Keithley 2651A Reference Manual page 770

Appendix E: Status model
SMU A (SMUA)
Calibration (CAL)
Unstable Output (UO)
Over Temperature (OTEMP)
Clearing registers and queues
Commands to reset the status registers and the error queue are listed in the table below. In addition
to these commands, any programmable register can be reset by sending the individual command to
program the register with a 0 as its parameter value.
Commands to reset registers and clear queues
Commands
To reset registers:
*CLS
status.reset()
To clear error queue:
errorqueue.clear()
The instrument automatically clears the output queue when the instrument transitions from the local
control state to the remote control state.
E-12
Model 2651A High Power System SourceMeter® Instrument Reference Manual
Figure 137: Questionable status registers
Questionable Status
Calibration Summary
Register
0
1
2
3
4
5
6
7
8
9
10
Similar registers
11
exists for Over
12
Temperature and
13
Unstable Output
14
15
status.questionable.calibration
(status.questionable.over_temperature)
(status.questionable.unstable_output)
Questionable Status
SMU A Summary
Register
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
status.questionable.instrument.smua
Description
Clears the output queue. Reset bits of status
registers to 0.
Reset bits of status registers to 0.
Clear all messages from error queue.
Questionable Status Register
(questionable/QSR)
+
Calibration (CAL)
Unstable Output (UO)
Over Temperature (OTEMP)
Instrument Summary (INST)
status.questionable
Questionable Status
Instrument Summary
Register
SMU A (SMUA)
+
status.questionable.instrument
0
1
To Questionable
2 Summary Bit (QSB) in
Status Byte (STB)
3
4
5
6
+
7
8
9
10
11
12
13
14
15
0
1
2
3
4
5
6
+
7
8
9
10
11
12
13
14
15
2651A-901-01 Rev. A / March 2011