Model
3720A
1.
2.
3.
4.
5.
2
1
27 26 25
28
29
30
3
4
5
6
7
8
9
10
1'1
1'2
13
14
1'5
16
ii
is
21
31
24
23
22
DISPLAY:
8
y
10 division CRT, with graticule
calibrated
in
one division squares. Major axes cali-
brated
in
0.2
division intervals.
1
division
=
0.95cm.
6.
STORAGE TIME:
potentiometer. Varies the time
any display is stored, when
in
STORE mode.
DISPLAY SENSITIVITY:
illuminated digital readout.
Scales the horizontal and vertical axes and the fre-
quency ..interval,
Af,
as selected by Scale Factor
switch.
SCALE FACTOR:
lever switch. Selects axis calibra-
tion to be presented on the Display Sensitivity panel.
ERASE:
pushbutton. Eradicates all traces displayed
on storage CRT screen, when not
in
STORE mode.
INTENSITY:
potentiometer. Controls brightness of
CRT
beam.
7.
8.
9.
10.
FOCUS:
potentiometer. Adjusts sharpness of CRT
beam.
PERSISTENCE:
potentiometer. Controls duration of
written trace, when not
in
STORE mode. Fully
clockwise position selects STORE mode.
INPUT:
lever switch. Routes data from the 3721A
into Store 1 or
2
as selected.
In
HOLD
position retains
data
in
stores.
LINE-ON:
toggle switch. Controls ac supply to
the
instrument.
Figure
1-2
Front panel controls and indicators
L
1-2
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