hybridfree/eevblog-posts huggingface dataset:
Help needed to identify HP card - Page 1
Forum section: electronics / testgear

author: dreamth
author_rank: Newbie
timestamp: August 05, 2025, 10:50:31 pm
content: Please help me identify which HP equipment is this card from.It contains two LDR and two diodes inside polystyrene foam under the metalic hood which makes me think it should be some kind of oscillator.I have two identical ones and every card in the equipment came in two pieces, like for two completely separate channels.https://imgur.com/a/NlhYm3khttps://postimg.cc/8fW5G6XBhttps://i.postimg.cc/NFCr181V/IMG-20250806-011047.jpg

author: gslick
author_rank: Frequent Contributor
timestamp: August 06, 2025, 02:57:28 am
content: From the 07130-61300 part number on the PCB, and if it likely came from a dual channel instrument, maybe it came from an HP 7130A two-pen strip chart recorder. Those date from around the late 1970s.

author: dreamth
author_rank: Newbie
timestamp: August 06, 2025, 05:20:40 am
content: Thank you very much! I found the service manual!https://imgur.com/a/Xemd377
ToolTop ET829 Multimeter/Oscilloscope/Waveform Generator + PC software - Page 1
Forum section: electronics / testgear

author: eaoubi
author_rank: Newbie
timestamp: August 05, 2025, 06:11:26 am
content: I purchased a ToolTop ET829 Multimeter/Oscilloscope/Waveform Generator from the ToolTop direct store on AliExpress.It's an inexpensive device with quite acceptable performance for quick repairs and evaluations.The oscilloscope has two channels. The bandwidth is 80 MHz (250 Mbps) using a single channel and 50 MHz in dual mode.Although the device has the ToolTop logo, neither the box nor the manual have any manufacturer identification or contact information.It is advertised as "USB LINK SMART DEVICE" and is shown as linked to data viewing, capture, and analysis software. When connected, it is detected as a virtual serial port COM3. The user manual only mentions the port as a battery charging connection. There is no mention of the software.After complaining through messages to the store, they sent me a link to download ScopeMeter2023022v1.0 for Windows 10 or 11. What is provided is a zipped version of the already installed software (although there are subfolders in several languages, it is installed in English and there is no way to modify it).This application works acceptably in multimeter mode but crashes and closes when the instrument is switched to multimeter mode. I received no further response when I contacted the store about this issue. It is impossible to find a ToolTop website or any other means of contacting support.Has anyone had a similar experience? Have you been able to get the software working completely? Have you been able to contact them for assistance? I would appreciate any useful information. Thank you!
Fluke 8845A Second-Hand Worth It? - Page 1
Forum section: electronics / testgear

author: TylerPeppy
author_rank: Newbie
timestamp: August 05, 2025, 11:46:17 pm
content: Wondering if anyone can reccomend the Fluke 8845A; will be used for some long-term datalogging and is available for about 650$ CAD up here off eBay. I'd not like anything more expensive than that, having considered some offerings from HP and Keithley.

author: bdunham7
author_rank: Super Contributor
timestamp: August 06, 2025, 12:06:06 am
content: If it is fully functional and in good physical shape, that's a pretty good deal. Those are very nice meters but not ones that can be easily repaired or restored from junk condition.
U1272A - Autohold Trigger - Page 1
Forum section: electronics / testgear

author: 2X
author_rank: Frequent Contributor
timestamp: August 05, 2025, 03:42:47 pm
content: I have a query about what means the "threshold count & 500 counts". For instance if am in autohold function and touch the leads on a source of 1V it will autohold in memory the 1V measurement, but what is the meaning of 500 count?
New Owon's 12-bit scopes... - Page 1
Forum section: electronics / testgear

author: Adrian_Taylor333
author_rank: Regular Contributor
timestamp: August 05, 2025, 05:02:37 am
content: Owon has new 12-bit series that are supposed to one-up Rigol's with higher sampling rate (2Gs/S vs 1.25Gs/s) and be lower priced than Siglent's series, while also offering logic probe and AWG option:* (https://www.owontech.com/digital-oscilloscopes/benchtop-oscilloscopes/ads900a-series-12bits-multifunction-digital.html)There is also a ADS3000 series, but that one seems more vague ATM, as there is no pricing for it:* (https://www.owontech.com/digital-oscilloscopes/benchtop-oscilloscopes/ads3000a-series-12-bits-multifunction-digital.html)Has anyone more data to share about them ?Maybe someone has them on desk, testing them for a review ?🙄Is 3000A basically the same 900A stuff, just with better analog front-end and deeper memory ?

author: Doctorandus_P
author_rank: Super Contributor
timestamp: August 05, 2025, 05:09:07 am
content: They are also being sold disguised as: VOLTCRAFT DOV702 and DOV2504F LAhttps://www.conrad.nl/nl/p/voltcraft-dov702-digitale-oscilloscoop-70-mhz-2-kanaals-1-25-gsa-s-50-mpts-12-bit-digitaal-geheugen-dso-1-stuk-s-3350781.htmlhttps://www.conrad.nl/nl/p/voltcraft-dov2504f-la-digitale-oscilloscoop-250-mhz-4-kanaals-1-25-gsa-s-100-mpts-12-bit-digitaal-geheugen-dso-functi-3350792.html

author: Adrian_Taylor333
author_rank: Regular Contributor
timestamp: August 05, 2025, 01:54:29 pm
content: New Owons have 2Gs/s, not 1.25Gs/s.
Inside a Fluke 107 - Page 1
Forum section: electronics / testgear

author: BillyO
author_rank: Super Contributor
timestamp: August 06, 2025, 02:09:32 am
content: This piece of glass (first picture) is glued to the PCB right below the little round hole in the battery compartment (2nd Picture).Is this there in an attempt to mitigate damage caused by battery leakage? Or is there another reason for this?It seems to me that it would be just as easy, if not easier, to seal the battery compartment.(Sorry about the focus)

author: floobydust
author_rank: Super Contributor
timestamp: August 06, 2025, 06:02:54 pm
content: I think it's mechanical - the PC board has no support on that side from the back cover. Just bad mech designUsually a drop-test will show these weaknesses.So they put plastic tape (I can't see that being glass) as a spacer. Found this better pic.

author: BillyO
author_rank: Super Contributor
timestamp: August 06, 2025, 06:20:49 pm
content: It is very hard but does scratch a little. Acrylic maybe?There does seem to be an edge support just adjacent to it. Maybe it just raises the board enough to contact the boss around that hole? They could have just made the boss a little deeper.

author: floobydust
author_rank: Super Contributor
timestamp: August 06, 2025, 08:05:25 pm
content: I think supporting at the edge does not work when there are pushbuttons, and I think the LCD might break if force is applied there.It's the usual mech/elec design mixup: the back cover leaves room for components that might be on the PC board, the battery holder is up but they could not put posts or pegs in the middle area.

author: BillyO
author_rank: Super Contributor
timestamp: August 06, 2025, 09:06:53 pm
content: You're probably right.
HP 4191A RF Impedance Analyzer NiCd Replacement - Page 1
Forum section: electronics / testgear

author: NF6X
author_rank: Unknown
timestamp: August 04, 2025, 01:45:28 am
content: I just got this HP 4191A RF Impedance Analyzer from a local seller on eBay. Then I paid more for the 16092A spring terminal fixture than for the instrument, and more again for a 16342A service/calibration kit than the instrument.It does work, but the NiCd cells which maintain calibration memory are not healthy.Surprisingly, those leaky cells still hold enough charge to maintain calibration for a while.The calibration kit's foam padding had thoroughly decomposed into nasty sticky dust. I had to dig the components out of that pile of crud in the corner.Everything cleaned up ok. I made 3D printed caps for the APC-7 connectors, and eventually I'll make some sort of replacement dividers or trays for the case.What guidance do the experts here have about replacing the old NiCd cells now that they're generally unavailable? I gather that simply slapping in NiMH cells may cause problems since the charging circuit is intended for NiCd chemistry.

author: mawyatt
author_rank: Super Contributor
timestamp: August 04, 2025, 02:22:33 am
content: Beautiful instrument and stuffMaybe try and trace out the charging circuit to see if it can handle NiMH.Best

author: squadchannel
author_rank: Frequent Contributor
timestamp: August 04, 2025, 02:31:14 am
content: may be able to replace it with an eneloop. or FRAM?

author: coppercone2
author_rank: Super Contributor
timestamp: August 04, 2025, 02:34:45 am
content: I bought solder in replacement cells for a premium for minehttps://www.digikey.com/en/products/detail/dantona-industries/N-700AACT-JP/19181903I may have drilled a small hole in the lead and spliced in a bus wire to make it 'through hole' if that is the caseI also had to replace some kind of RAM on mine ( 2 chips )I can tell you for sure, what makes batteries break is improper operation. There is benefits for all families but you wanna run them correctly. Unless you study the charge circuit I recommend buying a NICAD cell for a important system like that.

author: NF6X
author_rank: Unknown
timestamp: August 04, 2025, 04:20:30 am
content: Replacing the SRAM with FRAM sounds like a neat idea. I don't plan to do it, but I think it's neat and I wonder if anybody else has tried it.The charging circuit is just a 150 ohm resistor. There is no end-of-charge cutoff. Here's a marked up snip from the service manual:U1 is a voltage detector which turns on Q1 when 5V is present, and (I think) suppresses memory writes when 5V drops.

author: NF6X
author_rank: Unknown
timestamp: August 04, 2025, 02:52:16 pm
content: I found this thread about indefinite NiMH trickle charging:https://electronics.stackexchange.com/questions/650063/can-i-indefinitely-trickle-charge-nimh-batteries-with-a-constant-currentThese cells look like they would get trickle charged at around 0.01C in an otherwise unmodified 4191A. Maybe that would be ok?https://www.digikey.com/en/products/detail/fdk-america-inc/HR-AAUT/1203030
CMU-200 R&S  - RF-4IN -damage - Page 1
Forum section: electronics / testgear

author: SP4GJ
author_rank: Newbie
timestamp: August 05, 2025, 04:53:09 pm
content: Hello.I have a CMU 200 with a damaged RF4IN port.There's an attenuator on the input. Does anyone know what the values should be? I haven't found this information anywhere in the posts.Thanks in advance.Greg

author: DaneLaw
author_rank: Frequent Contributor
timestamp: August 05, 2025, 10:10:56 pm
content: https://www.eevblog.com/forum/repair/

author: SP4GJ
author_rank: Newbie
timestamp: August 06, 2025, 06:52:15 am
content: Unfortunately, as I wrote earlier, I did not find this information there.

author: squadchannel
author_rank: Frequent Contributor
timestamp: August 06, 2025, 07:15:43 am
content: "cmu200 front end" 5min googling.https://groups.io/g/Rohde-and-Schwarz/topic/cmu200/77320960https://groups.io/g/Rohde-and-Schwarz/topic/86579765#msg349717.5db pi attenuator?
Jesverty SPS 6005N Query - Page 1
Forum section: electronics / testgear

author: Toltec
author_rank: Newbie
timestamp: August 05, 2025, 12:24:10 pm
content: Hi All,I've just taken delivery of two SPS 60005N PSUs. I'm very impressed with them given the low cost. I bought two with the intention of connecting them in series to create a split rail supply (as per the many examples on the web). I didn't check if this was possible with Jesverty before buying them (my bad). It turns out this isn't possible. Jeverty say it requires non-DIY mods. I couldn't resist testing them in series at a low voltage: The PSU with the lower voltage appears to act like a current sink (voltage goes to zero and amperage is the same as the dominant PSU).My question: Is this behaviour familiar to anyone and a relatively easy fix available? I don't mind opening them up and doing some soldering, but my experience is limited. I had hoped that a few external diodes would do the trick.Thank youToltec
Metrix MX 55 Multimeter fault: Diode test no longer works - Page 1
Forum section: electronics / testgear

author: Ismail47
author_rank: Newbie
timestamp: August 03, 2025, 04:09:22 pm
content: I own a Metrix MX 55 multimeter, and all its functions are OK except for the diode test.Does anyone have a olution for this problem?"
Retrofitting Fluke 867b display with the backlight to the 863?! - Page 1
Forum section: electronics / testgear

author: Neshco
author_rank: Contributor
timestamp: August 03, 2025, 08:50:40 pm
content: Just got one Fluke 863 and it appear it is in good working condition, all fine and beautiful except display which is awful for reading because of leak of the back light.I google it and found that 867b and 863 display are interchangable and share same display: LMG7135PNFL, 97-44279-7Not sure if this is correct, found it on ebay where one seller listed this display with this OEM number for 863, 865, 867 and 867b. Guess it is backlight version and it match pin to pin to 863 as well, but without back light power obviously.Is there someone that did this retrofit or at least know if 867b display fit in 863 DMM?
now USB-C lock on DHO800 (EU/NL) - Page 1
Forum section: electronics / testgear

author: Rolo
author_rank: Regular Contributor
timestamp: August 02, 2025, 05:45:38 am
content: Hi,I have upgraded my 11 year old Siglent 2x75MHz scope to theSiglentRigol DHO814. I followed the posts about it for some time and now it's on my desk.I use it for more basic stuff so I think this one wil do it all and more.For reference, I'm in The Netherlands, bought it from a local well known company.The scope now has a lockable USB-C plug and this was new to me, a good upgrade I think. As soon as I connected the scope to my network it asked to upgrade the firmware, also nice.Just wanted to share these two (new to me) features.

author: gamalot
author_rank: Super Contributor
timestamp: August 02, 2025, 06:59:21 am
content: I think your new toy is Rigol, not Siglent.

author: 5U4GB
author_rank: Super Contributor
timestamp: August 02, 2025, 10:32:44 am
content: Quote from: gamalot on August 02, 2025, 06:59:21 amIt self-identifies as a Siglent

author: Rolo
author_rank: Regular Contributor
timestamp: August 02, 2025, 12:42:18 pm
content: Looking at the Siglent for so long gives a bias, it showed in my first post, it's corrected now.The new one is a Rigol.

author: Sorama
author_rank: Frequent Contributor
timestamp: August 02, 2025, 12:52:57 pm
content: Congrats.You mind explaining why not a Siglent anymore?

author: Rolo
author_rank: Regular Contributor
timestamp: August 03, 2025, 11:30:04 am
content: The Siglent served me well. I bought it in 2014, it now developed a fault with the encoders, they work but it's a bit bumpy, not mechanical but the effect on the waveform. Still usable but not nice to operate. But after 11 years I'm not complaining, it was a low budget scope to begin with. I liked the Rigol after Dave's review(s), I like the form factor, also there is more info around about the Rigols(s). I went for the 100MHz, 4 channel model, If I buy something every ten years, better get the full spec one. I have no need for the logic analyser on de DHO900 series. I have a Saleae Logic 8 for that.In the picture are the decoders that have the bumpy effect.

author: stj
author_rank: Super Contributor
timestamp: August 03, 2025, 01:40:59 pm
content: the Rigol is better because it has HDMI.if you watch dave's video's he hooks this scope to a BIG monitor with a usb touch-sensor and even the touch works!i suppose it can also be used by youtube/twitch repair guys to overlay the scope image like they overlay microscope images.
Partially calibrate DPO4000 / MSO4000? - Page 1
Forum section: electronics / testgear

author: okw
author_rank: Frequent Contributor
timestamp: August 02, 2025, 10:31:16 am
content: I recently got a second hand DPO4034, but it is quite off. Is it possible to calibrate only DC voltage? I read the service manual, but it seems it goes through all steps, and calibration is only saved at the end if all is passed.Google AI tells me differently, but I don't trust it.

author: squadchannel
author_rank: Frequent Contributor
timestamp: August 02, 2025, 11:06:57 am
content: no errors? Do you have any photos? if it's an offset problem, it should be fixed with run SPC.

author: okw
author_rank: Frequent Contributor
timestamp: August 02, 2025, 12:05:16 pm
content: I get SPC error at startup.

author: squadchannel
author_rank: Frequent Contributor
timestamp: August 02, 2025, 01:20:20 pm
content: Did you perform a self test?

author: okw
author_rank: Frequent Contributor
timestamp: August 02, 2025, 02:00:40 pm
content: I did and all self tests pass.But when I do SPC, it fails.
Power supply review by: Catz Spiritual & Qigong Health TV - Adios 3D Chao - Page 1
Forum section: electronics / testgear

author: Doctorandus_P
author_rank: Super Contributor
timestamp: August 02, 2025, 03:41:26 am
content: Laugh? Cry? Both? (and in what order?)https://www.bitchute.com/video/YiePuX7k6OKHOr maybe just be speachless...Edit: struggling to add something positive:1. The video is only two minutes long.2. It's a good example of why it's nearly impossible to get a 100% percent positive feedback for shops.

author: KungFuJosh
author_rank: Super Contributor
timestamp: August 02, 2025, 04:24:09 am
content: She watched some guy on the internet, so she knows what she's doing. No load needed!

author: Kean
author_rank: Unknown
timestamp: August 02, 2025, 10:23:38 am
content: Posted 4 years ago and no comments, so I think it is fair to say that anyone who watched it was left speechless...At least in terms of replying to her, because I certainly said a few unrepeatable things to the world at large.
New Uni-T PSU available UDP3305S-U - Page 1
Forum section: electronics / testgear

author: Ohaya
author_rank: Newbie
timestamp: August 02, 2025, 08:40:18 am
content: Hi all,This morning I was checking out the Uni-T website to have another look at their PSU prices and could no longer see the UDP3305S-E. I have found a UDP3305S-U with manuals and datasheets published in June 2025. Used AI to find out more but it wasn't aware.Does anyone know anything?
List of HP spectrum analyzers - Page 1
Forum section: electronics / testgear

author: aarons
author_rank: Regular Contributor
timestamp: July 19, 2025, 07:45:04 am
content: I got the bug that I needed a spectrum analyzer for <reasons> and so I started watching auctions and checking ebay. What would usually happen is I'd see an analyzer for sale, then I'd look up the spec sheet for it and either rule it out or make a mental note of it as a 'maybe' because it seemed good, but I kept finding new models so I was never confident that I've found my ideal unit.I was concentrating specifically on old HP gear (although there is a tek 2797 on ebay that kept catching my eye), so I decided to start going through the old HP catalogs and making a spreadsheet of their offerings over the years. What I have is far from complete: At first I was concentrating mostly on recording the model numbers, but was skipping the "S" models that are like a computer with a rack of equipment. I also would sometimes skip dynamic analyzers, or vector analyzers, but now I think they should probably be included. I added columns for specifications I cared about, and haphazardly populated cells, so there is lots of missing info. Also, the columns are for rough comparisons, since obviously the specifications for these are loaded with footnotes and ranges, etc.The actual solution for having one big repository of all spectrum analyzers sourced by the community might be a wiki, or maybe even just a CSV in github that people can submit pull requests to, but what I have right now is an excel file exported from Numbers.

author: stretchyman
author_rank: Regular Contributor
timestamp: July 19, 2025, 08:17:37 am
content: Just get an MXA . CH is chucking them out as they dont do 5G. They've enabled ALL the options so a most useful instrument.instrument!.

author: dxl
author_rank: Regular Contributor
timestamp: July 21, 2025, 08:37:20 pm
content: Keep in mind that these hacked options are probably preventing you from installing any firmware updates or sending it to calibration. That last thing is likely not important for hobbyists, but the first one might.

author: Tantratron
author_rank: Frequent Contributor
timestamp: July 28, 2025, 05:07:50 am
content: How about Advantest spectrum analyzer (i.e. R3261 R3361) ?

author: stretchyman
author_rank: Regular Contributor
timestamp: August 01, 2025, 08:28:29 pm
content: Firmware updates?Its running Win7 bud.No firmware updates are available or necessary as it already does everything.As to the 'Hacked' firmware they're legit hacks just like all the other hackable instruments out there.Go and spend £50K on a new one then..Duh...
Siglent SMM3000X Source Meter - Page 1
Forum section: electronics / testgear

author: mightymike83
author_rank: Newbie
timestamp: August 01, 2025, 09:16:58 am
content: It seems no one talks about the new SMM3000X series source meter from Siglent, which is currently released in the Chinese domestic market. The specs are really competitive and the prices are good too. The starting price for the single channel is 38,680 Yuan (～5371 USD).The screenshot is the specs comparison with other SMUs.Source:https://www.siglent.com/products-overview/smm3000x/

author: tautech
author_rank: Super Contributor
timestamp: August 01, 2025, 10:12:03 am
content: Already spottedhttps://www.eevblog.com/forum/testgear/siglent-40-mhz-real-time-bandwidth-smu-coming/

author: mawyatt
author_rank: Super Contributor
timestamp: August 01, 2025, 02:53:48 pm
content: Would be interesting to see how this performs!!Best
LeCroy WaveRunner Xi Service Manual - Page 1
Forum section: electronics / testgear

author: perdrix
author_rank: Frequent Contributor
timestamp: July 15, 2021, 09:36:09 am
content: For those of you that have one of these 'scopes and are in need of the service manual, you can get it from LeCroy.I sent an email to support@teledynelecroy.com asking nicely it they would let me have soft copy of the WR-Xi Service Manual.Not long after an email turned up with links to download all the chapters (apart from Chapter 5 which LeCroy UK had already sent me).I asked if I could make in generally available, but they said they'd rather keep track of who has the manual.Unfortunately there's no schematics.So if you want a copy, just send them an email ...HtHDavid

author: sq8cbu
author_rank: Newbie
timestamp: July 31, 2025, 06:41:19 am
content: Hi , DavidI also sent a request for a service manual, but I wasn't as lucky as you. Could you send me those documents?Best regards,Andrzej
Anyone tried to decode Fluke 45 display protocol - Page 1
Forum section: electronics / testgear

author: octal
author_rank: Contributor
timestamp: July 30, 2025, 02:08:57 pm
content: Hello,did any one of the community tried to decode the protocol between the Fluke 45 processor and the VFD display? I would like to design a new display for it but couldn't find the protocol information. Do you know about additional source of information (schematics, detailed service manuals, ...).Thx
Looking for Perkin Elmer OptiQuant software - Page 1
Forum section: electronics / testgear

author: MindBender
author_rank: Regular Contributor
timestamp: May 29, 2022, 08:46:34 am
content: Hi,This is a bit of a long shot, but I’ve been looking for it for a long time, so it is time that I try my luck here. I’m trying to get an ‘old’ Perkin Elmer (previously: Packard) Cyclone phosphor image storageeBay auction: #scanner to work, but it came with very specific scanner software named OptiQuant. I believe the latest version, compatible with Windows 7, is version 5.0. Unfortunately it is a bit too old download from perkinelmer.com, and too obscured to find anywhere else.The Perkin Elmer Cyclone Storage Phosphor System is a piece of medical/research laboratory equipment that scans ‘phosphor’-plates used for X-Ray imaging. ‘Phosphor’, because these plates do not contain phosphor, but europium, an element that when exposed to X-Rays, gets in an excited state, and holds that state for a prolonged time. When hit with (infra-) red light, it falls back to it’s normal state, releasing a blue photon. Ideal for X-Ray imaging. These scanners are available in a wide range of prices:eBay auction: #284144214191eBay auction: #334018931600If anybody could help me out with a copy of OptiQuant, I’d be really grateful.Cheers!

author: dtresearcher
author_rank: Newbie
timestamp: December 22, 2022, 03:17:04 am
content: did your system come with phosphor sheets for you to expose with radiation, and then read in the cyclone unit?if you want to PM me, I have the software.

author: Cyan10085
author_rank: Newbie
timestamp: July 30, 2025, 12:04:54 pm
content: Hi, this may come a bit late, but I wanted to follow up and ask if you were able to get hold of the OptiQuant software. If so, would it be possible for you to share a copy with me?I’d really appreciate your help!
Rigol MSO5000 front panel cover alternatives - Page 1
Forum section: electronics / testgear

author: peteri
author_rank: Newbie
timestamp: January 29, 2021, 06:42:05 am
content: I have just bought a Rigol MSO5104 and I'm now a bit twitchy that I will damage the front panel somehow.Rigol sell a cover plate for the frontpanel but it's feels a bit expensive and also doesn't give me anywhere to store probes and stuff.So does anyone have any alternatives for protecting an oscilloscope. I have been thinking of things like camera or projector bags.

author: rvalente
author_rank: Frequent Contributor
timestamp: January 29, 2021, 09:55:54 am
content: You may cut and glue plastic sheets or 3d print a protector

author: Ghislain
author_rank: Regular Contributor
timestamp: January 29, 2021, 12:47:22 pm
content: Apply a decent screen protector to begin with but if you also want to cover the knobs your options are limited.I have one of these when transporting the scope (or other precious equipment)https://www.amazon.com/stores/BWInternational/OutdoorCases_OutdoorCases/page/5FAC1BD8-3F53-4DC8-BB6C-59E1E8169E8C?productGridPageIndex=2

author: peteri
author_rank: Newbie
timestamp: January 29, 2021, 04:54:58 pm
content: Thanks both, I think some sort of hard shell case is probably the way to go.Just wondered if I was missing something cheap that everyone uses instead.

author: dc8wan
author_rank: Newbie
timestamp: July 31, 2025, 03:11:20 am
content: You can use this projecthttps://www.printables.com/model/67398-rigol-mso-5000-front-cover?lang=de
Kikusui 6100M  (It had to be done) - Page 1
Forum section: electronics / testgear

author: watchmaker
author_rank: Unknown
timestamp: July 31, 2025, 11:19:57 am
content: I know it is a dinosaur (somewhat akin to the recently demised wooly mammoth), but it was an essentially new university grant purchase that sat in the closet for years. Still had probes, mesh screen and fliter bezel, plus the front cover. A little embarrassed that I paid $125, but I always was a sucker for high quality tooling I could buy cheaply. There were some tools/machines that I used only once every couple years, but when you needed it, those tools were the only thing that could do the job.I checked it for accuracy on amplitude, sweep time and delay. Spot on. Other analog scope I had/have needed three hours of adjustment. Totally unlike Imsaiguy's experience on youtube. But I paid twice as much as did he.Anyway, I think it does something that the Siglent 824 cannot: displays asynchronous signals "simultaneously" (alt mode). The pic below shows a 50kHz sine a 1MHz square displayed simultaneously; each triggered independently.This caused me to look at my COS5100. Turns out it does the same thing but a little differently. I have had that scope since joining and may well have caused confusion when I tried to get my first Siglent scope to emulate this. I found the Kikusui feature by accident and could not replicate so I just moved on. Interesting technology, although damned if I know what to do with it.Guess I will have to start playing with scope art. It will sit on the shelf as a trophy while my Siglent and AD3 are my goto's. At least it is protected from idiots dumber than me.The downside is this scope is heavy, 24 lbs and BIG, maybe 8 time larger than the Siglent 824. Sadly, I could not sneak it in past my wife. But come the AI revolt, it will become valuable since it does not connect to the internet. Maybe I can rent it for movie props?There is one valuable feature included in the topline analog scopes that I wish Siglent would include: a front panel grounding lead jack. This eliminates the need for the ground clip on the probe for low freq work which in my mind makes things safer without that damned probe mounted ground clip.Now I gotta decide whether to sell my COS5100 or my Trio/Kenwood CS 2100 (BK 1590).

author: lowimpedance
author_rank: Super Contributor
timestamp: July 31, 2025, 11:50:45 am
content: They are nice CRO's, solid quality unit with some nice features.I have one and prefer it over similar Tektronix 'contemporaries', think 400 series.The price will be long forgotten when you enjoy using it. I'd say we'll done actually

author: Grandchuck
author_rank: Super Contributor
timestamp: July 31, 2025, 02:07:43 pm
content: Congratulations watchmaker. That is a handsome instrument
Isolation transformer using step down 240v to 120v and Variac. - Page 1
Forum section: electronics / testgear

author: zappa916
author_rank: Newbie
timestamp: July 28, 2025, 12:36:51 am
content: The idea is to reverse the Transformer and feed 120v from a Variac for an isolated 240v output.Would this setup work to provide the galvanic isolation I need for an isolation scenario?Originally toyed with the idea of two 240-120v Tfs back to back , but I think the Variac setup would be a more robust sol >:(ution.

author: langwadt
author_rank: Super Contributor
timestamp: July 28, 2025, 12:47:46 am
content: if you have two 240-120, use them primaries in parallel, secondaries in series?

author: Doctorandus_P
author_rank: Super Contributor
timestamp: July 28, 2025, 02:34:53 am
content: Yes, this works. I've built something similar (sort of).Over 30 years ago I scavanged old equipment, and among that equipment was a variac, but unfortunately only a small one of 0.8A. But I also scavenged a 2x 40V 3A transformer. So I combined them, and added some diode bridges, switches and electrolitics and put it all in a box. It is now a pretty universal rough power supply:Direct from the variac:0 to 230Vac (not isolated).0 to 300Vdc (not isolated)And from the transformer:0 - 40Vac0 - 55Vdc0 - 80Vac0 - 100VdcYou can use regular mains transformers backwards, but they still have their limits. There is always a bit of loss, so the output voltage will be a bit lower.Impedance gets higher when chaining the transformers, so the voltage will sag a bit more under load too.And the voltages on transformers are usually also quite close to the saturation of the core, so do some measurements for that. To test for this, you can build an auto-transformer. for example if you take a normal isolated transformer from 230Vac, to 24Vac, then you can connect the primary and secondary windings in series to get a total output voltage of 254V. And you can use that to test where your "other" transformer starts going into saturation. Just slowly increase the voltage with the variac, and at some point the current will start to increase at a steeper rate.I do advise you test it all on your bench thoroughly before you make a final combination and put it in a box. Also be aware that mains voltage is not constant, and varies within a certain tolerance. You want to make sure you do not have saturation problems when the main voltage is at the top of it's tolerance. Here in the Netherlands, nominal mains voltage is 230Vac, but it can be as high as 253V. Especially when lots of solar panels are pushing a local area the voltage goes up. But above 253V, these things are required to turn themselves off.
How to understand Morion MV89 OCXO specifications from its imprint - Page 1
Forum section: electronics / testgear

author: RBBVNL9
author_rank: Frequent Contributor
timestamp: July 28, 2025, 07:59:52 am
content: Hello,I have a Morion MV89 OCXO and would like to understand it’s specifications. The data sheet (attached) explains how the order number related to temperature range, aging values, etc. But the information printed on the device itself does contain information in a similar format (see attached photo). Does anyone know how to determine the specifications from the device imprint?Thanks, RudiYT: Rudi's Electronics Lab
zoyi zt-703s - Page 1
Forum section: electronics / testgear

author: PerranOak
author_rank: Frequent Contributor
timestamp: July 27, 2025, 02:09:59 pm
content: Does anyone know the latest firmware version for this?I have v139 but have heard there is a later one.Cheers.

author: tutochkin
author_rank: Contributor
timestamp: July 27, 2025, 02:24:58 pm
content: https://www.eevblog.com/forum/testgear/new-zoyi-multimeteroscilloscopes-zt-70xs-up-to-50mhz250msps-(nov-2022)/1250/

author: OLderDan
author_rank: Regular Contributor
timestamp: July 27, 2025, 09:35:23 pm
content: Get the latest firmware here, ATM it is 1.57.https://zotektools.com/products/triple-in-one-instrument-combining-oscilloscope-multimeter-and-signal-source/
Moderately priced Wiistar 24 bit 96 kHz USB Digitizer - Page 1
Forum section: electronics / testgear

author: bb1
author_rank: Regular Contributor
timestamp: July 24, 2025, 03:55:46 pm
content: Many laptops only have mono microphone input.“Wiistar USB2.0 Audio Capture Card” $18 on Amazon dongleprovides a reasonably good 2 channel 24bit 96kHz digitizer.As usual, claim of USB2.0 only means that the device willnot refuse to work with USB2.0 PC ports.Data transmission is done using USB 12MHz Full Speed.The dongle is identified by PC as "Microphone", but actually is a Line Input.Maximum input voltage is about 2Vpp, no matter what is the "Microphone Levels" PC setting.Maximum digital output values are +-32k in 16 bit mode and more than 8Meg in 24 bit mode.They only can be approached if "Microphone Levels" is set high enough.The value 100 of "Microphone Levels" may cause distortions,a little bit less would be fine.Attached is Python output screenshot of the captured signal at the input voltage of 3Vppand the "Microphone Levels" value of 50 in 16bit 96kHz mode.The output digital levels are saturated at about 6000 amplitude.Such saturation is avoided if "Microphone Levels" is set to 85.Another attached Python screenshot shows captured digital 24bit 48kHz signalof the amplitude about 6 Million.The spectrum shows distortions about 73 db below the signal.These distortions are not due to the dongle.They are caused by the Rigol signal generator.Better input signal is provided bycell phone with a 3.5mm connector using an online waveform generator.As observed using Adobe Audition 32bit 96 kHz capture mode, harmonics are about -100 dBfor the -10 dB input signal.Another Audition screenshot demonstrates that the input bandwidth of the dongleis about 22kHz even for the 96k sampling frequency.More accurate measurements show that the dongle bandwidthis between 6Hz and 22kHz at -3db.It is fine for audio, but unfortunate for the SoftRock-like SDR.

author: bb1
author_rank: Regular Contributor
timestamp: July 26, 2025, 08:38:52 pm
content: Attached is a short Python program which creates a "Quick and Dirty" real time 24 bit oscilloscope/spectrum analyzer output window.It was used to create one of the screenshots shown in the previous post.“As is” the program shows left channel data.Trivial changes can be used to modify the program for 16 bit input and/or right channel data.
wanted: PREMA 6001 EPROM Firmware File - Page 1
Forum section: electronics / testgear

author: DL8EBD
author_rank: Newbie
timestamp: July 27, 2025, 11:10:44 am
content: Hi everyone,I am looking for an EPROM firmware file for a PREMA 6001 multimeter.Thank you very much.

author: squadchannel
author_rank: Frequent Contributor
timestamp: July 27, 2025, 11:21:38 am
content: https://groups.io/g/PremaDMMlets ask them.

author: DL8EBD
author_rank: Newbie
timestamp: July 27, 2025, 11:28:43 am
content: Thank you.I have joined the group....and got the desired binary
Tektronix TDS340A, Timing calibration issue. - Page 1
Forum section: electronics / testgear

author: xenonfire
author_rank: Newbie
timestamp: July 25, 2025, 03:38:07 pm
content: I have an older 340A in excellent condition, but the battery ran out and I lost the calibration data.Battery is changed.I've completed all calibrations without issues — except for "TIMING".No matter what I do, I can't get it to "PASS". Could it be that my function generator is too poor, since it has a 6.5 ns rise time?For those of you who have done this calibration: what voltage did you feed in, and how did you handle the offset on the square wave itself?
Siglent ssa3021x plus. What am I doing wrong and where do I go next. - Page 1
Forum section: electronics / testgear

author: Sunlitcomet
author_rank: Contributor
timestamp: July 23, 2025, 06:10:55 pm
content: Got my unit and carried it up to the 3.2ghz but no codes I have for options are being accepted. Response comes back as invalid license. Entering them thru the web interface instrument control give me that. The scpi interface does not activate either, individual options or the "all" as well. Where am I goofing?Also i want to go the vna path next. Can someone point me to a message that has the whole procedure written out bin one fell swoop? i have combed hundreds of messages and i cant find what i thought was the whole thing layed out in one message. its driving me bonkers.

author: coromonadalix
author_rank: Super Contributor
timestamp: July 23, 2025, 06:56:06 pm
content: please do a proper search, and you should not post your SN and machine ID, but it is hardware dependent for unlocking ...ssa to sva conversion for the PLUS is discussed here plenty, yeah it's lenghty but ...and for keygens: you have the "Siglent unified keygen script" ... please do read for its operation(s) but in my case fail on some instruments, there are other(s) published here ...if you connect thru usb, you need visa drivers, NI Visa or Rhode Schwartz or Keysight onesand once you enter your code thru MCBD xxxxxxx you need to restart the machine to see if it was accepted or simply rejected / no effects

author: Sunlitcomet
author_rank: Contributor
timestamp: July 23, 2025, 07:21:03 pm
content: i have been searching and reading page after page after page and i am getting lost in it all. thought some might remember what i mentioned and help point to it. i have two scripts and the first did not work at all for the ssa just scopes. and the options fail to show before and after boots. Wll keep trying.

author: Sunlitcomet
author_rank: Contributor
timestamp: July 23, 2025, 07:47:05 pm
content: The script results do not provide the number and the instructions in to skip that step based on the model series i have.

author: KungFuJosh
author_rank: Super Contributor
timestamp: July 23, 2025, 08:14:10 pm
content: Quote from: 807 on October 16, 2023, 11:39:34 pm

author: Sunlitcomet
author_rank: Contributor
timestamp: July 23, 2025, 10:10:19 pm
content: Thanks that helped with options not enabling. I found a more specific script for the analyzer which was much less cluttered.

author: Sunlitcomet
author_rank: Contributor
timestamp: July 23, 2025, 10:17:28 pm
content: Now I just have to backtrack that article to get the cross flash done and see if my internal jumper is there or not. Thank you all.
MSO5000 Jitter and Eye Diagrams missing from new firmware - Page 1
Forum section: electronics / testgear

author: AngusBeef
author_rank: Regular Contributor
timestamp: July 23, 2025, 07:42:04 pm
content: Just wanted to save the future internet from searches as I couldn't find a clear answer, it appears these were removed from Measure/Analyze menu after v1.03.00.03 (2021/10/18) if my google-fu is correct. Of course nothing was mentioned in the changelogs :\I updated my scope recently from this older version to v1.03.03.0 (2023/02/22) and then couldn't find them under analyze, so downgraded to get them back.Something that may be of interest to someone else considering to update their firmware for the MSO5000 if you use these functions.Changelogs below:v00.01.03.03.00 2023/02/22- Patch for MSO5000 series NAND flash- Added query instructions for gain and offset settings in function operator AX+B- Vertical minimum range restored to 500 microvoltsv00.01.03.02.02 2023/01/04- Added shortcut keys and VNC remote function- Optimized waveform, cursor movement, gesture operation vertical and horizontal range switching speed- Cursor optimization: optimized cursor jump situation, ZOOM region and main time base cursor linkage, etc.- CH4 waveform color modification, waveform brightness enhancement- ZOOM mode optimization: mask color adjustment, switching speed, region movement optimization- SCPI command response speed optimization: reset, measurement, waveform read command response optimizationv00.01.03.00.03 2021/10/18- Optimized waveform display in XY mode- Optimized DC gain calibration algorithm- Parallel decoding of LA channels, resolved decoding error issue with negative polarity

author: Martin72
author_rank: Super Contributor
timestamp: July 23, 2025, 10:20:40 pm
content: Hi,My memory may be deceiving me, but it's been a while since I owned an MSO5000 for over a year.However, eye diagrams and jitter were not part of the available options for the MSO5000, but rather the result of a hack.These features are part of the MSO8000, which makes sense given its bandwidth.So you haven't lost anything that wasn't intended for the 5000 series anyway.

author: J-R
author_rank: Super Contributor
timestamp: July 23, 2025, 11:32:32 pm
content: The JITTER option isn't available on the MSO5k and even when enabled on the hacked firmware it doesn't actually work, according to this:https://www.eevblog.com/forum/testgear/hacking-the-rigol-mso8204-mso8000/msg5632237/#msg5632237

author: sorenkir
author_rank: Regular Contributor
timestamp: July 24, 2025, 10:24:42 am
content: Hi,I have managed to make Jitter Analysis work in the past (I am not expert but at least, it seemed to give some results). But no luck with Eye Analysis.See:https://www.eevblog.com/forum/testgear/mso5000-jitter-and-eye-diagrams/msg4451692/#msg4451692If I remember well, these option were active in the original firmware and also after upgrade and hack using the 'old' patch method.They disappeared after using the 'new' licensing method hack.Michel.
Riden RD 6018P Impossible to insert power connector - Page 1
Forum section: electronics / testgear

author: WiboS
author_rank: Newbie
timestamp: July 23, 2025, 12:17:19 pm
content: My new Riden RD 6018P (the new version with greater accuracy) has a strange problem.The power input connector (they call it the HT508K/K14 interface) cannot be placed in the socket, because the big inductor is in the way.Does anybody else have this problem?Please see attached photos.The inductor is too rigid to just bend it into another position.

author: Grandchuck
author_rank: Super Contributor
timestamp: July 23, 2025, 12:52:33 pm
content: Heat the board/solder joints to allow it to be moved?

author: electr_peter
author_rank: Unknown
timestamp: July 23, 2025, 04:01:04 pm
content: Soldering issue, either sort it out with the seller or fix it yourself.Where did you buy this item? Riden (RD Tech) on aliexpress are very responsive to any issues/suggestions.

author: coromonadalix
author_rank: Super Contributor
timestamp: July 23, 2025, 04:58:03 pm
content: dont push the coil, it could damage pcb traces, you really need to un-solder the big coildo note its position and try to gently bend the pins to help / move it away for the green connector

author: WiboS
author_rank: Newbie
timestamp: July 23, 2025, 05:48:18 pm
content: I am in contact with them (RD Tech from Ali Express), they want me to bend the coil but I am reluctant to do this. It is very rigid and I already pushed it with a reasonable amount of force. Resoldering it could also be a solution, but then I need to disassemble the board. I'm not convinced do that, due to the risk of damage. Maybe just return the item.

author: Grandchuck
author_rank: Super Contributor
timestamp: July 23, 2025, 05:57:05 pm
content: Good luck
DSOX4024A BW upgrade possible? - Page 1
Forum section: electronics / testgear

author: Drirr
author_rank: Regular Contributor
timestamp: June 24, 2025, 10:10:13 am
content: Hi,My friend asked me if it’s possible to upgrade the bandwidth of a Keysight DSOX4024A. I'm not very familiar with Keysight oscilloscopes myself, so I did some research here on the EEVblog forum.However, the information I found is somewhat conflicting — some users suggest it’s just a matter of a software key, while others mention hardware differences or potential limitations.Could anyone clarify the current situation? Is it still possible (as of 2025) to unlock higher bandwidths (e.g., 350 MHz or 500 MHz) on the DSOX4024A using unofficial methods?Any guidance or links to relevant threads would be greatly appreciated.Thanks in advance!

author: electr_peter
author_rank: Unknown
timestamp: June 24, 2025, 10:18:20 am
content: Check this theaddsox2000-and-3000-series-licence-have-anyone-tried-to-hack-that-scope

author: HighVoltage
author_rank: Super Contributor
timestamp: June 24, 2025, 10:53:28 am
content: Quote from: Drirr on June 24, 2025, 10:10:13 amThe bandwidth of the 4000x series scopes can not be upgraded by software. This is only possible on the 6000x

author: TheSteve
author_rank: Unknown
timestamp: June 24, 2025, 03:27:30 pm
content: Hardware changes are required to go above 200 MHz(it is possible to do, 500 MHz might not be too bad).

author: JacobPilsen
author_rank: Regular Contributor
timestamp: July 23, 2025, 11:07:32 am
content: Quote from: Drirr on June 24, 2025, 10:10:13 amIf your friend decides to open his DSOX4024A, please ask him to take detailed photos of internals of his unit.Especially the analog front end.Then we can compare them with EEVblog #384:https://www.eevblog.com/forum/blog/eevblog-384-agilent-4000x-oscilloscope-teardown/andhttps://www.eevblog.com/forum/repair/dso-x-4154a-no-display/At first glance, it doesn't look significantly different technologically than the MSOX2012A.