Power Profiler Kit gives wrong current measurments

RE: Power Profiler Kit gives wrong current measurments

ArvidB — Thu, 07 Apr 2022 10:00:29 GMT

Hello, I accidently did the same thing to my power profiler kit 2, for me it is measurements in the around uA that is not detected at all. Currents around 100mA seems right. So probably I also have a burned resisttor but I cant see anything on the board. Do any have a suggestion on where to look extra closely?

RE: Power Profiler Kit gives wrong current measurments

5IM00N — Fri, 24 May 2019 08:57:04 GMT

I just checked the measurement ranges by connecting different resistors to it.

0...70uA ✅, I got right values

70uA...1mA ✅ I got right values

1..70mA ❌, I got wrong values.

I measured R4 which seems to be the shunt resistor for 1...70mA range. I measured about 60Ohms. This explains the high measurements I got.

I checked the resistor under a microscope. There I see a small little nearly to visible dark spot on the resistor. The others are okay.

Currently I dont have a new 1R8 resistor here. So I can not check it now.

I am going to update this post as soon as I replaced the resistor and checked my values.

Update

Changing R4 (1,8Ohm) fixed the issue.

@Jared, thanks for your support!

Best regards

RE: Power Profiler Kit gives wrong current measurments

Jared — Wed, 22 May 2019 12:09:19 GMT

Hi,

Unfortunately, this is indeed very likely that it would hurt the device.

regards

Jared

RE: Power Profiler Kit gives wrong current measurments

5IM00N — Tue, 21 May 2019 11:49:52 GMT

Hi Jared,

[quote userid="73165" url="~/f/nordic-q-a/47560/power-profiler-kit-gives-wrong-current-measurments/188205"] Could you describe a bit more in detail how this happened?[/quote]

One time I connected my DUT in reverse polarity. Maybe this caused to much current and destroyed some device on the PPK.
Is this possible? Or is there an overload protection?

5IM00N

RE: Power Profiler Kit gives wrong current measurments

Jared — Tue, 21 May 2019 11:24:58 GMT

Hi,

Indeed, if you're measuring values that you can confirm is not right by using a mulitimeter then it's probably broken.

[quote user=""]Does the PPK get damaged after accidentally short circuit the PPK?[/quote]

Could you describe a bit more in detail how this happened?

Jared