Keithley 2461 Reference Manual

Section
4: Source-measure considerations Model 2461 Interactive SourceMeter® Instrument
Reference Manual
4-2 2461-901-01 A/November 2015
The current source does not use the sense leads to enhance current source accuracy. However, if
the instrument is in 4-wire sense, the instrument may reach limit levels if you disconnect the sense
leads. When 4-wire sense is selected, you must connect the sense leads. If the sense leads are not
connected, incorrect operation will result.
If you are sourcing and measuring the same function (for example, sourcing current and measuring
current), the measurement range is the same as the source range. This feature is valuable if you are
operating when the source limit has been exceeded. When the source limit has been exceeded, the
programmed source value is not reached. Thus, measuring the source lets you measure the actual
output level. You can also use the source readback function to measure the source. See Source
readback (on page 2-130) for information.
You can set overvoltage protection if there is potential for disconnection of the sense leads. For more
information on overvoltage protection, see Overvoltage protection (on page 2-121).
Figure 143: Current source configuration

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