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3.13 Self-checks and Failure Displays
(Error codes)
3.13.1 Power-up Self-Check
Every time the instrument is switched ON or the line
voltage reappears after an interruption, the Digibridge
keeps itself busy for a short time going through an
automatic self-check routine. The RLC and QDR
displays indicate in code which check is being per-
formed. It is possible to halt the diagnostic routine and
hold the displayed code by pressing and holding the
[SHIFT] key or other key. Normally these displays
follow one another rapidly.
However, if one of them persists, there has been a
failure in the self check. The nature of the failure
and the proper remedy for each are indicated below.
Normal operation is inhibited in each of these cases.
NOTE: Operation can usually be enabled (in spite
of failure messages other than 88888 or 33333) by
pressing START button. This action is useful to enable
measurements using a test fixture with very large ca-
pacitance or for certain transfer impedance measure-
ments. But, it IS NOT RECOMMENDED unless you
are well aware of what caused the self-check failure.
888888888. The random-access-memory read/write
exercise was imperfect. Try power-up again; other-
wise the remedy is beyond the operator's control;
repair service is required.
77777 xxxx. The detector test was not completed sat-
isfactorily. Be sure that the EXTERNAL BIAS switch
is OFF; try power-up again. Otherwise the remedy
is beyond the operator's control; repair service is
required. (The QDR display provides some service
information indicating in code which of 4 important
digital signals is stuck, and whether high or low.)
66666 xxxx. The detector scale test failed. CPU will
loop on failure. Switch POWER OFF and ON again.
If these remedies are ineffective, repair service is
required.
Operation
555 D xxxx. A signal-strength check failed: When D is
1...4, it indicates the range being checked (withvoltage
= 1.275 V). When D is 5, the range is 4, with voltage
= .075 V. CPU will loop on failure. Be sure that the
EXTERNAL BIAS switch is OFF and check to make
sure that the charged capacitor protective fuse has not
blown (Item 11, Figure 1-3). Recycle power OFF and
ON to exit from loop.
444 E xxxx. A check on test frequency and waveform
failed. For E of 1, 2, 3, 4, 5, 6, the frequency being
checked is 6.06, 6.0, 1.2, 0.48, .0968, .0118 kHz,
respectively. CPU will loop on failure; recycle power
OFF and ON to exit from loop.
33333 xxxx. PROM data checksum test. XXXX =
checksum, which must be zero to pass the test.
222 F XXXX. Calibration constants test. XXXX =
normalized value of constant, which must be within
the limits of 1.000000 +/- 0.78125 to pass the test.
For F = 0, the constant is frequency correction factor.
For F = 1, 2, 3, or 4, it is the conductance of range 1,
2, 3, or 4, respectively.
You can proceed from this power-up self-check failure
(222 F XXXX) and operate the Digibridge, To do so,
press the [C/D] key. Of course, the measured results
are liable to be erroneous; you should then proceed
to obtain service to repair the fault and/or recalibrate,
11111 1111. Failure of the high-speed math chip on
the 1689-9620 high-speed measurement and IEEE/
handler interface option. (This check is performed
only if that option is present.)
You can proceed from this power-up self-check fail-
ure (11111 1111) and operate the Digibridge. To do
so, press the [C/D] key. Interface functions can be
expected to work properly. However, the Digibridge
will operate at its regular speed (as though the high-
speed option were absent) if it has this failure.
1693 RLC Digibridge
101
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