Keithley 2651A Reference Manual

Section 7: Command reference Model 2651A High Power System SourceMeter® Instrument Reference Manual
7-202 2651A-901-01 Rev. A / March 2011
Usage
smuX.measure.overlappedY(rbuffer)
smuX.measure.overlappediv(ibuffer, vbuffer)
X
Source-measure unit (SMU) channel (for example,
smua.measure.overlappedv() applies to SMU channel A).
Y
SMU measurement type (v = voltage, i = current, r = resistance, p = power)
rbuffer
A reading buffer object where the reading(s) will be stored.
ibuffer
A reading buffer object where current reading(s) will be stored.
vbuffer
A reading buffer object where voltage reading(s) will be stored.
Details
This function will start a measurement and return immediately. The measurements, as they are performed, are
stored in a reading buffer (along with any ancillary information also being acquired). If the instrument is
configured to return multiple readings where one is requested, the readings will be available as they are made.
Measurements are in the following units of measure: v = volts, i = amperes, r = ohms, p = watts.
The smuX.measure.overlappediv() function stores current readings in ibuffer and voltage readings in
vbuffer.
This function is an overlapped command. Script execution will continue while the measurement(s) is made in the
background. Attempts to access result values that have not yet been generated will cause the script to block and
wait for the data to become available. The waitcomplete() function can also be used to wait for the
measurement(s) to complete before continuing.
If a given reading buffer contains any data, it will be cleared prior to taking any measurements, unless the
reading buffer has been configured to append data.
Example
smua.measure.overlappedv(smua.nvbuffer1)
Starts background voltage
measurements for SMU channel A.
Also see
smuX.measure.Y() (on page 7-205)
smuX.nvbufferY
(on page 7-208)
waitcomplete()
(on page 7-374)
Reading buffers
(on page 3-6)
smuX.measure.rangeY
This attribute contains the positive full-scale value of the measure range for voltage or current.
Type TSP-Link accessible Affected by Where saved Default value
Attribute (RW) Yes Instrument reset
SMU reset
Recall
Saved setups Current: 100e-9 (100 nA)
Voltage: 100e-3 (100 mV)

Keithley 2651A Specifications

General

Brand	Keithley
Model	2651A
Category	Measuring Instruments
Language	English