Measuring Current output to Stepper Motor July 08, 2014 11:55PM |
Registered: 9 years ago Posts: 8 |
Re: Measuring Current output to Stepper Motor July 09, 2014 02:24AM |
Admin Registered: 13 years ago Posts: 6,995 |
Re: Measuring Current output to Stepper Motor July 09, 2014 05:42AM |
Registered: 13 years ago Posts: 7,616 |
Quote
rm446
I want to get a measurement of the current being outputted to my feed stepper motor in real time.
Generation 7 Electronics | Teacup Firmware | RepRap DIY |
Re: Measuring Current output to Stepper Motor July 14, 2014 05:09PM |
Registered: 9 years ago Posts: 569 |
Re: Measuring Current output to Stepper Motor July 17, 2014 01:51AM |
Registered: 11 years ago Posts: 791 |
Quote
Kurzaa
On my motor drivers, I am able to read and adjust the voltage to the meters with a multimeter. The black probe (gnd) went to the ground wire on my power supply for convienence and a little balancing act (aligator clips would have been nice). The red probe went to the potentiometer (metal) on the driver board. With the meter set to 2V (?) I was able to read the current voltage with the USB plugged in. I don't think plugging in the 5A power supply was necessarily needed.
The balancing act came in when I was using a screw driver to adjust the potentiometer, with the red probe touching the screw driver rather than the potentiometer directly. This took both hands, so I had to lay / wedge the black probe just right to complete the circuit. Not recommended though as you supposedly can short your motor driver.
Using the VREF that Dust linked, I think you can estimate the current. However to measure it directly, you need to wire the multimeter into the circuit between the motor and the motor driver. I have seen it done in a few YouTube videos, but could never find a diagram for trying it myself.
Re: Measuring Current output to Stepper Motor July 17, 2014 04:15PM |
Registered: 9 years ago Posts: 569 |
Quote
regpye
Get yourself a spare red multimeter probe, they are very cheap.
Make the probe tip into a small screw driver and then when you make the adjustment to the driver board you will also be able to read the voltage, no balancing act needed.
Modify a spare black multimeter lead so that it has a pin end that can be plugged into a GRD socket (spare driver board socket for instance.) and then you have that connection taken care of as well.
Re: Measuring Current output to Stepper Motor August 24, 2017 10:55PM |
Registered: 6 years ago Posts: 13 |