Keithley 2461 Reference Manual

Model 2461
Interactive SourceMeter® Instrument Reference Manual Appendix C:
Status model
2461-901-01 A/November 2015 C-7
Questionable Event Register
You can program the bits in the Questionable Event Register to be cleared or set when an event
occurs.
When an enabled Questionable Event Register bit is set (because the enabled event occurs), the
corresponding bit B0 (MSB) and Bit B3 (QSB) of the Status Byte Register is set. The corresponding
Questionable Event Register Condition Register reflects the present status of the instrument, so it is
set while the event occurs.
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 Understanding bit settings (on page C-16).
You can use the following commands to read and set bits contained in the Questionable Event
Register.
Description SCPI command TSP command
Read the Questionable
Condition Register
:STATus:QUEStionable:CONDition?
(on page 6-136)
status.questionable.condition (on
page 8-227)
Set or read the contents of the
Questionable Event Enable
Register
:STATus:QUEStionable:ENABle (on
page 6-137)
status.questionable.enable (on
page 8-228)
Read the Questionable Event
Register
:STATus:QUEStionable[:EVENt]? (on
page 6-138)
status.questionable.event (on page
8-228)
Request the mapped set event
and mapped clear event status
for a bit in the Questionable
Event Register
:STATus:QUEStionable:MAP (on
page 6-139)
status.questionable.getmap() (on
page 8-229)
Map event to a bit in the
Questionable Event Register
:STATus:QUEStionable:MAP (on
page 6-139)
status.questionable.setmap() (on
page 8-230)
The instrument returns a decimal value that corresponds to the binary-weighted sum of all bits set in
the register. See Event numbers (on page C-10) for information about event numbers. You can use a
copy of the following table to record settings for your instrument.
Bit
Decimal
value
Set Event Clear Event When set, indicates the following
has occurred:
0
1
1
2
2
4
3
8
4
16
5
32
6
64
7
128
8
256
9
512
10
1024
11
2048
12
4096
13
8192
14
16 384

Keithley 2461 Specifications

General

Maximum Current	7 A
Power	100 W
Resolution	6.5 digits
Source Measure Unit (SMU)	Yes
DC Voltage	100 V
Maximum Voltage	100 V
Display	5-inch capacitive touchscreen
Connectivity	USB, GPIB
Software	TSP
DC Current	7 A
Current Source Range	0 to 7 A
Voltage Measurement Range	100 mV to 100 V
Current Measurement Range	10 nA to 7 A
Voltage Measurement Resolution	100 nV