SECTION2
Operation
Output
,,
,,
H
L
G
+
Ch
1
'"
""
"
Special
Cable
(See
warning)
/
cp
,,
~t_
""
WARNING:
<I=
p
p
Guard
from
7154
Output
HI
f\
(
must
be
insulated
to
"'U
(
~;::I
Ch10
prevent
electric
shock.
Guard
-<
To
•;
~o-
~
DUT#10
Sense
HI
;;
f\
"
r---~
nU
I
l
I
Guard
'"'"
"'
7154
,
IJ-
I
;;
I
Sense LO
•;
f\
,
I
OUT
I
OutputLO
;;
u
I
#1
I
•;
"
(\
I
T
I
Output
Ch
1
"'
,,
!
r
I
'"'"
Output LO
)-
f-<
f\
'"'"
H
;;
"
I
I
"'
-'"'"
L
--
f-<<
,,
1-----l
"
,
'"'"
G
;;
,
~rt-
"
Test
-=
236/237/238
Fixture
Ch10
CAUTION
f-<
To
WARNING
:
To
avoid
electric
shock,
To
prevent
damage,
do
not
~o-
f-<
DUT#10
test fixture
chassis
must
be
connected
"hot"
switch
high
voltage
;
to
a
safety
earth
ground.
(>200V).
Also,
use
the scanner
'
mainframe
in
the
4-pole
mode
to
synchronize
HI
and
LO
switching
7154
and
avoid
open
sense
leads.
Figure
2-27.
Using
Two
Model
7154s
for
Remote
Sensing
(Guarded)
2.7.2
Model70541-pole
High
Voltage
Scanner Card
The Model7054 is a 1-pole,
10-channel
high
voltage scan-
ner
card that is controlled
by
the Model
70S
or
706
Scan-
ner. The
LO
path
of the scanner card is
not
switched
and
is common to
a1110
channels
and
the output. The maxi-
mum
rated voltage from
LO
to chassis
ground
is
200V.
As
a result,
GUARD
of
the Model
'1:37
must
never
be
con-
nected to scanner card
LO
for
high
voltage switching.
2.7.3
Model 7070-PCA
Prototype Circuit
Assembly
The Model
7070-PCA
is a prototype
board
that
is con-
trolled
by
the Model707 Switching Matrix.
An
unplated
prototype breadboard area is available for building
high
voltage switching
circuits.
2-32
+
Ninety-six open-collector drivers are provided to control
user-supplied relays. Also provided are
20
quick-discon-
nect terminal blocks. Each terminal block has three screw
terminals.
2.7.4
Modei7072-HV
High
Voltage Semi-
conductor Matrix Card
The Model 7072-HV
is
an
8 x 12 matrix card
that
is
con-
trolled
by
the Model707 Switching Matrix.
It
is
similar to
the Model7072 Semiconductor Matrix
Card
except that
it
can switch
up
to
1300V
on
its
low
current rows
(A
and
B).
Model7072-HV
row
connections for
high
voltage switch-
ing of
OUTPUT
HI/GUARD
and
SENSE
HI/GUARD
signals are limited to rows A
and
B.
Column connections
are
the same as those
shown
in
Figure 2-24 for a Model
7072, except
that
only crosspoints
in
rows A
and
B can
be
used
to switch high voltages.
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