HD-1250
Figure
2-3
Page
45
ABSORPTION WAVE METER MODE OF OPERATION
CAUTION:
When
you
use the Dip Meter near
energized RF
circuits, start with
the Dip
Meter
some reasonable
distance away from
the circuit to avoid
overdriving the
meter circuits.
Adjust
the Dip
Meter in the
following manner:
1
. If possible,
select
a
coil whose
frequency range will cover that of the
unknown
circuit. For
example, the IF frequency in FM
circuits will
be at or
near 10.7
MHz. If the circuit under test
were in
a
stereo IF
circuit, logically the
yellow coil would
be used
to
make the test,
since
the range of the
coil is
6.3 to
13
MHz. Plug the coil into the
coil socket.
2.
Press
the
pushbutton to turn the
Dip Meter On.
3.
Turn the OSC
LEVEL control to
obtain
a
midscale reading on
the
meter.
4. Turn
the tuning dial from one
extreme to the
other and note the
taper
of the reading at both
ends
of
the dial. Select the
very highest
reading possible;
then leave the
tuning dial
set at
that point.
5.
Carefully turn the OSC
LEVEL control to
reduce the meter
reading
just to the zero
point. Leave the OSC LEVEL
control at this setting.
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