Conect your special cap into an oscillator circuit and measure frequency
change. A wheatstone bridge will have to be rebalanced with each change in
capacitance.

I am assuming that your "special cap" will be moving a bit faster than you
can balance; specifically since you mentioned frequency.

Once frequency is measured, you can calculate the capacitance. What is the
range of your cap?



wrote in message
oups.com...
All,
I am trying to use a wheatstone capacitance bridge to measure a very
special capacitor that will change value in some frequency. To be
precise, the gap between the capacitor plates will shake back and forth
in a known frequency. I need some knowledge about the noise and sample
rate of the capicitance bridge, so that I know I got a good data. Any
idea about what reference book I should read. Thank you.

UC Berkeley
Low temperature lab
LiHong Herman