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How to reduce infulence of human touching on sensor cable?

JAy
Prodigy 80 points
Other Parts Discussed in Thread: LDC1614, LDC1614EVM

Nice to meet you.

I am trying to make remote coil with 50cm cable with LDC1614 EVM.

I've aleady read some posts in this foum.

So I found informations :

1st . coxial cable is not recommanded.

2nd. wavelength of sensor frequency is longer then twice of cable length.

3rd. sensor capcitor must be attach to most close position form sensor.

So, I make setting with them. 

But There are still exist too much of infulence with human touching.

If somebody grab or get closer to cable, then data is drooooooop too much. ( It means increasing of inductance)

How to reduce of infulence from human touching?

  • 0
    TI__Genius 14270 points
    Hello,

    Are you using twisted pair for the connection between the LDC1614 and the sensor? What is the sensor frequency and what sensor are you using?

    Regards,

    Chris O
  • 0 in reply to Chris Oberhauser66
    Prodigy 80 points
    Thnks for your reply. :-)
    I'm using twisted pair cable.
    And Sensor Frequency is 2Mhz. ( I saw 1 cycle of sine wave in front of sensor on oscilloscope.)
    2Mhz wavelength is 150m. I think It's enough for 50cm.
    Sensor is just copper coil that I wound on ferrite core. ( Not PCB Coil)
    LDC1614EVM has two coils on board.
    They have same phenomenon. For example, I can see dropping of sensor raw data If I touch on copper line in front of sensor.
    (between LDC1614 and sensor)

    Didn't you have any expiriences like that ? There is no touching noise in your system?
    If you don't have problem, That is very good news for me.
    Thanks.

    Best regards.

    JAy