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Application E xamp les

For a more precise turns count, you need a

coil with a known number of turns to use as a

reference. Do the following:

1. Repeat steps 1 and 2 above and make the

following changes:

2. Insert the reference coil into the curre nt

probe.

3. Insert the test coil into the current probe

so that the currents oppose each other

as shown. You m ust observe the polarity

of coil current to determine whether the

test coil has less or m ore turns than the

reference coil. The turns are calculated by

using the formula:

where:

is the number of turns in the test coil,

is the number of turns in the reference

coil,

is the measured coil current, and

is the input current.

18 TCP0030 Current Probe Instruction Manual

Tektronix TCP0030 User Manual

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