunt, and in
doing so take rough current measurements without breaking the
circuit.
With very low voltages it is recommended to minimize the loop area
of the measurement probes by either twisting them together or
using a BNC adaptor.
Basic Measurement Instructions
Measuring Current with an External Current Shunt
Figure 3: External Current Shunt
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