8021
B
2. Using a pointed
tool such as a probe tip, pry
the backup fuse from its holder.
3. Replace the defective
backup fuse with a 3A, 600V
type BBS-3 only.
4-21.
PERFORMANCE
TEST
4-22.
The performance test is used
to compare the 8021
B
performance with the list
of
specifications given in Section I
of this manual. It is recommended
for incoming
inspection,
periodic maintenance,
and to verify specifications.
If the instrument fails any
part
of the test, calibration
and/or repair is indicated.
4-23.
Initial
Procedure
4-24.
Establish the following test
conditions before continuing
with
the
Performance
Test:
1. Allow the unit to
stabilize at an ambient temperature
of 23
±5°C (73
±9°
F).
2. Check and,
if necessary, replace the
fuses and battery.
3. Set the power switch
to ON.
4-25.
Display Test
4-26.
The following
procedure is
used to test
the
operation
of all display digits and
segments:
1.
Select the ft function
and the 20 kfl range.
The display should be blanked
with
the
exception
of the overrange
indicator
(1)
in
the left hand column
and a decimal
point
in the center
of the display.
2. Connect a Decade
Resistor between
the
V
/ft and
COMMON input terminals.
3. Set
the
Decade
Resistor
to 10 kft and
verify
a display
of
10.00
±3 digits.
4. Sequentially
increase the resistance
in 1 . 1 1 kft steps
and verify the operation
of
each digit and
its segments.
5. Disconnect the Decade
Resistor at the input
terminals,
and select the 2000
kft
range.
A
decimal
point should not
be displayed.
6. Sequentially
select the 200, 20 and 2
kft
range.
The decimal point should
appear in the tenths,
hundredths, and
thousandths
position, respectively.
4-27.
Resistance
Test
4-28.
The
operation and accuracy
of the resistance
ranges are tested in
the following
procedure:
1. Connect
the Decade Resistor between
the V/ft
and COMMON input
terminals.
4-6
2.
Refer to Table 4-2, and
select the range and input
conditions specified in
step 1
.
Verify
that the display reading
is within the limits
shown.
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