HOW TO Measure Current from the UltiSteppen

[isphording90 0]

Hi there,

I would like to adjust the current given from the UltStepper-boards to the drivers. I know that I have to turn the potentiometer clockwise or counter-clockwise to ether increase or decrease the current.

But I don't know how to measure the new current? I have a multimeter for the measuring but I don't know where to put it.

I have read that the UltiStepper has an extra pin for this purpose but I can't find a description (or a picture) for which pin I have to use...

Thanks in advance

 

[owen 19]

There is only a very small solder pad which is hard to get to. It gives a voltage that is proportional to the current. Last time I looked for it on data sheets for the Pololu board I couldn't find it.

 

[edis 0]

Most easiest way in my opinion is to measure the resistance of the pot, which you are adjusting. So if it's 10kOhm, when you set it at 5kOhm, you set the current to 1A and so on.. Its just a little bit not comforble to adjust and measure with 2 hands

 

[isphording90 0]

Here is a quote from Daid from here: https://groups.google.com/forum/#!topic/ultimaker/UklpZJhpqKs

You'll need a scope that can take samples fast enough, and you need a

current probe.

Or you need a multimeter and just measure the voltage on the "wiper

pin" of the adjuster pot. Which is what is connected to the test pin.

The wiper pin is the single pin on the side of the pot, the other side

has 2 pins. This needs to be about 0.6V

 

Does he mean the "pin" directly touching the "adjuster pod" (potentiometer) facing us on this picture? =)