Keithley 2601 Reference Manual page 530

Appendix D: Status Model
Questionable Event Registers
As shown in
Commands are summarized in
parameter values. For details, see
appendix.
For example, either of the following commands will set the CAL enable bit (B8):
status.questionable.enable = status.questionable.CAL
status.questionable.enable = 256
When reading a register, a numeric value is returned. The binary equivalent of this value indicates
which bits in the register are set. For details, see
example, the following command will read the questionable enable register:
print(status.questionable.enable)
Questionable Status Register
This register set feeds to bit B3 (QSB) of the Status Byte. The bits used in the Questionable Status
Register set are described as follows:
• Bit B8, Calibration (CAL) — Set bit indicates that calibration is questionable.
• Bit B9, Unstable Output (UO) -- Set bit indicates that an unstable output condition was
detected.
• Bit B12, Over Temperature (OTEMP) — Set bit indicates that an over temperature
condition was detected.
• Bit B13, Instrument Summary (INST) — Set bit indicates that a bit in the questionable
instrument summary register is set.
Questionable Status Calibration Summary
This calibration summary register set feeds to CAL bit B8 of the Questionable Status Register.
Used summary bits for this register include B1 (SMUA) and B2 (SMUB). A set bit indicates that
calibration for a SMU (A or B) is questionable.
Questionable Status Over Temperature Summary
This over temperature summary register set feeds to OTEMP bit B12 of the Questionable Status
Register. Used summary bits for this register include B1 (SMUA) and B2 (SMUB). A set bit
indicates that an over temperature condition was detected for a SMU (A or B).
Questionable Status SMU A Summary Register
This SMU summary register set feeds to bit B1 (SMUA) of the Questionable Status Instrument
Summary Register. Used summary bits for this register include B8 (CAL) and B12 (OTEMP). A set
bit indicates that the corresponding questionable event for SMU A has occurred.
Questionable Status SMU B Summary Register
This SMU summary register set feeds to bit B2 (SMUB) of the Questionable Status Instrument
Summary Register. Used summary bits for this register include B8 (CAL) and B12 (OTEMP). A set
bit indicates that the corresponding questionable event for SMU B has occurred.
Questionable Status Instrument Summary Register
This summary register is fed from the SMU summary registers and then feeds to bit B13 (INST) of
the Questionable Status Summary Register. Used summary bits for this register include B1
D-22
Figure D-4, there are six register sets associated with Questionable Event Status.
Table
""Programming enable and transition
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Series 2600 System SourceMeter® Instruments Reference Manual
D-8. Keep in mind that bits can also be set by using numeric
""Reading registers"" in this appendix. For
registers"" in this
2600S-901-01 Rev. C / January 2008