Tektronix TCPA300 - Figure 16: Adding a Second Conductor; Figure 17: Adding Multiple Turns

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Reference Notes

Figure 16: Adding a second conductor

NOTE. Adding a second conductor to the probe increases the insertion impedance

and reduces the upper bandwidth limit of the probe.

You can increase the value of the bucking current by winding multiple turns of the

second conductor around the probe, as shown in the illustration. (See Figure 17.)

Figure 17: Adding multiple turns

The bucking current is equal to the current ﬂ owing in the conductor, multiplied

by the number of turns wound around the probe. For example, if the second

conductor has a current of 100 mA DC and is wrapped around the probe ﬁve

times, the DC bucking current is 100 mA multiplied by 5, or 500 mA DC.

To determine measurement values, add the value of the bucking current to the

displayed measurement.

NOTE. Winding multiple turns to the probe increases the insertion impedance and

reduces the upper bandwidth limit of the p robe.

TCPA300/400 Ampliﬁers and TCP300A/400 Series Current Probes User Manual 33

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