Keithley 2461 Reference Manual

Model 2461
Interactive SourceMeter® Instrument Reference Manual Section 8:
TSP command reference
2461-901-01 A/November 2015 8-95
bufferVar.times
The time when the instrument made the readings. See
bufferVar.times (on page 8-37).
bufferVar.timestamps
The timestamps of readings stored in the reading buffer. See
bufferVar.timestamps (on page 8-38).
bufferVar.relativetimestamps
The timestamps, in seconds, when each reading occurred
relative to the timestamp of reading buffer entry number 1. See
bufferVar.relativetimestamps (on page 8-28).
bufferVar.sourceunits
The units of measure of the source. See bufferVar.sourceunits
(on page 8-32).
bufferVar.seconds
The nonfractional seconds portion of the timestamp when the
reading was stored in UTC format. See bufferVar.seconds (on
page 8-29).
bufferVar.fractionalseconds
The fractional portion of the timestamp (in seconds) of when
each reading occurred. See bufferVar.fractionalseconds (on
page 8-24).
bufferVar.units
The unit of measure that is stored with readings in the reading
buffer. See bufferVar.units (on page 8-40).
Example 1
reset()
testData = buffer.make(200)
format.data = format.ASCII
format.asciiprecision = 6
trigger.model.load("SimpleLoop", 6, 0, testData)
trigger.model.initiate()
waitcomplete()
printbuffer(1, testData.n, testData.readings, testData.units,
testData.relativetimestamps)
Reset the instrument.
Set the data format and ASCII precision.
Use trigger model SimpleLoop to create a 6 count loop with no delays that stores data in the reading buffer
testBuffer.
Start the trigger model, wait for the commands to complete, and output the readings.
Use of testData.n (bufferVar.n) indicates that the instrument should output all readings in the reading
buffer. In this example, testBuffer.n equals 6.
Example of output data:
1.10458e-11, Amp DC, 0.00000e+00, 1.19908e-11, Amp DC, 1.01858e-01, 1.19908e-11, Amp DC,
2.03718e-01, 1.20325e-11, Amp DC, 3.05581e-01, 1.20603e-11, Amp DC, 4.07440e-01, 1.20325e-
11, Amp DC, 5.09299e-01
Example 2
for x = 1, testData.n do
printbuffer(x,x,testData, testData.units, testData.relativetimestamps)
end
Using the same buffer created in Example 1, output the readings, units and relative timestamps on a separate
line for each reading.
1.10458e-11, Amp DC, 0.00000e+00
1.19908e-11, Amp DC, 1.01858e-01
1.19908e-11, Amp DC, 2.03718e-01
1.20325e-11, Amp DC, 3.05581e-01
1.20603e-11, Amp DC, 4.07440e-01
1.20325e-11, Amp DC, 5.09299e-01

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