BNC 1201 - 6 1/2 Digit Digital Multimeter - Manual (Page 107)

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Warning! Erroneous self-test failures may occur if the setting of
power line voltage is incorrect. Errors may also occur because of signals
present on the input terminal (front and rear) during self-test procedure.
Long test leads can act as an antenna causing pick-up of ac signals.
How to execute Self-test
Users may execute a complete self-test by front panel operation. This
test procedure provides more tests for the hardware of 1201 than the
power-on tests. Please follow the Figure 4-38 direction and procedure
below to perform the complete self-test.
Figure 4-38
Procedure: MENU  SYSTEM  SELF TEST
After self-test procedure, the result, PASS or FAIL, will be shown. If the
result is FAIL, the “ERR” annunciator on the display panel will be lit, and
error codes will be stored. You can check the error codes by the following
procedure.
Procedure: MENU  SYSTEM  ERROR
The descriptions of self-test procedures are listed below including test
number, purpose, test setup, and failure criteria.
601 Front panel does not respond The main CPU U1601 attempts to
establish serial communications with the front panel processor U3.