Appendix A. CS110 Measurement Status Codes
Status codes 11 through 16: Measurement warnings and errors.
status = 11
, Leakage current exceeds compensation range of
±
4.2 nA. Return
measured Efield value.
status = 12
Failed charge-amplifier self check. Return NAN instead of
measured Efield value.
status = 13
, Large closed shutter offset voltage. Vos >
⏐
1.00 V
⏐
. Return NAN
instead of measured Efield value.
status = 14
, Motor move error. Incorrect number of motor steps to close shutter.
Return NAN instead of measured Efield value.
status = 15
, Motor move error. Encoder UPCNTs < 24 or > 26. Encoder
DNCNTs < 24 or > 26, or don’t find home when closing. Return NAN
instead of measured Efield value.
status = 16
, Can’t properly position shutter. Return NAN instead of measured
Efield value.
Status code 11 returns the measured Efield value because the electric field
computation algorithm compensates for leakage current, even if it exceeds
±
4.2
nA, although maximum signal amplitude becomes limited.
Consequently,
cleaning of the instrument is recommended if status code 11 persists for long
periods of time.
Status codes 12 through 16 all cause the measured electric field to be set to NAN
in order to prevent the use of possible erroneous measurements. The priority of
codes 11 through 16 increases with increasing values, although codes 8, 9 and 10
are higher priority.
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