Author Topic: Joulescope JS110: Precision DC Energy Analyzer now on Kickstarter!  (Read 1352 times)

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Offline mliberty

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Hi All!

The Joulescope JS110 Precision DC Energy Analyzer launched today on Kickstarter





Joulescope is the most affordable and easy-to-use tool that enables you to create better, more energy efficient products.  It measures current from 3A (10A bursts) down to nanoamps and voltage up to 15V.  A few features set Joulescope apart:
  • Dynamic range: 10 amps down to nanoamp resolution
  • Low voltage drop: 25 mV @ 1A (20 mV max across shunt resistor up to 2A)
  • Great bandwidth: 250 kHz bandwidth with 2 MSPS
  • Easy to use: Simple multimeter view and more detailed oscilloscope view with waveforms over time
  • Customizable: Host software is open source.  Swappable front panel is also open source!
  • Portable: Light and small - can travel.
  • Affordable: $499 on Kickstarter ($449 early bird) with $799 retail price (USD)
I started a Joulescope topic under Test Equipment to discuss the technical details.


Let me know what you think, and I'm happy to answer questions!
 
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Offline Evi

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Re: Joulescope JS110: Precision DC Energy Analyzer now on Kickstarter!
« Reply #1 on: February 20, 2019, 04:59:20 pm »
$500 - Unreal!
 

Offline mliberty

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Re: Joulescope JS110: Precision DC Energy Analyzer now on Kickstarter!
« Reply #2 on: February 21, 2019, 12:09:57 am »
@Evi - sorry you do not see the value.  Hopefully, Dave will do a proper teardown so you can see that Joulescope is fairly priced.  People developing battery powered products with high dynamic current range (pretty much anything that goes to "sleep" and has RF, displays, LEDs, or motors) either buy products that cost more than 10 times this, or use more manual techniques that use much more time.  I wrote a more detailed blog post on the alternatives here, and you can also check out embedded.fm where we chatted about these issues.


You can think of Joulescope as the Saleae Logic of energy measurement.  It's not the first, the cheapest, or the most accurate, but it's the one that is simultaneously affordable, easy-to-use and accurate enough for board-level voltage, current, power and energy measurements.

Offline rsjsouza

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Re: Joulescope JS110: Precision DC Energy Analyzer now on Kickstarter!
« Reply #3 on: February 23, 2019, 02:53:04 pm »
Quite amazing specifications; I wonder if the large banana plugs may introduce too much noise to nA or 10s of uV to the measurements.

I didn't yet see the video nor read the entire documentation - will do that later.

The price seems alright if the software is well polished and the noise is kept at bay.
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Offline mliberty

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Re: Joulescope JS110: Precision DC Energy Analyzer now on Kickstarter!
« Reply #4 on: February 24, 2019, 12:23:51 am »
@rsjsouza: Thanks!  I have been working to achieve these performance specifications for two years, so it's not easy!

Yes, the banana plugs and individual wires do pick up more noise than BNC + coax, for example.  In the process of developing Joulescope, I started with banana, then went to BNC, then realized I couldn't win.  BNC + coax is limited to about 2 A, and even then introduces a significant voltage drop.  The BNC connectors also have a much higher resistance than banana plugs.  The good news is that many applications don't care as much about bandwidth at very low currents, so the additional noise picked up by banana plugs + wires doesn't matter too much (still keep cables short). 

For situations where noise pickup does matter, you can swap out the front panel!  The front panel hardware design is open source and available on GitHub.  I already have a BNC front panel and USB 2 front panel.  I will be offering these as part of the Kickstarter somehow (hopefully a good stretch goal), and I will work with the backers to see what they want!

The Joulescope User Interface is already easy to use and functional.  I will be adding more capabilities to improve the value.  I have received great feedback from the Joulescope beta users and Kickstarter community.  I maintain a list of future features.  Joulescope backers will help guide development, so join the community!

Online blueskull

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Re: Joulescope JS110: Precision DC Energy Analyzer now on Kickstarter!
« Reply #5 on: February 24, 2019, 02:30:56 am »
Quick suggestion: make it SMALL.

Don't know how complicated your design is, but if it's bigger than a Saleae or an Analog Discovery, for something like this, it feels just wrong.

There are many people (including myself) having not-so-tight budget on tools, but have very tight budget on space.

I feel uncomfortable having things out of my immediate reach, so the stretch of my arms is effectively my maximum working area.

Most of my space is allocated to things that can't shrink -- monitor, KBM, scope, DMM, PSU, iron(s), hot air, parts storage, and most important, WIP.

Having another gadget is cool, but I'd rather have it in a plastic (well shielded internally), small package with smaller connectors (mini bananas or SMA).

Of course, those are all my 2 cents.
 

Offline schmitt trigger

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Re: Joulescope JS110: Precision DC Energy Analyzer now on Kickstarter!
« Reply #6 on: February 24, 2019, 02:39:42 am »
It is isolated, excellent!  :-+

What is the rated isolation voltage?
 

Offline mliberty

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Re: Joulescope JS110: Precision DC Energy Analyzer now on Kickstarter!
« Reply #7 on: February 24, 2019, 02:50:36 am »
Quick suggestion: make it SMALL.
Thanks for the feedback!  Joulescope is pretty small.  150 x 81 x 33 mm and 217 grams.  That's as small as its getting for this version and way better than any competing instruments.  This precision analog and isolation takes up space!

Offline mliberty

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Re: Joulescope JS110: Precision DC Energy Analyzer now on Kickstarter!
« Reply #8 on: February 24, 2019, 02:54:58 am »
What is the rated isolation voltage?
The rated isolation voltage is ±48V.  I think that covers a majority of the use cases and means that I don't have to deal with much more stringent CE/UL testing.  However, the actual components are rated much, much higher.  The aluminum case also prevents higher isolation voltages.  Do you have a specific isolation voltage requirement in mind for your application?

Online blueskull

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Re: Joulescope JS110: Precision DC Energy Analyzer now on Kickstarter!
« Reply #9 on: February 24, 2019, 03:01:53 am »
The rated isolation voltage is ±48V.

Just out of curiosity, did you use those TI DCP power modules? I can't think of how did you get the 48V limitation from other than that.
 

Offline mikeselectricstuff

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Re: Joulescope JS110: Precision DC Energy Analyzer now on Kickstarter!
« Reply #10 on: February 24, 2019, 03:14:07 am »
Also discussed here, with some tech info : https://www.embedded.fm/episodes/278
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Offline schmitt trigger

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Re: Joulescope JS110: Precision DC Energy Analyzer now on Kickstarter!
« Reply #11 on: February 24, 2019, 03:23:30 am »
No immediate need, I was only wondering, perhaps you should post it on the specs.

Thanks for your reply.
 

Offline mliberty

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Re: Joulescope JS110: Precision DC Energy Analyzer now on Kickstarter!
« Reply #12 on: February 24, 2019, 04:47:19 am »
Just out of curiosity, did you use those TI DCP power modules? I can't think of how did you get the 48V limitation from other than that.
The ±48V rating is self-imposed.  It qualifies Joulescope as a very low voltage device so that it should get through CE certification easily, and UL is not necessary.  The actual components are:
Part #MfgrDescriptionIsolation:workingIsolation:60sIsolation:1s
760390014WurthTransformer400 VRMS2500 VAC3125 VAC
Si8661BB-B-IS1Silicon LabsDigital isolator445 VRMS4500 VRMS
TLP2361(TPL,EToshibaOpto isolator500 VRMS3750 VRMS

The Joulescope PCB maintains a 4 mm clearance between the isolated sensor side and USB side.  The real limitation for isolation clearance is the aluminum enclosure.  If I end up with enough customers that want to use Joulescope with higher isolation ratings, I can design a suitable enclosure and get the safety certifications.  The ±48V rating is already in the user's guide, but these details are not.  I will add them!  Thanks!
 
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Offline hwj-d

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Re: Joulescope JS110: Precision DC Energy Analyzer now on Kickstarter!
« Reply #13 on: February 24, 2019, 07:50:44 am »
Also discussed here, with some tech info : https://www.embedded.fm/episodes/278
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Online NiHaoMike

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Re: Joulescope JS110: Precision DC Energy Analyzer now on Kickstarter!
« Reply #14 on: February 26, 2019, 10:42:36 am »

So it's basically a Mooshimeter with more resolution and more bandwidth. (And a higher price.)
Cryptocurrency has taught me to love math and at the same time be baffled by it.

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Offline mliberty

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Re: Joulescope JS110: Precision DC Energy Analyzer now on Kickstarter!
« Reply #15 on: February 26, 2019, 11:37:55 am »
Thanks for posting the VoltLog Joulescope teardown & review.  Hopefully, Dave gets around to one sometime!

Joulescope has much higher bandwidth, much better resolution, much better accuracy, much higher input impedance, with software that makes it simple to measure and optimize energy consumption.  Joulescope also transfers all 2 MSPS, not just periodic summaries, which really matters for measuring short events like interrupt service routines, inrush current, and firmware changes that affect the duration of power states.

Joulescope takes care of measuring correctly so that you can focus on your work that matters.  You can think of Joulescope as the Saleae Logic of energy measurement.  It's not the first, the cheapest, or the most accurate, but it's the one that is simultaneously affordable, easy-to-use and accurate enough for board-level voltage, current, power, and energy measurements.  Joulescope is also way more affordable than anything with comparable specs.  You can download the Joulescope User's Guide which contains the specifications.

Offline mliberty

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Re: Joulescope JS110: Precision DC Energy Analyzer now on Kickstarter!
« Reply #16 on: February 28, 2019, 01:08:07 am »
100% funded with 21 days remaining!    :-+ :clap: :-+

Offline EEVblog

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Re: Joulescope JS110: Precision DC Energy Analyzer now on Kickstarter!
« Reply #17 on: February 28, 2019, 10:58:33 pm »
@Evi - sorry you do not see the value.  Hopefully, Dave will do a proper teardown so you can see that Joulescope is fairly priced.

I have the unit sitting on my Mailbag shelf.
BTW I'm actually working on very similar design (new and vastly improved uCurrent).
 

Offline mliberty

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Re: Joulescope JS110: Precision DC Energy Analyzer now on Kickstarter!
« Reply #18 on: March 01, 2019, 12:01:03 am »
I have the unit sitting on my Mailbag shelf.
BTW I'm actually working on very similar design (new and vastly improved uCurrent).

Hi Dave!

Great to hear that a Joulescope is on the shelf ready for your mailbag segment!

Sorry to hear that Joulescope might be competing with your new project. :-/  You've done a great job teaching about burden voltage and dynamic current range.  I am sure you will give the Joulescope a fair look either way.  The existing products in $250 to $1000 USD price range for energy measurement are lacking, and there's room for a few good products.
 
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