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Two-wire sensors with a current output of 7 mA/14 mA are used to detect broken cables. Other designs provide for an output voltage of around 7 V as soon as the signal frequency drops below 1 Hz. Another method used is to detect a 50 MHz output signal from the sensor when the power supply is periodically modulated at 50 MHz.
Hall effect devices produce a very low signal level and thus require amplification. The vacuum tube amplifier technology available in the first half of the 20th century was too large, expensive, and power-consuming for everyday Hall effect sensor applications, which were limited to laboratory instruments.
A tachometer that can indicate up to 7000 RPM (left) A tachometer (revolution-counter, tach, rev-counter, RPM gauge) is an instrument measuring the rotation speed of a shaft or disk, as in a motor or other machine. [1] The device usually displays the revolutions per minute (RPM) on a calibrated analogue dial, but digital displays are ...
Tachometer: Measures speed of motors Signal analyzer: Measures both the amplitude and the modulation of a RF signal Signal generator: Generates signals for testing purposes Spectrum analyser: Displays frequency spectrum Sweep generator: Creates constant-amplitude variable frequency sine waves to test frequency response Transistor tester: Tests ...
A system for communications where a carrier signal is impressed on power line wiring. carrier wave A radio wave that can be modulated (changed systematically) to carry information to a receiver. Category 3 cable A performance standard for unshielded twisted pair cables for analog voice and low speed data circuits within a building. Category 5e ...
Electronic signals from the ECU to the ICM determine the amount of ignition timing or retard needed to meet engine power requirements. The ECU provides an input signal to the ICM. The ICM has outputs for a tach signal to the tachometer and a high voltage signal from the coil to the distributor. The crankshaft position sensor senses TDC (Top ...
Quantization (signal processing) Range imaging; Scanning SQUID microscope; Single-Photon Emission Computed Tomography (SPECT) Smartdust; SQUID, Superconducting quantum interference device; SSIES, Special Sensors-Ions, Electrons, and Scintillation thermal plasma analysis package; SSMIS, Special Sensor Microwave Imager / Sounder; Structured-light ...
A signal close to the saturation voltage, indicates a short circuit in the sensor or cable. In between these two limits a functional sensor has been detected. The bias voltage is cut off by a coupling capacitor at the instrument input and only the AC signal is processed further. IEPE sensor connected to the input of an instrument
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