Recent Posts

1

Test Equipment / Re: Choosing between entry-level 12-bit DSOs

« Last post by mawyatt on Today at 11:32:17 pm »

What if someone wanted to go one better than the DHO800/900 or SDS800X? What would be the best choice for the next step up?

The feature set of the 800X-HD is virtually identical to the 1000X-HD. The latter is just much nicer AFAIK. Better ADCs, screen, encoders and build quality. The 50R input path is integrated and it has more USB ports.

It would be nice if you explain what facts this claim of better ADC's is based on.

Since quite often beliefs start to spread as truths and take on a life of their own, it would be good to mention what the claim is based on, unless it, or the information referring to it, appears in a public datasheet.

Hello Rf-loop,
I don't know. I thought the 800X-HD had a lower-end ADC and it was shown on a teardown. I cannot find it, and I might have wrongly inferred it. I was "sure" it was the ADC12D500, and the 1000X-HD had the ADC12D1000, like the 2000X-HD.
In any case, the claim is baseless.
¿Could you confirm the 800X-HD also has two ADC12D1000?
I will edit my post removing the claim in any case.

Mouser has the ADC12D1000 @ $1000 each, as mentioned above how can Siglent sell the SDS800X HD at the price point they offer 

Suspect Siglent has a agreement with all the line up of TI related IC products and gets a really good deal from them, otherwise they'd be heading for Bankruptcy 

Best,

2

Microcontrollers / Re: Memory model for Microcontrollers

« Last post by MK14 on Today at 11:26:50 pm »

Let me give you another example.
The following, fairly recent thread, (different forum), seems to show how the possible 'BOT', changed their original question, into the one that this thread, seems to be about.

I.e. Possible so called 'machine learning'.

Also, as mentioned by someone else in this thread, notice how the 'bot' refused and ignored the comment in my link, to use GOOGLE search.

https://www.electro-tech-online.com/threads/better-use-of-function-pointers.165802/#post-1447881

3

Buy/Sell/Wanted / Re: Canceled Because Thread All Shit Up by "tggzzz"

« Last post by J-R on Today at 11:26:48 pm »

Sad to see a nearly 10 year member drive a new member to such an emotional outburst leading to a ban.

It seems your approach needs an adjustment.  You provided your input at which point the OP made it clear they didn't want you to engage further, yet you essentially relentlessly continued.  You seem more like a bully than a contributor.

4

Projects, Designs, and Technical Stuff / Re: A naive question about automotive CANbus sniffing and spoofing

« Last post by Stray Electron on Today at 11:26:13 pm »

Good idea unless your country plans to ban old cars or already does so.

     FYI: It's already happened in the U.S.  The Cash for Clunkers program was an attempt to get rid of (buy up and destroy)  as many old cars as possible. Also the switch to non-leaded fuel in the mid 1980s meant that many older cars (that required leaded fuel to prevent damage to the exhaust valves) became pretty much unusable.

    But this isn't about getting rid of old cars that might generate more air pollution.  This is the auto makers designing their cars so that they CAN'T be repaired once their limited supply of (grossly overpriced) spare parts modules are sold out.  With the E serial numbers, it will be impossible to reuse modules from a wrecked car so the car owners will be 100% reliant on the auto makers for any replacement parts.  That's very bad news for anyone that wants to keep their car for more than a very limited number of years.  And it will also drive the price of spare parts (and car ownership) through the roof.   

   Ca-Ching$ for the auto dealers and manufacturers.

5

Beginners / Re: Oscilloscope recommendation

« Last post by tatel on Today at 11:10:43 pm »

I did a quick google search about automotive oscilloscope videos. This guy does interesting things: https://www.youtube.com/@MechanicMindset

He's using different devices ranging from a DSO138 to a picoscope 2024A. Unable to find any videos about automotive grade picoscope or micsig oscilloscopes. He doesn't seem to need any special automotive feature.

With a very very high probability, DSO 138 is really the cheapest toyscope in the world. Here's the video:

Recommedation is for picoscope 2024A, I could get it right now for €138 from mamazon . It's a 10-MHz oscilloscope. Here's the video:

Another channel, video about a "Secret $150 portable Automotive Oscilloscope Labscope". That oscilloscope has a "FNIRSI" branding on it. FNIRSI oscilloscopes are nothing to write home about. But, hey, if 10 Mhz are enough and signals are above 0.5 V, then even my zeeweii dso154 will serve me well. I would like to have CAN decoding on it however. The video:

If youtubers are using those devices, it doesn't seem that neither broad bandwidth, huge memory, nor high sensitivity, are essential. Cheap grade oscilloscopes are already useful. Then, an automotive grade oscilloscope, either from picoscope or micsig, will probably look and behave like a jet fighter in comparison. I bet that would be a kind of pro badge, like using a fluke DMM. The guy in the video speaks about a 1000 pounds price for one of these automotive grade picoscopes? I guess you'd be able to find a similar-capabilities micsig in that range. I would contact a seller and ask about it, if no good info is found on the Net.

IIRC, there was a thread about a guy using an automotive micsig, that had problems about a BNC connector getting loose from mechanic action. So you could be looking for models with recessed or somehow protected BNC connectors.

I would be wondering about pro automotive grade or not, and about laptop needed or not.

In your price range I could get from micsig.es either:

SATO2002 for €650+VAT, touchscreen+knobs, 2 channels, 200 MHz, 1 GSa/s, 70 Mpts memory, decodes CAN.

VATO2004, €500+VAT, picoscope-like, can be connected to and android tablet/phone, 4 channels, 200 MHz, 1 Gsa/s, 50 Mpts memory, decodes CAN Edit: that spec seems a little too much? I would say 100 Mhz for  1 Gsa/s and 4 channels?.

Anyway, compared to a 1-2-channels devices boasting 10 MHz, 4Kpts memory, these are jet fighters. I'm sure picoscope will have something similar.

Then I would open a new thread about the candidate, mentioning automotive use.

6

General Technical Chat / Re: When browsing Youtube in private mode, did they get rid of the AutoPlay button?

« Last post by SiliconWizard on Today at 11:08:57 pm »

I've noticed YT tends to re-activate the autoplay on its own if you're not connected to a YT account.
I've encountered this behavior on a tablet using Opera. But the button is still there.
The fact the button doesn't appear may be a Firefox bug, but the fact YT handles the autoplay feature as they please when you're not logged in is nothing new, and in private mode (where cookies are normally not used?), things are usually "worse" regarding YT options. They give you default options as they see fit.

7

Other Equipment & Products / Re: CFW for KSGER/Quicko STM32 Soldering Stations

« Last post by DavidAlfa on Today at 11:06:50 pm »

Please try this:
https://www.eevblog.com/forum/reviews/stm32-oled-digital-soldering-station-for-t12-handle/msg5253981/#msg5253981

8

Test Equipment / Tektronix P5200A "teardown"

« Last post by PwrElectronics on Today at 11:04:05 pm »

I found a P5200A Tek Differential probe in the broken tools bin recently.

Decided to check it out.  Maybe a simple fix or at least some tear-down photos??

This thing was not easy to get into.  Its not designed to be taken apart or serviced.  The membrane switch overlay also hides the screws holding the clam shell together.  So, you will end up cutting the ends of the overlay to get at the screws.  I found this out after more carnage trying to cut the case apart.

Once "IN", here are some pictures of the board, etc.















A video of my troubleshooting of this. 

https://youtu.be/rYr7fdZKJQA

Turns out that someone applied reverse voltage to the power and blew/shorted a clamping diode across the power input.  I was able to get this working again with removing the destroyed diode.  But, the mechanical damage caused by me to get access to this would prevent it from being a viable repair in any corporate lab situation.

9

Projects, Designs, and Technical Stuff / Re: Soldering in a life circuit

« Last post by floobydust on Today at 11:02:51 pm »

The reason a soldering station (tip) is "hard grounded" is for electrical safety. If the power transformer insulation fails, you don't want hazardous live on the secondary side - the tip, handle, controls etc. as a shock hazard.
I've only seen one German brand soldering station with a floating secondary side, it has double-insulation and such low winding capacitance to the primary that the tip stays low potential.

Why would that be more of an issue with a soldering iron than any other appliance with a transformer and no ground connection at all?  Both Pace and Hakko sell 'soft ground' versions that work as I describe and the modification I did seemed to be already anticipated by Hakko---there was already a 1M resistor there and I simply had to switch the tip ground wire over to that.  I can't tell for sure from others teardowns, but it looks like it does have a double-bobbin transformer.  The Pace definitely does as I've taken mine apart.

The common North American safety standard for soldering irons UL499 has legacy, it's from a day when soldering iron heaters were mains-powered, early 1920's. I don't think they were grounded back then and it came later. The standard has many oddball, specific clauses. Some manufacturers exploit this standard's antique, lax requirements. The need for a hard ground has pros and cons either way.

For North America, I think it's the requirement to have the extra insulation (double or reinforced) and to pass the hi-pot test at the higher test voltage- if it's not a "hard grounded" (as I call it) appliance. I would say for global safety certification, the 1MEG is fine as dissipative.

But for soldering...
SMPS-powered soldering stations have high leakage current due to the Y-cap(s) and (some) crappy wound transformer, they float to mains/2 high voltage so a 1MEG doesn't do much. Still ~60VAC at the tip which is no good for working with semiconductors.

Mains transformer-powered soldering stations, old ones were not wound split-bobbin and the high winding capacitance pri-sec means an ungrounded tip floats up to more ACV than you would like. Again, a 1MEG doesn't do much.
Modern split-bobbin transformers have very low interwinding capacitance and are not really an issue, very low stray voltage.

10

General Technical Chat / Re: H5N1 bird flu and how we're risking another global pandemic

« Last post by Bud on Today at 11:00:27 pm »

Dude, you should not miss appointments with your psychiatrist.