Author Topic: Please suggest a good cheap USB 16CH logic analyser  (Read 1891 times)

0xdeadbeef, rjp, picitup, ace1903 and 5 Guests are viewing this topic.

Online 0xdeadbeef

  • Super Contributor
  • ***
  • Posts: 1318
  • Country: de
Re: Please suggest a good cheap USB 16CH logic analyser
« Reply #25 on: Today at 08:53:50 am »
Yes I've seen both the devices called Jiankun and Kingst, maybe they are a re-seller, but I've even found links from the Kingst site to pictures of a Jiankun device so who knows?
I tend to believe that JianKun is the original name and Kingst a rebranding for the Western market. But indeed, that's up to speculation.

Yes, if you check their download link http://www.qdkingst.com/en/products, you can write your own protocol using their SDK.  I'm not sure about modifying existing protocols, but the SDK has a couple of examples for you to modify AKA Serial and SPI.
Well, an SDK is better than nothing, but personally I'm a big fan of using scripting languages for decoders.

As far as the memory goes, in the above post, I did identify the 2 ram chips which are Samsung K4T1G164QG chips and are 1Gbit each (sorry about the typo before) so that ties up with 2Gbit hardware memory (not 1Gbit like I said before.
Well, I can't say as I only found blurry pictures of the PCB, but actually the Kingst homepage also says 2GBit now (?).

I may be being dumb, but what's a specific clock or trigger input?  The analyser just reads specified data lines and the software has options to trigger on edges/high/low.
Purists would say that a LA without clock input isn't a LA but a protocol analyzer. With a clock input you can adjust the sample rate to that clock and thus guarantee that you store the levels at the correct moment.
I must admit though that I never really used the clock input of the DSLogic myself yet. Still nice to have one.

I took a look at the DSLogic Plus and thought it looked good.  At USD 149.00 I think it's good value (much better that Salea) although the specs of the LA5016 are better.  The DSLogic has a slightly lower max sample rate, at 400Sa/s and this is only with 4 Channels which, rather cheekily, they don't mention on their data sheet.  It's only got 256Mbit memory, so 1/8th of the Kingst.
The sample rate is somewhat meaningless without proper analog bandwidth and these probe cables add quite a bit of inductance at higher frequencies. The DSLogic at least has shielded cables.
About the memory: while I agree that having more can't hurt, I never ran into limitation with the DSLogic Plus. Usually sampling more than 1 or 2 seconds is just not convenient.
Besides, you can always switch to "stream mode" with lower sampling rates and sample up to 16G.

After saying the above, I think the DsLogic Plus would probably meet my needs as mostly my issues are with serial protocols such as RS232 and SPI so 2/3 lines are enough although I'd still go for the Kingst as the specs are better and hopefully more future proof. As mentioned above, I'm not sure about modifying Kingst existing protocols but that would be a good feature.
Nothing is really future proof nowadays. At least the DSLogic is Open Hardware and Open Source. AFAIK even the code for the FPGA is open source. So if everything fails, the community could take over. This being said, in contrast to the OpenBench Logic Sniffer, there doesn't really seem to be a community for the DSLogic and closing down the forum didn't really improve the chances that there will be one.
Trying is the first step towards failure - Homer J. Simpson
 

Online picitup

  • Regular Contributor
  • *
  • Posts: 221
  • Country: gb
Re: Please suggest a good cheap USB 16CH logic analyser
« Reply #26 on: Today at 10:12:12 am »
Quote
Well, an SDK is better than nothing, but personally I'm a big fan of using scripting languages for decoders.

I agree.  I think their SDK uses Microsoft Visual Studio to create DLLs and scripting is much easier and maintainable.

Quote
Well, I can't say as I only found blurry pictures of the PCB, but actually the Kingst homepage also says 2GBit now (?).

Well I've seen 2 x 1Gbit chips on the board, so 2Gbit it is  :)

Quote
The sample rate is somewhat meaningless without proper analog bandwidth and these probe cables add quite a bit of inductance at higher frequencies.

Yes I agree and the cables are long.  I'm making my own up, so will take your recommendation of using screened cables.

Quote
With a clock input you can adjust the sample rate to that clock and thus guarantee that you store the levels at the correct moment.

That's interesting thanks. I've learnt something ;D

Quote
Nothing is really future proof nowadays. At least the DSLogic is Open Hardware and Open Source.

No, nothing is, but you want to get the best chance and better and faster hardware with more memory will help.  Open Source is definitely desirable.  I like PulseView, but the LA5016 is not supported yet.  The LA2016 is planned.

Yes, forums are very helpful and are always my first go-to.  It doesn't look like Kingst has one, which is a pity but as I mentioned, they reply to emails in a day so that's a +1.

Anyway after all this detail, I'm really pleased with my first analyser.  So much easier than a scope LA. I'm so glad I didn't fork out EU 500.00 for the Rigol decoders! I also ordered the LA2016 which is somewhere between here and China so that will go up onto eBay when it arrives.

Onward and upward..

Steve
If you know what you're doing, then you're not learning anything.
 

Online 2N3055

  • Super Contributor
  • ***
  • Posts: 2090
  • Country: hr
Re: Please suggest a good cheap USB 16CH logic analyser
« Reply #27 on: Today at 12:22:07 pm »
I also liked original Scanastudio, and had have bought ScanaQUAD because i liked that software and because ScanaQUAD had triggering.
Then I realized that it doesn't work with old software, and that new software is not written yet. That was 2  years ago, and in meantime, like you said, triggering was reduced to almost none compared to what was promised at the time of purchase, and software is so simplistic that it is sad.

I was active on forum, and some  user interface decision were made based on my input..

I basically gave up on them when Mr. Kamal decided to kill of forum to shut up negative feedback. Instead of developing their basic software to be at least as capable as old one they killed off, they spent two years developing wanky pen scope that nobody cares about....
Talking about going extra mile to ignore users and truth...

And then after 2-3 years, software is still in it's infancy...

I had high hopes for them, but they keep on doing things that are not in benefit of  users.
In order for me to respect  them again they would need  to :
- return multistage triggering
- make U/I that is more informative and uses was screen estate that is there
- write detailed documentation on object model for Scripting
- drop prices.

The way they are now, I wouldn't recommend their products to anyone...
 


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf