Tektronix 3A74 Calibration Procedure page 7

PRELIMINARY INSPECTION
Install current modifications.
2. PRESET TYPE 3A74
Set front panel controls all channels:
POSITION midr
VOLTS/DIV 0.2
VAR GAIN CAL (in detent).
AC-DC~—GND DC
MODE OFF
TRIGGER CH 1 ONLY PULL Pushed in
CHOP ALT ALT
DC BAL midr
GAIN ADJ midr
3. RESISTANCE CHECKS
a. Ftlament reststance:
With an ohmmeter, on 12 range, check
resistance to ground on interconnect-
ing plug-in. Pin 1 70.52 and Pin
b. Cheek protection dtodes
Use the ohmmeter to check the protection
diodes in the plug-in for shorts
and opens.
4, SET-UP
Preset Plug-in Scope and TYPE 2B67 and
POSITION Centered
MODE NORM
TIME/DIV .lmSEC
VARIABLE TIME/DIV CALIBRATED
(full cw)
SLOPE +
COUPLING AC SLOW
SOURCE INT
LEVEL FREE RUN (all cw)
PULL 5X MAG Pushed in
NOTES
it will burn up the filament
cable when the TYPE 3A74 is
put into the cycle racks.