Section
VIII
SERVICE GROUP B
Model 3455A
8-B-5.
When
pressing the
TEST
button
of
the
3453A, each
cal constant is measured. The first cons-
tant measured is constant number 13. If constant 13 is within certain limits (which
are
internally
set)
the 3453 A will automatically measure the next constant. If constant 13 is out of its limits
the
self
test
operation will stop. A number 13
will
be displayed on the front panel of the 3433A. In order
to
measure the next cal constant, the TEST button needs to be pressed again. If all the cal constants are
good, a logic check
will
be performed. The 34S3A
will
then display + .8.8. 8. 8.8. 8. 8
when
the self-test
operation is completed. After the self-test operation is finished
it will
automatically start again. To
bring the 3433A
out
of this
loop,
any function key other than TEST needs
to be
pressed.
8-B-6.
When
the 3433A is in the self-test mode, and it fails this test, it
will
stop and display an integer
number.
This number is the number
of the
cal constant
that
fails. To continue
the self-test
operation,
press
the
TEST
button
again. After
all the cal
constant measurements arc
taken, and the 3433A is still
in the
self-test
mode, another measurement is taken.
A
dummy
cal
constant
calculation
is performed
in the
outguard
section of the 3433A. If this
calculation
is correct
(answer
should be
10),
nothing
will
be displayed. The instrument will
then
finish
the
self-test operation.
If the
dummy
calculation is in-
correct, a non-integer number (e.g., 9.998
or
10.002)
will
be
displayed
on
the
front
panel. Again,
to
continue the self-test operation the TEST button needs to be pressed.
8-B-7 When the 3433A is used with the HP-IB system and if any of the cal constants fail, the 3435A
will not output any readings. If only the dummy calculation fails then the dummy calculation answer
will be output on the bus. If the 3433A passes its self-test then a 10
will
be output on the bus.
8-B-8. The 3433A should not be troubleshoot for Auto-Cal malfunctions in the self-test mode. If any
cal constants fails, including the dummy constant, use the cal constant
service procedure
(paragraph
8-B-lO)
for
troubleshooting.
If only
the dummy constant fails
try
replacing
the
ALU’s (A1U28,
30),
and their associated circuits, in the outguard section (schematic 8). If the dummy constant still fails,
go to the Outguard Troubleshooting
Service
Croup
(Service
Group F).
Figure
8-B-L
AutoXil Conmnt
«11 (10 V
OHsat).
Figure
8-8-2. Auto-Cel
Constant #10
(10
V Gain).
8-44
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