8-4 Relative and Math 2400 Series SourceMeter
®
User’s Manual
Math operations
Built-in math functions
The SourceMeter has built-in math functions to calculate the following:
•Power
•Offset Compensated Ω
•Varistor Alpha
•Voltage Coefficient
• Percent Deviation
The Power and Percent Deviation math functions use a single voltage and/or current mea-
surement to perform the calculation. The Offset-Compensated Ω, Varistor Alpha, and Volt-
age Coefficient math functions require 2-point measurements to perform a calculation.
Power
This math function calculates power using the measured voltage and measured current
values as follows:
Power = V × I
where: V = measured voltage
I = measured current
Note that power is displayed in watts with “W” in the units field of the display.
Offset-compensated ohms
The presence of thermal EMFs (V
EMF
) can adversely affect low-resistance measurement
accuracy. To overcome these unwanted OFFset voltages, use the Offset-Compensated Ω
measurement method. In general, this method measures resistance (V/I) at a specific
I-Source level and then subtracts a resistance measurement made with the I-Source set to a
different level (typically zero).
NOTE Offset-compensated Ω is also available from the CONFIG OHMS menu struc-
ture. Using Offset-Compensated Ω from this menu automatically selects zero as
one of the source values. For details, see Section 4, “Offset-compensated ohms.”
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