Control Of; Dvm Output - Datron 1061A User Handbook Manual

Delay.
DX
inserts
the
standard internal
delay into
the digital circuitry to
allow
for the settling
of
analog signals
and
is
dependent
upon
the
function/
range/
filter
combination
selected.
1061 Positive
readings
(A
— 0
to )
Reading
=
,
(
jj
f
+
D__
—
\
x
p
u
||
ran ge
T
\
32
8192
2097152
/
D*** (D
followed by a
number
in the
range 0-254)
inserts a
programmable
delay.
Delay
=
(***N)
mS
where
***
is
in the
range 0-254
and
N
=
lOmS
(1071) or
5
mS
(1061)
Control
of
DVM
output
Output
notation.
O0
configures the
data
to
be
output as
an ASCII
character string in
scientific
notation,
with range and function
data
in
the
following format:
r
I.8888(8)(8)(8)E±880CrLf
#
:r
A
X
(EOI
is
also
available on
the
last byte)
±DC 4%
digit
-
~AC
SVi digit
-
#
DC
coupled
AC
6
y
2
digit
.
j
IVi digit
-
1061 superfast
V
=
volts
1061
normal
O
-
ohms
1061
A
hi. res.
A
=
amps
1071 normal DC
/f2
1071
hi. res.
DC/12
1071 averaging
DC/12
Programming Ol
includes
in
the
output
string
full
instrument
status
information having
the
format:
+ v
~
1.8888(8)(8)(8)E±88O,R4F3M0N0P0QlT7C0A0DXW0CrLf
#
A
(EOI
is
also available
on
last byte.)
NOTE:
DX
will
be replaced
by
D? when
using
non-standard delays.
Programming
02
or
03, changes
the
output
to
four
byte
binary
where
the
reading
is
represented
as
a
fraction of
full
range. Various formats exist to
cope
with the variable
scale lengths
and
the
following
equations are provided
for
translation to
decimal
numbers assuming
the four bytes
in
order
are
A
B
C
&
D.
1071
Positive readings
(A
=0|
O
or
1
10 )
Reading
=
+
/a
+
B
+
C
+ p
\
x Full
range
\
256 65536
16777216/
1071
Negative readings
(A
=
255
10
or
254
10 )
Reading
—
_
/
(255-A)
+
(255-B)
+
(255-C)
+
(256-D)
\
x
Full
\
256
65536 16777216
/
Range
1061
Negative readings
(A
—
255
i0
)
Reading
=
/
(255-B)
+
(255-C)
\
32 8192
(2a6-D)
_
\
x
p u
|j r
„
nge
2097152
j
1061
Superfast positive readings
(B
=
0)
Reading
=
+ /JL+_
D
\
x Full
range
\
64 16384
/
1061 Superfast
negative readings (B
—
255)
Reading
=
.
/ 255 -C
+
(256-D)
\
x
p
u u range
l 64 16384
/
NOTE:
l.
Since byte
A
is
not required for data
in
superfast
mode
the
instrument
status
byte
is
substituted.
2.
The most
significant byte,
i.e.
A,
is
the
first
byte output.
3.
Only
EOI
is
available as
a terminator
with
the last
byte
in
02
mode.
03 mode
has no
terminator.
4.
Autorange
is
not
recommended
in
binary output modes.
When
the
output has
been
read
no further output
is
available until
the
data
from
another
measurement
cycle
has
been obtained
and
processed.
If
an
error
occurs during a
measurement
cycle the
normal
output
is
replaced
by a message,
e.g.:
In
O0
and
Ol an overload
would produce
'ERR
OL'.
In
02
and 03 two conditions are
set
up:
a.
bit
b8 of the
SRQ
Instrument Status Byte
is
set
to
1,
so that
a
subsequent
serial
poll will reveal
an
invalid
measurement
to
a controller
programmed
to
process
SRQs.
(In Superfast, byte
A
contains
this
information.)
b.
Except
in
Superfast,
all
four
bytes are
set to 255
)0
(all
1
s).
This
is
equivalent
to
an unlikely (though
still
valid)
near- zero
measurement
of
minus
1
bit.
In superfast;
bytes
B.
C
and
D
are
each
set to
255,,
Thus
in
02
or
03,
an
Error Overload should be
detected
by
examining
the
instrument
status byte.