Caution In Motor Pointer Deflection Change; Applications; Use As A Dip Meter - Kenwood DM-81 Manual

Caution in Motor Pointer Deflection Change

The meter pointer may swing slightly as if indicating a dip, This results from a variation
in oscillation signal strength while tuning the oscillator variable capacitor. Move the dip
meter coil away from the circuit under measurement. The meter pointer will return to full
scale for a real dip.

APPLICATIONS

Use as a Dip Meter

1. Select an oscillation coil covering the desired frequency range.
2. Install the coil into the socket on top of the dip meter.
3. Set the FUNCTION switch to "OSC".
4. Turn the power on.
5. Turn the SENSITIVITY control until the meter pointer reads at division 0.7. If not to
division 0.7, turn the control fully counter-clockwise.
6. Bring the dip meter coil about 1 cm from the tuned circuit to be measured and slowly
turn the dial. The oscillator signal energy will be absorbed by the tuned circuit at the
resonant point and the meter will dip abruptly. See Figure 3.
Note: At first, couple the dip meter coil tightly to the given tuned circuit so that you
can easily find the dip point. Then, bring the oscillation coil away until the dip is as
narrow as possible, and readjust the dial precisely for an accurate dip point. Now read
the correct frequency on the dial.
KENWOOD DM-81
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