Tektronix TYPE CA Instruction Manual page 20

Connect a jumper between the CAL OUT
connector of the oscilloscope and both of the
vertical input connectors of the Type CA Unit.
With .1 VOLT of calibrator applied to each
channel adjust the GAIN ADJ, of each channel,
for 2 cm of vertical deflection on the CRT.
9. Check Operation of AC-DC Switch
With all controls set as in
the bottom of the calibrator waveforms to the
center graticule line.
DC switch to AC. The
down so that the center graticule line will
now be approximately through the center of
the waveforms.
10. Check ADDED ALGEBRAICALLY
Position of
et plug-in controls to:
AC-DC (A and B)
MODE
With the same amount of calibrator signal
still applied as in step 9 check to see that
there is 4 cm of deflection on the crt.
Now apply one volt of calibrator signal from
the oscilloscope to each of the vertical inputs
of the Type CA Unit. Turn the A channel
POLARITY switch to INVERTED.
signals should now cancel each other out within
1 cm. You may adjust the VERTICAL PO ITION
controls to accomplish this cancellation. If
the cancellation just described doesn ' t take
place, reset the A channel POLARITY switch
to NORMAL and the B channel POLARITY
switch to INVERTED. Now check for proper
cancellation. The unit is satisfactory if either
condition will permit the proper cancellation
of the signal.
11. Checking VOLTS/C
Position
Reset the plug-in controls as follows:
MODE
POLARITY (A and B)
Connect a jumper from the CAL OUT con ­
nector of A channel of the plug-in. Check for
5-4
tep 8 position
Now switch the AC-
should shift
ODE Switch
DC
ADDED
ALGEBRA ­
ICALLY
The two
Swi t c h
ALTERNATE
NORMAL
Calibration - Type CA
the correct deflection in each position of the
VOLT /CM switch. Now remove the jumper
from A and connect it to B channel. Run
through the check on this channel as you did
on A channel.
Note
At the factory the accuracy of
the VOLT /CM switch is checked
with an AMPLITUDE CALIBRATOR
which employs 1/4%
resistors.
VOLT /CM
AMPLITUDE
w it ch
CALIBRATOR VOLT
.05 .2
.1 .2
.2 .5
.5 2
1
2
2 5
20
5
10 20
20 50
12. Adjust Input Capacitors (C3322
and C4322)
et the VOLT /CM switches of the Type CA
Unit to .05. Apply a 1 kc signal from the
Type 105 quare-Wave Generator to the Type
CA Plug-In, through the P52 cable, the 5XT
and capacitance standardizer. The capacitance
standardizer should be connected between the
P52 cable and the Type CA Unit with the 5XT
between the P52 cable and the capacitance
standardizer.
Attach the Type 105 to the A channel input
connector of the Type CA Unit and adjust
the Type 105 Output Amplitude for a deflection
of approximately 3.5 cm on the oscilloscope ' s
crt. Now adjust C3322 for optimum flat top
on the wave fo rm. Then connect the Type 105
to the B channel input connector of the Type
CA Unit and adjust C4322 for optimum flat
top.
13. Adjust VOLTS/C
Compensations
Maintain the same output frequency and
amplitude from the Type 105 quare-Wave Gen ­
erator as in step 12. Remove the capacitance
standardizer from the P52 cable and install
VERTICAL CRT
DEFLECTION
4 cm
2 cm
2.5 cm
4 cm
2 cm
2.5 cm
4 cm
2 cm
2.5 cm
AA