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#2725 Reply
Posted by
EU1
on 23 Feb, 2017 22:22
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#2726 Reply
Posted by
Throatsleep
on 10 Feb, 2018 01:52
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I hope someone can help. I cannot get an image to a USB stick. it creates the file, but the file is blank and has no saved image. Is there something I am missing?
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#2727 Reply
Posted by
TomC
on 05 Apr, 2018 05:10
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I hope someone can help. I cannot get an image to a USB stick. it creates the file, but the file is blank and has no saved image. Is there something I am missing?
It could be that the USB drive is not formatted to FAT32 with allocation size of 4K or less.
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#2728 Reply
Posted by
ckocagil
on 09 Apr, 2018 16:08
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Does anyone know where to find the latest firmware for the E-series model of this scope, "SDS7102E"? All the firmware I find on various OWON websites specifically say that they're for the non-E models. My Google-fu is failing me.
I also wonder if it's possible to hack the firmware to enable the deep memory option. My version officially has up to 100K memory, but the memory chip attached to the FPGA is exactly the same chip as the regular version.
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#2729 Reply
Posted by
Daruosha
on 09 Apr, 2018 19:09
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No public firmware has been released for the -E version. You're stock with the factory installed version. I had one of those 7102-E models and it just crapped itself after a month of use. No support, no firmware update (or even the same firmware which was installed on the scope). Had to sell it to the same shop i bought the scope from at the 1/3 of the price. Yeah....
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#2730 Reply
Posted by
masterx81
on 01 Feb, 2020 20:33
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Hi! Someone know what smps in the scope run at 60khz? I've got some spikes in the mv region and i want to try to find the source. Thanks!
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Hi! Someone know what smps in the scope run at 60khz? I've got some spikes in the mv region and i want to try to find the source. Thanks!
Are you sure these spikes are from the internal source? Please put a picture
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#2732 Reply
Posted by
masterx81
on 02 Feb, 2020 10:25
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Quite sure, i have shut down every smps/flurescent/led lamp around here. Attach the photo of the usual test of the probe to the gnd test point.
Time ago wasn't present this ~50mvpp spike, only the ~20mv background noise.
Suspect some electrolytic capacitor that's going.
I've found on this thread that the -7.9v smps works at nearly 60khz, i think that can be the source.
I have already to dismantle the unit for the nasty rotary knobs... time to do some work...
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#2733 Reply
Posted by
digsys
on 02 Feb, 2020 11:30
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I had the same issue ages ago. In the end I just ripped out the S/Mode, made up my own, and even added a Li pack. Got rid of the 240V IP and made it universal DC
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#2734 Reply
Posted by
masterx81
on 02 Feb, 2020 12:21
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Wow a lot of work
Did you have some photos or schematics?
You have done it linear?
Thanks!
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#2735 Reply
Posted by
digsys
on 02 Feb, 2020 12:38
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Na, it's a pretty simple circuit board to replace and as I needed it for mainly heavy vehicle electronics - 12-48VDC, it was a perfect solution.
I'd have to dig up old PCB circuits I made (could be a few days), but I used very low noise DC-DC converter, complete modules, so I knew the noise figures were the best I could get (Vicor I think, but I can check).
I had that same noise you posted, and for the very high sensitivity signal tracing (underground sensors), it was a disaster. All quite forward.
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#2736 Reply
Posted by
masterx81
on 02 Feb, 2020 13:57
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thanks for the suggestion! I'll check those vicor modules.
The modules worked from 230v to the voltages needed for the scope, or you lowered them with a conventional transformer+diodes?
This scope had been always a bit noisy (i received it with 200mv pp spikes, after a first dismantling and a good clean lowered them to 20mvpp), and as if i need to dismatle it, it'w worth to made it a bit better.
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#2737 Reply
Posted by
masterx81
on 02 Feb, 2020 21:10
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I checked vicor modules and... wow how much they costs
For the same ammount i can buy a new scope
In any case i try to follow you suggestion and find suitable low emi modules (a bit cheaper
)
Mean well encapsulated units seem interesting
I need to open the scope and check how much space there is inside..
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Where did you connect the probe? it seems to me this noise gets absorbed by the probe's ground lead, but if you see this noise without a connected probe, that's different
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#2739 Reply
Posted by
masterx81
on 03 Feb, 2020 00:10
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Noise measured on the gnd of the probe calibration point (as common on this device. Internally the scope generates a lot of emi.
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#2740 Reply
Posted by
digsys
on 03 Feb, 2020 11:05
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I checked vicor modules and... wow how much they costs
For the same ammount i can buy a new scope
In any case i try to follow you suggestion and find suitable low emi modules (a bit cheaper )
Mean well encapsulated units seem interesting
I need to open the scope and check how much space there is inside..
LOL. You don't need to use that specific brand / type. It was just one I use, of of many. New converters these days are pretty damn
quiet (noise wise), and getting extremely efficient (if needed). My current favourite is T31SN24005, but there are so many others, for whatever price range you want.
If you need them even quieter, then just add LC filters / common mode filters / magnetics etc and you can even go linear. It worked perfectly for me, as I was in the same situation.
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#2741 Reply
Posted by
masterx81
on 03 Feb, 2020 11:40
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Seem that i can't find that module over here in italy, i'll search something similar. You have replaced only the main psu or also some smps modules on the adapter board?
Thanks!
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Seem that i can't find that module over here in italy, i'll search something similar. You have replaced only the main psu or also some smps modules on the adapter board?
Thanks!
What is your oscilloscope full model?
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#2743 Reply
Posted by
masterx81
on 03 Feb, 2020 16:42
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Mine is a 13xx s/n. It's already the "low noise version". But the 60khz noise developed recently. Before was only around 20mv, now 50/60.
Need to to choose from full linear (i not think to have enough space for diassipator), linear then smps (if i can fit a good toroid inside), or full smps (with low noise modules)
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Mine is a 13xx s/n. It's already the "low noise version". But the 60khz noise developed recently. Before was only around 20mv, now 50/60.
Need to to choose from full linear (i not think to have enough space for diassipator), linear then smps (if i can fit a good toroid inside), or full smps (with low noise modules)
Please put some images from the power supply unit. it might be some bulgy electrolytic caps there. if it was not noisy from the beginning, then it might be damaged. be sure to remove the on/off switch cap first and press it down before opening the case. once I broke the switch handle while I was opening the case, then I had to replace it.
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#2745 Reply
Posted by
digsys
on 03 Feb, 2020 22:53
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Seem that i can't find that module over here in italy, i'll search something similar. You have replaced only the main psu or also some smps modules on the adapter board?
Thanks!
It is also second sourced as I3A4W005A-150V, but it is just a suggestion. What I was trying to say though is -
As the DSO is a portable, I did NOT want any 120-240V IEC / mains in it AT ALL, so ripped all that out. I made a replacement plate with DC sockets and pluggable sockets, and now can power it / charge up the batteries from ANY 12V - 19V common power pack (ie from any PC), and in my case from ANY vehicle 12-48VDC (and now also PoE supplies). It is completely isolated from all mains.
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#2746 Reply
Posted by
masterx81
on 04 Feb, 2020 00:30
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Thanks digsys, perfectly understood. Based on how much space i have inside i take my decisions.
hesam.moshiri, for sure it's an electrolytic cap that it's going, maybe replacing it i can remove the 50mv spike, but as i already take it apart, i'll try to made it a bit better.
Thanks!
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#2747 Reply
Posted by
masterx81
on 09 Apr, 2020 00:28
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Someone can explain me how is possible that my device today had not ANY noise and was able to trigger well also a 20mv signal, while few weeks ago the background noise was more than 100mv?
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#2748 Reply
Posted by
tautech
on 09 Apr, 2020 02:08
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Someone can explain me how is possible that my device today had not ANY noise and was able to trigger well also a 20mv signal, while few weeks ago the background noise was more than 100mv?
Nearby SMPS ON ?
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#2749 Reply
Posted by
digsys
on 09 Apr, 2020 03:07
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Well, here's where you'll have to do some CSI detective work :-)
Was it plugged in and ON / charging / OFF ?
Was the battery full / mid / low ?
Was the device under test generating noise and being picked up from the test leads ?
What other S/S devices were on in the near vicinity ? Phase ? Have you gone from heating / cooling ? - usually a high draw.
There's NO reason to suspect, at this point, that the 2 instances of noise are related. Up to you to prove either way.
Good luck Columbo :-)