Tektronix SCD1000 Service Manual page 198

I
I
1-
,
External Calibration
6. Adjust R705 and C705 on the Output board for best rise time with aberra-
tions less than
+
7%, -3%, and less than 12% peak-to-peak overall.
7. As before, adjust the following for square corner, flat top, aberrations less
than
+
7%, -3%, and less than 12% peak-to-peak overall as shown in
Figure 5-28. Do this by adjusting the following components on the Analog
board:
• R61 (A Thermal)
• R47 (A HF 1)
• R48
(A
HF
2)
• R49 (A HF 3)
• R50 (A HF D)
(
~
SCDDISPLAYUNIT
seD100o/SCD5000 Service Manual
CONTRAST
o
INCFllDECR
o
Figure 5-28: Output Adjustment
8. R50 may affect the channel A vertical gain adjustment. If you adjust ROO,
recheck the channel A vertical gain adjustment before proceeding further.
Then repeat the above adjustments in step 6 as necessary for the best
overall transient response.
9. Move the TD Pulser output to CH B input. Readjust the TRD trigger,d level
to the minimum level required for fast-rise output.
5-71