4339B
Input
Signals
The
DC
isolated
input
signals
are
connected
to
the
cathodes
of
the
LEDs
in
the
opto-isolators
.
The
anodes
of
the
LED's
are
powered
by
an
external
voltage
source
(EXT
DCV2).
The
OFF
state
voltage
(high
level)
of
the
DC
isolated
input
signals
depends
on
the
pull-up
voltage
powered
by
an
external;
voltage
source
(EXT
DCV2).
(The
input
current
is
restricted
by
using
a
switch
on
the
main
board.)
The
electrical
characteristics
of
the
input
signals
are
listed
in
T
able
B-2 .
A
diagram
for
the
input
signals
is
shown
in
Figure
B-3 .
T
able
B-2.
Handler
Input
Electrical
Characteristics
Signal
Input
V
oltage
Input
Current
(Low)
Pull-up
V
oltage
Circuit
Common
Low
High
5
V
12
V
15
V
/EXT
TRIG
1
V
5
to
15
V
11.1
mA
10.5
mA
13.5
mA
COM2
/KEY
LOCK
1
V
5
to
15
V
5.2
mA
14.5
mA
18.5
mA
COM2
/HV
OFF
1
V
5
to
15
V
11.1
mA
10.5
mA
13.5
mA
COM2
Figure
B-3.
Handler
Interface
Input
Signal
Diagram
B-4
Handler
Interface
Installation
Summary of Contents for 4339B
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Page 268: ...Procedure 4339B Figure B 5 A1 Main Board B 8 Handler Interface Installation ...