TB 9-4931-503-24
CAUTION
High intensity will damage oscilloscope crt.
Adjust
INTENSITY control to lowest possible level consistent with
suitable display.
8. External Horizontal Gain
a. Performance Check
(1) Connect oscilloscope calibrator SOURCE/MEASURE CHAN 1 to TI EXT
HORIZ AMPL.
(2) Set oscilloscope calibrator VOLTAGE output for 0.5 V, 1 kHz.
(3) Adjust TI POSITION control to position dots to extreme right and left vertical
graticule lines.
(4) Adjust dual trace amplifier CH 1 POSITION control to vertically center the dots.
(5) Adjust oscilloscope calibrator EDIT FIELD knob for 10 divisions of horizontal
deflection on oscilloscope. If oscilloscope calibrator err display does not indicate within
3%, perform b below.
b. Adjustments Adjust oscilloscope calibrator EDIT FIELD knob for a 0.0% err
display indication. Adjust R52 EXT HORIZ GAIN (fig. 1) for a 10 division horizontal
deflection on oscilloscope (R).
Figure 1. Test instrument A board - left-side view.