I am testing EVAL-AD5940BIOZ for 4-wire bio impedance measurements.
There is issue on measurements frequency. The test environment is follow.
A 1kΩ resistor was connected to EVB. Two probes of oscilloscope are connected to each lead of resistor.
Frequency was measured with subtract function of oscilloscope. (The setting was effective in other BIA AFE test.)
A SensorPal GUI was used to configure EVB.
However, measured frequency is different from setting frequency.
For the 200kHz setting cause a 12.5kHz. For the 100kHz setting cause a 6kHz. It looks like frequency is divided in 16.
I also tried to configure EVB with source code, but the result is same. I also tried to trouble shoot refer to 42page of datasheet.
How can I fix it? Could I get an updated GUI? Or EVB jumper should be adjusted to BIA mode?
On the old pre-released part, the signal frequency is 16 divided. The part available from now on has removed the 16-divider. Are you using our latest SensorPal GUI and part?
Try firstly to use the latest SensorPal from here.
Thank you for your reply.
We have checked evaluation board and software.
The hardware was the latest version and the source code was old version. After using the linked source code, it's working.
Thank you again.
I have one more question.
Now it's working but it's not easy to use. (Test based on source code take times when changing configuration.)
Could I get a working GUI? At the above link, I can't find GUI.
The GUI together with some other useful links can be found here.