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calibration_expert.md

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Calibration - Expert (IMAX B6 and clones only) - optional

If you want to improve voltage measurement accuracy on the first two cells you can try
to calibrate each pin "0-2" separately.
BE AWARE THAT ON SOME CHARGERS THIS CAN BE DANGEROUS!!!

First check if you can safely proceed by using the following test:

  • disconnect everything from the charger including power supply
  • measure resistance between GND and pin "0"
    you can use GND from ISP connector (programmer connector) or any other GND on the charger
  • if the resistance is very low (less than 1k Ohm) STOP THIS PROCEDURE!

If the measured resistance is higher than 1k Ohm you can proceed as follows:

  • connect power supply to the charger and go to "options"->"calibrate"->"expert DANGER!"
  • calibrate pin "0" (Vb0pin):
    • connect a 1.5V battery in series with a resistor (1k Ohm to 10kOhm) between GND and pin "0"
      pin0 battery resistor
    • if the charger shows ~1.5V in "Vb0pin:" then remove the resistor and connect only the battery
      between GND and pin "0"
      pin0 battery
    • with a multimeter measure the voltage between GND and pin "0".
      Adjust "Vb0pin" to this value using the inc/dec buttons
    • disconnect the 1.5V battery
  • repeat the same steps as before for pin "1" (balance port first cell)
    you can use a higher voltage battery ~4.20V
  • repeat the same steps as before for oin "2" (balance port second cell)
    you can use a higher voltage battery ~8.40V
  • you can repeat the same steps for the batteries "-" and "+" terminals

If you do any changes in "options"->"calibrate"->"voltage" you have to repeat this process.