7: TSP command reference Series 2600B System SourceMeter® Instrument
7-226 2600BS-901-01 Rev. C / August 2016
smuX.measure.rangeY
This attribute contains the positive full-scale value of the measurement range for voltage or current.
Type TSP-Link accessible Affected by Where saved Default value
SMU reset
Recall setup
Models 2601B/2602B/2604B:
100e-3 (100 mV)
Models 2611B/2612B/2614B/2634B/
2635B/2636B: 200e-3 (200 mV)
Current:
Usage
rangeValue = smuX.measure.rangeY
smuX.measure.rangeY = rangeValue
Set to the maximum expected voltage or current to be measured
Source-measure unit (SMU) channel (for example, smua.measure.rangev
applies to SMU channel A)
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. For example, measuring 10.0 V on the Model
2601B/2602B/2604B 6 V range or measuring 5.0 V on the Model 2611B/2612B/2614B 2 V range
causes an overrange. The value 9.91000E+37 is returned when this occurs.
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.
Model 2601B/2602B/2604B example: Assume the source function is voltage. The source range is 1 V
and you set the measure range for 6 V. Since the source range is 1 V, the SMU performs voltage
measurements on the 1 V range. If you now change the source function to current, voltage
measurements is performed on the 6 V range.
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.
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