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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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Summary of Contents for SourceMeter 2400
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