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Nordic PPK2 - Updated Power Profiler

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pallav.aggarwal@gmail.com:
Contact their customer support on dev zone and they can help you if there is a way to change the range.

There are a few more other power profilers, see here:  https://pallavaggarwal.in/dc-current-analyzer-for-embedded-iot-product-development/

In my opinion, Joulescope is the best and then I like Nordic Power Profiler Kit 2 the next.


justanothername:

--- Quote from: pallav.aggarwal@gmail.com on June 26, 2021, 05:05:02 pm ---In my opinion, Joulescope is the best and then I like Nordic Power Profiler Kit 2 the next.

--- End quote ---

We got a Joulescope in the company as well as an Otii. Joulescope is superior in my opinion. Better resolution, higher voltage range and free API. The Otii has a PSU built in, but for current sinking or battery emulation you must pay a pricey license.
The battery model is crap imho. I sent the guys at Otii an extensive review years ago, but the model hasn't change since. The joulescope support from matt liberty is one of the fastest I encountered, so another point for Joulescope.

Anyway, these devices are expensive, and there is demand for a lot more for each firmware programmer. Since many of the projects are with tiny cells (like coin cells), the lower range from the PPK2 is just not sufficient.

martin2019:
Full disclosure, I am the designer of a product in this space, the P1125.

I recently evaluated the Nordic PPK2 and, like some of the other products mentioned, there are artefacts in the measurement profile when the "auto-ranging" feature thresholds are triggered.  Basically these designs use FETs to switch in different sense resistors.  But the FET gate control signal will inject into the measurement path because of large Cgs of the FET. 

How do you distinguish those artefacts from your target's current profile?
Some of the other products additionally don't have the BW or sampling rate to effectively track the current usage of the target, under sampling, resulting in misleading battery life predictions.

Consider the P1125, www.sistemi.ca/p1125

It doesn't use a "auto-ranging" circuit/algorithm - there is a proprietary circuit that can track 7 decades of current magnitude, 1uA to 3.2 Amps.  The P1125 GUI presents a Log scale for current, allowing one to see the targets full operation.

The holy grail of current measurement (IMO) is the Agilent N6705B.  Its very expensive, >$20k, but it is amazing (although a bit tricky to use).  I have one of these beasts and use it to qualify P1125 and competitve products.

The P1125 is positioned to provide as good performance as the N6705B but at a cheaper price point and ease of operation for the software developer to use at her desk.

Swake:
You write your product is better than the Nordic PPK2. Well it better be, it is 23x more expensive too.
The N6705C, the newer version of the Agilent is 'only' 7,5k€

hary:
Hi

I'm not clear with the PPK2 spec.

It says it can  act as Source meter mode and Ampere meter mode.

In Source meter mode, it can deliver between 0.8 to 5V, supposely thanks from the 5V USB cable the PPK2 is powered from.

In Ampere meter mode, you need to power the DUT by yourself.

So can I give the DUT more than 5V ?  I guess so, but could somebody confirm please.

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