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25. Digital Storage Display Adjustments
X and Y Offset and
Gain Adjustments 26,
20.
Connect oscilloscope to A3A3TP7.
21.
Adjust A3A2R51 Y S&H BAL for minimum dc offset between the
level of the signal inside the two pulses to the signal level outside
the two pulses.
22.
Set LINE switch to STANDBY.
Reinstall A3A3 Line Generator in instrument without extender
23.
boards.
24. Set LINE switch to ON.
25.
Press
Key in
[
FREQUENCY SPAN
27.
Disconnect cable 9 (white) from A3A9J2 and connect to A3A2J2
the cable remains connect connected to A3A2J 1.
Select TRIGGER [VIDEO] and adjust front-panel LEVEL control for
28.
a stable display on instrument CRT.
29.
Adjust A3AlR34 SWP OFFSET so that
the left edge graticule line. Refer to Figure 3-90 for location of
adjustment.
Adjust A3A3R4 X GAIN for twenty cycles displayed on
30.
CRT graticule. This may be made easier by adjusting A3AlR34
SWP OFFSET so that the first peak is centered on the left edge
graticule line, then adjusting A3A3R4 X GAIN for two cycles
per division with the twentieth cycle being centered on the
right edge graticule line. A3AlR34 SWP OFFSET must then be
readjusted so that
the
See Figure 3-90. for location of adjustment.
31.
Remove the cable 9 (white) from A3A2J2 LG/FS test connector
and reconnect to A3A9J2.
32.
Remove cable 7 (violet) from A4AlJl. Short A3A9TPl to
33.
Connect DVM to A3A9TP3 and DVM ground to A3A9TPl.
Press LIN pushbutton.
34.
DVM indication should be 0.000 kO.002 V dc.
35.
Adjust A3A3R43 YOS to align the bottom graticule line with
36.
fast sweep signal trace.
Remove the short between A3A9TPl and A3A9TP3 (or the SMB
37.
snap-on short) and reconnect cable 7 (violet) to A4AlJl.
38.
Key in
[
CENTER FREQUENCY
INPUT. Press LOG
(
39.
Connect the DVM to A4AlTP3 and
casting.
Press
40.
[
REFERENCE LEVEL
AMPTD CAL adjust for DVM indication of +2.000 50.002 V dc.
0 Hz,
100 ps.
]
[
)
SWEEP TIME
signal trace begins at
the
trace begins at the left edge graticule line.
20 MHz. Connect CAL OUTPUT to RF
)
10 dB.
ENTER
DVM ground to the IF
the
and adjust DATA knob and the frontpanel
)
the
the
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