Couple of days ago I wanted to measure how much current a servo motor is drawing during its operation.
I connected a 22 ohm(that is the lowest resistor i could find) resistor in series with a oscilloscope probe. My supply voltage is 4.2V, with 22 ohm resistor voltage dropped to 3.36 when servo was being actuated.
I measured that 3.36 by place the prob on the positive supply of the servo in my circuit.
So I concluded the servo current draw using ohm's law
3.36/22 = 152 mA roughly.
Just want somebody to verify, if my method of evaluating the current is valid and my calculations are making sense.
I connected a 22 ohm(that is the lowest resistor i could find) resistor in series with a oscilloscope probe. My supply voltage is 4.2V, with 22 ohm resistor voltage dropped to 3.36 when servo was being actuated.
I measured that 3.36 by place the prob on the positive supply of the servo in my circuit.
So I concluded the servo current draw using ohm's law
3.36/22 = 152 mA roughly.
Just want somebody to verify, if my method of evaluating the current is valid and my calculations are making sense.