TB 9-6625-2118-24
Table 5. Delay Time Accuracy
Test instrument
Oscilloscope
Maximum DELAY
DELAY TIME
calibrator
TIME POSITION
POSITION
TIME/DIV
A TIME/DIV
B TIME/DIV
control error at
control
switch
switch settings
switch settings
setting near 9.0
reference
settings
(minor divisions)
position
20 ns
1 ns
2.0
7
20 ns
50 ns
1 ns
1.0
4
50 ns
1 s
1 s
10 ns
1.0
4
50 s
.5 s
50 s
1.0
4
10 s
1 ms
1.0
4
1 ms
20 s
2 ms
1.0
8
2 ms
20 ms
.2 ms
1.0
8
20 ms
b. Adjustments
(1) Adjust DELAY START ADJ R918 (fig. 1) until A trace intensified portion is on
second time mark and pulse on B trace just starts positive at beginning of trace.
(2) Adjust DELAY STOP ADJ R925 (fig. 1) until A trace intensified portion is on 10th
time mark and pulse on B trace just starts positive at beginning of trace.
(3) Repeat a (3) and (4) above.
(4) Adjust C882 (fig. 1) until time mark on B sweep is aligned with second vertical
graticule line (R).
(5) Adjust C1248 (fig. 1) until TI B sweep timing matches the A sweep timing (R).
(6) Adjust C877 (fig. 1) until B display is at reference position established in a (12)
and intensified zone of A display starts on 10th time mark (R).
(7) Repeat a (12) and (13) above.
(8) Adjust C1242 (fig. 1) until display has 1 time mark per division over center 8
divisions (R).
(9) Repeat a (14) and (15) above.
11. CH 1 and CH 2 50
Gain
a. Performance Check
(1) Position controls as listed in (a) through (f) below:
(a) CH 1 and CH 2 VOLTS/DIV switches to 20 mV.
(b) Input switches to DC.
(c) SWEEP MODE switch to AUTO TRIG.
(d) TIME/DIV switch to .5 ms.
(e) HORIZ DISPLAY A pushbutton pressed.
Adjust CH 1 and CH 2 front panel GAIN to midrange.
(f)
(2) Connect oscilloscope calibrator to CH 1.
(3) Set oscilloscope calibrator for 200 mV at 1 kHz.
