8600A
4-6.
GENERAL
MAINTENANCE
4-7.
Access/Disasssmbly
4-8.
Use
the
following
procedure
to gain access
to the
interior
of the
8600A.
a. With
the power
switch in the
OFF
position, dis-
connect
the line cord.
b.
Remove
the Phillips screw from
the rear
of
the
instrument
case.
c.
Remove
the instrument
from the
case.
4-9.
The ohms
converter,
ac converter
and input di-
vider printed
circuit boards
can be removed
from the main
board. The
ohms converter
and input divider
boards can
be removed
by pulling
them straight up from
the main
board until they
are free
of
the
connector
pins. The ac
converter,
however,
must be removed
with care because
of
a wire
connection
to the ACMA switch.
When the
ac
converter is free
of the connector
pins it
should then be
held
to one side
so the buss wire
can be disconnected.
NOTE!
When reinstalling
the plug-in boards,
insure
that all
connector pins are properly
aligned
before
seating
the
board.
4-10.
Cleaning
4-11.
Clean the
instrument periodically
to remove
dust,
grease
and other
contamination.
Use the following
proce-
dure:
a. Clean
the interior
with clean, dry air
at
low pressure
(20
psi).
The contaminants on
printed circuit
boards can first
be loosened
by spraying them with
Freon
T.F.
Degreaser (MS
180),
then
removed
with low pressure
air.
b.
Clean the
front panel
and exterior surfaces
with an-
hydrous
ethyl alcohol
or a soft cloth dampened
with a
mild solution of detergent
and water.
4-12.
Fuse
Replacement
4-13.
The power
fuse (F2)
is
located
on the main printed
circuit
board
near the power
transformer.
Access
to
the
fuse
is accomplished
by following the
Access/Disassembly
procedure
found
in this section of
the manual. If replace-
ment is
necessary, use
a
1/8
ampere fuse for
either 1
15V
ac
or
230V ac
power
configuration
(Vi ampere fuse for
8600A—
01),
The
MA HI terminal is a fuse holder for
current overload protection. Using
a
screwdriver,
turn the
terminal
%
turn counterclockwise.
Replace the fuse with
a
2A AGX,
fast
blow, fuse.
4-14.
PERFORMANCE
TESTS
4-15.
The following tests
are intended
for use in
per-
formance testing of
the 8600A. The
tests compare
the
instrument performance
to the
accuracy specifications
and are especially
suited to acceptance
testing of
new in-
struments. Tests
should be
conducted under the following
conditions:
ambient temperature
23°C ±5°C,
relative
humidity less
than 80%.
NOTE!
Tolerances
and test
limits
for
performance
tests are derived
from
the
6
month instrument
specifications.
4-16.
DC Voltage Test
4-17.
Using the dc voltage
calibrator,
sequentially apply
the voltages indicated
in Table
4-2
to the 8600A
V-f
2
input
terminals
and
select
the
ranges
prescribed. The 8600A
should display a reading within
the indicated
limits.
4-18.
Ohms Test
4-19.
Using the
resistor decade,
sequentially apply the
resistance values indicated in
Table
4-3
to
the
8600A
V-f2
input
terminals, and select
the ranges prescribed. The
8600A
should
display a reading
within the indicated limits.
Table
4-2.
DCV PERFORMANCE
TEST
8600A
RANGE
INPUT
REQUIRED
8600A DISPLAY
LIMITS
200mV
+190.00mV
+189.90
to
190.10mV
200mV
-1
9.000m
V
-18.97
to
1
9.03mV
2V +1
.9000V
+1.8995
to
1.9005V
2V
-1.9000V
-1.8995
to
1.9005V
2V
+
.9000V
+.8997
to
.9003V
20V +1
9.000V
+18.995
to
19.005V
20V
-19.000V
-18.995
to
19.005V
200V +1
90.00V
+189.95
to 190.05V
1200V
+1000
,0V
+999.7
to
1000.3V
AUTO
-
.17000V
—169.91
to 1
70.09mV
AUTO
-1.7000V
-1.6996
to
1.7004V
AUTO
-17.000V
-16.996
to
17.004V
AUTO
-170.00V
-169.96
to 170.04V
AUTO
-1000.0V
-999.7
to
1000.3V
4-2
1/77
To Next Page
Loading...
