Stepper Driver A4988

[3dkarma]

If you mean measuring the reference voltage or vref, the positive probe should be touched to the round metal circle to the right of the heat sink on the middle-right of your picture. The circle is the trimpot, which you turn to adjust the vref.

[grezmel]

If you mean measuring the reference voltage or vref, the positive probe should be touched to the round metal circle to the right of the heat sink on the middle-right of your picture. The circle is the trimpot, which you turn to adjust the vref.

Thanks - that was what I was looking for - probably didnt explain myself very well - can the negative probe be earthed anywhere metal on the Printer ?

[3dkarma]

Thanks - that was what I was looking for - probably didnt explain myself very well - can the negative probe be earthed anywhere metal on the Printer ?

The negative probe should go on one of the negative power input terminals.