Test Equipment Required For Maintenance - Fluke 415B Instruction Manual

41
5B
REQUIRED EQUIPMENT
Autotransformer
or
Variac
DC
Differential
Voltmeter
- Fluke Model 885A
Voltage Divider
-
Fluke Model
80F-5
RMS
Voltmeter
-
Fluke
Model
93
1A
SPECIFICATIONS
REQUIRED
Output
of
0-130
volts
at 3
amperes
or
0-260
volts
at
l. 5
amperes.
Accuracy
of
0.
0025%, 0-1000
volts.
Accuracy
of
0.
01%, input voltage
to
5000
volts.
Capable
of
measuring
non- sinusoidal voltages
of less than
100 microvolts.
Oscilloscope -
Tektronix
Type
541 with
Type
D
Plug-In Unit
1
millivolt/centimeter
sensitivity.
VTVM
-
RCA
Voltohrnyst DC
accuracy ±3%
DC
Blocking Capacitor
0.
05
uf
minimum
capacity, 5000
volts dc
Power
Resistor
16.7 kilohms ±5%,
15 watts.
Composition Resistors
1,
000
ohms
±5%, 2 watts.
100
ohms
±5%,
2
watts.
1
megohm
±5%,
1
watt.
Silicon
Diodes
-
Two
required Type 1N4818
or
equivalent with
50
amperes
surge
capability
and no greater than
20
pf
capacity.
Preamplifier - Tektronix Type
123 Gain
of
100 with low
level noise and hum.
Battery
1. 5
volts.
Figure
4-1.
TEST EQUIPMENT REQUIRED FOR MAINTENANCE
AND
CALIBRATION
be
substituted
provided
they
have
the
required speci-
fications given in the figure.
4-17.
PERFORMANCE
TESTS
4-18.
introduction
c.
Perform
the procedures described
in
paragraph
2-9,
Initial
Operation.
4-22.
STABILITY.
This
test
measures
the deviation
in
output voltage over
a specified time
period. This
deviation
is
due to the internal
temperature
rise of the
unit.
4-19. The
following tests
are intended for checking the
performance
of the
Model
415B.
These
tests
may
be
used
for incoming
inspection,
periodic inspection and
precalibration checks.
It
is
recommended
that
these
tests
be
performed
after circuit
repair and before each
calibration.
*
4-20. The
load, line
and
ripple
checks do
not
depend
on any
calibration adjustments, and a
fault
detected by
testing
can
usually be isolated
by performing
the
checks
in the subsection covering troubleshooting.
Minor
errors
in
accuracy
of
the output voltage
may
be cor-
rected by adjustment
of
the reference
current,
paragraph
4-30.
Should
the adjustment be
ineffectual or
at
a
limit,
you must
investigate
the
cause
of the
problem.
a.
Set the controls
of
the
Model 415B
as
follows:
POWER
HIGH VOLTAGE
POLARITY
OUTPUT VOLTAGE
dials
ON
STDBY/RESET
Positive
First
dial to 2500;
second
dial to 500;
all
others
to
zero
b.
Connect
the input
of the
Model 885A across
the
output
of
the Model
80F-5 voltage divider and con-
nect the divider input
to
the
OUTPUT
connector
of
the
Model
41 5B.
c. Set.
the
HIGH VOLTAGE
switch
to
ON.
Operate
the
instrument
for
at least 60
minutes.
4-21.
Preliminary Procedure
a. Connect
the
power
plug
of the
Model
415B
to the
output
of
an autotransformer and connect
the input
to the
autotransformer
to 115
volts, 60
Hz
line
power.
b.
Set
the
autotransformer
for
an output
of
115
volts.
d.
Adjust
the Model
88
5A
for
a null and record
the
output
indication.
e.
Operate
the
instrument
for
an
additional
60 minutes.
Again, measure
the output voltage.
The difference
between
the two voltages should be
no
greater than
60 millivolts
(6
millivolts at
10:1
divider output
terminals).
4-2
Rev.
1