3: Functions and features Model 2461 Interactive SourceMeter® Instrument
3-82 2461-901-01 A/November 2015
Using SCPI commands:
Send the command:
:SENSe:VOLTage:RELative OFF
To set the relative offset for another function, replace VOLTage with CURRent or RESistance.
Using TSP commands:
Send the commands:
smu.measure.func = smu.FUNC_DC_VOLTAGE
smu.measure.rel.enable = smu.OFF
To set the relative offset for another function, replace smu.FUNC_DC_VOLTAGE with
smu.FUNC_DC_CURRENT or smu.FUNC_RESISTANCE.
Calculations that you can apply to measurements
The Model 2461 allows you to apply the following math operations to the measurement:
• mx+b
• percent
• reciprocal (1/X)
Math calculations are applied to the input signal after relative offset and before limit tests. For more
detail on the order of operations, see Order of operations (on page 4-25).
Math operations apply to the selected measure function. If you change the measure function, the
math operation for that function becomes active.
Changing math functions does not clear the reading buffer, which can result in mixed units in the
reading buffer. If you are graphing, this can cause ? to be displayed in the Y-axis. Clear the reading
buffer to remove the mixed units.
mx+b
The mx+b math operation lets you manipulate normal display readings (x) mathematically based on
the following calculation:
mx + b = Y
Where:
• m is a user-defined constant for the scale factor
• x is the measurement reading (if you are using a relative offset, this is the measurement with
relative offset applied)
• b is a user-defined constant for the offset factor
• Y is the displayed result
When the mx+b math operation is active, the unit of measure for the front-panel voltage and current
readings is X and the MATH indicator is displayed to the right of the measurement. For resistance
readings, the units of measure do not change. You cannot change this units designator.
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