Reference Notes
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
3-9
Conductor
under test
Bucking current
supplied by
second conductor
Extra turns added
to increase
bucking current
Conductor
under test
Current
Current
Current
Current
(a) Adding a second conductor (b) Adding multiple turns
Current probe
Current probe
Figure 3- 5: Increasing the DC measurement range
You can extend the AC amplitude limit of the TCPA300 by using the Tektronix
CT-4 High-Current Transformer. The CT-4, designed for use with the TCP305
and TCP312 current probes, extends the current probe range by a factor of 20:1
or 1000:1. The CT-4 can provide external steady-state DC bucking current up to
300 A. For more information about the CT-4, consult your Tektronix sales
representative.
Because the CT-4 has a lower AC bandwidth limit than the TCP305 and TCP312
current probes, set the amplifier coupling to DC when using the CT-4.
Extending AC R ange
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