electrical testing

equilibriumequilibrium
edited April 2019 in Cyton
Hi folks,

in germany (and probably most countries in the world) we need to do recurrent testings of our electrical equipment. For these testings the measuring device applies high voltage/ ampere powers to the electrical equipment. Now I wonder if somebody knows, what powers ganglion/ cyton boards can bear or what would be the recommended testing routines for euqipment like these boards?
(our use case would be a 24v power supply for a system on a chip mainboard, some actuators and the cyton board connected via serial port)

Anybody into that subject?

thanks and best regards,
Ben
Ben

Comments

  • wjcroftwjcroft Mount Shasta, CA
    Ben, hi.

    You mention "cyton board connected via serial port". So you've ruled out battery power and using the supplied Bluetooth dongle and connection? That has the highest possible isolation, and (although not CE or IEC 60601 rated), would give excellent isolation from mains voltages. If your SOC mainboard allows a usb dongle connection, this is easy.


    If you use a serial port, that is usually done with a usb to serial converter. Thus the wire connecting between the laptop and OpenBCI board, is a usb cable. The usb to serial adapter chip (breakout board), is attached to the OpenBCI mainboard. And small wires run from breakout to Cyton pins. There are various usb isolators available that meet 60601 requirements.


    Note most of these only protect the data lines to 5kV. For full 60601 you also need to protect the usb power lines at that level as well. 

    Again, all of this is avoided with battery power and radio link.

    Regards,

    William



  • equilibriumequilibrium
    Dear William,

    thanks for the quick and precise answer, we'll think about your suggestions.
    Yes we ruled out the radio connection/ battery supply for various reasons, e.g. we will have everything built in a box so it won't be possible to change batteries.

    thanks sofar,
    I'll update here as soon as we found a way,
    best,
    Ben
  • wjcroftwjcroft Mount Shasta, CA
    re: "won't be possible to change batteries"

    It's not necessary to change batteries to charge them. The PowerBoost can handle your charging by plugging your box into a USB port. It does help to have the charge status light on the PowerBoost visible through a hole or window on your box.

    Regards,
  • equilibriumequilibrium
    oh, thats an interesting point...
    and brings us to another question: Do you think 2m of cables from the headbands to the cyton board are problematic? As we would like to connect more than one person the cyton board simultanously.. We thought of using shielded RJ45 Lan cables (with a plug shortly before the cyton board)
    So maybe we stay with the bluetooth connected board.

    best,
    ben


  • wjcroftwjcroft Mount Shasta, CA
    Ben, I would still recommend staying with the bluetooth connection.

    Long cable runs and EEG do not mix well together. Frequently long cables pick up EMF / EMI noise from the environment and bring it to the termination end points. Even cable motion (from head movement) will induce EEG artifacts.
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