Current measurements accuracy with Power Profiler Kit 2

RE: Current measurements accuracy with Power Profiler Kit 2

Håkon Alseth — Thu, 04 Apr 2024 08:29:26 GMT

Always happy to help out, Simon. Let me know if you run into any issues or have questions.

Hope you have a wonderful day!

Kind regards,

Håkon

RE: Current measurements accuracy with Power Profiler Kit 2

SimonD — Wed, 03 Apr 2024 16:07:00 GMT

Hi,

Yes it's exact, depending where I break connection I measure multiple component's consumption or only specific one alone.

Thank you for your help,

Best regards,
Simon

RE: Current measurements accuracy with Power Profiler Kit 2

Håkon Alseth — Wed, 03 Apr 2024 12:55:26 GMT

Hi,

[quote user="SimonD"]To be sure that I do things right, could you confirm that if I put the ppk2 on the orange wires (cf joint schema) I will be able to measure the consumption of the different parts of my system. Of course, I let the GND of the ppk2 connected to the GND of the circuit.[/quote]

Yes, that is correct. I assume you want to use it as an ampere-meter, and not a source meter?

In case of ampere meter operation, you can choose to measure both or individually, depending on where you break the connection.

Kind regards,

Håkon

RE: Current measurements accuracy with Power Profiler Kit 2

SimonD — Wed, 03 Apr 2024 10:10:28 GMT

Hi Hâkon,

Tank you for your answers !

To be sure that I do things right, could you confirm that if I put the ppk2 on the orange wires (cf joint schema) I will be able to measure the consumption of the different parts of my system. Of course, I let the GND of the ppk2 connected to the GND of the circuit.

I am working on an embedded project, powered by a battery. And I have 2 parts, one analog and one digital that is composed with a microcontroleur and an IMU.

Thank you in advance for your advices,

Best regards,

Simon

devzone.nordicsemi.com/.../4010.schema.pdf

RE: Current measurements accuracy with Power Profiler Kit 2

Håkon Alseth — Tue, 02 Apr 2024 13:37:10 GMT

Hi Simon,

[quote user="SimonD"]But could you explain to me why it has to be connected in that way instead of the other ?[/quote]

The internal circuitry inside the PPK2 needs a positive bias in order to successfully/accurately measure the current.

Kind regards,

Håkon

RE: Current measurements accuracy with Power Profiler Kit 2

SimonD — Tue, 02 Apr 2024 12:40:07 GMT

Hi,

Thank you for your anwer ! It works well know. But could you explain to me why it has to be connected in that way instead of the other ? I would like to understand well to be sure of what I do in more complex cases....

Best regards,

Simon

RE: Current measurements accuracy with Power Profiler Kit 2

Håkon Alseth — Tue, 02 Apr 2024 12:06:37 GMT

Hi,

[quote user=""]a 440,8kΩ resistance in serie with an ampere meter and the PPKII.[/quote]

The PPK2 is not a true multimeter (ie. cannot measure negative currents, etc).

Try measuring with the PPK2 in series on the positive side, not the negative side of the resistor.

Kind regards,

Håkon