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Model 3400A
Section
m
SECTION
III
OPERATING INSTRUCTIONS
t
3-1.
INTRODUCTION.
3-2.
This
section consists
of
instructions
and
infor-
mation necessary
for the
operation
of
the -hp-
Model
3400
A RMS
Voltmeter.
This section contains
identi-
fication of
controls
and
indicators,
turn-on pro-
cedures,
and
operating
instructions.
Also
included
is
a
discussion
of
the applications for the
Model
3400A.
3-3.
CONTROLS AND
INDICATORS.
3-4.
Each
operating
control,
connector,
and
indicator
located
on
the
Model 3400A
is
identified
and described
in
Figure
3-1.
The
description
of
each
component
is
keyed
to
an
illustration of that
component which
is
included within the
figure.
3-5.
TURN
ON
PROCEDURE.
3-6.
Toturnonthe Model
3400A,
proceed
as
follows:
a.
Set
115/230 switch
(7,
Figure
3-1) to
correct
position for input
line
voltage.
b.
Apply
ac voltage
to
Model 3400A
by plugging
power
cord
into input
power
jack
(8)
ac
receptacle.
c.
Operate power
switch
(4)
to
ON;
ensure
that
LINE
indicator
(3)
lights.
NOTE
Allow
five
minutes
for the
Model
3400
A
to
warm
up and
stabilize
before
making
a
reading.
3-7.
OPERATING
INSTRUCTIONS.
DO NOT MEASURE
SIGNAL
ABOVE
80
VOLTS WITH
10
TO
1
CREST
FACTOR. OTHERWISE,
THE
MAXI-
MUM
INPUT RATING
(
800
VOLTS
PEAK)
WILL
BE EXCEEDED.
WHEN
MEASURING
SIGNALS
UP TO
80
VOLTS
RMS WITH
A
10
TO
1
CREST
FACTOR, USE
THE BNC TO DUAL
BANANA
JACK,
ACCESSORY
101 10A,
SUPPLIED WITH
THE
INSTRUMENT,
OR OTHER
INPUT TEST LEADS
AND
CONNECTIONS
THAT WILL
WITH-
STAND THE
MAXIMUM
INPUT
OF
800
VOLTS
PEAK.
3-8.
To
operate
the
Model 3400A
as
an
rms
volt-
meter proceed
as
follows:
a.
Attach
test
lead
to
INPUT
connector
(6,
Figure
3-
1).
(See
Table
1-3
for a
list
of test
leads
available.
b.
Set
RANGE
switch
(5)
to
300
VOLTS
position.
CAUTION
WHEN
MEASURING AN AC
SIGNAL
SUPERIMPOSED ON
A
DC
LEVEL,
ALWAYS
SET
THE RANGE
SWITCH
TO THE
300
VOLT
POSITION.
A
HIGH
VOLTAGE
TRANSIENT DUE
TO THE APPLICATION OF
A
DC
VOLTAGE WILL
DAMAGE
THE
INPUT
CIRCUITRY.
c.
Connect
test
lead
to
point to
be measured.
d.
Rotate
RANGE
switch counterclockwise
until
meter
(1)
indicates
on upper two
thirds
of scale.
3-9.
APPLICATIONS.
3-10.
The Model 3400A
can be used
in
conjunction
with other
test
instruments
to
measure
the
rms
value
of
ac signal with a dc
component,
measure
rms
current and
act as
an
rms
ac-to-dc converter.
For
additional
information
on
special applications, contact
your -hp-
Sales
and
Service
Office.
3-11.
RMS VALUE OF
AC
SIGNALS
WITH DC
COMPONENT.
3-12.
Since
the
3400A
is
an
ac device
it
will
measure
only the
rms
value
of
the
ac
component.
If
it
is
nec-
essary
to
include the
rms
value
of
the dc
component
when
measuring
a
signal
use
a-hp-Model 412A
DC
Voltmeter
to
measure
the
dc component.
Substitute
the
reading
from
the
Model 412A
and
Model 3400A
in
the following
formula:
The
ac
signal (up
to
800V
peak)
may
be
superimposed
on a dc
level
of
up
to
600
V.
rms
4
ac
'dc
3-13.
RMS
CURRENT.
3-
14.
To measure
rms
current,
use an -hp-
Model 456A
AC
Current Probe.
This probe
clips
around
the
current conductor
and provides an
output voltage
that
is
proportional
to
the
current being
measured. Using
this
method,
rms
currents
of
one milliampere
to
one
ampere
can be measured.
3-15.
RMS
AC-TO-DC CONVERTER.
3-16.
Since the
Model
3400
A
is
provided with a
dc
output
(10,
Figure
3-1)
which
is
proportional
to the
meter
deflection,
it
can be used
as a
linear
rms
ac
to
dc converter.
The
dc output
can
be
used
to
drive
a
-hp-
Model 3440A
Digital
Voltmeter
for
high resolu-
tion
measurements
and/or a
Mosely Model
680
Strip
Chart Recorder.
External
loading
does
not affect the
meter accuracy
so
that
both
the
meter
and dc
output
can be used
simultaneously.
A
plug
for
DC OUT
jack
may
be
purchased under
-hp- Part No. 1251-0067.
3-1

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