Specifications
The
above
description
applies,
at
least
in
part.
to
all
modules
except for the
DT5703
which
;s
internally
wired
for
differential
operation
and
has
no
provision to
make
operational
mode
changes with external jumpers.
Notice
that
the signal input
lines
on
P1D
are not arranged
;n
order of ascending channel
number.
but
rather
in
order of
ascending
differential
channel
pairs.
For
example, channel 0
and
channel 8
form
the
first
pair,
channell
and
channel 9
form
the
second
pair.
and
so
on.
this;s
to
make
it
easier
to
have
or
to
approximate the ideal of
an
input cable
composed
of twisted
differential
pairs.
In
reality,
the
common
ribbon cable
which
would
normally
be
used. has
interlaced
grounds
which
is
opti-
mum
for single-ended operation but represents a
compromise
for
differential
operation.
MUX
OUT
HI
and
MUX
OUT
LO,
which
appear
on
module
pins
11T
and~~f
llB are brought out to expansion connector
P3D.
If
expansion If
modules
are
used
in
the system.
their
outputs
are
fed to the
A/D
through these
lines.
As
a
result.
these
lines
must
be
shielded as
well
as
the signal input
lines.
5c. Gain.
Range.
and
Polarity
Options
All nine possible
modules
have
the
ability
to perform
conversions
on
input
signals
over the range 0 to
10
volts
or
~lO
to
10
volts.
jumper
selectable.
Some
modules
also
allow jumper
selection
of
ranges 0 to 5
volts
and
-5 to 5
volts.
In
addition.
most
of the
Data
Translation
modules
allow
selection
of
higher
levels
of
gain eigher under software control or
by
adding
resistor
R2D
depending
upon
which
version
of
a given
module
model
is
ordered. Higher gains require waiting a longer time
for
the
input
amplifier
to
settle.
Addition
of
capacitor
C1D
lengthens
the time before the
DLYOUT
pulse occurs.
which
is
usually
used
to
determine the
settling
time allowed. Tables
of
values
for
R2D
and
C1D
may
be
found
in
the
module
data
sheets.
Specific
jumpering
arrangements
for
jumper area A (analog)
(See
Jumper
Area
Numbering
Daughter Board)
for
the various
modules
may
be
found
in
the
jumpering pages. Information
on
these pages
may
differ
from
that
in the data sheets with regard to
module
pins
14T
and
148. These
pins are
identical
inputs to the
AID
converter
and
hence
may
be
interchanged with
no
effect,
thus accounting for
two
different
descriptions
in
the documentation, both
of
which
are
correct.
For the
MP6912
only, Analogic
recommends
that
a
filter
capacitor
be
added
to the
+10
volt
reference output having a
value
of
47
microfarads or
greater
at
20
volts.
The
MP6912
also
allows having a jumper between
9A
and
lOA
to change the input
voltage range
from
a decimal
scale
to a binary
scale.
That
is,
a
10.00
volt
range
would
become
a 10.24
volt
range
and
a 5.00
volt
range
would
become
a 5.12
volt
range.