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Genrad/quadtech model 1657 rlc digibridge
This is the famous Digibridge invented by Henry Hall. What is so special about the Digibridge? For one thing, it never needs calibration! All measurements, resistive, capacitive, and inductance, are derived from 3 precision resistors and a crystal controlled oscillator! It's simple, and it works!
For more information about Henry and the Digibridge, see:
http:// /pdf/Datasheets/Application%20Notes/12-Henry%20Hall%20Digibridge%20Patent-Digibridge.pdf
