You need phase measurements to set up and verifyelectronic devices in amplifiers and in audio, control,ultrasound, and echo systems. Phase measurements can beproblematic, because not many simple, inexpensive phasemeters are available. Moreover, using an oscilloscope is timeconsuming and imprecise. The phase meter described hereuses a standard voltmeter as an output device. It measuresthe phase difference between two signals with better than1% accuracy and it operates to 10MHz. It’s inexpensive tobuild, and it’s simple to calibrate.
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