TB 9-6625-2083-24
b. Adjustments. No further adjustments can be made.
23. CH 1 and CH 2 High Frequency Compensation
a. Performance Check
(1) Set CH 1 VOLTS/DIV switch to 10 mV and A AND B TIME/DIV and DELAY
TIME switches to .1 s.
(2) Connect oscilloscope calibrator SOURCE/MEASURE CHAN 1 to TI CH 1
INPUT and SOURCE/MEASURE CHAN 2 to TI CH 2INPUT using 50
feedthrough
terminations.
(3) Set oscilloscope calibrator for a CHAN 1, EDGE mode output of 50 mV at 100
kHz, and rotate oscilloscope calibrator knob located below EDIT FIELD pushbutton for 5
divisions of vertical deflection. If square wave displayed does not have flat tops and square
corners, perform b below.
(4) Set TI A AND B TIME/DIV and DELAY TIME switches to 2 s.
(5) Set oscilloscope calibrator for a CHAN 2, EDGE mode output of 50 mV at 100
kHz, and rotate oscilloscope calibrator knob located below EDIT FIELD pushbutton for 5
divisions of vertical deflection.
(6) Repeat technique of (3) above, using switch settings listed in table 10.
(7) Repeat technique of (1), (3) and (4) above for CH 2.
b. Adjustments
(1) Perform adjustments listed in table 10 for optimum square wave (R).
(2) Repeat a above.
Table 10. CH 1 and CH 2 High Frequency Compensation Adjustments
Volts div
Test instrument
switch settings
Adjustments (fig. 6) (R)
CH 1
CH 2
Optimum flat top
Optimum flat top
and square corners
and square corners
1, C49F, R49G
1 C149F, R149G
10
mV
R44
R144
5 mV
C49A, R49A
C149A, R149A
1 C49H, R49H, C49J, C781
C1451, C149H, R149H, C149J,
20
mV
C45
C1502, C1781
C451, C49H, R49H, C49J
C1451, C149H, R149H, C149J
0.2
50 mV
C43, C49N, R49N, C60
C143, C149N, R149N, C160
0.5
C43, C49N, R49N, C60
C143, C149N, R149N, C160
0.1
C25
C125
1R44,
C45, and C78 affect all TI CH 1 VOLTS/DIV switch settings; and R144, R145, and C178 affect all TI CH 2VOLTS/DIV
switch settings. Adjust TI R44 and R144 for optimum display at 10 mV and 20 mV. Adjust TI C45 and C145 for optimum
display at 20 mV and 50 mV.
2SN B040000 and above.
24. Sweep Start and B Delayed Sweep Calibration
a. Performance Check
(1) Position switches as listed in (a) through (f) below:
