Keithley 2601 Reference Manual page 315

Series 2600 System SourceMeter® Instruments Reference Manual
Remarks Attempting to perform a contact check measurement when any of the following
conditions exists will generate an error:
• Output is off in High-Z mode.
• Current limit set to less than 1mA.
Details See Section 3
Also see smuX.contact.speed
Note: 2635/36 does not have contact check
smuX.contact.speed
Function The speed setting for contact check measurements.
Usage
speed_opt = smuX.contact.speed
smuX.contact.speed = speed_opt
Set speed_opt to one of the following:
0 or smuX.CONTACT_FAST
1 or smuX.CONTACT_MEDIUM
2 or smuX.CONTACT_SLOW
Remarks This setting controls the aperture of measurements made for contact check. It does not
affect the smuX.measure.nplc aperture setting.
The speed setting can have a dramatic effect on the accuracy of the measurement, as
reflected in the specifications.
Details See Section 3
Example Set contact check measurements on SMU A for higher accuracy:
smua.contact.speed = smua.CONTACT_SLOW
Note: 2635/36 does not have contact check
smuX.contact.threshold
Function Resistance threshold for the smuX.contact.check function.
Usage smuX.contact.threshold = rvalue
rvalue = smuX.contact.threshold
rvalue
Remarks The default threshold is 50Ω. The threshold should be set to less than 1kΩ.
Details See Section 3
Also see smuX.contact.check
Set the contact check threshold for SMU A to 5 Ω:
Example
smua.contact.threshold = 5
Note: 2635/36 does not have contact check
smuX.makebuffer
Function Creates a RAM buffer.
Usage
mybuffer = smuX.makebuffer(buffersize)
buffersize
Remarks • RAM reading buffers can be allocated dynamically. These are created and allocated with
the
smuX.makebuffer(buffer)
readings the buffer can store.
• Dynamically allocated reading buffers can be used interchangeably with the
smuX.nvbufferY
• A RAM buffer can be deleted using nil. The following command deletes mybuffer:
• mybuffer = nil
Details See "Reading
2600S-901-01 Rev. C / January 2008
for connections.
X = SMU channel (a or b)
for connections.
X = SMU channel (a or b)
-- writes the threshold
-- reads the threshold
-- Set to the resistance, in ohms, above which
for connections.
X = SMU channel (a or b)
Number of readings that can be stored.
function
buff
ers.
buffers" in Section 7.
Return to Section Topics
contact check should fail
, where buffersize
Section 12: Instrument Control Library
i
s the number of
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