
24. Digital Storage Display Adjustments
X
and
Y
Offset
and
24.
Gain
Adjustments
25.
26.
27.
28.
29.
30.
31.
32.
33.
34.
35.
36.
37.
38.
39.
40.
Press
(2-22].
Key in (FREQUENCY SPAN] 0 Hz, [SWEEP TIME] 100
ps.
Disconnect cable 9 (white) from
A3A9J2
and connect to
A3A2J2
LG/FS
test connector on
A3A2
Intensity Control; the other end of
the cable remains connect connected to A3A2Jl.
Select TRIGGER (VIDEO) and adjust front-panel LEVEL control for
a stable display on instrument CRT.
Adjust A3AlR34 SWP OFFSET so that the signal trace begins at
the left edge graticule line. Refer to Figure 3-105 for location of
adjustment.
Adjust
A3A3R4
X GAIN for twenty cycles displayed on the
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 twenty-first cycle being centered on the
right edge graticule line. A3AlR34 SWP OFFSET must then be
readjusted so that the trace begins at the left edge graticule line.
See Figure 3-105. for location of adjustment.
Remove the cable 9 (white) from
A3A2J2
LG/FS
test connector
and reconnect to
A3A9J2.
Remove cable 7 (violet) from
A4AlJl.
Short
A3A9TPl
to
A3A9TP3
or connect an SMB snap-on short to A3A9Jl.
Connect DVM to
A3A9TP3
and DVM ground to A3A9TPl.
Press LIN pushbutton.
DVM indication should be 0.000 f0.002 V dc.
Adjust
A3A3R43
YOS to align the bottom graticule line with the
fast sweep signal trace.
Remove the short between
A3A9TPl
and
A3A9TP3
(or the SMB
snap-on short) and reconnect cable 7 (violet) to
A4AlJl.
Key in [CENTER FREQUENCY) 100 MHz. Connect CAL OUTPUT to RF
INPUT. Press LOG [ENTER dB/DIv) 10
dB.
Connect the DVM to A4AlTP3 and the DVM ground to the IF
casting.
Press (REFERENCE LEVEL) and adjust DATA knob and the frontpanel
AMPTD CAL adjust for DVM indication of +2.000 f0.002 V dc.
Adjust
A3A3R5
Y GAIN to align the top graticule line with the
fast sweep signal trace.
3-216 Adjustments
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