Teledyne LeCroy T3MIL Ohmmeter, 5 mΩ Max, 0.1 μΩ, 4 Wire

Teledyne Test Tools introduces a brand new series of D.C. Milli-Ohm meters. The T3MIL series offers two models T3MIL50 and T3MIL50X, which features a 3.5-inch TFT display with a measurement accuracy of 0.05 %, maximum 50,000 count measurement display and sampling rate of 60 readings per second. The T3MIL series also provides four wire measurement as well as temperature measurement and temperature compensation functions to meet the requirements of low resistance measurement applications.

The T3MIL50X provides Dry circuit and various drive modes (DC+, DC-,Pulsed, PWM) for measurement applications on different materials. The pulsed current output mode is suitable for interacting conductors of different materials to reduce the influence of thermal EMF on the measurement. Thermal EMF is caused by electric potential difference generated from different conductors acting on different temperatures while conducting low resistance measurements.

Excessive current through the contacts during testing can cause a physical change in the contact area on a microscopic level. Current can cause heating, which can soften or melt the contact points and surrounding area. The contact area enlarges, resulting in a reduction in resistance. To avoid “wiping away” the con taminates, a dry circuit method is used for testing. A dry circuit is one in which the voltage and current are limited to levels that can't cause changes in the physical and electrical condition of the contact junction. Generally, the open circuit voltage is 20 mV or less and the short circuit current is 100 mA or less. The Dry circuit measurement can also

Dry circuit testing

Production testing of contact resistance of switches, relays, connectors, cables, and other low Resistance Devices