In this section:
Introduction .............................................................................. 3-1
Equipment required .................................................................. 3-1
Device connections .................................................................. 3-2
Measuring 4-wire resistance with offset compensation ............ 3-4
Introduction
This application example demonstrates how to use the DMM7510 to accurately measure a resistance
device.
To provide the best resistance measurement accuracy, the four-wire (Kelvin) measurement and the
offset compensation methods are used for this test. Offset compensation is a measuring technique
that reduces or eliminates thermoelectric electromotive forces (EMFs) in low-level resistance
measurements. The voltage offsets that occur because of the presence of thermoelectric
electromotive force (V
EMF
) can adversely affect resistance measurement accuracy.
To overcome these offset voltages, you can use offset-compensated ohms.
Equipment required
•
One DMM7510
•
One computer setup for communication with the DMM7510
•
Four insulated cables with banana plugs
•
One device to be tested; the application shown here uses a 20
Ω resistor (actual resistance value
can vary with availability and user discretion)
Section 3
Measuring 4-wire resistance with offset compensation
