Front Panel Controls And Indicators - HP 3720A Service Manual

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
i s
21
31
24
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22
DISPLAY: 8
y 1 0 division CRT, w i t h graticule
calibrated
in
one division squares. Major axes cali-
brated
in 0.2
division intervals.
1
division
=
0.95cm.
6.
STORAGE TIME:
potentiometer. Varies t h e 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 b y Scale Factor
switch.
SCALE FACTOR: lever switch. Selects axis calibra-
t i o n t o be presented o n the Display Sensitivity panel.
ERASE: pushbutton. Eradicates all traces displayed
o n storage C R T screen, when n o t in STORE mode.
INTENSITY: potentiometer. Controls brightness o f
CRT
beam.
7.
8.
9.
10.
FOCUS:
potentiometer. Adjusts sharpness o f C R T
beam.
PERSISTENCE: potentiometer. Controls duration of
written trace, when n o t
in
STORE mode. F u l l y
clockwise position selects STORE mode.
INPUT: lever switch. Routes data f r o m the 3721A
i n t o Store 1 o r
2
as selected. In HOLD position retains
data
in
stores.
LINE-ON:
toggle switch. Controls ac supply t o
t h e
instrument.
Figure 1-2 Front panel controls and indicators
L
1-2
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