Kenwood DM-81 Manual page 11

KENWOOD DM-81
The dip point can be obtained by using the ground clip and probe for frequencies
of about 50MHz or lower, and the probe only for about 5OMHz and higher.
Toroidal coils can be measured in the same manner. Note that the probe should be
connected to the hot side (not the ground side) of the circuit. See connections (a)
through (e) in the illustration. The dip point is sometimes critical depending on
the circuit or frequency to be measured. An accurate dip point can be obtained by
turning the dial slowly.
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