Next in our series of FAQs is all things industrial. We will be updating all of our FAQ's as time goes on, so make sure to check back regularly.
Q. What is a 4 terminal measurement?
A. 4 terminal measurement - as the name implies - uses 4 measuring leads instead of the normal 2. Two leads carry the measuring current and the other 2 leads measure the potential across the sample.
Q. Why do I get different readings every time I measure very low resistances?
A. The most common cause of inconsistent readings is the simple fact that the measurement points are not connected in exactly the same place. The measurement points are the points where the potential leads are attached. It is advisable to use a test jig to ensure that exactly the same measurement conditions apply each time a connection is made. Remember also to clean any oxides or dirt from the sample before making the connection.
If you have any questions you want us to answer feel free to email us at info@tester.co.uk.
Written by Bill Earlie at www.tester.co.uk
