Stpes for big quadcopter drone ESC calibration 

Before calibrating ESCs, please ensure that your copter has NO PROPS on it and that the autopilot is NOT CONNECTED to your computer via USB and the Lipo battery is disconnected.
1- Plug signal and GND of teh ESC to channel 3 of the RC.
2- Turn on your transmitter Tx and put the throttle stick at maximum.
3- Power Up the ESC
4- You will hear a musical tune then 2 beeps.
5- Lower the throttle stick to full down.
6- You will hear long beep
7- Discount battery.