A
Caution
It
is
recommended
that
you
do
not
stack
more
than
three
connectors
,
one
on
top
of
the
other
.
Hand-tighten
the
connector
lock
screws
.
Do
not
use
a
screwdriver
.
HP-IB
Logic
Levels
The
HP
8153A
HP-IB
lines
use
standard
TTL
logic
,
as
follows:
True
=
Low
=
digital
ground
or
0Vdc
to
0.4Vdc
F
alse
=
High
=
open
or
2.5Vdc
to
5Vdc
All
HP-IB
lines
have
LOW
assertion
states
.
High
states
are
held
at
3.0Vdc
by
pull-ups
within
the
instrument.
When
a
line
functions
as
an
input,
it
requires
approximately
3.2mA
to
pull
it
low
through
a
closure
to
digital
ground.
When
a
line
functions
as
an
output,
it
will
sink
up
to
48mA
in
the
low
state
and
approximately
0.6mA
in
the
high
state
.
Note
The
HP-IB
line
screens
are
not
isolated
from
ground.
Removing
and
Fitting
Modules
The
unit
can
t
two
single
width
modules
,
or
one
double
width
module
.
How
to
Remove
a
Module
Caution
Do
not
use
the
electrical
or
optical
connectors
to
pull
the
module
out
of
the
instrument,
as
this
can
cause
damage
to
the
connectors
.
Make
sure
that
the
line
power
is
switched
o
before
you
remove
a
module
.
Installation
A-7
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Содержание 8153A
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