Keithley 2651A Reference Manual

Model 2651A High Power System SourceMeter® Instrument Reference Manual Section 7: Command reference
2651A-901-01 Rev. A / March 2011 7-23
Details
The reading buffer fill count sets the number of readings to store before restarting at index 1. If the value is zero
(0), then the capacity of the buffer is used. Use this attribute to control when the SMU restarts filling the buffer at
index 1, rather than having it restart when the buffer is full.
If the bufferVar.fillcount attribute is set to a value higher than the capacity of the buffer, after storing the
element at the end of the buffer, the SMU will overwrite the reading at index 1, the reading after that will overwrite
the reading at index 2, and so on.
This attribute is only used when the bufferVar.fillmode attribute is set to smuX.FILL_WINDOW.
Example
smua.nvbuffer1.fillcount = 50
Sets fill count of dedicated reading
buffer 1 to 50.
Also see
bufferVar.fillmode (on page 7-23)
bufferVar.fillmode
This attribute sets the reading buffer fill mode.
Type TSP-Link accessible Affected by Where saved Default value
Attribute (RW) Yes Not applicable Not applicable smuX.FILL_ONCE
Usage
fillMode = bufferVar.fillmode
bufferVar.fillmode = fillMode
fillMode
The reading buffer fill mode; set to one of the following:
• 0 or smuX.FILL_ONCE: Do not overwrite old data
• 1 or smuX.FILL_WINDOW: New readings restart at index 1 after acquiring reading at
index bufferVar.fillcount
bufferVar
The reading buffer; can be a dynamically allocated buffer (user-defined), or a
dedicated reading buffer (such as smua.nvbuffer1)
Details
When this attribute is set to smuX.FILL_ONCE, the reading buffer will not overwrite readings. If the buffer fills up,
new readings will be discarded.
When this attribute is set to smuX.FILL_WINDOW, new readings will be added after existing data until the buffer
holds bufferVar.fillcount elements. Continuing the sequence, the next reading will overwrite the reading
at index 1, the reading after that will overwrite the reading at index 2, and so on.
Example
smua.nvbuffer1.fillmode = smua.FILL_ONCE
Sets fill mode of dedicated reading
buffer 1 to fill once (do not overwrite
old data).
Also see
bufferVar.fillcount (on page 7-22)

Keithley 2651A Specifications

General

Brand	Keithley
Model	2651A
Category	Measuring Instruments
Language	English