Fluke 8506A Instruction Manual page 138

8506A
5200A
5200A
SELECT:
VOLTAGE;
Per Procedure
VOLTAGE
RANGE:
Per Procedure
FREQUENCY:
Per Procedure
SENSE:
Externa! (straps
installed)
PHASE
LOCK:
Off
INPUT POWER:
Connect
to
same
source
as other equipment
CONNECTIONS:
All
other instrument or
IEEE
cable
connections must be
removed
931
B SELECT:
POWER: BAT OPR
RANGE:
Per Procedure
MODE:
.1% Null for testing
and
XI
TVM
when
changing Ranges
or Setting
DIALS:
Per Procedure
Figure
4-10.
Equipment Set-Up F
4.
Verify that the 931
B
reading
is
within
the
attenuator manufacturer's
specification for dc
attenuation accuracy.
NOTE
The
Attenuator
Flatness
Verification Test
need
only be performed
every five years
,
or
if
the attenuator
fails the
Low
Frequency
Attenuator Accuracy
Test
.
4-103.
ATTENUATOR
FLATNESS
VERIFICA-
TION TEST
4-104.
931
B
Characterization Procedure
4-105. Characterize attenuation versus frequency
flatness for the
93 IB using the following procedure.
1.
Connect
the
5200 A, 540B, and
the 93
IB
as
shown
in
Figure 4-11.
7.
Repeat
steps 5
and
6
above
for
50 kHz.
8.
Repeat
steps 5
and
6
above
for
100
kHz.
9.
Repeat
steps 5
and
6
above
for 500
Hz
and
check
for repeatability within
.002% of null
4-106. Attenuator
Flatness
Verification
Test
Procedure
4-107.
Perform
the flatness verification
test
on
the
20dB
attenuator using the following procedure:
1
.
Connect
the
5200 A, 540B,
93
1
B,
and
the 20
dB
y ,.
attenuator as
shown
in
Figure
4-12.
2.
Select a
2.5V
(at
500 Hz) output on
the
10V
range
from
the
5200A.
2.
Select a
250
mV
(at
500 Hz) output on
the
IV
range
from
the 5200A.
3.
With
the
O.SVrange and
the
AC
Transfer
mode
set
on
the 540
B, adjust the
5200
A
output
to obtain a
null indication
on
the 931
B.
4.
While
still
maintaining
a
null
on
the
93
IB,
adjust the
540B
for a null indication on
the
galvanometer.
5.
Select a frequency of 20
kHz
from
the 520QA.
6.
Record
the reading
on
the
93
IB.
3.
With
the 93
1
B
on
the
1
V
range
adjust the
5200
output
to obtain
a null
indication on
the
93
IB.
4.
With
the
540
B
on
the
2V
range
in
the
AC
Transfer
mode
adjust for a
null indication
on
the
540B
while
still
maintaining
a
null
on
the 93
IB.
5.
Increase the frequency output
on
the 5200
A
to
20 kHz.
6.
Adjust
the
5
200
A
output
level to obtain a
null
indication
on
the
540 B
meter.
7.
Record
the reading
on
the 93
IB.
4-24