TSP #273 - I Bought a Bridge! World's Most Accurate Capacitance Bridge Theory, Teardown & Experiment
In this episode Shahriar dives into the concept of a capacitance bridges. In particular, the Andeen-Hagerling AH2500A Ultra-Precision Capacitance Bridge:
https://www.andeen-hagerling.com/ah2500a.htm
The theory of operation is explained in details alongside a comparison with more traditional LCR meters. A simple replica transformer-based bridge circuit is also used to demonstrate the principle operation using a Zurich-Instruments MFIA lock-in amplifier. The teardown of the unit provides further insight into the engineering design of the instrument.
The capacitance bridge is also used to measure small shifts in a parallel plate capacitor. Furthermore, a complete set of air capacitor standard modules are calibrated & adjusted using the bridge as a standard.
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