BNC 645 - Manual (Page 109)

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or associated circuitry.
623 Self-test failed; dc offset DAC
624 Self-test failed; null DAC
625 Self-test failed; amplitude DAC
A possible malfunctioning DAC, failed DAC multiplexer (U803) channels,
or associated circuitry.
626 Self-test failed; waveform filter path select relay
627 Self-test failed; -10 dB attenuator path
628 Self-test failed; -20 dB attenuator path
629 Self-test failed; +20 dB amplifier path
These errors indicate that the specified relay is not properly switched or
the attenuator/amplifier does not provide the expected attenuation or
gain. These self-tests use the internal ADC to verify whether the output
path relays, output amplifier (+20 dB), and output attenuators
properly operate or not.
630 Self-test failed; internal ADC over-range; condition
A probable ADC failure.
631 Self-test failed; internal ADC measurement error
A probable ADC failure.
632 Self-test failed; square/pulse DAC test failure
A probable failure of the square/pulse DAC (U1002).
7.7 Calibration Errors
701 Calibration error; security defeated by hardware jumper
The calibration security feature has been disabled by shorting the two
“CAL ENABLE” pads on the internal circuit board.
702 Calibration error; calibration memory is secured
The calibration memory is secured to disallow a calibration from