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AFE4404EVM: Issue with AFE4404 EVM Data Analysis.

Neethu G Prem10
Prodigy 110 points
Part Number: AFE4404EVM
Other Parts Discussed in Thread: AFE4404

Hi,

We are using AFE4404 EVM and SFH7050 Sensor board. We have few doubts regarding the the Data Analysis file generated after measurement.

What does the Mean(V), Vrms, Vpp, Mean(I), Irms and Ipp mean. ? Are these values corresponds to PDs voltage and current or LEDs ?

Kindly help us to analysis the data. Pls suggest any documents, if any, from which we can find more details regarding the data in the excel files generated after measurement.

.Pls help as ASAP.Looking forward to hear from you.

Thanks in advance

Regards,

Neethu

  • 0
    TI__Genius 12575 points
    Hi Neethu,

    Mean(V), Vrms, Vpp are the voltages corresponding to the differential input current generated by PD.
    Whereas, Mean(I), Irms, Ipp are the currents generated by PD.
    The relation between voltage and current is given by.
    Voltage = Current * 2 * Rf

    Regards,
    Prabin
  • 0 in reply to Prabin Yadav
    Prodigy 110 points

    Hi Prabin,

    Thank you for your reply.

    We are still facing issue in analyzing the data.

    How to analyze the FFT generated in measurement. The FFT generated for LED 1 is attached below. What can we infer from this.

    Also about the data analysis sheet, there are many parameters given, but there is no clue that how are those values calculated.

    Is there any document which help analyzing the result generated.

    Kindly help us.

    Regards,

    Neethu

  • 0 in reply to Neethu G Prem10
    TI__Genius 12575 points
    Hi Neethu,

    FFT helps you see the frequency spectrum of the raw signal. You can check if there are any other signal other than heart rate signal such as 50/60 Hz pick up ( marked by presence of tone at 50/60 Hz). FFT analysis will guide you towards the post processing required for your system.
    You can also see the heart rate signal (a tone) near 1-2 Hz.

    The given parameters given are the standard parameters that can be looked online for calculations.

    Regards,
    Prabin