How do you set up Model 2400 SMU and 2182A Nanovoltmeter for Delta Mode?
A large source of error when making low resistance measurements (e.g. 1 ohm) is thermal EMFs in the circuit. A technique called Delta Mode reduces the thermal EMFs in the circuit. The delta mode method sources current in one polarity and takes a voltage measurement. Then the current polarity is reversed and another voltage measurement is taken. Then the two voltages are basically added together and then divided by two. The result is a normalized measurement without the thermal EMFs.
Model 2400 series SMUs and Model 2182A can be set up for the Delta mode configuration for low resistance measurements.
Use the attached procedure to set up the delta mode configuration for the Model 2400 and 2182A.
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