Keithley 2461 Reference Manual

Appendix
C: Status model Model 2461 Interactive SourceMeter® Instrument
Reference Manual
C-12 2461-901-01 A/November 2015
Status Byte Register diagram
The Status Byte Register consists of two 8-bit registers that control service requests, the Status Byte
Register and the Service Request Enable Register. These registers are shown in the following figure.
Figure 187: Model 2461 Status Byte Register
The bits in the Status Byte Register are described in the following table.
Bit
Decimal
value
Bit name When set, indicates the following
has occurred:
0 1 Measurement summary Bit (MSB) An enabled questionable event
1
2
Not used
Not applicable
2
4
Error available (EAV)
An error is present in the error queue
(warning and information messages do
not affect this bit)
3
8
Questionable summary bit (QSB)
An enabled questionable event
4
16
Message available (MAV)
A response message is present in the
output queue
5
32
Event summary bit (ESB)
An enabled standard event
6 64 Request for service (RQS)/Master summary
status (MSS)
An enabled summary bit of the Status
Byte Register is set; depending on
how it is used, this is either the
Request for Service (RQS) bit or the
Master Summary Status (MSS) bit
7
128
Operation summary bit (OSB)
An enabled operation event

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