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We are using EasyDriver stepper motor driver A3967 for running a stepper motor. We wanted to measure the current consumed by the motor using an oscilloscope. Can you give us some suggestions on how can we do that? I read about measuring the voltage across the sense register but I don't know whether it is the correct way? Where can we add a resistor in the circuit to measure current consumed by the motor?

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  • \$\begingroup\$ Do you have the sense resistor installed? \$\endgroup\$ Jul 6, 2017 at 18:16
  • \$\begingroup\$ @Soumil07: Please don't forget to add links to datasheets when asking questions if you want to attract good answers. We like to help but make it easy for us. \$\endgroup\$
    – Transistor
    Jul 6, 2017 at 18:35
  • \$\begingroup\$ google.co.in/… \$\endgroup\$
    – Soumil07
    Jul 7, 2017 at 5:27

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You can measure right across R1 and R2 to get the current in each phase. Since they are 0.75 you must divide the voltage by 0.75.

With resistances this low, a good practice is to put a scope probe on either side of the sense resistor and use the math function (A-B) to subtract the traces.

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