current waveform in oscilloscope

[manishanand14]

Hello Everyone

Please tell me if it possible to see current waveform in an oscilloscope and how.

For example current waveform through an inductor in a DC-DC converter.

 

[FvM]

Yes. Current probes are offered from major oscillsocope manufacturers, you can also use wideband current transformers or shunt resistors. While the latter require to cut the current path, current probes are mostly clamp-on type.

 

[manishanand14]

I don't have a current probe.

Tell me how shall I measure the current waveform using shunt resistor of any known value.

 

[FvM]

So you need to refer to the other options.

Shunt measurement will probably require a fast differential amplifier to pick up the voltage.

Current transformer can be easily made: A small, high µr ferrite torroid of 5 to 10 mm diameter. 10 to 50 turns secondary winding, terminated with a low ohmic resistor or 50 ohm oscilloscope input.