Result bytes, Result bytes: - 1 2 – Fluke 900 User Manual
Page 36
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Seiftest
FLUKE 900 SERVICE MANUAL
Result bytes:
BYTE 0
b7-
b6-
b5-
b4-
b3-
b2-
bl -
bO-
BYTE 1
b7-
b6-
b5-
b4-
b3-
b2-
bl-
bO-
BYTE 2
b7-
b6-
b5-
b4-
b3-
0
0
0
0
Threshold calibration failed. Ignore this bit unless the other bits in this byte
are clear. If they are clear and this bit fails the output of the threshold Op
Amp has too great an offset
Unable to complete test. Something is wrong with the CPU - CIO interface.
The threshold was too high. The output of the Op Amp was greater than
expected by more than the allowable amount
The threshold was too low. The ouQnit of the Op Amp was less than
expected by more than the allowable amoimt
Vcc(IB) is too high ( > 5.2V ). The main Vcc voltage as read at the
Interface Buffer is too high. If this test fails, ALL other selftests are invalid.
Vcc(IB) is too low ( < 4.84V ). The main Vcc voltage as read at the
Interface Buffer is too low. If this test fails ALL other selftests are invalid.
0
0
0
Unable to turn off the reset line. The reset output fiom the Interface Buffer
could not be made to go tri-state.
Unable to drive the reset line low.
Buffer could not be made to go low.
Unable to drive the reset line high.
Buffer could not be made to go high.
The reset output from the Interface
The reset ou^ut from the Interface
Period measured was too long. There are several possible causes. The
25MHz crystal could be oscillating at the wrong frequency, the WSG pal
could be faulty, almost any of the 4 frequency chips could be bad.
Period measured was too short. There are several possible causes. The
25MHz crystal could be oscillating at the wrong fiequency, the WSG pal
could be faulty, almost any of the 4 frequency chips could be bad.
No results obtained from period read. The test has timed out. Something is
wrong with the CPU - CIO interface.
Unable to set up the period read. Something is wrong with the CPU - CIO
interface.
HW oscillator (25MHz) is too fast. There are several possible causes. The
25MHz crystal could be oscillating at the wrong frequency, almost any of the
4 frequency chips could be bad, the 2925 clock generator could be bad, there
could be a problem in the fiequency muxes.
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