Voltage measure difference

ArduCopter Copter 4.0
1

Hi

I have realize that I always get differente voltaje measure from differents devices

As you can see in the next picture, no voltage is the same. The one on the FC is 22.13, using the power module it came with the black cube. (power brick)

Wich one is the right one? what do you think?

image
image1151Ă—353 176 KB

2

measure voltage with a true RMS multimeter then calibrate your sensors with it

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3

Yes, in order of instrument quality.

  1. DVM unless it’s one of the free ones they give a way at Harbor Freight with any purchase :grinning:
  2. Cheap voltage modules
  3. Cheapest voltage modules.
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4

Use a discharged battery or adjustable power supply and calibrate the Flight Controllers voltage sensor at a low voltage, using you digital multimeter as the reference. It will be closer than the cheap battery monitors.
Most standard “power bricks” that come with the flight controllers are a little non-linear, so best to have the voltage being accurate around the level where you’d expect a battery failsafe.
Set the sensor type to “Other” and follow the instructions to set the voltage shown on your DMM.
https://ardupilot.org/copter/docs/common-powermodule-landingpage.html

1 Like
5

thanks!

can yuo remcomend me one?

6

Multimeters can run from free (Harbor Freight gives them away with a purchase) to a lot of money for a branded meter like a Fluke. I have several from cheap to expensive. A $25 one from the same Harbor Freight I picked up while in the field has been working as well as my $150 Fluke for Hobby purposes. But what’s available would depend on where you are I imagine.

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