Filter
Top Products
Section
III
Model
34904
Table
3-7.
Program
Codes.
CHARACTER
USE
OCTAL
CODE
BINARY CODE
b1 b6 b5
ba
b3
b2
b1
R
1
2
3
4
5
6
7
Range Program
ldentifier
10,00O
kf); Test
7
1
,000
kQ; l
OOO V;
Test
6
100
kO; 1OO
V;
Test
5
1
0
kQ; 10
V;
Test
4
1
kS2;
1
V;
Test
3
.1
kO;
.t V; Test
2
Autorange;
Test 1
122
061
062
063
og
065
066
067
1010010
011000'l
0110010
0110011
0110100
0110101
0110110
0110111
F
0
a
2
3
Function
Program
ldentifier
DC Volts
K
Ohms
AC
Volts
Test
106
060
061
62
063
1
0
0
0
0
0
1
1
1
1
0
0
0
0
0
1
0
0
o
0
1
0
0
1
1
0
0
1
0
1
s
0
1
2
3
Sample/Hold
Program
ldentifier
Sample/Hold
Off
Sample/Hold
Off
Track/Hold
Acquire/Hold
123
060
061
62
063
1
0
0
0
0
o
1
,|
1
I
1
1
1
1
1
0
o
0
0
0
0
0
0
0
0
I
0
1
a
0
1
0
1
T
o
1
2
3
Trigger
Source Program
ldentifier
Internal
Samole
Rate
*
lmmediate
Internal
Next External
Trigger
None
124
060
061
062
063
1010100
0110000
0lto001
0110010
o110011
M
0
I
2
3
4
5
6
7
Mode
of
Operation Program
ldentifier
Addressed
Multi
with
No
Output
Addressed
Multi
with
Output
Addressed
Single with No
Output
Addresed
Single with
Output
lnterrupt
Multi
with No
Output
Interrupt
Multi
with
Output
Interrupt
Single with
No
Output
.'-'
Interrupt
Single
with
Output
115
o60
061
062
063
0il
065
.i066
067
I
0
0
0
0
0
0
0
o
0
1
1
1
1
1
1
1
1
0
1
1
1
1
1
1
1
1
1
0
o
0
0
o
0
0
0
1
0
0
o
0
1
1
1
1
0
0
0
I
1
0
0
I
1
I
o
1
0
1
0
a
o
I
E
Execute
Mode
of
Operation Program
105
1
0 0
0 0
I
*
lf Internal
Sample Rate
is
programmed,
make sure front
panel
Sample
Rate control is
set
to
desired
position.
until
the
manual pushbutton
is pushed,
an
external
trigger
occurs,
or
the front panel
control
is taken
out of
hold.
3-1
11.
T1,
lmmediate
Internal.
The
3490A
never
re-
leases
the
Hold
line,
but instead
provides
an
External
Encode
command
when
ready
for
a
new
measurement
to
begin. It is,
therefore,
sampling
at its
madmum
rate, and
the
front panel
Sample
Rate control
is bypassed.
3-112.
T2,
Next
External
Trigger.
The 3490A
keeps
the
Hold line
LOW
and
releases
the
Sample/Hold
Inhibit
line
when
ready to
accept
the
next
trigger. When
an external
tngger
occurs,
the
GPIB
I/O
issues the External
Encode
command.
Pushing
the
front panel
manual
trigger
pushbutton
will
also
initiate
a
reading.
3-113.
T3,
None.
The
3490A
keeps
the
Holdline
LOW
and checks
for
an
output
request.
This
method
may be
used
to
store
data
for
output
at a later
time.
_i-l0
3-1
14.
Mode of Operation. The following
paragraphs
explain
the
mode of operation
codes shown
in Table
3-7.
3-115.
.M0,
Addressed
Multiple
with No
Output.
In
this
mode,
operation is similar to
operation when in
local
control
and not addressed
to talk.
Readings
are taken
according
to the
programmed
trigger,
but no
output
occurs.
3-116.
M1,
Addressed
Multiple with
Outpüt. The in-
strument
will
take a
reading
when
triggered
and output
the
reading if
addressed to talk.
Ifnot addressed
to
talk,
it
will
wait for
its talk
address to
output
data
or its listen
address to be
programmed.
After
output
of the
data or
receipt of new
programming
data,
the
GPIB
I/O
returns
to the
beginning of the
program
to
determine
the trigger
for the next
reading.
3-117. M2, Addressed
Single with
No
Output. The
instrument takes
one
reading when triggered
and does