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Section
III
Model3490A
1.
2.
Line
Switch,
push
on/push off.
.'^".
Sample
Rate Control.
Maximum sample rate is selected in
clockwise
position.
Each
counterclockwise
step adds a
known delay.
Manual Trigger
Pushbutton in
center
of Sample
Rate
control.
Sample/Hold Switch
(Option
o4o/045).
Selects Sample/
Hold mode.
Ratio
Switch
(Option
0801. Selects
internal or
external
referen@.
Range
Switch
keys.
The
Range
Switch
keys are
interlocking.
That
is,
when
one range key
is
pressed,
the Previ-
ously selected
key
is
released.
Do
not
pull
up
on a range key,
or
mechanical
damage will
result-
a
Signal or
External Reference
(Option
O80l input
terminals.
.
._.8.
Guard terminal,
i\-
9. InPut
terminals.
10. Function Switch.
1
1.
Thermal Adjust. See
Paragraph
3-41.
'|
2. Rear
Panel input connector in
parallel
with
front
terminals. Included
with
Options 020
or
030. See
Figure
2-7.
1 3. Line
voltage selection switch.
gee
Figure
2-1
.
14.
Remote
Input connector J7
(Option
0201. See
Figure
2-6.
1
5. Line
fuse.
16, AC
power
@nnector.
17. Data Output
connector
J6
(Option
0201.
See
Figure
2-5.
18.
General
Purpose
Inter{ace
Bus
connector J12
(Option
030).
See
Figure 2-9.
19. Trigger
Input
connector J1 l
(Option
030 or 045).
See
Figures 2-l0
and2'11.
J.
4.
5.
6.
l-rJ
Figure
31.
Front and
Rear Panel.