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HP 3457A - 3-50. Scanning

HP 3457A
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Operation
3457A
*
Make
the
measurement
-
Press
the
SINGLE
/
F
configuration
key
to
start
the
measurement
sequence.
The
instrument
will
read
each
channel
listed
and
store
the
readings
in
memory.
©
Recall
the
readings
-
Press
the
Reading
Memory
RECALL
/
S
key
then
the
ENT
/
LAST
ENTRY
key.
The
reading
displayed
is
the
last
reading
taken.
The
readings
are
shifted
into
memory
so
that
the
first
reading
taken
is
in
the
highest
number
memory
location.
The
last
reading
taken
is
in
memory
location
|.
Use
the
{/AUTO
and
|/HOLD
scroll
keys
to
view
the
measurement
readings.
Use
the
</TEST
and
/RESET
display
keys
to
read
the
total
display
contents.
¢
To
repeat
the
same
set
of
measurements
-
Press
the
CONFIG
/R
configuration
key
then
the
ENT
/
LAST
ENTRY
key
to
clear
the
reading
memory.
Press
the
SINGLE
/
F
configuration
key
to
start
the
new
reading
sequence.
3-45.
HP
44492A
Reed
Relay
Multiplexer
(Manual
Operation)
3-46.
The
HP
44492A
Reed
Relay
Multiplexer
has
ten
2-wire
input
channels
numbered
0
through
9,
This
multiplexer
is
used
to
make
voltage,
resistance
and
frequency
or
period
measurements,
It
is
not
designed
to
make
4-wire
ohms
or
current
measurements.
3-47.
Measurement
Selection.
Determine
the
type
of
measurement
you
wish
to
make
(Voltage,
Resistance
or
Frequency/Period)
and
set
the
instrument
for
that
measurement
as
described
in
the
previous
paragraphs.
3-48.
Input
Selection.
To
use
the
Reed
Relay
Multiplexer,
the
instrument
must
be
set
to
the
Rear/Scanner
input.
©
Select
the
Rear/Scanner
input
-
Press
the
TERM
/
M
configuration
key.
Use
the
[/AUTO
or
|/HOLD
scroll
key
to
display
REAR:2
or
SCANNER:2
and
press
the
ENT
/
LAST
ENTRY
key.
3-49,
Channel
Selection.
Only
one
input
channel
can
be
selected
at
a
time.
When
an
input
channel
is
closed,
the
channel
previously
closed
is
automatically
opened.
©
To
select
an
input
channel
-
Press
the
CHAN
/
N
configuration
key,
enter
the
number
of
the
channel
to
be
closed
and
press
the
ENT
/
LAST
ENTRY
key.
©
To
open
all
channels
-
Press
the
Blue
SHIFT
key
then
the
OFFSET
COMP
/
C
key.
Use
the
}/HOLD
scroll
key
to
display
CRESET
and
press
the
ENT
/
LAST
ENTRY
key.
3-50.
Scanning.
The
instrument
can
be
set
to
automatically
take
a
number
of
readings
and
store
them
in
memory.
This
makes
it
possible
to
measure
some
or
all
of
the
input
channels
and
recall
the
measurements
taken.
The
following
is
a
simple
procedure
to
measure
inputs
connected
to
channels
0
through
9
of
the
HP
444924
Reed
Relay
Multiplexer.
©
Determine
the
type
of
measurement
you
wish
to
make
(Voltage,
2-Wire
Resistance,
Frequency/Period)
and
set
the
instrument
for
that
measurement
as
described
in
the
previous
paragraphs.
®
Select
the
Rear/Scanner
input
-
Press
the
TERM
/
M
configuration
key.
Use
the
}/AUTO
or
{/HOLD
scroll
key
to
display
REAR:2
or
SCANNER:2
and
press
the
ENT
/
LAST
ENTRY
key.
©
Set
the
Trigger
to
Hold
-
Press
the
Blue
SHIFT
key
then
the
STORE
/T
configuration
key.
Use
the
{/HOLD
scroll
key
to
display
the
TRIG
command.
Press
the
+/RESET
display
key
once
to
hold
the
com-
mand.
Use
the
t/AUTO
or
|
/HOLD
scroll
key
to
display
HOLD:4
and
press
the
ENT
/
LAST
ENTRY
key.
©
Set
the
number
of
readings
to
match
the
number
of
measurements
to
be
made
(in
this
case
10)
-
Press
the
NDRGS
/
L
configuration
key,
enter
the
number
10
and
press
the
ENT
/
LAST
ENTRY
key.
3-8

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