E4 data - EDA electrodes test

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To verify if your EDA sensor is working properly, when requested from our Customer Happiness team, you'll be asked to perform some tests.
Before going through all the steps, please make sure that your E4 is charged and the firmware is up to date (Firmware management with E3/E4 wristband and E4 manager) and you have the latest version of E4 Manager. (Download here).
To test the sensor, please follow the below steps:

  1. Remove the E4 from your wrist.
  2. Turn it on by pressing the button 1-2 seconds.
  3. The LED will flash green for around 30s and then will flash red for a short while. This means the E4 is in “Memory mode” and will start recording parameters from the sensors.
  4. Place your thumb on the electrodes and keep them firmly pressed.
  5. You should see the green and red LEDs at the bottom of the E4 lit up
  6. Try to remain as still as possible for at least 2 minutes, as shown in the image below
    • blobid0.png
  7. Move the band back and forth while pressing the electrodes for at least 2 minutes, as shown in the gif below.
    • Moving_EDA_Test2.gif
  8. When 2 minutes have passed simply turn off the device by pressing the button for 2 to 4 seconds. Please be aware:
    1. if pressed for less than 2 secs, the E4 will place a tag and will flash the red led once.
    2. if pressed for more than 4 seconds, the E4 could enter in “Reset Mode". You will notice because the LED will turn a solid bright white.
  9. With the E4 turned off, connect it to the charger and then to the computer.
  10. Open the E4 Manager, and simply wait for the synchronization of the device.
  11. Click on the “View Sessions” button located on the bottom right-hand side of the E4 Manager interface.
  12. Write down the Session ID of the last session recorded and send it to to the support representative assisting you.

 

Results of the tests - examples

Case 1: Wristband not on the wrist and still, fingers on EDA electrodes (test step 6).

  • Examples of a session showing the expected EDA behaviour when the electrodes are connected: the EDA values never go to zero apart from the beginning and the end of the session when the fingers are removed from the electrodes.

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  • Examples of a session showing the EDA behaviour when there is a possible faulty connection with the electrodes: the EDA drops to 0 even though the fingers are kept on the electrodes.

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Case 2: Wristband not on wrist, fingers on the electrodes, while moving the band (test step 7).

  • Example of a session showing the expected EDA behaviour when the electrodes are functioning properly.

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The accelerometer graph should look similar to the one below if the test has been properly done.

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  • Example of a session showing the EDA behaviour when there is a possibility of faulty wiring with the electrodes.

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Have more questions?