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HP 3457A - 3-32. Frequency;Period Measurements (Manual Operation); 3-33. Function Selection

HP 3457A
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Operation
3457A
3-32.
Frequency/Period
Measurements
(Manual
Operation)
3-33.
Function
Selection.
The
measurement
function
is
selected
by
pressing
the
appropriate
key.
The
func-
tions
available
are
Frequency
and
Period.
©
To
select
Frequency
-
Press
the
FREQ
/
PER
function
key.
©
To
select
Period
-
Press
the
Blue
SHIFT
key
then
the
FREQ
/
PER
function
key.
3-34,
Range
Selection.
The
HP
3457A
has
an
Auto-Range
feature
which
automatically
selects
the
proper
range
to
measure
the
signal
applied.
3-35.
Measurement
Resolution.
Measurement
Resolution
is
changed
by
selecting
the
number
of
digits
dis-
played.
You
can
choose
a
display
of
3
1/2,
4
1/2,
5
1/2
or
6
1/2
digits.
The
1/2
digit
refers
to
the
most
sig-
nificant
digit
which
is
limited
to
a
value
of
0,
1,
2,
or
3.
The
default
number
of
digits
displayed
is
5
1/2
(most
significant
digit
plus
5
digits).
©
To
change
the
number
of
digits
displayed
-
Press
the
DIGITS
DISP
/
P
configuration
key,
enter
the
number
3,
4,
5
or
6
and
press
the
ENT
/
LAST
ENTRY
key.
3-36.
Integration
Time.
The
Integration
time
can
be
changed
to
reduce
measurement
noise
or
to
permit
faster
readings.
The
integration
time
is
dependent
upon
the
power
line
frequency
and
is
expressed
in
num-
ber
of
power
line
cycles
(NPLC).
There
are
six
integration
times
available;
100
PLC,
10
PLC,
|
PLC,
.1
PLC,
005
PLC
and
.0005
PLC.
The
greater
the
PLC
number,
the
quieter
and
more
accurate
the
reading
will
be
and
the
slower
the
measurement
speed.
©
To
select
the
Integration
Time
-
Press
the
NPLC
/
A
configuration
key.
Use
the
{/AUTO
or
|/HOLD
scroll
key
to
display
the
desired
number
and
press
the
ENT
/
LAST
ENTRY
key.
The
Integration
Time
can
also
be
changed
by
pressing
the
NPLC/A
key,
entering
the
desired
number
directly
using
the
MATH
keys
and
pressing
the
ENT/LAST
ENTRY
key.
3-37.
Input
Connections.
For
frequency/period
measurements,
the
input
signal
is
applied
to
the
INPUT
HI
and
LO
Terminals,
This
applies
to
both
Front
and
Rear
Terminal
operation.
When
using
one
of
the
optional
Plug-In
assemblies,
the
input
is
connected
to
the
HI
and
LO
inputs
of
a
particular
channel.
3-38,
Front/Rear
Input
Selection.
The
Input
configurations
are
Front
Terminals,
Rear
Terminals/Scanner
or
Open.
Only
one
input
configuration
(front,
rear,
scanner
or
open)
can
be
selected
at
a
time.
¢
To
select
Input
configuration
-
Press
the
TERM
/
M
configuration
key.
Use
the
{/AUTO
or
{/HOLD
scroll
key
to
display
the
desired
input
and
press
the
ENT
/
LAST
ENTRY
key.
The
input
can
also
be
changed
by
pressing
the
TERM/M
key,
entering
the
appropriate
number
using
the
MATH
keys
and
pressing
the
ENT/LAST
ENTRY
key.
3-39.
HP
44491A
General
Purpose
Multiplexer
(Manual
Operation)
3-40,
The
HP
44491A
General
Purpose
Multiplexer
has
eight
2-wire
input
channels
numbered
0
through
7
and
two
current/actuator
channels
numbered
8
and
9.
The
2-wire
input
channels
can
also
be
configured
as
four
4-wire
input
channels,
In
this
configuration
the
input
channels
are
numbered
10
through
13.
3-41.
Measurement
Selection.
Determine
the
type
of
measurement
you
wish
to
make
(Voltage,
Resistance,
Current,
Frequency/Period)
and
set
the
instrument
for
that
measurement
as
described
in
the
previous
paragraphs.

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