Probing Principles
Extending DC Range
If you want to measure a low-amplitude AC component that is superimposed on an extremely large steady-state DC component
(such as in a power supply), or if you want to extend the DC current range of your probe, you can add offset (bucking) current with
a second conductor.
WARNING. Do not put more than one uninsulated conductor at a time in the prob e jaws. An uninsulated conductor is any
conductor w ithout insulation or without insulation rated for the voltage present on the conductor under test.
To supply additional bucking current:
1. Place a s econ d conducto r that has a pure
DC component of known value in the probe
jaw with the cond uctor und er test.
2. Orient the second conductor so that the
bucking current flows in the opposite
direction of the DC flow in the conductor
under test.
3. To determine mea surement values, add
the value of the bucking current to the
displayed measurement.
30 TCP0030 Current Probe Instruction Manual
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