LRM-10A - Substation micro-ohmmeter kit
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LRM-10 Contact Resistance measurement kit The LRM-10 is a lightweight and portable micro-ohmmeter designed to measure very low resistances from 0.01 µΩ to 200 Ω. It is the most accurate in its category. Much lighter and handier than other equip- ment in its category Shock resistant, it is suitable for all types of applications: work site or laboratory The LCD display is equipped with a backlight to allow work in any conditions Weak current injection for applications that require small measurement contacts Many accessories are available for your ap- plication such as exothermic welding (Cad- weld®), measurements on very small sur- faces, etc... The LRM-10 uses a four cable measurement method which consists of a Current injecting channels (+I, -I) and a Voltage sensing channel (+V, -V). The instrument accurately measures the current injection while simultaneously senses the voltage drop across the DUT, the resistance is then calculated. The current injection measurement along with high impedance voltage sensing input channel, eliminates the error induced by test lead resistances. The instrument’s microprocessor eliminates gaps, noises & parasite voltages influence on the resistance measurements. Thanks to its unique filtering system, the LRM-10 can be used in spite of the presence of intense magnetic fields. APPLICATIONS OPERATION LRM-10 10 Amp high precision micro-ohmmeter Circuit breakers contact resistance Electrical interconnections, such as sockets, switches, circuit breaker contacts, cable joints, battery inter-cell connections and other connection devices, are affected by factors like residual contact force, vibrations, and corrosion. These factors generally succeed in compromising the integrity of contact interfaces, and eventually lead to degradation and failure of all electrical connections. The time-to-failure varies widely depending on the connection types and environment. Failure is always preceded by a significant increase in contact resistance at the electrical interfaces. Battery strap connection resistance Switches contacts resistance Tap Changer contact resistance Cable/Bus bar inspection Power fuses inspection Ground bonding inspection Electrical sockets resistance Lightning rod integrity Railway bond resistance ndb Technologies inc. • 1405 St-Jean-Baptiste, office 111 • Quebec (QC) G2E 5K2 - Canada • Tel: 1(418)877-7701 Fax: 1(418)877-7787 Email: mkt@ndbtech.com

TECHNICAL SPECIFICATIONS Measurement Range Operation temperature Storage temperature 0 to 95% non-condensed Submersible, rain proof >12 000 measurements at 10A (for a cable loop resistivity <50mΩ). > 10 000 measurements, for the other currents. Battery type 12V 1A adapter with sealed connector, available for 110V or 220V LCD 128 x 64, wide ranging temperatures 2.36 x 1.62 in. (60 x 41 mm) 2 back-lighting intensities (100%, 50%) Uses the four point measuring method Automatic current adjustment from 5mA to 10A Automatic stop mechanism of the instrument after 2 min. in idle mode Automatic stop...