TB 9-6625-2083-24
Table 17. Low Frequency Compensation
Test instrument
Adjustments
Oscilloscope calibrator
TIME/DIV
EDGE output
switch settings
CH 1
CH 2
R1651
R3711
0.2 ms
1 kHz
s
R1721
R3731
10 kHz
20
s
R3211
R3211
100 kHz
2
R3191
R3191
1Adjust
R165, R172, R371, and R373 (fig. 9), and R319 and R321 (fig. 11) for best compromise between CH 1 and CH
Figure 11. Vertical output board.
39. CH 1 and CH 2 VOLTS/DIV Compensation
a. Performance Check
(1) Position controls as listed in (a) through (c) below:
(a) VERT MODE CH 1 pushbutton pressed and CH 2 pushbutton released.
(b) 20 MHz BW LIMIT pushbutton pressed to 20 MHz (in).
(c) A AND B TIME/DIV AND DELAY TIME switches to 0.2 ms.
(2) Connect oscilloscope calibrator SOURCE/MEASURE CHAN 1 to CH 1 input
and SOURCE/MEASURE CHAN 2 to CH 2 input through 50 feedthrough terminations,
attenuators, and standardizers.
(3) Set oscilloscope calibrator for a CHAN 1, EDGE mode output of 25 mV at 1
kHz, and rotate oscilloscope calibrator knob located below EDIT FIELD pushbutton for 5
divisions of display.
(4) Adjust standardizer for best square wave display. Display will be optimum
square wave without rounding or overshoot in excess of one-half minor division.
