mtxx
Junior Member level 3
the formula for a simple capacitor is well known,
C = er*eo * area / (distance)
I'm trying to determind the permittivity of a dielectric using a parallel plate capacitor method.
unfortunately i'm not getting accurate results, i did some reading and i came across this.
in some places, there is an extra constant in the capacitance formular.
https://www.edaboard.com/threads/164509/
εr=C*h/(8.84*W*L)
as seen above, there is an extra factor of 8.84
in this literature,
there is extra 0.225 factor.
**broken link removed**
Permittivity =Cs.t / 0.225A
where:
cs= capacitance in picofarads
t = avg. thickness of specimen in inches
A = effective area of specimen in square inches
are these constant some kind of fringging capacitance correction?
what are they?
C = er*eo * area / (distance)
I'm trying to determind the permittivity of a dielectric using a parallel plate capacitor method.
unfortunately i'm not getting accurate results, i did some reading and i came across this.
in some places, there is an extra constant in the capacitance formular.
https://www.edaboard.com/threads/164509/
εr=C*h/(8.84*W*L)
as seen above, there is an extra factor of 8.84
in this literature,
there is extra 0.225 factor.
**broken link removed**
Permittivity =Cs.t / 0.225A
where:
cs= capacitance in picofarads
t = avg. thickness of specimen in inches
A = effective area of specimen in square inches
are these constant some kind of fringging capacitance correction?
what are they?