Model 2657A High Power System SourceMeter® Instrument Reference Manual Section 7: TSP command reference
2657A-901-01 Rev. B/December 2012 7-205
Usage
rangeValue = smuX.measure.rangeY
smuX.measure.rangeY = rangeValue
rangeValue
Set to the maximum expected voltage or current to be measured
X
Source-measure unit (SMU) channel (for example, smua.measure.rangev
applies to SMU channel A)
Y
SMU measurement function (v = voltage, i = current)
Details
Reading this attribute returns the positive full-scale value of the measurement range that the SMU is currently
using. Assigning a value to this attribute sets the SMU on a fixed range large enough to measure the assigned
value. The instrument will select the best range for measuring a value of rangeValue.
This attribute is primarily intended to eliminate the time that is required by the automatic range selection
performed by a measuring instrument. Because selecting a fixed range prevents autoranging, an overrange
condition can occur.
If the source function is the same as the measurement function (for example, sourcing voltage and measuring
voltage), the measurement range is locked to be the same as the source range. However, the setting for the
measure range is retained. If the source function is changed (for example, from sourcing voltage to sourcing
current), the retained measurement range is used.
Explicitly setting a measure range will disable measure autoranging for that function. Autoranging is controlled
separately for each source and measurement function: source voltage, source current, measure voltage and
measure current. Autoranging is enabled for all four by default.
Changing the range while the output is off does not update the hardware settings, but querying returns the range
setting that will be used once the output is turned on. Setting a range while the output is on takes effect
immediately.
With measure autoranging enabled, the range is changed only when a measurement is taken. Querying the
range after a measurement returns the range selected for that measurement.
Example
smua.measure.rangev = 200
Selects the 200 V measurement range for SMU channel A.
Also see
Range (on page 2-72)
reset()
(on page 7-155)
setup.recall()
(on page 7-175)
smuX.measure.autorangeY
(on page 7-194)
smuX.reset()
(on page 7-211)
smuX.source.rangeY
(on page 7-224)
smuX.measure.rel.enableY
This attribute turns relative measurements on or off.
Type TSP-Link accessible Affected by Where saved Default value
Attribute (RW) Yes Instrument reset
SMU reset
Recall setup
Not saved 0 (smuX.REL_OFF)
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