MULTIPLE-CHANNEL TELEMETRY DEVICE Russian patent published in 1999 - IPC

FIELD: CAM equipment, in particular, for ocean measurements. SUBSTANCE: device has resistor detectors, contacts of code request relays, twisted pair measuring transmission line, current generator, first and second operational amplifiers, recorder, contacts of compensation relay, and memory capacitor. Resistor detectors are by-passed by opening contacts of code request relays and are connected in series to measuring transmission line through closing contacts of code request relays, which are connected to inverse input of first operational amplifier and current generator. Output of first operational amplifier is connected to inverse input of second operational amplifier, which direct input is connected to zero potential terminal and which output is connected to through closing contacts of compensation relay is connected to second terminal of memory capacitor and direct input of first operational amplifier. Output signal of device is independent from resistance of twisted pair transmission line. EFFECT: increased precision of measuring in wide working temperature range. 1 dwg