8600A
Table
4-8.
AC VOLTS
CALIBRATION PROCEDURE
STEP
8600A
RANGE
INPUT
VOLTAGE
REQUIRED
INPUT
FREQUENCY
REQUIRED
ADJUSTMENT
8600A
DISPLAY
LIMITS
1 Simultaneously
select the
ACMA and DCV
FUNCTION
switches.
*
2 1200V
none
none R72
-20.0
to
-30.0
3
Select the VAC FUNCTION switch on the front panel.
4
2
1.9000V
500Hz R50
1.8998 to
1.9002
5
2
0.9000V 500Hz
none
.8997
to
.9003
6
200
190.00V
500Hz
none
189.90 to 190.10
200 190.00V 50kHz C2 189.95 to 190.05
2 1.9000V 50kHz C19 1.8995
to
1.9005
9 Repeat
steps
7 and
8
until both are within limits
10
2 1.9000V 100kHz
none 1.8875
to
1.9125
11
2
1.9000V
30Hz
none
1.8950 to
1.9050
20
19.000V 500Hz
18.990
to
19.010
n ,
20 19.000V
50kHz
18.990
to
19.010
14
200mV 1 90.00mV 50kHz 189.80
to
190.20*1
15
200mV 1
90.00mV
500Hz none 189.85
to
190.15*’
16
200mV 39.00mV 500Hz none 38.90 to
39.10*’
17
1200V 1000.0V 500Hz none 998.0 to 1002.0
18
1200V 1000.0V 20kHz
none
996.0 to 1004.0
*
Simultaneous
selection of
both
function
switchesconnects the positive 25mV
AC Converter offset
to
the A-D Converter
auto
zero input.
The A-D Converter action
causes
the
negative display of
STEP 2.
I**
200MV LED
on
the display should be
on.
4-35.
Initial Troubleshooting
4-36.
The
troubleshooting
techniques given below
should
be
completed as
the
first step toward repairing
any apparent
malfunction
in
the
unit.
Improper
opera-
tion may not always
be caused by
failures within the
8600A.
The following reminders of basic fault isolation
techniques
will
help
determine if the cause is the
result
of
an
internal failure or faulty external connection.
a. Carefully check the
8600A
control settings:
some false indications may be caused
by
an
incorrect
or
overlooked
control setting.
b. Check
associated
equipment:
insure that associ-
ated equipment
controls and connections are
correct.
d.
Carefully inspect the
interior of
the
instrument:
check for physically damaged
parts, loose or brok-
en
wires, and improperly
seated plug-in assem-
blies.
4-37
When it has been determined
by
the
above checks
that the
malfunction is within
the
8600A
multimeter, the
following procedure
should be used to
isolate the problem
area. The recommended test equipment for
trouble-
shooting this instrument
is listed in table
4-1
. A
trouble-
shooting flow chart
is included in figure
4-2
as an aid in
repairing
the
instrument. Performance
tests
given
in
the
beginning of this section are referred
to by
paragraph
number
and
table number. Tests
contained in
the
following sections are referred
to by
paragraph number.
In addition portions of the theory of operation section
relevant to the correct operation of
the
circuitry in
question
are referred to
by
paragraph number.
NOTE
Refer
to the appropriate
schematic
for
the
elec-
c. Check the
8600
A
performance: the performance
trical
location
of
test points
specified.
Physical
test (par.
4-14)
will
determine if
the malfunction
test point connectors
may not appear on
some
is
in the
8600
A.
pcbs.
4-6
1/77
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