Achieve Accurate Two Wire Resistance Measurements with the Keysight 34923A & 34924A Multiplexers
Application Notes
This Application Note outlines a method for minimizing the channel path resistance and increasing the accuracy for 2-wire resistance measurements with the 34923A and 34924A reed relay multiplexer modules for the 34980A Data Acquisition unit. This method has the additional beneit of allowing the use of all channels for resistance measurements as in the traditional two wire resistance measurement technique.
The 34923A and 34924A multiplexers have 100 ohm current limiting resistors, as well as backplane relays, PC board trace and internal connector resistances that contribute an offset plus some additional errors to 2-wire resistance measurements The following is a proposed solution to address this issue.