Main Question or Discussion Point
I need a very accurate capacitance meter with capabilities down to + .01 puff. Any reccomendations?
What is the application? That's mighty fine accuracy, and it will likely require relatively frequent recalibration/compensation.I need a very accurate capacitance meter with capabilities down to + .01 puff. Any reccomendations?
Even a basic meter will be able to tell you the difference between 1pF and 2pF, and many offer 0.1pF precision.We just need something good. The fluke multimeteres arent cutting it. On second thought, i think I'll settle for 0.1pf. The difference in price for another 10th is astounding.
Basically I wanna be able to tell the difference between a 1pf and a 2pf and i'm afraid that with the kind of accuracy that i'm seeing in meters at that level, it will be difficult.
Capacitance (as well as inductance) is a lumped element property; it is a valid approximation if your component is much smaller (lets say 1/10th) than the wavelength you are are working at but this is often NOT the case at RF frequencies.Two questions:
1) Are you saying capacitance changes with frequency?
2) how can that meter measure true capacitance at "any RF" if it only synthesizes 1 MHz to 3 GHz?