2400S-903-01 Rev. E / September 2011 Return to Section Topics 1-33
Series 2400 SourceMeter® Quick Start Guide Section 1: Introduction
Math functions
The SourceMeter has five built-in math functions; power, offset compensated ohms, varistor alpha,
voltage coefficient and percent deviation. After a math function is configured and enabled, it can
be selected by pressing the FCTN key (MATH annunciator displayed).
Power
Calculates and displays power using the measured voltage (V) and measured current (I) values as
follows:
Power = V × I
Use the following menu sequence to enable the power math function:
Press CONFIG > press FCTN > select POWER
This math function can now be selected by pr
essing the FCTN ke
y.
Offset-compensated Ω
Thermal EMFs can corrupt low-resistance measurements. An offset-compensated Ω
measurement cancels out unwanted offset by performing the following 2-point measurement
process:
Offset-Compensated Ω = ΔV / ΔI
where: ΔV = V2 - V1
ΔI = I2 - I1
V1 and I1 are V and I measurements with the source set to a specific level.
V2 and I2 are V and I measurements with the source set to a different level (typically zero).
Select the desired source function (V or I), and use the following menu sequence to configure and
enable the offset-compensated Ω math function:
Press CONFIG > press FCTN > select OFF COMP OHMS
After selecting OFF COMP OHMS, you will
be prompted to enter the two source values.
This math function can now be selected by pressing the FCTN ke
y.
Table 1-18
Command sequence for Limit 2 test example
Command* Comments
*RST Restore GPIB defaults.
:SENS:FUNC “RES” Select ohms meaurement function.
:CALC2:LIM2:STAT ON Enable Limit 2 test.
:CALC2:FEED RES Use ohms for limits comparison.
:CALC2:LIM2:LOW 950 Set lower limit to 950Ω.
:CALC2:LIM2:UPP 1050 Set upper limit to 1050Ω.
:OUTP ON Turn output on.
:INIT Trigger reading.
:CALC2:LIM2:FAIL?
Query result of Limit 2 test (0 = pass, 1 = fail).
:OUTP OFF Turn output off.
*SourceMeter must be addressed to talk after sending :CALC2:LIM2:FAIL? to acquire test result.
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