Very logical explanation on low calue C3

[abdulbadii]

Any clear logical explanation on the function of C3 sides the C of device under test ?

 

[Nigel Goodwin]

It's simply a coupling capacitor - only a low value is needed, as you test ESR at 100KHz.

 

[abdulbadii]

what's a coupling capacitor all about ?

 

[Nigel Goodwin]

what's a coupling capacitor all about ?

Passing AC and blocking DC.

 

[JimB]

what's a coupling capacitor all about ?

It couples the signal from one stage to the next stage.

JimB

 

[Nigel Goodwin]

If you know zero about electronics why are you looking at building an ESR meter?.