Stanford Research Systems DS345, Manual

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Troubleshooting
4-4
Gain Off Err 8 Amplitude control DAC's (U109B and U412A) have excessive DC offset (>
±100mV).
Offset G Error 9 The DC offset function gain is more than ±10% from nominal. Can be a
problem with DAC or output amplifier.
Offset O Err 9 Output has excessive DC offset when set to 0 (>±100mV). Can be a problem
with offset control or output amplifier.
Out Gain Err 10 Full scale output is more than ±30% from nominal. Can be due to incorrectly
set waveform DAC reference voltage (VR500 should output -1.00V), bad
Bessel filter, bad amplitude control multiplier, or output amplifier problem.
Prg Data Err 6 Read/write test of modulation RAM (U301) failed. Can be bad RAM, ASIC,
or bus problem.
Sync Cpr Err 12 Sync generator does not produce ±full scale output.
Sys Data Err 3 CPU RAM (U204) failed read/write test.
Sys G DAC Err 8 System amplitude control DAC (U109B) linearity error. Checked at full, 1/2,
1/4, and 1/8 scale.
Trig Error X 7 Error in trigger detection circuits. If x = 1 = triggered signal error, x = 2 = trig-
ger error signal error, and x = 3 = sweeping signal error.
Autocal Errors
These errors messages can be generated by autocal. If the DS345 fails au-
tocal try running the procedure again. Repeated failure can indicate a hard-
ware problem. The parameter limits and number of iteration allowed by auto-
cal are fixed and are set so that all units should easily calibrate within those
limits. The messages are listed alphabetically, also listed is the status value
returned by the *CAL? command.
Message Status Value Meaning
AD Gain Err 3 The A/D converter gain is more than ±5% from nominal.
AD Offs Err 3 The A/D converter offset is too large.
Bes G Cal Er 5 The DC gain of Bessel signal path is outside of -40% to +25% from nominal,
or the calibration did not converge after the maximum allowed number of iter-
ations.
Cal Dly Err 1 The DS345 is not warmed up. Wait until warmed up for at least two minutes
befor starting autocal.
DAC Off Err 4 The waveform DAC's output offset calibration did not converge or went out-
side the ±50mV allowed range.
DBL ERR xx 6 The frequency doubler output offset calibration failed at frequency xx. Out-
put frequency = 312500 Hz * xx.
Offset Cal Err1 4 The dc output offset control offset calibration did not converge, or went out of
range.