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Your cart is empty.This electronic test device takes 12 volts AC as input, and emits a 3.3 volt unipolar square wave that indicates the polarity of the output. This zero-crossing detector has a variety of uses; it was originally designed to serve as part of a system to measure the phase and frequency of electrical power grids. The input is used both to power the device and provide the signal under test. Input is provided on a 5.5mm barrel jack, typical for AC power adapters ("wall warts"). The output is either 3.3V or 0V depending on the polarity of the input. The output is provided on an SMA jack, making it easy to feed into interval counters or other lab equipment. The zero-crossing detector ships with a simple RC filter on the input which rolls off at 100Hz. This is useful for glitch resistance when measuring grid power and delays the response time to polarity changes by 500us. For applications that require faster response time, the filter can be disabled through the removal of one capacitor. More information and sample data can be found at lectrobox.com/zcd
stargazer
Reviewed in the United States on February 19, 2025
While 'everyone knows' that the line (mains) AC frequency is 60 Hz (50 Hz), it is probably not a surprise that it varies throughout the day as thousands (millions) of people make choices about when to brew coffee, turn on air conditioning, etc., and as factories ramp production up or down. Perhaps there are also changes during normal (bring on more solar power? solar eclipse?) and abnormal (major outages) events.Hobbyists and semi-pros can use this device, along with an AC transformer (I used this B00B8861T2), and suitable test equipment (oscilloscope, time interval counter, and/or frequency counter) one can measure and record the AC power frequency (more likely, the time interval) for future analysis.B00B8861T2
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