I’m trying to measure an impedance built up of a resistance R1 in series with a capacitance C1 and resistance R2 in parallel.
The values are as follows:
R1 = 48.7 Ohm
R2 = 200 Ohm
C1 = 0.1uF
When I do the maths I get 71.88 Ohms @ -47.35deg
I would like to think my maths is right…
When I measure this on the chip I use:
RFB = 81 Ohm
F = 30000Hz to 30200Hz
On default gain and settling settings.
The problem is that the chip says my circuit has an impedance of 100 Ohms @ 0deg.
Can you see what I may be doing wrong in this operation.