TB 9-6625-1962-24
7. Equipment Setup
HIGH VOLTAGE is used or exposed during the performance of
this calibration.
DEATH ON CONTACT may result if
personnel fail to observe safety precautions.
REDUCE
OUTPUT(S) to minimum after each step within the
performance check where applicable.
a. Remove left side shield from TI and left side panel from indicator oscilloscope for
adjustments.
b. Install TI in left vertical plug-in compartment of indicator oscilloscope.
c. Connect indicator oscilloscope to autotransformer. Connect autotransformer to a
115 volt ac (alternating current) source and adjust output to 115 volts.
d. Set indicator oscilloscope to on and allow at least 20 minutes for warm-up
and stabilization.
e. Set MODE/RANGE switch to DC VOLTS 2V.
NOTE
All references to DC VOLTS positions of MOD/ RANGE
switch pertain to those associated with the INPUT terminals
(orange front-panel tint). Any controls not mentioned for the
indicator oscilloscope may be set as desired.
f. Adjust indicator-oscilloscope INTENSITY and READOUT controls to obtain a
usable readout display.
g. Adjust indicator oscilloscope FOCUS and ASTIGMATISM controls as necessary for
well defined characters in oscilloscope display.
NOTE
For model 7D13 perform steps 7 h and 7 i only. For 7D13A
perform only steps 7 j only.
h. Set MODE/RANGE switch to DC CURRENT 2mA. If indicator oscilloscope
readout display does not indicate 0.000 0.002 mA (milliamperes), position indicator
oscilloscope on its right side and remove bottom cover.
i. Adjust R115 ZERO ADJ (fig. 1) to obtain indicator oscilloscope readout display of
0.000. Best adjustment is obtained when readout display just changes from -0.000 to +0.000.
j. Short input terminals. If indicator oscilloscope readout display does not indicate
0.000 0.001, perform power supply check.