TB 9-6625-2173-24
d. Connect power module to 115 V ac source and set POWER switch to on and allow at
least 20 minutes for warm-up.
e. Adjust INTENSITY and FOCUS controls for a sharp, well-defined display on TI.
f. Press AC COUPL pushbutton in for AC and adjust vertical POS control to center
trace on horizontal graticule line.
g. Rotate vertical VARIABLE control from X1 to X10 and note position of trace on crt.
Return vertical VARIABLE control to X1 position. If trace shifts more than 0.5 minor
division, adjust R142 (bal) (fig. 1) for less than 0.5 minor division of shift when the vertical
VARIABLE control is adjusted from X10 to X1.
8. Input Compensation
a. Performance Check
(1) Connect oscilloscope calibrator SOURCE/MEASURE CHAN 1 to TI VERT
INPUT using the 5-80 pF standardizer.
(2) Set TI vertical VARIABLE control to X1.
(3) With the 100 mV and the 1 V pushbuttons in the out 10 mV/DIV position, set
oscilloscope calibrator VOLTAGE output for a 1 kHz, 4 division display on the TI crt.
(4) Adjust TI TRIGGER LEVEL control for a triggered stable display and
adjust 5-80 pF standardizer for best square wave display. If TI does not display flat top,
perform b (1) below.
(5) Press 100 mV pushbutton in and rotate oscilloscope calibrator EDIT FIELD
knob for 4 division display. If TI does not have a flat top, perform b (2) below.
(6) Press 1 V pushbutton in and rotate oscilloscope calibrator EDIT FIELD knob
for 4 division display. If TI display does not have a flat top, perform b (3) below.
b. Adjustments
(1) Adjust C117 (fig. 2) for optimum square wave (flat top and square corners).
(2) Adjust C104 and C102 (fig. 2) for optimum flat top and square front corners.
9. Vertical Gain
a. Performance Check
(1) Release both 1V and 100 mV pushbuttons out for 10 mV/DIV.
(2) Remove 5-80 pF standardizer from setup and reconnect oscilloscope calibrator
SOURCE/MEASURE CHAN 1 to TI VERT INPUT.
(3) Set oscilloscope calibrator VOLTAGE output to 50 mV, 1 kHz.
(4) Rotate oscilloscope calibrator EDIT FIELD knob to obtain a 5 division vertical
display on TI. If oscilloscope calibrator err display readout does not indicate within r3%,
perform b (1) below.