Measurement system for precise comparison of low ohmic resistance standards

• Low noise current source up to 9 A for use in resistance comparison method.
• Measurement method for low ohmic resistance standards.
• Use of low cost DAQ cards instead of more expensive digital voltmeter.

In this work, an automated precise measurement resistance comparison method for low resistance values in the range from 0.1 mΩ to 10 Ω is presented. The measurement method uses specially built current source, range selector, current reversal module and low cost analog to digital converter. The whole measurement procedure is controlled by LabVIEW program. The realized precise resistance measurement system has achieved precision comparable to more expensive commercial devices.