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Alternate Procedure
23. Analog-To-Digital Converter Adjustments
1. Adjust A3A8R5 GAIN for a square wave displayed on the
oscilloscope. The square wave should be approximately 4 V,,.
See Figure 3-86 for location of adjustment.
4. Procedure without using Low-Noise DC Supply:
a. Press
b. Key in TRACE A [BLANK] and SWEEP (SINGLE).
c. Disconnect cable 0 (black) from sweep ramp input A3A8Jl.
d. Short A3A8TP4 to A3A8TP5 or connect SMB snap-on short to
e. Connect DVM to A3A8TPll and ground to A3A8TP4. Set DVM
for V ac.
f. Adjust A3A8R6 OFFS until
maximum ac voltage as indicated by the DVM (approximately
2.0 V ac). See Figure 3-86 for location of adjustment.
g. Remove short from A3A8TP4 and A3A8TP5. Reconnect cable 0
(black) to A3A8J 1.
h. Press
PRESET
i. Connect DVM to A3A8TP5 and ground to A3A8TP4. Set DVM
for V dc.
j. Press SWEEP C-1. Note DVM reading at end of the sweep.
The voltage will begin to drift immediately after the sweep
ends. Therefore, the first indication after the sweep ends is the
valid indication. It may be helpful to press [SINGLE) several times
to ensure a valid indication at the end of the sweep.
k. If DVM indication is + 10.020 f0.005 V dc at
sweep, no further adjustment is necessary. Otherwise, adjust
the sweep is + 10.020 fO.005 V dc.
level at A3A8TPll is at a
the
].
end of the
the
Adjustments 3-141
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