Applications - Fluke 415B Instruction Manual

41
5B
NOTE!
To
obtain best
output
stability
from
the
Model
41 5B, the
HIGH VOLTAGE
switch should be
set to
STDBY
/RESET
and
the
POWER
switch
left
ON.
This
will
maintain an even
distribution
of
heat within
the unit
and
prevent the need
for
recurrent
warmups.
For
highest
stability appli-
cations, the
OUTPUT
VOLTAGE
dials
should
be
set to
the desired
voltage
and
the
HIGH
VOLTAGE
switch
left
ON.
2-12.
APPLICATIONS
2-13. Calibration of Meters
2-14.
The Model 415B may
be
used
for direct calibra-
tion of
dc instruments
to
an accuracy
of
0.
25% or 100
millivolts
(whichever
is greater)
at
3100 cardinal
points,
1
volt apart,
from
0 to
3099
volts.
The
vernier
dial
provides an
additional
1.
2 volts of
range
for calibration
between
cardinal
points.
Proceed
as
follows:
a.
Set the
POLARITY
switch
to the
desired
polarity.
b.
Connect
the
instrument
being calibrated firmly
to
the
power
supply.
Check
the external
circuit
for
conflicts in
grounding
before applying
power
to the
load.
c.
Set
the
HIGH
VOLTAGE
switch
to
ON. The
STDBY/
RESET
lamp
will extinguish
and
the
HIGH
VOLTAGE
ON
lamp
will illuminate.
d.
Set the
first
four
0
TT
TP
TT
T
VOLTAGE
dia 1
^
to
t
K,;>
desired cardinal
point.
Use
the last dial
if
a
cali-
bration point
between
the
one
volt
cardinal points
is
desired.
e.
To
remove
the output voltage
from
the output con-
nector,
set the
HIGH
VOLTAGE
switch
to
STDBY/
RESET.
2-15.
When
used with a John Fluke
differential volt-
meter
and voltage divider,
the
415B
is
capable
of cali-
brating dc instruments from
0 to
3100
volts with
an
accuracy
of
0.
01%
to
0.
06% with
5
millivolts resolution.
For
calibration
of
instruments from
0 to
1100
volts,
proceed
as follows:
a. Set the
POLARITY
switch
to
the desired
polarity.
b.
Connect
the instrument being calibrated securely
to the
power
supply.
Check
the
external circuit
for conflicts in
grounding before
applying
power
to the load.
c.
Connect a John Fluke
differential voltmeter
to the
instrument being
calibrated.
d.
Set
the differential voltmeter
to
measure
the voltage
desired at the calibration point.
e.
Set
the
HIGH
VOLTAGE
switch
to
ON.
The
STDBY/
RESET
lamp
will extinguish
and
the
HIGH
VOLTAGE
ON
lamp
will illuminate.
f.
Null the differential voltmeter
by
adjusting
the
OUT-
PUT VOLTAGE
dials.
The
accuracy
of the voltage
measured
is
from
0.
01%
to 0.
05%, depending
on
the
accuracy
of
the differential
voltmeter
used.
g.
Set the
HIGH
VOLTAGE
switch
to
STDBY/RESET.
h.
Repeat
steps
d.
through
g.
for
as many
calibration
points as desired.
2-16. For
calibration
of
instruments from
1100
volts to
3100
volts, px'oceed as follows:
a.
Set the
POLARITY
switch
to
the desired
polarity.
b.
Connect
the
instrument being
calibrated firmly
to
the
power
supply.
Check
the external
circuit for
conflicts in
grounding before applying
power
to the
load.
c.
Connect
a
John Fluke Model 80N-5
Voltage Divider
to the
instrument being
calibrated and
connect
the
differential
voltmeter
to the voltage divider
output
terminals.
d.
Set the differential voltmeter
to
measure
the volt-
age
at the
desired
calibration point,
considering
the
ten-to-one
division ratio
of the voltage
divider.
e.
Set the
HIGH
VOLTAGE
switch
to
ON. The
STDBY/
RESET
lamp
will extinguish and
the
HIGH VOLTAGE
ON
lamp
will illuminate.
f.
Null
the
differential
voltmeter by
.adjusting the
OUT-
PUT VOLTAGE
dials.
The
accuracy
of
the voltage
i
o
f r*rv»y*
a_p
CiP.Of
r
^
^
the
accuracy
of the differential voltmeter and
volt-
age divider used.
g.
Set the
HIGH
VOLTAGE
switch
to
STDBY/RESET.
h.
Repeat
steps
d.
through
g.
for as
many
calibration
points
as
desired.
2-17.
Operation with
a
Reference
Divider
2-18.
When
the output
of
the
Model 415B
is
compared
to a
standard
cell
by
way
of
a reference
divider, the
Model 415B
can be
set to provide voltages
of
an
accuracy
greater than
the
inherent accuracy
of
the
instrument.
When
used with
the
Model 750A Reference Divider and
the
Model
845AB
Voltmeter/Null Detector,
the
Model
415B
can provide voltages
0.
1,
0. 5,
1. 0, 5, 10,
100,
500, 1000,
and 1100
volts
which have an accuracy
of
10
to 20
ppm, and are traceable
to
the National
Bureau
of
Standards. Connect
the
equipment as shown
in
Figure
2-3 and proceed as
follows:
a.
Set the
Model 415B
HIGH
VOLTAGE
switch
to
STDBY/RESET
and
the
POWER
switch
to
ON.
b.
Set the
Model 750A
STANDARD CELL
dials to the
voltage value
of the
standard
cell
being
used.
c.
Set
the
Model 750A
INPUT
VOLTAGE
switch
to
1100 volts
or the highest voltage desired.