
3. Preliminary Display Adjustments (SN 3004A and Above)
12. Set the oscilloscope controls as follows:
Press
m):
Channel 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.on
amplitude scale . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10.0 V/div
offset
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
..25.OOOOV
Channel 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . on
amplitude scale . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10.0
V/div
offset
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
..6O.OOOOV
Press (TRIG):
source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
..l
level
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25.0000 V
Press
@KKK]:
time scale . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.50.0
ns/div
delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125.000 ns
Press
(jjj:
connect dots . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
..on
Press
m.
13. Set the spectrum analyzer front-panel INTENSITY control fully
counterclockwise, and then set the LINE switch to ON.
14. The X+ deflection and X- deflection waveforms should be
superimposed on the oscilloscope display, as shown in Figure 3-26.
If necessary, adjust AlA2R227 X POSN and AlA2R220 X GAIN
for a centered display of at least four vertical divisions. See
Figure 3-25 for the location of the adjustments.
:
..~.-.-........................-...............................................
”
.,..,..._.._.....,..
...”
,,,.., ,,,..,,.,...,..,,...,...,.,..,..~.,.....~..~..~......
i
!I
10.0 V/diV
‘T
/
.+
!
I
'Y"
.j.
.i.
.:.
:
..__................_................._...
1..
.._..............................................-~...................
i
-125.000
ns
125.000 "s
50.0
ns/div
375.000
ns
1
f
25.00 v
Figure 3-26. X+ and X- Waveforms
15. Set the oscilloscope controls as follows:
Press
CWFORM
rani]:
fl ............................................................
on
display
.......................................................
on
math
....................................
channel 1
-
channel 4
sensitivity
.........................................
..25.0V/di
v
16. Three waveforms should be displayed on the oscilloscope, as
shown in Figure 3-27. The lower composite waveform represents
Adjustments 3-59
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