2600S-901-01 Rev. C / January 2008
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12-61
Series 2600 System SourceMeter® Instruments Reference Manual
Section 12: Instrument Control Library
smuX.measure.lowrangeY
X = SMU channel (a or b)
Y = SMU measure function (v or i)
where v = voltage, i = current
Attribute
Lowest measure range that will be used during autoranging.
Usage
rangeval
= smuX.measure.
lowrangeY
-- Reads low range.
smuX.measure.
lowrangeY
=
rangeval
-- Writes low range.
rangeval
Set to the lowest voltage or current measure
range.
Remarks
•
This attribute is used with auto-ranging to put a lower bound on the range used.
Lower ranges generally require greater settling times. By setting a low range value,
measurements might be able to be made with less settling time.
•
If the instrument is set to auto range and it is on a range lower than the one
specified, the range will be changed to the range specified.
Details
See “
” in
Also see
Example
Sets volts lowrange for Model 2601/2602 SMU A to 1V:
smua.measure.
lowrangev
=
1
smuX.measure.nplc
X = SMU channel (a or b)
Attribute
Integration aperture for measurements.
Usage
nplc
= smuX.measure.
nplc
-- Reads nplc.
smuX.measure.
nplc
=
nplc
-- Writes nplc.
nplc
Set from 0.001 to 25.
Remarks
•
The integration aperture is based on the number of power line cycles (NPLC),
where 1PLC for 60Hz is 16.67msec (1/60) and 1 PLC for 50Hz is 20msec (1/
50).
•
The reset function sets the aperture to 1.0.
Details
See “
Example
Sets integration time for SMU A (0.5/60 seconds):
smua.measure.
nplc
=
0.5
smuX.measure.overlappedY
smuX.measure.overlappediv
X = SMU channel (a or b)
Y = SMU measure function (v, i, r or p)
where:
v = voltage, i = current, r = resistance, p = power
Function
Starts an asynchronous (background) measurement.
Usage
There are two ways to use this function:
smuX.measure.overlappedY(rbuffer)
smuX.measure.overlappediv(ibuffer, vbuffer)
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.