Redundant pulse monitoring in electric energy metering system

Reference frequency and low voltage detector circuit

Reference signal differentiating capacitive fluid level gauge

Reference voltage measuring bridge for a device for...

Reflected power alarm for a variable power output antenna...

Reflection coefficient measurements

Reflection type magnetooptic sensor head

Regulator for a direct current power supply

Regulator tester

Relay multiplexing for circuit testers

Relay multiplexing for circuit testers

Relay tester

Relay trouble detecting device

Releasable sensor for faulted circuit detector

Reliable back-up storage of electrical energy meter reading...

Remote battery monitoring systems and sensors

Remote current detector

Remote group metering of electric energy for multistory...

Remote indication low battery voltage enunciator method and...

Remote light indication fault indicator with a timed reset...