@JMFahey "Available everywhere cheap meters typically measure reactance by applying a square wave (way cheaper to generate than a true sinewave) to capacitor and measure voltage available at the other end, across a load."
Indeed, that was what I thought but have never checked. I've seen designs which pump out 5v square waves. Absolutely no use for measuring junction capacitance (except if they are biased at a higher voltage perhaps). So that is why I made a meter which does generate a low voltage sinewave. After all that's basic physics to measure the impedance of a capacitor given the frequency, voltage and current .... Not only that but for a direct reading (well, converting current to capacitance) you need frequencies which are multiples of 1/(2pi) (and then aim for a multiple of 10 mV). Which is neat because those frequencies are just those obtained with RC values in multiples of 10 ...
Indeed, that was what I thought but have never checked. I've seen designs which pump out 5v square waves. Absolutely no use for measuring junction capacitance (except if they are biased at a higher voltage perhaps). So that is why I made a meter which does generate a low voltage sinewave. After all that's basic physics to measure the impedance of a capacitor given the frequency, voltage and current .... Not only that but for a direct reading (well, converting current to capacitance) you need frequencies which are multiples of 1/(2pi) (and then aim for a multiple of 10 mV). Which is neat because those frequencies are just those obtained with RC values in multiples of 10 ...