Probing Principles
Probing Principles
The following inf ormation is provided to help you use the full potential of your current probe.
Degaussing a Probe with an Unpowered Conductor in the Jaws
You can degauss your current probe while a con ductor of an unpowered circuit is clamped in the jaws. The advantage of
degaussing with an unpowered circuit is that any offset from stray DC magnetic fields is compensated. Degaussing with the
conductor in the probe jaws eliminates the need to ma nually remove the probe.
NOTE. Be certain that the conductor in the probe jaws is completely unpowered. Any current flowing throu gh the conductor will
cause a residual offset in the current probe and may ca use an inaccurate measurement or an error condition.
The impedance of your circuit must be higher than 10 mΩ for the degauss procedure to work. (The probe core will not saturate with
a circuit impedan ce of less than 10 mΩ). While d egauss occurs, the probe will induce a 60 mV, 200 Hz signal in the unpowered
circuit. Your circuit must be able t o absorb this induced voltage. With low impedance circuits, several amperes may be induced in
the circu it being measured. This may be of concern when you are using very small conductors.
26 TCP0030 Current Probe Instruction Manual
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