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3330B
Local
mode
-
Can
be
calibrated to
be continuously
adjustable
from
10%
to
110%
of range
(see
Voltage
Trip-calibration
procedure).
NOTE
In the constant current
mode,
the actual
absolute
trip
voltage
is
decreased by the
following:
Output
Current
10 X
^
_
Volts
Output
Current
Range
NOTE
Output
goes
to
zero
and
unit returns to
standby
if
trip
point
is
exceeded.
Limit
indication
by
contact
closure
(see
Table 1-1)
and
front panel
lamp.
ISOLATION;
Programming
lines
are
isolated
from
output.
Output
is
isolated
and guarded from
chassis.
Po-
tential
between
programming
lines
and
either
side
of output should not
exceed
1150V.
METER:
For
local operation,
switch
selectabel to indicate
Oto
1100
VDC
orOto
110 ma.
PROGRAMMING
INPUTS/OUTPUTS:
All
inputs/outputs through
a
50
pin
rear
panel
connector.
Mating connector
furnished
wi^
in-
strument. See Table
1-1
for line functions.
OUTPUT
CONNECTIONS:
Separate
output and
sense
terminals
provided
for
four-terminal
connection to
the
load.
All
front
Table
1-1.
PROGRAMMING
INPUTS
AND
OUTPUTS
INPUTS
LINES
CODING
INPUTS
LINES
CODING
Logic
"0"
= +4.5
to
40
0100
+20V
or
open
circuit
50
0101
60
=
0110
Logic
"1"
= 0
to
+0.5V
70
0111
or closed
circuit
80
1000
90
1001
STANDBY
1
STANDBY
=
"0"
100
1010
OPERATE
OPERATE
=
"1"
110
1011
VOLTAGE
TRIP:
MODE
1
VOLTAGE
= "O"
CURRENT
= '1"
VOLTAGE
TRIP
2
RANGE
CODE
RANGE
2
CODE
10V TRIP
RANGE
00
100V TRIP
RANGE
01
(Code
"11" Not
10V
orl
MA
"00" {Code
"1 1" not
Allowed)
allowed)
1000V TRIP
RANGE
10
100V
orlOMA
"01"
1000V
or
1
00
M
A
"10"
REMOTE
TRIP
4
CODING
LEVEL
{10%
to
OUTPUT
LEVEL
28
DECADE CODING
110%
of
selected
1
RANGE
%
8421
<7
Decades)
DIGIT
8421
range)
<1%
=
0000
0
=
0000
10%
=
0001
1
=
CX)01
20%
=
0010
2
=
0010
30%
=
0011
3
=
0011
40%
=
0100
4
»
0100
50%
-
0101
5
"
0101
60%
«
0110'
6
»
0110
70%
=
0111
7
=
0111
80%
=
1000
8
*
1000
90%
=
1001
9
-
1001
100%
*
1010
10
«
1010
110%
-
1011
POLARITY
1
{+)
-
"0"
VOLTAGE
TRIP/
{
)
"1"
CURRENT
LIMIT:
LOCAL7REMOTE
1
LOCAL
-
"0"
CROWBAR
1
OFF
=
"0"
REMOTE
=
"1"
ON
»
"1"
CURRENT
LIMIT;
OPERATE FLAG
1
CONTACTS CLOSED
REMOTE
LIMIT
OUTPUT
IN
OPERATE
MODE
LEVEL
4
CODING
CURRENT
LIMIT
1
CONTACTS OPEN
FLAG
OUTPUT
IN
NORMAL
OPERA-
MA
8421
TION
1.0
=
0000
10
=
0001
VOLTAGE
TRIP
FLAG
1
CONTACTS OPEN
IN
20
=
0010
NORMAL
OPERA-
30
=0011
1
TION
Rev,
4/75
1-3
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