B&K Precision 1747 - Manual - Manual (Page 31)

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Full current calibration errors:
Er 50: CC not low
Er 51: CV not high
Er 52: DAC out of range
Er 53: ADC out of range
Er 54: ADC system calibration failed
Er 55: DAC full current constant checksum failed
Er 56: ADC full current constant checksum failed
7.3 Command Errors
“Communication Error” : RS232 framing, parity, or overrun error
“Syntax Error” : invalid syntax was found in the command string
“Out of range” : a numeric parameter value is outside the valid range
for the command