Tektronix TYPE CA Instruction Manual page 22

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 m c .
Turn the MODE switch to ADDED ALGEBRAI ­
5-6
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Fig. 5-3. Left side view of Type CA Unit showing iocation of adjuatmenti*.
Calibration - Type CA
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.
AA