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The 3468A
self test performs several checks on the digital and A/D converter cir-
cuitry of the instrument. A failure in any of these four areas is indicated by an er-
ror message
in the display. When
the self test is complete, the 3468A
resets to
its turn-on state.
Do This
press:
wESIY
This
initiates
the
functional
tests
of
the digital circuitry in the 3468A. The
SELF TEST starts by turning every seg-
ment in the display on (except the top
dot on the colon) for about 2 seconds.
Following
this,
a complete
power-on
SELF
TEST
is performed.
If the test
passes,
the
3468A
returns
to
its
power-on state. If the test fails, an er-
ror message appears on the display in-
stead.
After
the
error
message
is
displayed,
the
3468A
attempts
to
operate normally. The turn-on state for
the 3468A is:
Function:
DC volts
Range:
Autorange on
Display:
5 1/2 digits
Trigger:
Internal trigger
Auto-Zero:
on
|
Table 2-6. Self Test Error Messages
ERROR 1 - Calibration RAM error. This may indicate that only certain func-
tion and range combinations are not calibrated as indicated by
the CAL" annunciator. However, the 3468A will continue to
operate correctly on all other functions and ranges where the
CAL annunciator is not lit.
ERROR
2
-—-
Internal microprocessor RAM error
ERROR
4
-—
Internal microprocessor ROM error
ERROR
8
A/D Converter error
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