hybridfree/eevblog-posts huggingface dataset:
Looking for firmware content of the Agilent 33250A - Page 1
Forum section: electronics / testgear

author: dimmog
author_rank: Regular Contributor
timestamp: June 19, 2025, 01:57:01 am
content: I have a 33250A (MY serial number) with corrupted Flash memory chips. The main board is a newer revision that uses the BGA version of U1201.Someone on the EEVblog forum shared firmware version 2.01, but it appears to be for the older board revision (US serial number) and doesn't work with mine.If anyone happens to have a newer firmware version compatible with the updated board, I'd be very grateful if you could share it.

author: Rubo
author_rank: Regular Contributor
timestamp: June 19, 2025, 02:33:02 am
content: Have you tried the file linked in this post?https://www.eevblog.com/forum/repair/need-agilent-33250a-firmware/msg1014936/#msg1014936

author: dimmog
author_rank: Regular Contributor
timestamp: June 19, 2025, 02:43:27 am
content: Quote from: Rubo on June 19, 2025, 02:33:02 amYes, that's an older version and it doesn't work with the newer board revision.

author: Rubo
author_rank: Regular Contributor
timestamp: June 19, 2025, 01:29:31 pm
content: Are you sure?The reson I ask is because of the following posts:Quote from: jgorsk on August 30, 2016, 09:13:35 pm&Quote from: TheSteve on September 10, 2016, 10:27:13 pm

author: dimmog
author_rank: Regular Contributor
timestamp: June 19, 2025, 08:51:25 pm
content: Quote from: Rubo on June 19, 2025, 01:29:31 pmThanks for pointing that out. It's hard to believe that both the Flash ROM and SRAM chips failed at the same time.I've ordered new SRAM ICs and will try swapping them. I'll post an update once they arrive.Thanks again.

author: Rubo
author_rank: Regular Contributor
timestamp: June 19, 2025, 11:36:08 pm
content: No worriesKeeps us posted.

author: dimmog
author_rank: Regular Contributor
timestamp: June 24, 2025, 03:59:15 pm
content: Replacing the SRAM resolved the issue. The fault was with U203. I replaced both U203 and U204 just to be safe. It's hard to imagine how both the Flash ROM and SRAM could have been damaged at the same time. I also checked the power supply, and all voltages and ripple are within spec.Rubo, thanks for your help.

author: TheSteve
author_rank: Unknown
timestamp: June 24, 2025, 06:03:08 pm
content: Quote from: dimmog on June 24, 2025, 03:59:15 pmThat is the same as the 33250A I repaired years ago, bad ram and corrupted flash. Maybe the bad ram somehow causes writes to the flash.

author: Rubo
author_rank: Regular Contributor
timestamp: June 24, 2025, 07:50:59 pm
content: You are most welcome dimmog
The Service manual for the HP1742A - Page 1
Forum section: electronics / testgear

author: Sleep Deprived Tommy
author_rank: Newbie
timestamp: June 24, 2025, 12:00:02 am
content: Hello everyone, i have recently acquired a HP1742A out of a auction for a sweet price, however it didn't come with the service manual and every single one that i was able to find on the internet was scanned in a horrible manner and a lot of things are outright unreadable, if anyone has a high quality scan of it, i would be very glad if they may share it with me, thanks in advance
HP 75000 Series B (E1301B) ibasic upgrade - Page 1
Forum section: electronics / testgear

author: Eroic
author_rank: Newbie
timestamp: June 22, 2025, 01:40:42 pm
content: Hi,I recently aquired a HP 75000 Series B E1301B frame, the version with front panel keyboard.I want to try to play with ibasic feature but mine not have the upgrade for it, it only have the 1mb upgrade in it with standard rom kit (E1300-88831 and E1300-88832).Can someone have the four roms image to share ?Hp number of those rom should be:E1300-88805E1300-88806E1300-88807E1300-88808I already all the stuff to burn eprom. I only search for rom (bin) files.Thanks

author: Roehrenonkel
author_rank: Frequent Contributor
timestamp: June 22, 2025, 09:27:04 pm
content: ....there you go.

author: Eroic
author_rank: Newbie
timestamp: June 23, 2025, 01:41:58 am
content: Thanks Roehrenonkel, I burned the roms and the upgrade is complete.

author: Roehrenonkel
author_rank: Frequent Contributor
timestamp: June 23, 2025, 08:48:45 am
content: Hi Eroic,glad i could help.If you need the Instrument-Basic-Manual, i can upload it too.Did you replace the Schaffner line-filter?It contains the old Rifa-caps.....Good luck

author: Eroic
author_rank: Newbie
timestamp: June 23, 2025, 11:21:26 pm
content: Hi Roehrenonkel,I already found the ibasic manual on the ftp of keysight with the internet archives backup.Thanks for the hint of the Rifa capacitor, I checked and my version did not have it.
Agilent 82357B a tale of (minor) woe - Page 1
Forum section: electronics / testgear

author: siggi
author_rank: Regular Contributor
timestamp: June 23, 2025, 05:11:55 pm
content: I dug out my Agilent 82357B dongle as I'd like to save the NVRAM in my TDS784D and perhaps update the firmware. As I stay away from Windoze as much as possible, I built linux-gpib and installed it, all of which went just fine. The dongle however failed to work as advertised, instead it seemed to reinitialize in a loop.This dongle needs its firmware uploaded on connection, and according to information on the interwebs there's a bug whereby this needs to be done twice, as the upload will fail the first time.Manually futzing with the upload I saw every odd upload fail as expected, e.g. no blinking LEDs on the dongle end, whereas every even upload caused it to blink both green LEDs, but then reset to only the red LED. Throughout this the probe always enumerated with "idVendor=0957, idProduct=0518", and not "idVendor=0957, idProduct=0718", which signifies a successful firmware load.As I have used this dongle successfully in the past, I figured this had to be some kind of a bug in the firmware uploader or in linux-gpib. So I dug out an old laptop with Windoze and installed the current Keysight IO Libraries Suite. This, of course, took a good amount of time, involved umpteen reboots, software updates and endless spinners, as is the Windozed way. Sadly, when I plugged the dongle in I got the same exact behaviour, except now Windoze played me that little USB device jingle on every dongle reset.I figured this had to be a hardware problem, having read about poor soldering quality in these dongles. So I popped it open and gave it a good hard look, but everything looked just fine.However, when I plugged in the bare PCB without the casing and retried the firmware upload, it worked just fine. I'm thinking the only problem was that the USB connector on the dongle side needed to be re-seated, as I really didn't do anything else.So, I guess the lesson is that if you have one of these things misbehaving, pop it open and jiggle and/or clean the USB connector on the GPIB end - before you spend hours to days tilting at software windmills.
PulseView: Error on Win10 x64 - Page 1
Forum section: electronics / testgear

author: crysti
author_rank: Regular Contributor
timestamp: June 22, 2025, 06:44:40 pm
content: Dear all,I have a logic tester detected by the system as fx2lafw (VID:PID 1D50:608C). It works flawlessly on Windows 7 x32 with the latest PulseView release (15.05.2025). However, under Windows 10 x64 it fails to function with any PulseView version, consistently returning:“Failed to open device: generic/unspecified error”I have tried PulseView versions from 2018 through the most recent 2025 build and have used Zadig to install the drivers on both operating systems, without success.Is there a specific version or approach that ensures compatibility with Windows 10 x64?What might be the underlying reasons preventing the device from opening on Windows 10?Thank you in advance for your insights and recommendations!
Video: Vintage Tektronix Museum Walkthrough + Exclusive Restoration Room Tour - Page 1
Forum section: electronics / testgear

author: KG7AMV
author_rank: Frequent Contributor
timestamp: June 21, 2025, 07:46:46 pm
content: Vintage Tektronix Museum Walkthrough + Exclusive Restoration Room TourEnjoy.

author: tv84
author_rank: Super Contributor
timestamp: June 21, 2025, 08:55:41 pm
content: That's @Gianni's Universe!

author: BILLPOD
author_rank: Frequent Contributor
timestamp: June 22, 2025, 08:01:56 pm
content: Thank you, KG7AMV, I enjoyed that tour VERY much. Fascinating...absolutely fascinating!!

author: KG7AMV
author_rank: Frequent Contributor
timestamp: June 23, 2025, 06:25:57 am
content: Quote from: BILLPOD on June 22, 2025, 08:01:56 pmMain Mission that day was the Tektronix Factory Surplus Store I walked away with about 40lbs of chips and misc. components.I Spent about 6.5 hours sorting and backing up various programmables.https://youtube.com/live/6U9ADQovUoYOne day will look up the part numbers and tie in to a model archived on xdevs. I have tons more to backup this is just day 1.
HP 34401A GPIB BUS Trigger not work - Page 1
Forum section: electronics / testgear

author: Eroic
author_rank: Newbie
timestamp: June 22, 2025, 01:59:23 pm
content: Hi,I recently played with my two HP 34401A and PyVisa (i use GPIB-USB-HS with NI driver on Windows), When I try BUS Trig, my two DMM did not response (but other equipment react ont gpib chain).After some research, i had read that some old version of firmware have this trouble and it corrected with firmware upgrade, my two DMM have 04-01-01 and 05-01-01 firmware.If I understand correctly, I need to upgrade to XX-05-YY to correct this problem, Thaht right ?Can someone have firmware files ready to share for upgrade my two DMM ?I have all stuff to write the rom/flash chip.Thanks

author: Kean
author_rank: Unknown
timestamp: June 22, 2025, 02:50:45 pm
content: There is a GPIB issue documented in service note (SN) 8. Not sure if what you describe is the same issue.You will find firmware on KO4BB site athttps://www.ko4bb.com/getsimple/index.php?id=manuals&dir=HP_Agilent_Keysight/HP_34401A_6.5_Digit_MultimeterLook for the file for U700 which will contain the v5 BIN file. I don't think this is officially released, but someone was able to extract it.I've not needed to try this as mine were acquired already running 11-05-02 or 11-05-03.Note that your front panel firmware is 01 (the last two digits) and that is only compatible with "06-04-01 and lower" according to SN 6. But that obviously predates SN 8 which implies it should be compatible.Measurement processor firmware 10 is available online, but because of the older front panel you have you cannot upgrade the measurement processor firmware beyond 06 (if you can find it anywhere).You can download the 34401A services notes still athttps://support.keysight.com/s/service-notes?language=en_USMore discussion on firmware here, as well as potentially sourcing replacement front panelshttps://www.eevblog.com/forum/testgear/agilent-34401a-revisions/
psg9080 signal generator - Page 1
Forum section: electronics / testgear

author: Mike Oglesby
author_rank: Newbie
timestamp: June 21, 2025, 08:30:36 pm
content: I have a PSG9080 and would like to use it to calibrate a timer. Is there a way I can trigger the counter mode timer to start and stop with an external ttl trigger. The idea is that I would start counting the 1 sec pulses from my GPSDO output with the frequency counter when my device signals start and would stop counting when my device stops. I can then compare the counts on the device display with the PSG9080 counter.
Vintage Gem. - Page 1
Forum section: electronics / testgear

author: BillyO
author_rank: Super Contributor
timestamp: June 21, 2025, 02:29:12 pm
content: This was $14 back in 1970. About $120 now. I'd love to get my hands on one.What an awesome piece of vintage TE!Did anyone here ever have one?

author: hexreader
author_rank: Frequent Contributor
timestamp: June 21, 2025, 02:44:21 pm
content: I know nothing of that particular deviceI do remember buying things that looked similarly amazing: amplified to ten times as good in my head.Receiving the item (3 months later than the advertised 28 days) was made more exciting by the extra wait.What I would get would be a huge disappointment, but I would make the best of it anyway. The ugliest baby that only a mother could love.I just accepted it in those days.Makes me appreciate how much better that even cheap test equipment is today.I would hazard a guess that this is not "an awesome piece of vintage TE!": just typical over-hype from the era.A curse of old age is remembering that everything was so much better in the past, but forgetting everything negative. (or is self-delusion a good thing?)

author: BillyO
author_rank: Super Contributor
timestamp: June 21, 2025, 02:52:41 pm
content: Quote from: hexreader on June 21, 2025, 02:44:21 pmThat's precisely why it's awesome.

author: hexreader
author_rank: Frequent Contributor
timestamp: June 21, 2025, 03:02:11 pm
content: Quote from: BillyO on June 21, 2025, 02:52:41 pmThat makes no sense........ but I think I am in full agreement just the same.Those were new and exciting times, even if the equipment seems primitive by today's standardsHave to go now. Nurse is calling me back to the common room to take my meds and drink my Horlicks
Owon ADS800 900 disassemble short video - Page 1
Forum section: electronics / testgear

author: ptluis
author_rank: Frequent Contributor
timestamp: June 21, 2025, 12:02:57 am
content: I've found this video on YouTubehttps://youtube.com/shorts/gBUQlmmF9S0?si=epFFFxQoh4rTFZ6F

author: electr_peter
author_rank: Unknown
timestamp: June 21, 2025, 07:37:20 am
content: Interesting, Owoncopiedwere inspired by Rigol. External appearance looks very similar to Rigol DHO800/900, but internals are different.

author: ptluis
author_rank: Frequent Contributor
timestamp: June 21, 2025, 12:36:25 pm
content: Quote from: electr_peter on June 21, 2025, 07:37:20 amI haven't seen an SD card slot so booting could be a little faster? maybe yes maybe no.

author: electr_peter
author_rank: Unknown
timestamp: June 21, 2025, 01:37:01 pm
content: Owon & Rigol designs are different designs, boot times comparison will be known only after some reviews are posted.
RTO1024 (RTO1000 series) oscilloscope clock backup battery type and location - Page 1
Forum section: electronics / testgear

author: JohnG
author_rank: Frequent Contributor
timestamp: June 19, 2025, 01:39:19 pm
content: Hi folks,I have just gotten my RTO1024 scope up and running again, thanks in a large part to this thread:https://www.eevblog.com/forum/testgear/rohde-schwarz-rto1024-upgrade/.However, I have noticed that if I power down the scope and remove the AC power, the clock resets to 2006-12-31 23:00:00 plus a couple minutes for startup. At the moment, it's an inconvenience, but I would like to fix this if possible. Before I make the unlock tools and crack it open, does anyone know if this has a battery I can replace and where it is? I'm guessing it is on the PC module, but wanted to check before I make some removal tools (special thanks to@jjoonathan).John

author: jjoonathan
author_rank: Frequent Contributor
timestamp: June 19, 2025, 03:42:39 pm
content: Yep, just a plain old CR2032 on the PC module.Don't bother making tools, I found a procedure that works with standard screwdrivers: your goal is to use one screwdriver to "open" the hinge ("oil seal hooks" work great) and jam the second screwdriver into the opening to hold it open while you focus on the other one.This gallery is from before I figured out the trick with plain screwdrivers but it shows the hinge mechanism from the back:https://photos.app.goo.gl/M3uLj5EZG8Zk7qXB7

author: JohnG
author_rank: Frequent Contributor
timestamp: June 19, 2025, 09:52:01 pm
content: Thank you! The photos and videos were extremely helpful. I couldn't do it with screwdrivers, but I made a couple keys with some small steel brackets, a hacksaw, and some filing. Took me two iterations and 30 minutes total.It's working now, and I really appreciate the help.John
Agilent 546xx Oscilloscope PC Software - Page 1
Forum section: electronics / testgear

author: BlackFX
author_rank: Contributor
timestamp: February 13, 2020, 12:04:26 am
content: Hey allThis may (or not) be of some use to some of you here, I own an Agilent 54622A and I was gutted to find that none of the PC software for these scopes exists any more (and even if it did, it's for Windows and I am a Linux user)So I decided to do what any sane person would do and wrote some software for it.The software is pretty basic, just grabs the currently displayed waveform (with all offsets and scaling etc intact). It's pretty slow as it's limited to 57,600 baud. I have the GPIB add on for mine, but need an adapter for the PC.Software can be found here:https://github.com/Black-FX/scopetoolUsage is very simple:Code:scopetool [-h] [-1] [-2] [--port USB_PORT] [--speed USB_SPEED]For example:Code:$ scopetool -p /dev/ttyUSB0 -s 57600 -1 -2I have attached a couple of images of it in action.It should work on Linux, Mac and Windows.I would be very interested to hear if it works on other scopes outside the 546xx family.Enjoy!

author: dazz1
author_rank: Frequent Contributor
timestamp: May 05, 2025, 09:18:18 pm
content: HiHave you developed this further?I want to save the logic analyzer screens via gpib interface.My scope does not have a usb connector.

author: squishsquash
author_rank: Newbie
timestamp: June 19, 2025, 01:53:45 am
content: The USB would show up as a com port on your PC. You need to set up the analog connection on the PC to talk to the GPIB. So you need a USB to GPIB or a GPIB add-on card inside your PC. I have never done this specific type of communication, but that's how it would work.
Which Current probe for Fluke Scopemeter 199C? - Page 1
Forum section: electronics / testgear

author: djsb
author_rank: Super Contributor
timestamp: June 21, 2025, 11:15:11 am
content: Is anyone using a current probe with their Fluke Scopemeter 199C? If so, which one are you using or would like to use and why? Thanks.

author: BennoG
author_rank: Frequent Contributor
timestamp: June 21, 2025, 12:54:40 pm
content: when I used my 196C I used a 80i-110s current probe.nowadays I use the probe at a picoscope 3404DBenno
7-segment led digit with strange pitch - Page 1
Forum section: electronics / testgear

author: linux-dude
author_rank: Newbie
timestamp: June 21, 2025, 03:23:27 pm
content: Hi,I have an old Advantest TR6846 with very dim 7-segment display. I intend to replace the digits, 6 of them. They are marked "SEL510", probably Siemens, but I have failed to find a data sheet.The pinout is standard common anode (like LTS-4910AHR), but I struggle to find anything with this strange pitch. Its a 14-DIL with 2.56mm (100mil) pitch between pins, but 11mm between the rows as shown in the image.I could possibly get LTS-4910AHR and extend the pins, but really prefer to get the correct part if possible.Any ideas where I can source a part like this?Thanks and regards,Mike

author: jemotrain
author_rank: Contributor
timestamp: June 21, 2025, 03:34:12 pm
content: Hi,i found data sheet at:https://www.datasheets360.com/part/detail/sel510/-6827938106865068680/According the datasheet the spacing between both lines should be 10.16mm
LWLA1034 Chinese Logic Analyzer ( SOFTWARE ) - Page 1
Forum section: electronics / testgear

author: willie
author_rank: Newbie
timestamp: November 19, 2015, 02:46:01 pm
content: Did a quick search on the forum , and didn't see a recent subject on the LWLA1034 34 Channel Timing and State Analyzer.Did purchase one from a Chinese vendor recently who did deliver the product but only provided a link via Pan.Baidu.com for the full software package LWLA1034_2014_iso. That link didn't work for me and got no help from the vendor. Maybe Pan.baidu doesn't allow downloads from the US ? FYI Sigrok does support a lot of programmable test equipment , was able to verify that the hardware was operational , however its functionality is considerable less than what is advertised in Waveview.Can anyone help me obtain the software ?Seems like the software was based on the MiniLA project , however I don't see where itS available except from Pan.Baidu.Product price/performance is very good , hope I can obtain the software to run its full potential !Thanks for the help/adviseHank

author: Lightages
author_rank: Unknown
timestamp: November 22, 2015, 11:56:56 pm
content: Found my files Willie. Here you go:https://dl.dropboxusercontent.com/u/64516558/LWLA1034.zip

author: PepaZdepa
author_rank: Contributor
timestamp: June 12, 2025, 08:38:25 pm
content: Hi, maybe too late, but do you still have the software please? I can't find it anywhere...Thanks

author: Lightages
author_rank: Unknown
timestamp: June 18, 2025, 07:55:43 pm
content: I will provide a link to the file to those who ask.
UNI-T UT60E software - Page 1
Forum section: electronics / testgear

author: alanegreen
author_rank: Newbie
timestamp: November 09, 2024, 03:12:48 pm
content: Hi AllI have a UNI-T UT60E DMM, which I've had for over 10 years. I've long since lost the CD that came with it, but i now would like to be able to log data from it. I have the RS232 interface cable.I can't find the UT60E aapplication sofwtware on the UNI-T site, so can anyone point me in the right direction? Anyone have this software, or and equivalent that they can share with me?Thanks in advanceAlanCumbria UK

author: u666sa
author_rank: Frequent Contributor
timestamp: November 09, 2024, 04:25:02 pm
content: http://www.mtoussaint.de/qtdmm.html

author: redpanther
author_rank: Newbie
timestamp: June 18, 2025, 01:50:00 pm
content: Hi,look athttps://github.com/tuxmaster/QtDMMthis is the more modern qt6 port of original software. Currently I step into continue development.ciao :-)
New Keysight smart bench essentials plus - Page 1
Forum section: electronics / testgear

author: Anthocyanina
author_rank: Frequent Contributor
timestamp: June 17, 2025, 08:46:53 pm
content: So I just got a promotional email from Keysight with a link to the new smart bench essentials plus instruments. It seems like this is what the original ones should have been, 6.5 digit multimeter, 4 channel 400W power supply, and 100MHz dual channel wave gen, all using the old molding. They also added the HD3 to the list, so maybe they are discontinuing the 1000x series?everything starting from twice the cost of the previous SBE instruments tho...https://www.keysight.com/ca/en/cmp/2025/smart-bench-essentials-plus

author: KungFuJosh
author_rank: Super Contributor
timestamp: June 17, 2025, 08:57:12 pm
content: I hate that meter design. I'm not rebuilding my bench for that. 🙄

author: Anthocyanina
author_rank: Frequent Contributor
timestamp: June 17, 2025, 09:16:19 pm
content: Quote from: KungFuJosh on June 17, 2025, 08:57:12 pmI actually like that form factor better than the "traditional" ones that are long instead of tall and wide. My bench/desk is 2m wide, but only 60cm deep, so small oscilloscope-sized instruments go better there than the deep ones. When i get a bench DMM I do want it to be in that form factor. It would be cool if Siglent made one like that. They already introduced their own AWG in that small oscilloscope form factor with the SDG3000x, so maybe the DMM is next? hmm!

author: KungFuJosh
author_rank: Super Contributor
timestamp: June 17, 2025, 09:23:06 pm
content: Sure, both shapes would be good to have, but they also could make the standard version shorter. They don't need to be as deep as they used to be. Lay that shape on it's back, and it's still much smaller than the classic/standard bench meter shape.
USB power meter interop - Page 1
Forum section: electronics / testgear

author: electrolust
author_rank: Unknown
timestamp: September 09, 2020, 03:06:30 am
content: Are USB power meters generally interoperable? Specifically Keysight vs Tek?I thought for sure they are not, but then I see for Siglent SSG3000X, the ALC uses a remote power meter to do its magic. But AFAICT Siglent don't sell a USB power meter.

author: james38
author_rank: Regular Contributor
timestamp: June 17, 2025, 02:45:10 pm
content: I know this post is old, but it should still get a response.Yes, the SSG3000x, as well as some other Siglent models,can address an external USB power sensor.However, the prerequisite is that the power sensor model is also supported.These power sensors, such as the U2000A, are addressed via SCPI.Each manufacturer has its own SCPI commands,so it varies depending on the model.As long as the device supports the model, it works.I myself have an SSG3000X and a U2000A,and it works perfectly with the ALC and a resistive power divider.Regards, Chris
Hack Siglent 5000A 6000A 7000A series - Page 1
Forum section: electronics / testgear

author: Hifreak
author_rank: Newbie
timestamp: June 15, 2025, 03:17:20 pm
content: Hi new here,We have several Siglent devices that were easy to upgrade, This site is full of them......thanks.It's a different story if you want to upgrade something from the Siglent A series.I've been working on it at work after the demo time was over.Has anyone already done this? It mainly concerns the following types:SSA 5000ASNA 5000ASDS 6000ASDS 7000ASiglent changed something and now it s a lot more difficult, does anyone have any tips?With kind regards,Dean

author: Martin72
author_rank: Super Contributor
timestamp: June 15, 2025, 05:39:38 pm
content: Hi,I'm not sure if it's a good idea to hack commercially used devices.If you actually have these models at work and you need certain options permanently, you should buy them.That shouldn't be a problem for a company.Otherwise, I assume that you have already searched this forum.If you haven't found anything, it's because there is nothing on the subject.

author: Starpoint
author_rank: Newbie
timestamp: June 17, 2025, 10:29:41 am
content: This is the old way but unfortunately Siglent has changed something.Marcelhttps://youtu.be/Rjbhu3gvwT8?feature=shared

author: coromonadalix
author_rank: Super Contributor
timestamp: June 17, 2025, 12:05:49 pm
content: as written you need to read and search many threads here about that ...to simplify : closed telnet ports ... and licensing types / versions mostly known as v1 v2, maybe a v0 at some pointand clever fw management in some casesthe v2 being the newest, nothing so farAnd Siglent do learn about theses ... while not blocking thru FW updates any "cough cough" unlocked devices .....
Racal-Dana 9343M LCR Databridge service manual - Page 1
Forum section: electronics / testgear

author: perdrix
author_rank: Frequent Contributor
timestamp: January 26, 2020, 03:03:05 pm
content: Does anyone know if one exists and if so where to find it?ThanksDavid

author: PA0PBZ
author_rank: Super Contributor
timestamp: January 26, 2020, 03:17:20 pm
content: I have a lookalike, a Tinsley Prism 6451 including the users manual but not the service manual. If you have some unidentified parts I could have a look, last time I checked it still worked.

author: mssbid
author_rank: Contributor
timestamp: June 18, 2025, 04:12:18 pm
content: Did anyone succeed in getting a service manual or some schematics? I have an (identical)AIM 451 which showed only random values and LEDs. After inspecting stuff around theD.U.T connectors, I found 4 defective diodes (5V6, 2V7 and 1N4148) which serve forprotection purposes. Now measuring resistors seem to work but capacitors fail.I have the schematics of a Racal Dana 9341 but this only matches partly and only for thedigital part (which works)....
Biddle KELVIN-WHEATSTONE RATIO Photos - Page 1
Forum section: electronics / testgear

author: NANOJOLTS
author_rank: Contributor
timestamp: June 15, 2025, 01:29:04 am
content: Photos: Fresh from Fea-bay, BIDDLE-GRAY CAT. 602508 KELVIN-WHEATSTONE RATIOSET 1PPM, came with manual! Hope you enjoy the photos? Looks like similar switches used in theFLUKE 720A?Any info drop me a line.

author: lowimpedance
author_rank: Super Contributor
timestamp: June 15, 2025, 06:34:41 am
content: Quote from: NANOJOLTS on June 15, 2025, 01:29:04 amLots of vintage resistor goodness thereGood shape too.....nice.No info though..sorry.

author: Vgkid
author_rank: Super Contributor
timestamp: June 15, 2025, 07:42:50 am
content: Thanks for the teardown. I have a L&N version of one, which is a version that predates my catalog info. Unfortunately not sure if any pics are on my computer(old phone died taking a bunch of pics with it.)

author: Vgkid
author_rank: Super Contributor
timestamp: June 16, 2025, 05:00:13 am
content: Went searching, and dug up some stuff , unfortunately there were more pics :'(

author: NANOJOLTS
author_rank: Contributor
timestamp: June 17, 2025, 12:19:06 am
content: Thanks for the reply, the L&N unit looks quite similar. I'm still fiddling with the biddle. This unit seems to load down the battery/PSU?I'll keep you posted if any breakthroughs. I'd hate to throw in the towel.Norm
WZ Signal CVS III - Beware! - Page 1
Forum section: electronics / testgear

author: Aldo22
author_rank: Super Contributor
timestamp: June 16, 2025, 09:58:22 am
content: I bought a WZ Signal CVS III “Signal Generator” basically because it was cheap ($20).I won't introduce it here, if you are interested you can read about ithere(not from me).The accuracy is quite OK, but rather by accident, I saw on my ZT-225 that there was a sizable AC component in the DC signal (19mVrms/1V).I went to look at it on the oscilloscope and yes, there is a pretty fat sawtooth (approx. 150Hz).What's worse, the thing has a turn-on voltage for half a second of up to 18V!I wouldn't buy it again. Fnirsi SG-003 is way better.
Just another RIGOL DHO800/900 fan mod - Page 1
Forum section: electronics / testgear

author: NIAA
author_rank: Newbie
timestamp: October 26, 2024, 06:30:15 pm
content: Hi!Please excuse my english, as it is not my native language. I just would like to introduce myself to you with another RIGOL DHO80/900 fan mod, hoping not to bore you.As my alias adumbrates, I am an absolutely beginner to more complex electronics. But with general technical knowhow, programming skills, some craftsmanship skills and the will to learn, it was only a matter of time to get an oscilloscope for my Arduino stuff.What do I want to do with an oscilloscope?Analysing the quality of power supplies in my Arduino projects (ripple, noise).Analysing I2C stuff.Some things I am not aware of yet...Why the DHO914?Free space is valuable on my desk. So it should be a small device, although with its own screen. So, no USB device like Pico or similar.Free space is really valuable on my desk, so the VESA mount to rise the device up with a wall mount gave me a strong purchase decision.One can "update" the cheaper Rigol DHO814 to get higher frequencies. I knew that when I made my homework during the purchasing search. But the fact that I do not like devices in white color is more important for me than the price difference to a DHO814. With 830 Euros, the DHO914 scratched the very upper corner of my price range, but... okay.Of course, I watched nearly every DHO800/900 video on Youtube and read many reviews. The only thing I really disliked with the DHO800/900 was its noisy fan. As I also do some audio recording stuff, my desk environment is very quiet and it should stay as quiet as possible. Thanks to Daves "Rigol DHO800 Fan(boys) Go Wild" video, I recognised that a fan exchange should be generally possible. My inital ideas of a fan replacement were refined with CorelDraw and via DXF export, I then could make a proper fan frame with my CNC machine. Basic material is POM (Polyoxymethylene), very good for purposes like this.Result: no fan noise at all, nothing. There is plenty of space for the fan to suck air. With you bare hand, you can feel the cooling air coming out of the device grilles on top and bottom. Fantastic.Disadvantage: if the fan should ever fail, there is no chance to hear that. Maybe, this was the reason why RIGOL took such a noisy fan.At the end, I built a dust cover to protect the device when not in use.Enclosed some pictures. Maybe, it is helpful for others. It then would be nice if you reply your thoughts.

author: ahnernoch
author_rank: Newbie
timestamp: March 29, 2025, 11:31:31 am
content: Looks nice. Did you connect it to the original fan header and do you mind sharing your 3D Print files? Thanks

author: NIAA
author_rank: Newbie
timestamp: June 15, 2025, 11:18:39 pm
content: Quote from: ahnernoch on March 29, 2025, 11:31:31 amYes.Quote from: ahnernoch on March 29, 2025, 11:31:31 amYes, I added it here.Sorry for my late reply, but I never thought someone would answer to my posting...
Manual and/or info wanted on Megger MM29 Megohm Meter - Page 1
Forum section: electronics / testgear

author: KirstyA
author_rank: Contributor
timestamp: June 15, 2025, 06:26:05 pm
content: I have just bought a Megohmmeter Megger MM29 off of eBay and would like to service it and calibrate it.Any information anybody has on this unit would be much appreciated.Thanks
Hanmatek DSO 1102/Owon SDS 1102/Peak Tech P1401 Vesa Mount - Page 1
Forum section: electronics / testgear

author: Traceless
author_rank: Frequent Contributor
timestamp: June 09, 2025, 01:23:03 pm
content: Hi everyone,I'd like to attach my secondary Oscilloscope (Hanmatek DSO 1102) to a table monitor arm (standard vesa mount). Problem is that scope is not prepared for a vesa adapter, It is also not that easy to simply drill holes in the back, because the back shell is concave. Since the scope is marketed under different brand names (e.g. OWON/Hanmatek SDS 1102/ Peak Tech P1401 ...) I was wondering if anyone has already (successfully) tried such a modification and can share some experience.

author: rvalente
author_rank: Frequent Contributor
timestamp: June 09, 2025, 04:06:10 pm
content: Hello!1st optionTry to copy the curve design on CAD, make a intermediate block (3D printed or miller) with VESA mount based on M4/M5 nuts. Make the same block with M4 nuts to screw from the back case of the scope to the block.2nd optionYou can make an angle sheet metal bracket (1.2mm thick will do), on the horizontal side seat the scope and secure with velcro or elastic straps, on the vertical side use rivkle nuts with vesa mouting.

author: Traceless
author_rank: Frequent Contributor
timestamp: June 15, 2025, 06:22:59 pm
content: Hi rvalente,thanks for the suggestions. Idea 1 sounds great since I don't own a miller or 3D printer I took a look at 3D printers and found this to be one hell of a rabbit hole. So for now I think option 2 could be the way to go. I might try to do a 2nd 90° bend on both the top and bottom of the bracket so it wraps around the scopes bezel (0.5-1cm overlap) and then glue some high density foam (used for packaging test gear) to line the inside of the bracket front and back (see ASCII sketch below, F would be the foam, "|" and "-" the sheet metal bracket). The idea would be to press fit the scope and have the compacted foam keep it steady.Code:|------------||F F|F|F|F||F F||------------|--Cheers Traceless
IEC P25 Pulse Generator Service Manual - Page 1
Forum section: electronics / testgear

author: stevehurcombe
author_rank: Newbie
timestamp: June 17, 2025, 10:16:36 pm
content: Hi,I'm looking for a service manual for an Interstate (IEC) P20 series (P25) pulse generator. I have found that it became Racal Dana, but nothing under that either.I've tried several of the usual archives.Thanks,Steve

author: Andy Watson
author_rank: Super Contributor
timestamp: June 17, 2025, 11:43:47 pm
content: https://archive.org/download/manualsplus_01054/manualsplus_01054.pdf

author: stevehurcombe
author_rank: Newbie
timestamp: June 18, 2025, 08:13:55 am
content: Thank you Andy, hiding in plain sight.
8593A - Page 1
Forum section: electronics / testgear

author: Martin.M
author_rank: Frequent Contributor
timestamp: June 15, 2025, 06:13:10 am
content: I am in need for a servicemanual for the hp 8593A.This unit was in junk, I have done a lot of repair.PSU was defect, complete recap.battery was empty = newscrenndisplaybox = changedbuffer IC for video sync, U72, 8120 3185 = 74HC14 = changed.videoproblems.following the instruction from a related manual;erased the SRAM.video is now allreadyIt must be feed with all data for the SRAM to be a nice working 8593A.So I need the manual to go the long way.greetingsMartin
Riden WiFi module firmware with Modbus TCP and SCPI support - Page 1
Forum section: electronics / testgear

author: morgendagen
author_rank: Newbie
timestamp: January 21, 2024, 10:11:38 am
content: Hi,Long time lurker, first time poster.Recently I have been working on an alternative firmware for the WiFi module that can be plugged in to Riden's RDxxxx power supplies. Using this software the power supply can be controlled over Modbus TCP as well as SCPI.I have released the source code and compiled firmware as well as installation instructions on GitHub:https://github.com/morgendagen/riden-dongleHopefully this is useful to somebody out there. Should you decide to give it a spin, then please let me know of any issues or feature requests by adding a GitHub issue.Regards,Peder

author: bateau020
author_rank: Frequent Contributor
timestamp: June 11, 2025, 06:52:58 am
content: update: the latest firmware now has an interactive web interface, with graphing.
Probes for PFC + LLC Converter testing - Page 1
Forum section: electronics / testgear

author: slugrustle
author_rank: Frequent Contributor
timestamp: June 15, 2025, 05:44:28 am
content: I'm working on a offline switching power supply that is an active PFC stage followed by an LLC converter, and I'm curious what kind of oscilloscope + probe configuration is typically used for testing this kind of converter. A few options come to mind:If I power the converter from a programmable AC source with floating outputs or an isolation transformer, could I use an ordinary scope with single ended passive probes?Obviously all the probes would have to connect to the same common, likely PFC output DC bus negative.The converter output is isolated and floating, so I could tie it to the same reference point and measure on both sides.Use an ordinary scope with diff probes. I have two Pico TA043 diff probes which look reasonable (10x/100x 70V/700V, 100MHz).The 100x division ratio hurts when looking at smaller signals like feedback networks.I'm betting the CMRR isn't good enough to look at the LLC half bridge high side gate drive or the voltage across the PFC boost diode but would work for most other measurements.I highly doubt the 100MHz bandwidth given the input lead length and sprung hook connectors.Oscilloscope with isolated channels like theCleverscope CS548. This is the most tempting.TheR&S RTH1004also looks good, but it doesn't specify CMRR beyond 100kHz, and the isolation voltage rating derates above 100kHz. I'm not sure whether it could look at high side gate drive signals or not.Similar for theAEMC OX9304 IV, although its datasheet claims 600VRMS isolation out to 500kHz, with voltage derating at higher frequency. That implies good CMRR or at least low isolation capacitance.Optically isolated probes likeTek IsoVuorMicsig SigOFIT.The Micsig starts to approach the price of the cleverscope at multiple channels.The probe tips appear to require MMCX connectors on the board, which is inconvenient.I'm guessing most people use diff probes and call it a day but would like to hear from someone who has done it.
Windows 11 (or Linux) software for the FY6900 DDS Signal Generator - Page 1
Forum section: electronics / testgear

author: NeilH
author_rank: Newbie
timestamp: June 09, 2025, 10:32:56 am
content: Hello,I purchased the FY6900 (20MHz version), then found to my chagrin that the software download links are all dead in the water! I mean ALL of them - every link that I can find. I believe the latest version for Windows is 6.8 (?). If anyone is willing to share their copy with me, please get back so that we can arrange a transfer.P.S. I am aware of third party software on GitHub (an App and a Library), but I don't think either is the vendor's software.Thanks in advance,NeilH

author: coromonadalix
author_rank: Super Contributor
timestamp: June 09, 2025, 09:09:05 pm
content: DO NOT DOUBLE POST you have received some warningand you have the fy6900 thread(s) do check in them they have been posted
have you seen this one ? - Page 1
Forum section: electronics / testgear

author: coromonadalix
author_rank: Super Contributor
timestamp: June 08, 2025, 05:07:39 pm
content: https://www.ebay.com/itm/376307770774?The Prema 8047 must be based or derived from the 8017, maybe having in common, the same BK7 special Prema adcnot sure if it's legit, apparently 7.5 digitstheses pictures where found elsewhere too, i asked the guy to have more recent photos and his name on it, could be a dud, no answers

author: kmoonwalker
author_rank: Frequent Contributor
timestamp: June 08, 2025, 06:12:20 pm
content: too expensive for preowned 7,5 digit in my opinionhttps://docs.ampnuts.ru/eevblog.docs/Prema/8047/Datasheet%20%20Messcomputer%208047.pdf

author: Kosmic
author_rank: Super Contributor
timestamp: June 09, 2025, 01:05:40 am
content: Quote from: kmoonwalker on June 08, 2025, 06:12:20 pmAnd the Prema 7.5 digits meters are not that impressive either. I prefer my HP 34401a to my Prema 5017The only reason i'm keeping the Prema is it's capability to read PT100 sensors directly.
Help needed – EM Test UCS500M positive half-cycle switching delay (PF1 timing) - Page 1
Forum section: electronics / testgear

author: Pauldg1
author_rank: Newbie
timestamp: June 08, 2025, 08:42:13 pm
content: Hi everyone,I’m troubleshooting an issue with an EM Test UCS500M EMC test generator and I could really use your help or insight.🔧 Problem description:When I switch the mains to the DUT using PF1, the output sine wave is not synchronized properly. It consistently switches late on the positive half-cycle, while the negative half-cycle is complete and clean.As a result, during surge testing, the DUT’s input capacitor and or the big y-filter caps charges with a steep dv/dt instead of receiving a smooth sinusoidal ramp. This significantly results in input current stress levels.Here’s attached a scope capture of EUT output voltage🧠 What I’ve tried so far:• Swapped PF1 and PF2 boards → no improvement• Wiggled ribbon cables during test → no effect• Generator worked correctly for a short while, but now the problem is persistent• Sync input is connected (and detected).⸻❓ What I’m looking for:• Has anyone experienced this one-sided half-cycle switching delay before?• Do you know where the zero-cross detection circuit or optocoupler is located inside the UCS500M?• Does anyone have schematics or internal service documentation (input board, microcontroller board)?• Could this be caused by an aging optocoupler or relay driver?Any tips or prior experience would be greatly appreciated. Even rough guidance could help move things forward.Thanks in advance,
Probing under a microscope: the world's smallest oscilloscope screen. - Page 1
Forum section: electronics / testgear

author: Howardlong
author_rank: Super Contributor
timestamp: June 07, 2025, 07:13:53 pm
content: This project has been years in the making, with many false starts and failures.It's a fact of life that probing under a microscope carries with it the overhead of having to continuously look away to look at the scope trace, and it's not unusual for your probe to slip as a you do.Until recently, I was fixated on augmented reality solutions, but a couple of weeks ago I came across some 0.39 inch electronic viewfinder screens typically used for cameras, advertised on AliExpress as "Thermal Night Vision EVF - 0.39 Inch OLED Microdisplay Module with AV/VGA Input (Monocular Design)". The scope I have on the soldering bench is an HP/Agilent/Keysight MSO6104 which has an XGA (1024 x 768) output.If anything these 0.39" displays are a bit too small. Maybe half an inch would be a better compromise.The PPI on these 0.39" displays is 3282ppi, making a typical retina displays pixel density of about 300ppi seem positively backward.

author: kmoonwalker
author_rank: Frequent Contributor
timestamp: June 07, 2025, 07:50:07 pm
content: looks cuteI would suggest changing the screen board to one not having so thick edge between screen and mobo to have more of screen from binoculars (or larger diameter screen) but anyway great job!One would love next step -> to have such solution integrated into some modern scope like Leica Ivesta 3 with integrated camera so you can do those measurements etc just looking throu bino and placing/resizing scope/dmms screen where you need it

author: tv84
author_rank: Super Contributor
timestamp: June 08, 2025, 08:56:46 am
content: Spectacular!
Agilent E8257D CLIP (component level information packet) - Page 1
Forum section: electronics / testgear

author: nexus
author_rank: Regular Contributor
timestamp: September 04, 2021, 07:12:43 pm
content: Hi all,Just picked up some mmwave instruments from a local company that was excessing some inventory. E8257D 40 gig analong signal generator and E4446A 44 gig analyzer.E4446A has suspect input attenuators. Just waiting for some 2.4mm to SMA adapters so I can do some insertion loss tests before going further.E8257D has a self test error: 707. This corresponds to the sweep phase detector (instrument has 007 ramp sweep option). This is traceable to the A6 Frac-N board.While block diagrams are available, wondering if anyone has an Agilent CLIP (component level information packet) that covers this board.The A6 Frac-N has several part #s, E8251- 60328 / 69328 / 60044 / 69044 and is used in a few Agilent synthesizers:E8257DE8663BE8663DE8257CE8247CE8257NWould be helpful if there was component level type info out there. I haven't pulled this board yet but I know package marking can be mysterious and a CLIP would be extremely useful.Plus, planning on doing some signal path style repair vids on these instruments, so stay tuned for that!Cheers,Kevin

author: nexus
author_rank: Regular Contributor
timestamp: September 06, 2021, 02:56:54 am
content: Confirmed that issue is with sweep PLL, likely the phase detector portion of that circuit. Instrument operates just fine in CW mode, but as soon as sweep modulation is enabled, the Sweep PLL throws an unlock error. This is definitely in the A6 frac-N.Just pulled the board tonight and removed pcb from shielding sandwich. Lots of nice mixed signal engineering going on here. Now to figure out where the problem isHigh res pictures:https://drive.google.com/drive/folders/1bfuvlu2nFoTb8uSpvdKbUk0NGnOv90ml?usp=sharing

author: vaualbus
author_rank: Frequent Contributor
timestamp: April 24, 2023, 01:15:11 am
content: Not that this will will help you but if what this agilent document said is correct, CLIP was shipped with the original CD romhttps://keysight-docs.s3-us-west-2.amazonaws.com/keysight-pdfs/E8241A/PSG+Series+Configuration+Guide.pdfThe literature pn is E8251-90032And the CLIP cdrom is E8251-90033Probably they are not where to be found on the web.....

author: vaualbus
author_rank: Frequent Contributor
timestamp: June 08, 2025, 10:41:23 am
content: xDevs has the first confirmation that CLIP are out there. It shows some schematics of the low band output port in one image, so I guess someone has the schematics!https://xdevs.com/fix/psg-a/
Siglent SDS800xHD series - Page 1
Forum section: electronics / testgear

author: Ramben
author_rank: Newbie
timestamp: June 07, 2025, 12:59:05 pm
content: Hello everyoneI am interested in buying a Siglent sds800xhd series oscilloscope in the 4-channel version. My question is - are the 70,100,200 MHz versions the same in terms of hardware? and the difference is in the locked software. Thank you for your explanation.Best regardsArkadiusz

author: Grandchuck
author_rank: Super Contributor
timestamp: June 07, 2025, 02:42:46 pm
content: https://www.eevblog.com/forum/testgear/sds800x-hd-review-demonstration-thread/

author: tautech
author_rank: Super Contributor
timestamp: June 07, 2025, 11:48:44 pm
content: Quote from: Ramben on June 07, 2025, 12:59:05 pmThe answers you seek are in this thread:https://www.eevblog.com/forum/testgear/siglent-sds800x-hd-12-bit-dsos-coming/The 70, 100 and 200 MHz models each come with probes suited to their max BW but that's not to say these probes don't perform higher than their BW rating.

author: Ramben
author_rank: Newbie
timestamp: June 08, 2025, 07:50:26 am
content: Thank you for the information.Regards