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22. Analog-To-Digital Converter Adjustments
d. Connect the oscilloscope channel 1, 10: 1 probe to A3A8TPll
and ground the probe ground to the A3 section's card cage.
e. Set the oscilloscope settings as follows:
Press (CHAN)
Channel 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . on
probe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..lO.l
amplitude scale . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 V/div
offset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...2 V
coupling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..dc
Press (TRIG)
EDGE TRIGGER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . auto, edge
source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..Channell
Press (TlME)
time scale . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...5 @div
Press Display
connect dots . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . on
Press (SHOW)
f. Adjust A3A8R6 OFFS for a square wave displayed on the
oscilloscope. The square wave sould be approximately 4 V,,.
See Figure 3-101 for location of adjustment.
g. Remove short from A3ASTP4 and A3A8TP5 or disconnect the
SMB snap-on short from A3A8Jl.
h. Press CO-2.5).
i. Press MARKER @ZZZZ), 1498 (MHz), and (=I (SINGLE) ".
j. Connect DVM to A3A8TP5 and ground to A3A8TP4. Set DVM
for V dc.
k. Connect output of the Low-Noise DC Supply to A3A8Jl. Adjust
the Low-Noise DC Supply for DVM indication of + 10.000
1. Adjust A3A8R5 GAIN for a square wave displayed on the
oscilloscope. The square wave sould be approximately 4 V,+,.
See Figure 3-101 for location of adjustment.
m. Disconnect low-noise dc supply from A3A8Jl. Reconnect 0
cable to A3A8J 1.
Adjustments 3-207
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