Hey,

I got a 60 amp single ESC and wired it to a motor. I plugged it into a servo tester. I followed the instructions for the ESC to do a calibration of the throttle range with the servo tester dial.

When I tried it, the dial made the throttle go higher like it was supposed to, however, at a certain point it stopped going higher when I turned the dial. There was a big dead zone at the end of the dial. And, when I was in that dead zone, the throttle was fluctuating a little bit.

Any idea?

Is this a BLHeli ESC? With newer BLHeli ESC’s we do not need to run calibration.

If you are using a servo tester that controls the ESC via PWM then it maybe the servo tester.

If the throttle was fluctuating in the upper zone it maybe that the ESC is implementing some for of over voltage or temperature control. How are you powering the setup and how are you cooling the setup?