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Application Examples

For a more precise turns count, you need a

coil with a known number of turns to use as a

reference. Do the following:

4. Repeat steps 1 and 2 and the n make the

following changes:

5. Insert the reference coil into the current

probe.

6. Insert the test coil into t he current probe

so that the currents oppose each other

as shown. You m ust o bserve the polarity

of coil current to determine whether the

test coil has fewe r or more turns tha n the

reference c oil. The turns are c alculated by

using the formula:

where:

N

2

is the number of turns in th e test coil,

N

1

is the number of turns in th e reference

coil,

I

m

is the measured coil current, and

I

1

is the inpu t current.

TCP0150 C urren t Probe Instruction Manual 23