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AFE4300: unstable measurement value

Part Number: AFE4300

Hello, I am a researcher at Seoul Asan Medical Center in Korea.

I am currently making impedance kits using AFE4300 chips.

But I have a problem.

At first, the AFE4300 board was used for operation.

When tried using reference resistance as shown in user-guide in the past, the value came out normally.

And then, I have formed a new PCB using AFE4300 chip.

Similarly, circuits were constructed using known resistors and capacitors.

When making measurements, the measurements were programmed to be repeated in order of 8k - 16k - 32k - 64k - FWR every 0.5s.

However, the value is output unstable at 64 kHz.

Can you tell why?

I will attach a code if necessary.


Thank you for reading.