Table of Contents
Advertisement
341
343A
c.
Set the
CURRENT
LIMIT
control
fully
clockwise
(25)
or to a
predetermined
value,
using
the proce-
dure of paragraph
2-17.
d.
Set the
RANGE
switch
and
voltage
dials
to the value
of
the desired
output
voltage.
e.
Set the
FUNCTION
switch
to
ON.
f.
The
output
voltage delivered to the
load
will
corres-
pond
to the voltage
indicated
on
the voltage
dials.
To
monitor output
voltage
or current, place the
FUNCTION
switch
in either
the
METER VOLTAGE
or
METER CURRENT
position.
2-27.
APPLICATIONS
2-28.
The Model
341
A/343
A
Voltage
Calibrators pro-
vide
parameters of
stability,
accuracy,
temperature
co-
efficient
and
response required
by
a
broad
range of
labora-
tory
and
production
applications.
The
following
para-
graphs
describe
a
method
of using the instrument
as a
differential
voltmeter and,
in
conjunction with
a
reference
divider, as
a
precision voltage
source
with
traceability to
the
National Bureau of Standards.
2-29.
OPERATION
AS
A
DIFFERENTIAL
VOLTMETER
2-30.
The Model
341
A/343
A
can be used
in
combina-
tion
with
a
null
detector,
such
as
the
Fluke
Model 845AB,
as
a
differential
voltmeter.
Connection
of the
equipment
for
measurement
of
a positive
voltage
is
shown
in
Figure
2-3.
Proceed
as
follows:
MODEL
34
1A/343A
Figure
2-3.
DIFFERENTIAL
VOLTMETER
a.
Connect
the
null
detector
INPUT
terminal to the
positive
terminal of the
voltage to
be measured,
and
connect
the
null
detector
COMMON
terminal
to
the
Model 341 A/343
A
+
OUTPUT
terminal.
Connect
the
Model
341A/343A
- OUTPUT
terminal
to the
negative
side
of
the voltage being
measured.
WARNING!
To
eliminate
shock
hazard, leave the
ground
terminals
of
the
Model
341
A/343
A
and
null
detector disconnected.
b.
Set the
null
detector voltage range
and Model 341 A/
343A
voltage
dials
to
approximately
the voltage
being
measured.
If
the
voltage
being
measured
is
not
known,
set
the
null
detector
to
the
1000
volt
range
initially.
c.
Set the
Mode] 341 A/343
A FUNCTION
switch to
ON,
and
set
the
CURRENT
LIMIT
control
as desired.
d.
Set
the
Model
341
A/343
A RANGE
switch
and
vol-
tage
dials
to the
approximate
voltage indicated
by.
the
null
detector.
The
null
detector
should then
indicate
a
null.
e.
Set the
null
detector
for
increased
sensitivity,
and
adjust
the voltage
dials
for
zero deflection
on
the
null
detector.
f.
The
value
of
the voltage being
measured
is
indicated
by
the
Model
341
A/343
A
voltage
dial
setting at
zero
deflection
of
the
null
detector.
g.
To
measure
a
negative voltage, reverse the
connec-
tions
at
the
Model
341
A/343
A
OUTPUT
terminals.
2-3
1
.
OPERATION AS A
1
0
PPM SOURCE
2-32.
The Model 341 A/343
A
together
with
a
reference
divider
such
as
the
Fluke
Model
750A
can provide
voltages
of
0.1, 0.5,
1,
1.1, 5,
10, 50,
100, 500, 1000,
and 1100
volts dc,
which
have an accuracy of 10
ppm
and
are trace-
able
to
the
National
Bureau of
Standards.
Equipment
connection
is
shown
in
Figure
2-4.
Proceed
as
follows:
a.
Set the
Model
750A
input switch to
RESET
Adjust
the
Model
341
A/343
A CURRENT
LIMIT
control
for
2 milliamps,
using the
procedure of paragraph
2-18.
b.
Set the
Model
341 A/343
A FUNCTION
switch
to
STANDBY/RESET.
Set the
Model
750A
standard
cell
voltage
dials
to the voltage
of
the
standard
cell.
2-6
Advertisement
Table of Contents
