16.
High
Frequency
Rejection
Check
Remove the Type 190 and the 5XT from the
A
channel vertical input connector. Install the
Dual
Input
Connector on the Type
CA
Unit
and
then reinstall the 5XT and the Type 190
on
Its connector.
A
djust the Type 190 to obtain an output fre
quency of 50 kc and an output amplitude of one
volt, as
read on the meter
of the Type 190.
Now without changing the output
amplitude of the
Type
190,
increase the frequency of the Type
190 to 24 mc.
Turn the
MODE switch to ADDED ALGEBRAI
CALLY
and switch the POLARITY switch of
A channel to INVERTED. With the waveform
positioned to the
vertical system electrical
center a
cancellation of the signal, within 1 cm,
should
occur. If the cancellation just described
doesn’t take place try returning the A channel
POLARITY switch to NORMAL and changing
the
B channel POLARITY
switch to INVERTED.
The
plug-in
is
satisfactory if either condition
will
permit proper cancellation of the signal.
Now
position
both the AC-DC switches to
AC
and check to see that you
have cancel
lation
of the signal
within one centimeter.
Fig.
5-3.
Left side view of Type CA Unit showing iocation of adjuatmenti*.
5-6
Calibration
-
Type CA
AA
