TB 9-4931-506-24
(2) Set TEST switch to VERT OR HORIZ GAIN and rotate POSITION control
throughout its range. Trace on oscilloscope will move at least 1 division.
(3) Set TEST switch to VERT OR HORIZ STEP RESP +, VERT OR HORIZ
STEP RESP-, VERT OR HORIZ FREQ RESP and VERT OR HORIZ STEP AUX IN
positions. At each position, rotate POSITION control throughout its range and observe
that oscilloscope trace moves at least 4 divisions.
b. Adjustments. No adjustments can be made.
9. Step Amplitude
a. Performance Check
(1) Set TEST switch to VERT OR HORIZ STEP RESP + and AMPLITUDE
control fully cw. Step on oscilloscope display will be at least 8 divisions.
(2) Set AMPLITUDE control fully ccw (counterclockwise).
Oscilloscope display
will not have a step.
b. Adjustments. No adjustments can be made.
10. Pulse Repetition Rate
a. Performance Check
(1) Adjust AMPLITUDE control for a 4 division step on oscilloscope.
(2) Press 1 MHz REP RATE pushbutton and set time base MAIN SEC/DIV
switch 0.2 s. Oscilloscope will display 1 cycle between 4 and 6 divisions horizontally.
(3) Repeat technique of (1) and (2) above for REP RATE and time base MAIN
SEC/DIV switch settings as listed in table 5. Oscilloscope will display 1 cycle between 4
and 6 divisions horizontally.
Table 5. Pulse REP RATE
Test instrument
Time base
REP RATE
MAIN SEC/DIV
switch settings
switch settings
2 s
100 kHz
20 s
10 kHz
0.2 s
1 kHz
2 s
100 Hz
b. Adjustments. No adjustments can be made.
11. Gain Accuracy
a. Performance Check
(1) Set TEST switch to VERT OR HORIZ GAIN and press REP RATE 1 kHz pushbutton.
(2) Set oscilloscope POWER switch to off.
(3) Remove U180 (fig. 1) and insert stepper circuit switch in its place.