Test and Measurement – Page 7 – Simple Circuit Diagram

Resistance Thermometer Current Loop Transmitter

January 21, 2011 Rust

Resistance temperature sensor (RTD, resistive temperature device) comes in NTC (negative temperature coefficient) and PTC (positive temperature coefficient) forms. A schematic diagram below show a signal conditioner circuit for such thermometer. This sensor conditioning circuit works in current mode (current loop) and the amplifier inside gives a current output that is inversely proportional with the sensor’s resistance. This temperature transmitter […]

Coincidence Detector for Logic Signals

January 20, 2011 Rend

This is a coincidence detector circuit. This circuit is very useful for monitoring complex logic circuits. This circuit has two inputs, A and B. if A and B are both low, red LED will be on, and green will be on when A and B are both high. The indicator will be off when one of input is low and […]

Category: Test and Measurement Tags: Logic Probe

4-20mA Current Loop Bridge Sensor Transmitter

January 17, 2011 Rust

Bridged resistive sensing elements is common in resistive type sensors/transducers. This sensor type need a biasing voltage to operate. LM10 provide low reference voltage, which is suitable for powering usually low resistance bridge type sensors such as strain gauges. The reference voltage is not only supply the power to the bridge but also provide offset to set the output at […]

Category: Signal Processing, Test and Measurement Tags: Current Loop, Signal Conditioner

2 Transistors Signal Generator For Signal Tracing

January 15, 2011 Rend

Signal tracing is a method to find failure section of electronic circuit. This method is very common in troubleshooting audio electronics, since the tool for injection and monitoring will be very simple and cheap. The tracing method is done by injecting a signal source at one point and monitoring the response at other point, where the signal is assumed to […]

Category: Audio and Music, Test and Measurement Tags: Signal Injector, Signal Tracer

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