Calibration-475
34. Check Triggering
a. High-frequency triggering:
Internal
40 MH
200 MHz
AC
0.3 div
1.5 div
LF REJ
0.3 div
1.5 div
DC
0.3 div
1.5 div
External
AC
50 mV
250 mV
LF REJ
100 mV
500 mV
DC
50 mV
250 mV
Multiply by 10 for EXT -r 10 sensitivity.
HORIZONTAL SYSTEM CALIBRATION
37. Adjust Delay Start and Delay Stop
a. A TIM E /D IV to 1 ms,
B TIM E /D IV to 5 jus,
HORIZ DISPLAY to A INTEN,
B SOURCE to STARTS AFTER DELAY,
DELAY TIM E POSITION to 1.00.
b. Use 1 ms time markers.
c. ADJUST—Delay Start, R938, to intensify the left side
b. HF REJ—Triggers on 0.3 division at 50 kHz; does not Qf the 2nd time marker,
trigger at 1 MHz.
c. LF REJ—Triggers on 0.3 division at 50 kHz; does not
trigger on 60 Hz.
d. Check SINGL SWP operation and READY light.
e. Check A NORM triggering.
f. Check LINE triggering.
g. Check AUTO recovery time.
35. Check External LEVEL Range
a. EXT: at least ±2 V (4 V P-P) for both A and B.
b. EXT -T- 10: at least ±20 V (40 V P-P) for A only.
36. Adjust TRIG VIEW
a. ADJUST—Trigger View Centering, R673, so trace is at
center horizontal line, within 1 division.
b. Connect 200 mV square-wave signal from Standard
Amplitude Calibrator to A External Trigger input.
c. Check for 3.2 to 4.8 divisions of display with TRIG
VIEW in.
d. DELAY TIME POSITION to 9.00.
e. ADJUST—Delay Stop, R936, to intensify the left side
of the 10th time marker.
f. HORIZ DISPLAY to B DLY'D.
g. DELAY TIME POSITION to 1.00.
h. ADJUST—Delay Start, R938, so the 2nd time marker
starts at the beginning of the sweep.
i. DELAY TIME POSITION to 9.00.
j. ADJUST—Delay Stop, R936, so the 10th time marker
starts at the beginning of the sweep.
38. Check Differential Time Accuracy
a. Accuracy within 0.01 division from +15°C to +35°C.
b. Accuracy within 0.02 division from —15°Cto +55°C.
39. Adjust Horizontal Gain
a. HORIZ DISPLAY to A,
both TIM E /D IV to 1 ms.
b. Use 1 ms time markers.
®
5-19
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