GMC-I Messtechnik GmbH 21
3.7.4 Performing the Self-Test
Display, lamp and relay functions, as well as options, are
automatically tested and results are displayed.
Before starting the self-test, both test probes must be
disconnected from any devices under test, and must be
kept separate from one another. It is also essential to
assure that no voltage is present at the test probes.
Error Messages and their Meanings
Test results OK or option installed (high-voltage module)
Error message: Test failed, device under test defective or
option not installed
ROM Checksum
A software error may have occurred. Install the included system
software to the test instrument again. If problems persist, we
recommend calling our product support hotline.
CAL Checksum
This portion of the self-test examines the calibration subassembly.
Even if the CAL checksum is OK, this does not mean that the
PROFITEST 204+ need not be calibrated in accordance with the
prescribed schedule.
If this portion of the self-test is failed, the instrument must be
returned to the manufacturer for re-calibration.
Temperature Inside the Test Instrument
The temperature limit has been intermittently exceeded inside the
instrument. The measuring mode is disabled until the temperature
drops back into the allowable range.
Do not start the next measurement until the temperature error has
been cleared.
High-Voltage Module
An installed high-voltage module is recognized automatically.
Proceed as follows if an error message is read out for this portion
of the self-test, even though a high-voltage module has been con-
nected:
Check the connections at both instruments and, above all, make
sure that the signal tubes at the high-voltage module have not
been obstructed or covered.
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