LC_Meter

[Adam2014]

the ratio not constant and the output not stable for values above 10nf

 

[alec_t]

Sounds like you might need a look-up table to handle the ratio, and averaging to handle the instability.

 

[Adam2014]

depending on this figure https://www.rfcandy.biz/communication/pic/lcimpsch.gif
what the difference between AC coupling/decoupling reactance ?
is ac decoupling connected to ground ?

 

[Adam2014]

as same figure #43 how c6 charge and discharge ? and where ?
what its initial charge ?

 

[Adam2014]

how does R10 , C10 integrator work ?
it's output is 2.5 volt
so i can replace it with voltage divider ?

 

[Adam2014]

please in posts 45/44/43 i have some questions i need its answer ?

 

[alec_t]

what the difference between AC coupling/decoupling reactance ?

For a capacitor, reactance is the cap impedance as given by X=1/(2.pi.f). In the schematic linked to, C1/2/3 are decoupling cap examples and C9 is a coupling cap.

is ac decoupling connected to ground ?

Usually.

how c6 charge and discharge ? and where ?

Charge and discharge is via connected components, e.g. C9, L1, Cx etc, and internal leakage.

what its initial charge ?

Probably close to zero Coulombs when the power supply is absent.