Tektronix 3A74 Calibration Procedure page 6

14.
eu
15.
16.
18.
20.
Check chopped period: 1.4us to
display
Check for continous trace with
Adjust GAIN (R436)
at least + and
. Check operation of AC-DC-GND switch
Check VOLTS/DIV accuracy: within 27
channel operation: less than 2%
Adjust DC levels: Composite, R530
CH 1 ONLY, R521
Check trigger amplitude (both trig-
gers): AC-coupled, at least 2.5V/
Composite, 0.35usec or less
2.5/div of
21. CHANNEL ISOLATION
Check for at least 30,000:1 re-
jection of intra-channel signals
22. HIGH FREQUENCY COMPENSATION
Adjust HF Peaking (L464, L474):
max aberration, 2% P-P
23. CH 1, 2, 3, 4 BANDWIDTH
b. Check bandwidth:
<2Hz (AC-coupled) to >2MHz
THE END