2400S-903-01 Rev. E / September 2011
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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 pressing the FCTN key.
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
=
Δ
V /
Δ
I
where:
Δ
V = V2 - V1
Δ
I = 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 key.
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 950
Ω
.
:CALC2:LIM2:UPP 1050
Set upper limit to 1050
Ω
.
: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.