Keithley 2651A Reference Manual

Section 7: Command reference Model 2651A High Power System SourceMeter® Instrument Reference Manual
7-24 2651A-901-01 Rev. A / March 2011
bufferVar.n
This attribute contains the number of readings in the buffer.
Type TSP-Link accessible Affected by Where saved Default value
Attribute (R) Yes Not applicable Not saved Not applicable
Usage
numberOfReadings = bufferVar.n
numberOfReadings
The number of readings stored in the buffer
bufferVar
The reading buffer; can be a dynamically allocated buffer (user-defined), or a
dedicated reading buffer (such as smua.nvbuffer1)
Details
This read-only attribute contains the number of readings presently stored in the buffer.
Example
numberOfReadings = smua.nvbuffer1.n
print(numberOfReadings)
Reads the number of readings stored in
dedicated reading buffer 1.
Output: 1.250000+02
The above output indicates that there are 125
readings stored in the buffer.
Also see
smuX.measure.overlappedY() (on page 7-201)
smuX.measure.Y()
(on page 7-205)
smuX.nvbufferY
(on page 7-208)
smuX.trigger.measure.Y()
(on page 7-238)
Reading buffers (on page 3-6)
bufferVar.timestampresolution
This attribute contains the timestamp's resolution.
Type TSP-Link accessible Affected by Where saved Default value
Attribute (RW) Yes Not applicable Not applicable 1e-6
Usage
resolution = bufferVar.timestampresolution
bufferVar.timestampresolution = resolution
resolution
Timestamp resolution in seconds
bufferVar
The reading buffer; this can be a dynamically allocated buffer (user-defined), or a
dedicated reading buffer (such as smua.nvbuffer1)

Keithley 2651A Specifications

General

Maximum Voltage	40 V
Current Range	0 to 3 A
Resolution	6.5 digits
Resolution (Current)	100 pA
Minimum Current Resolution	100 pA
Power	300 W
Display	5.7-inch color LCD
Type	SourceMeter
Communication Interfaces	USB, GPIB, Ethernet
Interfaces	GPIB, USB, Ethernet
Accuracy (Voltage)	0.02% + 3 mV
Resolution (Voltage)	100 nV
Minimum Voltage Resolution	100 nV