FFT of Ch1/Ch2

[GroupPower]

Hi,

I was wondering if ADP3450 could be used for a test that I have to configure. I need to:

- Create a 70 Hz sin wave voltage - capture this on Ch1

- Apply that voltage across a resistor and sample the current (there will be separate sensor and the output of the sensor is a voltage that represents the current)

- The sampled current will be captured on Ch 2

- The circuit also has a voltage source at 60 Hz that presents noise 

- Now I want to validate the value of the resistor by dividing Ch1 over Ch2 . 

- Note that there will be a significant noise at 60 Hz so i need to do the division of Ch1/Ch2 in a frequency domain and look at the results at 70 Hz frequency only

in other words, I require some sharp bandpass filtering (can the software do this?) right at 70 Hz on the input channels 

[attila]

Hi @GroupPower

The device can perform simple average filter but advanced filtering is available in the application.

You could capture large amount of data with Recording mode:
- AD2 up to about 1-2MHz limited by USB bandwidth
- ADP3450 up to 128M @ 125MHz on 1 channel or 32M @ 31.25MHz on 4 channels.

[GroupPower]

Thank you for your response, just to clarify:

- you generated the 70 and 60 Hz signals with this unit?

- there is no option to view the Math output live/real time - correct? the Math only works on the pre-recorded signals? 

Thanks

 

[attila]

Hi @GroupPower

Yes, 70+60Hz. See the peaks in the FFT of C1
Correct, the captured data is processed in the application.

[GroupPower]

@attila Thank you