V ARIABLE VOLTS/CM
full right (cw)
(A and B)
the trace is within 2 cm of the vertical-system
electrical center.
P O L A R IT Y (A and B)
NORMAL
AC-DC (A and B)
DC
DC B A L (A and B)
m id-range
With the MODE switch back in the ALTE R -
N ATE Position measure the voltage from pin
1 or 3, of the 16 pin interconnecting plug,
to ground.
This voltage should be between
66.5 volts and 68 volts.
MODE switch
ALTE R N A TE
6. Check for Gas and Microphonics
2. Balancing Output Stage
Connect a shorting strap between pins 1
and 3 of the 16-pin interconnecting plug. Note
the vertical level of the trace. What you have
just found is the vertical-system electrical
center of the oscilloscope.
Now connect the shorting strap between pins
2 and 7 of V4383. The trace should now fall
within 2 cm of the vertical-system electrical
center just observed
If it doesn’t, select a
new tube fo r V4383 which w ill bring it within
this tolerance.
3. Adjusting DC BAL (R3341 and
R4341)
Position the trace of each channel to the
center graticule line.
Now while rotating
the V ARIABLE VOLTS/CM control through
its complete ränge, adjust the DC B A L so
that the trace w ill remain stationary. This
must be done to each channel.
4 .
Vertical Position Range
Adjustment (R4376)
Set both of the V E R TIC AL POSITION Controls
to mid-range. Adjust the Vert. Pos. Range
adjustment so that the two traces w ill be
equidistant above and below the vertical-system
e lectrica l center found in step 2.
5. Checking P O L A R IT Y Switch
Gas check: With the input connectors grounded
turn the AC-DC switches from DC to AC
and observe the vertical drift of the traces.
This drift should not be m ore than 2 m illi-
m eters.
Microphonic check:
Rap the Type CA Unit
lightly on the front panel and watch for the
excessive ringing type of microphonics.
7. Check for Proper ALTER NATE
CHOPPED Operation
Reset the oscilloscope's TIME/CM control
to .1 SEC and with the plug-in MODE switch
in ALTE R NATE ,Position the two traces about
2 cm apart. Check to see that each time the
sweep is triggered the trace alternates between
A and B channels.
F or the CHOPPED check set the TIME/CM
switch on the oscilloscope to 10 m icrosec and
the plug-in MODE switch to CHOPPED. Observe
that the wave form should be approximately
flat on the top and bottom.
8. G AIN A D d. (R3356 and R4356)
Set oscilloscope as follows:
TIME/CM
1 MILLISEC
AM PLITUDE
.1 VO LT
C AL IBRATOR
With the MODE switch in
ALTE R N ATE
Position the traces to the center of the CRT.
Now
switch the P O L A R IT Y switches from
NORMAL to INVERTED. The traces should
not shift m ore than one centimeter.
Set the Type CA as follows:
MODE
ALTERNATE
VOLTS/CM ( A and B)
.05
Switch
the
MODE
switch
to ADDED
A LG E B R A IC A LLY and the P O L A R IT Y switches
to NORMAL. Position the V E R T IC A L POSITION
Controls to mid-range and check to see that
V ARIABLE VOLTS/CM
full right (cw)
(A and B)
AC-DC (A and B)
DC
AA
Calibration - Type CA
5-3
Summary of Contents for CA PLUG-IN
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