hybridfree/eevblog-posts huggingface dataset:
R3767CG service manual - Page 1
Forum section: electronics / testgear

author: Doper
author_rank: Newbie
timestamp: September 06, 2025, 07:34:42 am
content: Hello everyone,Recently I have been looking into Advantest VNAs since they have good prices, but their serviceability is their down point.Does anyone happen to have a service manual for R3767CG ? or a similar model ?Thank you !

author: Kean
author_rank: Unknown
timestamp: September 06, 2025, 09:27:45 am
content: On KO4BB site you will find the R3764_65_66_67 service manual that covers various models including R3767CH (but not G series).https://www.ko4bb.com/getsimple/index.php?id=manuals&dir=Advantest

author: Doper
author_rank: Newbie
timestamp: September 06, 2025, 02:18:16 pm
content: I cant thank you enough !
Siglent SDG 805 buttons nonfunctional - Page 1
Forum section: electronics / testgear

author: FiddleStyx
author_rank: Newbie
timestamp: July 31, 2025, 09:33:53 pm
content: Hello,I've gotten a few of these SDG 805 waveform generators over the years and they haven't had any issues with my intermittent use. But now one of them is having problems with the front panel--buttons do nothing and don't light up. None of the front controls do anything. The screen is fine, though. I've already tried reseating the connectors that go to the front-panel board. I also reached out to Siglent; they gave me some files to put on a USB to recover the device, but it didn't work. The others I bought at the same time as this one are running FW version 1.08.01.12R2 (can't check on the problematic one since the buttons don't work) but the recovery drive requires 1.08.01.13R5 or newer according to the instructions. When the recovery drive is plugged in, the 805 just boots and starts normally.Are there other options for recovering this generator, aside from giving up on it/sending it in for repair? Is there an alternate way to reset the FW or otherwise recover the device? I'm assuming the button issue could be firmware-based.I noticed a microSD slot on the mainboard inside and found a couple mentions of SD card recovery on the internet so maybe that's an option, but I'm not sure how to go about that. Any thoughts?Thanks so much!

author: tautech
author_rank: Super Contributor
timestamp: July 31, 2025, 10:33:45 pm
content: Welcome to the forum.First, get all units updated to at least 1.08.01.15R2 which both supports USB recovery and fixes some startup bugs.You can get all versions here:https://int.siglent.com/download/firmwares/?ProId=21Then go back to your contact at Siglent (NA I presume) and request the SD card recovery package.Come back and tell us how you get on.

author: FiddleStyx
author_rank: Newbie
timestamp: September 03, 2025, 08:53:46 pm
content: SD card recovery package worked and successfully recovered the buttons' functionality! I am very relieved. It took awhile to get ahold of though.Once the buttons were working, updating the firmware using the USB was straightforward. Thank you for your help!
HAMEG HSM1000 firmware - Page 1
Forum section: electronics / testgear

author: harm
author_rank: Contributor
timestamp: May 04, 2024, 08:57:33 am
content: I've HAMEG HMS1000 (1.6GHz) spectrum analyzer with firmware 2.117.I tried Rohde and Schwarz HMS-X latest firmware 2.250 with no luck.My SA needsHMS3000.HFUfile for update, renaming the RS HMS-X.hfu (2.250) did not work.I could update the Help with renamed RS HMS-X.hmg (2.250) file but now my HELP in the SA is lost "No help available!".Hope to find the original HMS1000 or HMS3000 firmware files.Any help?thanks, Harm

author: GHEPARDO
author_rank: Newbie
timestamp: September 04, 2025, 02:01:51 am
content: Hi, if you still need it, I can send you the zipped files. Just tell me how, because I'm new to the forum. Maybe if you email me, I can attach the firmware: HAMEG_FW_HMS10x0_30x0_V02.117Greetings from Naples, Italy

author: EvgenyG
author_rank: Regular Contributor
timestamp: September 04, 2025, 04:24:04 am
content: Try asking guys at Sky Messtechnik. They are super helpful.https://www.sky-messtechnik.de/
Manual for a Soltec VP-6414S X-Y chart recorder - Page 1
Forum section: electronics / testgear

author: Dave92F1
author_rank: Contributor
timestamp: October 19, 2023, 11:10:21 pm
content: I know this is a longshot, but anybody here have a manual for aSoltec model VP-6414S X-Y chart recorder(or similar model)?It's an analog XY recorder (basically a XY pen plotter) from the late 1980s. I picked it up at a ham flea market for $10; it's a neat piece of hardware and seems to be in working condition. but I've got no idea what some of the controls do. And of course schematics would be nice to have.Their website is still up, but none of the phone numbers or email addresses work - seems they were acquired by NEC around 2002 and then...utterly forgotten.https://www.solteccorp.com/6414-x-y-chart-recorder/

author: akhjune
author_rank: Newbie
timestamp: November 29, 2023, 09:46:55 pm
content: Would you like to sell your chart recorder?

author: gbfiore
author_rank: Newbie
timestamp: September 02, 2025, 07:03:10 pm
content: I have the manual of the VP-6415S. It's probably almost the same of the 6414. Do you still need it?
Hioki LR8431-20: Identifying SMD component(Relay?) - Page 1
Forum section: electronics / testgear

author: Martin72
author_rank: Super Contributor
timestamp: March 23, 2024, 11:49:32 pm
content: Hi,This data logger has burnt out components on 2 channels, according to the board designation (RY XXX) I assume that these are SMD relays.The marking code on this suspected relay is W210SB16, a google search turned up nothing, nothing at all.Any ideas ?

author: Kean
author_rank: Unknown
timestamp: March 23, 2024, 11:57:57 pm
content: My guess is they are AQW210S PhotoMOS relays from Panasonic (previously NAiS or Matsushita - thus the M logo)https://www3.panasonic.biz/ac/e_download/control/relay/photomos/catalog/semi_eng_gu2a_aqw21_s.pdf

author: Martin72
author_rank: Super Contributor
timestamp: March 24, 2024, 12:12:24 am
content: Hi Kean,Thanks, will check the datasheet "tomorrow", but that looks very promising.

author: CallMeC
author_rank: Newbie
timestamp: September 03, 2025, 07:40:42 am
content: Hi Martin !I find myself in a similar situation where all the inputs of the logger are fried, did you have any luck fixing your logger ?A quick thermal camera inspection on mine did not raise anything suspicious.Thanks !
Equivalent 'scope probes to Fluke VPS410-ii range (for 19x scopemeters) - Page 1
Forum section: electronics / testgear

author: perdrix
author_rank: Frequent Contributor
timestamp: September 02, 2025, 10:49:28 am
content: These are not exactly "bargain basement"! Are there any equivalent probes around?David

author: Rubo
author_rank: Regular Contributor
timestamp: September 02, 2025, 01:28:30 pm
content: I'm pretty sure it was made by the same company as this:https://www.tme.com/ux/en-us/details/68.9433-28/probes-for-oscilloscopes-and-scopometers/staubli/set-isoprobe-iv-10-1/That's the exact one I have bought for my use with Keysight U1620A

author: Uup
author_rank: Regular Contributor
timestamp: September 02, 2025, 02:04:11 pm
content: RS Components have a similar type.https://au.rs-online.com/web/p/oscilloscope-probes/8251203I bought the 300MHz rated one below, when my Fluke red probe failed for the second time on my 199C.https://au.rs-online.com/web/p/oscilloscope-probes/8251206
New handheld 5ch DSO, Tooltop OS-5C, 1MHz/3MSPS (september 2025)  - Page 1
Forum section: electronics / testgear

author: tunk
author_rank: Super Contributor
timestamp: September 01, 2025, 04:37:56 pm
content: - five channels- 1MHz bandwidth, up to 3MSPS- 4mV/div ~ 4V/div, 1uS/div ~ 4S/div- optional WiFi, with PC data recording- screen 4.3" 480*272- size 150*100*32mm- 2000mAh rechargeable battery- price from around US$55 (non-Wifi, no probes):https://www.aliexpress.com/item/1005009539539512.html- a short video in Spanish:https://youtu.be/2YzjBimL3ow

author: DaneLaw
author_rank: Frequent Contributor
timestamp: September 01, 2025, 05:00:11 pm
content: That's a lot of channels on a 272p 4.3" screen.

author: Aldo22
author_rank: Super Contributor
timestamp: September 01, 2025, 08:31:28 pm
content: Strange device.Only 1.5 to 3msps? My old DSO-TC2 can do that.Only 20Vpp max (1x)?What is that used for?

author: Martin72
author_rank: Super Contributor
timestamp: September 01, 2025, 08:57:44 pm
content: I don't know who buys such toys, but there seems to be a market for them.

author: ptluis
author_rank: Frequent Contributor
timestamp: September 01, 2025, 08:58:59 pm
content: Quote from: Aldo22 on September 01, 2025, 08:31:28 pmThey earn money, we buy another decorative toy
NF ELECTRONICS FV-661 Dual Channel Programmable Filter - request for manual - Page 1
Forum section: electronics / testgear

author: mzj
author_rank: Newbie
timestamp: September 01, 2025, 05:43:33 pm
content: Hello there.Recently I bought a quite exotic programmable filter, NF FV-661. Unfortunately, I cannot find any documentation for it. Google shows only one offer for sale.Maybe someone has a manual/service manual or some experience with this machine? I'm confused about BEF mode and I'm curious if this machine has ability to switch LP into HP filter.
Hung Chang HC4520A schematics and manual needed - Page 1
Forum section: electronics / testgear

author: klimm
author_rank: Contributor
timestamp: September 04, 2025, 10:13:05 am
content: I've got this multimeter from a friend, did not give much attention until I noticed it is a 4.5 digit one. It has a nice Caddock 1776-C611 inside, was not able to see what converter(40 DIP) uses as it is under the LCD, I supose 7129 or 7135. According on date on the ICs could be made in 91. Was able to find another HC, 3.5 digit schematic using ICL7126.On my poorman's 10V reference(AD588BQ) it shows about 33mV less compared to 8840A, so I thought I would search for the responsible trimmer on DC. It has 7 of them...so I didn't dare to test all of them.I searched the internet and was not able to find any info. I know Voltcraft (Conrad) had some of its multimeters produced by Hung Chang maybe there are others having the same design but was not able to find anything.
firmware for R&S - SFU - Page 1
Forum section: electronics / testgear

author: OliverWirthg
author_rank: Contributor
timestamp: January 12, 2024, 05:57:51 pm
content: Hello all, I would need to download the latest firmware for ROHDE SCHWARZ - SFU. I couldn't find the firmware on the original R&S site. Is it possible to get this firmware anywhere?According to my information, it should be version 02.92 from December 2015. Thank you all for the help!

author: Qw3rtzuiop
author_rank: Frequent Contributor
timestamp: January 13, 2024, 12:08:48 pm
content: Here are the links to the firmwarehttps://scdn.rohde-schwarz.com/ur/pws/dl_downloads/dl_firmware/pdf_3/SFU_ReleaseNotes_0292.pdfhttps://scdn.rohde-schwarz.com/ur/pws/dl_downloads/dl_firmware/zip_1/FW_0292_SFU.zip

author: OliverWirthg
author_rank: Contributor
timestamp: January 14, 2024, 03:52:11 pm
content: Thank you very much, I reinstalled the firmware, everything works great! Thanks again!

author: 2m0jzm
author_rank: Newbie
timestamp: September 01, 2025, 03:17:57 pm
content: I can't download this from here does anyone have a copy or know of another location I can download the firmware and release notes from?
Edge Artifacts for DDS and True Arb AWG Squarewave  - Page 1
Forum section: electronics / testgear

author: mawyatt
author_rank: Super Contributor
timestamp: August 31, 2025, 03:31:27 pm
content: While posting on another thread investigating the effects of a limited number of sinewave harmonics to create a squarewave we came across the effects of using the DDS vs True Arb mode for AWG waveform generation.AWG is SDG2000X and SDG6000X, 1VPP with ~30 inch cable 50Ω terminated at DSO (SDS800X HD). You can see the effects of the higher sampling rate (2.4GSa/s vs 1.2GSa/s) and deeper file (32kpts vs 16kpts) of the SDG6000 and the benefits of True Arb vs DDS modes for squarewave creation for both AWGs!Anyway, thought this might be interesting to some folks, maybe also other AWGs?Best
Considering purchase of the PINTECH DP-100 Differential Probe - Page 1
Forum section: electronics / testgear

author: hazzer
author_rank: Regular Contributor
timestamp: August 31, 2025, 09:13:08 am
content: Im considering buying the PINTECH DP-100 Differential Probehttps://www.amazon.co.uk/dp/B07X9VXVZ6I'm not seeing any reviews online for this probeQuestion:Has anyone got one of these probes? is it close to its spec? whats the build quality like?open to suggestions of an alternative?Likes...4 ranges, x100, x200, x500, x10004mm sockets and high impedance at 16Mohms 1.2pf3K5Vdc between inputs and 6K5Vdc to groundPrice - reasonable for the spec100Mhz (50Mhz at x100).... I actually only need about 20MhzDislikes9V plug pack - feels old tech, USB C would have been niceIts quite a large footprint at 20cm longCMRR not spec above 1Mhz ?no customer reviews on amazon listingRegardsHarry

author: tautech
author_rank: Super Contributor
timestamp: August 31, 2025, 09:29:53 am
content: Pintech got their start from following Pintek in Taiwan whose been making differential probes for 20yrs longer.They were known to copy the popular long standing DP-25 and both those probe models are still available.See if you can find a Pintek equivalent.

author: hazzer
author_rank: Regular Contributor
timestamp: August 31, 2025, 10:30:59 am
content: Thanks yes I see what you mean,https://www.pintek.com.tw/productDetail/land-ctop-2/index/pscsn/17072/psn/19267Pintek online sellers are few and far betweenDigiKeys have the Cal Test Electronics which appears to be Pintech models (see the 6K5 isolation to gnd)https://www.digikey.ie/en/products/detail/cal-test-electronics/CT4072/9342240RS offer the GW Instek GDP-100 which from it spec looks to be a Pintech DP100https://ie.rs-online.com/web/p/oscilloscope-probes/2858150HPS the Pintek DP100 says its 9v 300ma while the Pintech DP100 is claiming 9V 35ma... a re design perhaps?be great to find a tear down of the Pintech model

author: adam4521
author_rank: Regular Contributor
timestamp: August 31, 2025, 12:41:54 pm
content: It's sometimes difficult to identify the OEM. For example, RS Pro have an RS-SI 7002, and Farnell have what looks to be the same as TT-SI 7002. Is that a Sapphire design (can't see it on their website)? The Pico TA041 with the yellow bumper is the old SI-9001, which was produced for a long time but I think now discontinued. And then there are also the Micsig probes that are discussed from time to time.You're right to focus on the CMRR. Unless you have a specific high voltage requirement, a probe that offers 10x or 20x range, (like the DP-25), is likely more generally useful than a minimum attenuation range of 100x.
A new (2025/07/08) powersupply from fnirsi - Page 1
Forum section: electronics / testgear

author: RAPo
author_rank: Super Contributor
timestamp: July 08, 2025, 06:11:35 pm
content: See all the detailshere.

author: tunk
author_rank: Super Contributor
timestamp: July 10, 2025, 10:57:11 am
content: To make it searchable, it's called IPS3608. Specs:- 0-36V, 0-8A, 0-285W- no data on ripple- USB-C, PD3.0- USB-A, HUAWEI FCP. HUAWEI SCP, AFC, QC2.0, QC3.0- 2.8-inch color screen- size 138×214×115mm, weight 1539gEdit: Just read the specs a bit more carefully and load regulation is ±(0.2%+2bits).

author: geonicz
author_rank: Contributor
timestamp: August 14, 2025, 03:26:27 pm
content: As a person which had 4 devices from fnirsi, 3 of them dead or faulty right from their store or within a week(scope which showed 3.7v on 5 DC - 1013 maybe model; sag-55 hot air gun with random temperature right from the shop; dead power supply after plugging typeC cable in it dps150) , I'd avoid this company totally.

author: TheDefpom
author_rank: Frequent Contributor
timestamp: August 31, 2025, 05:48:59 am
content: I have been sent one of these and I recorded the review video already.FNIRSI have asked that I delay release of the video until they have more stock on hand, so I will be releasing it on Tuesday next week.I load tested the unit and check for noise, turn on/off voltage spikes etc. etc. You will see all that in the videoI will link it here once it is available.

author: ptluis
author_rank: Frequent Contributor
timestamp: August 31, 2025, 07:17:28 am
content: Quote from: geonicz on August 14, 2025, 03:26:27 pmYeah Fnirsi is a kind of lottary, some are ok, some not, quality check is dubious. My last purchase from them were two spot welders, one is fine work nicely, the other one a complete junk, i sent several email reporting the problem but never got an answer. But one thing is true they do nice card boxes with beautiful images.

author: Fire Doger
author_rank: Regular Contributor
timestamp: August 31, 2025, 11:09:16 am
content: Fnirsi doesn't seem to design anything inhouse. They are some kind of "accelerator" for low cost electronics tools.They probably have a team of product designers and they do the manufacturing, but on the software side is hit or miss, depending on the developer.Eventually they may mature...This is how it was described by DPOS350P & DPOX180H developerhttps://www.eevblog.com/forum/testgear/hello-everyone-i-am-the-developer-of-dpos350p-and-dpox180h/
Aeroflex 7100 Upgrade - Page 1
Forum section: electronics / testgear

author: KD1RX
author_rank: Newbie
timestamp: June 17, 2022, 12:24:34 am
content: So I bought myself one of those Aeroflex 7100s on eBay thinking that it was cheap enough that even if it was a total bust I could at least part it out. Thankfully I didn't have to do that.Step one was booting it as-is and making sure it did what it was advertised to do. It did. It was also totally full of viruses.Step two was pulling the hard drive (conveniently located in an externally-accessible caddy) and replacing it with a new SATA SSD that I had lying around.Step three: install Windows 10 32-bit edition. Went super smoothly, even recognized the touchscreen.Step four: install NI VISA (need 19.5 or earlier as 32 bit operation was dropped after that), Aeroflex PXI Module software and Aeroflex PXI Studio. The Aeroflex software is available on Viavi's website, and it needs to be installed in Windows 7 compatibility mode.Step five: pop the front panel and wire the front panel connectors directly to the PXI instruments. I didn't bother trying to figure out their proprietary switch/combiner matrix. If somebody wants to do that I'd be interested in the result.Step six: profit! Both sources and both receivers appear to work well. In addition, the sources have the 2 GByte sample memory option, which is pretty snazzy.If anyone knows how to buy the generic demodulation key for the 3035C receivers in this, I'd be very interested in that.

author: KD1RX
author_rank: Newbie
timestamp: June 18, 2022, 07:11:29 pm
content: Update: Windows 10 was being a bit wonky and the Aeroflex software was unstable. Downgraded to Windows 7 Professional and everything seems to be much happier.

author: pag
author_rank: Newbie
timestamp: August 31, 2025, 09:13:50 pm
content: Would you happen to know where I can currently download the software for the Aeroflex 7100? I picked one up and want to go "offroad" with it a bit and would like to have a known recovery path. Thanks, Peter KB2VTL
Test leads help needed - Page 1
Forum section: electronics / testgear

author: prolux
author_rank: Newbie
timestamp: August 29, 2025, 09:57:49 pm
content: I had to make a set of leads with very sharp replaceable ends for probing conformal coating reworks, I can get the probe ends but not a probe banana, any ideas?

author: BillyO
author_rank: Super Contributor
timestamp: August 29, 2025, 11:13:00 pm
content: How thick is the conformal coating?You can get nice silicone leaded probes that will pierce about 1 cm for next to nothing.https://www.aliexpress.com/item/1005005638176877.htmlThese are VERY nice probes. The grip on them is also silicone. I have 9 sets of these. I have a set on every meter I use regularly. They measure out at about 50 mΩ per lead. Not too shabby.Yes I know there are better. My premium Keithley probes measure at 26 mΩ, but they cost more than all 9 sets of these probes.

author: slugrustle
author_rank: Frequent Contributor
timestamp: August 30, 2025, 11:18:04 pm
content: Those might be intended to work with modular DMM leads that have a shrouded banana interface. Differential probes also work like this sometimes.

author: prolux
author_rank: Newbie
timestamp: August 31, 2025, 12:47:24 am
content: I can get the female sharp probes, the accuracy is not important (only for sub 10 ohm resistance an .4 to .7 semi testing) Just need a probe with a banana on the end.

author: KungFuJosh
author_rank: Super Contributor
timestamp: August 31, 2025, 01:41:45 am
content: Check out ProbeMaster.com for their probes. They have needle probes, banana connector attachments, etc.
AEMC Power Factor Meter - Page 1
Forum section: electronics / testgear

author: jgrhops
author_rank: Newbie
timestamp: August 30, 2025, 12:36:49 am
content: OK gang, here is today's challenge: looking for any and all available information, ideally a user manual, on the AEMC Model 138.100 Power Factor Meter, a recent ebay purchase. Searches bring no results, even the manufacturer has nothing. Thanks.
Oscilloscope probe adapter 5mm will it fit with OWON ow3100 probe? - Page 1
Forum section: electronics / testgear

author: MethodMan
author_rank: Newbie
timestamp: August 10, 2025, 09:45:02 pm
content: Hi everyone,I would like to purchase an oscilloscope quick probe adapter. I'm wondering if the product on AliExpress is compatible with my probe (OWON ow3100)?The listing on Aliexpress states that the outer diameter is 5 mm, but I measured my probe at ca. 4.8 mm.Therefore, I am not sure if it will fit. Could someone please let me know if it will fit?Oscilloscope Probe Adapter BNC Quick Plug Replacement Accessories 3.8mm /5mm For HF Tektronix For Agilent BNC Adapter Probehttps://de.aliexpress.com/item/4000534543315.html?spm=a2g0o.cart.0.0.406a38dabAne1r&mp=1&pdp_npi=5%40dis%21EUR%21EUR%205.69%21EUR%205.69%21%21EUR%205.69%21%21%21%402103868817548613731331161e78a8%2110000002741262501%21ct%21DE%212570327830%21%211%210&gatewayAdapt=glo2deu

author: shabaz
author_rank: Frequent Contributor
timestamp: August 11, 2025, 12:14:26 am
content: I think it's a long shot to know if someone has tried with those particular probes. You'd have to trailblaze and try it.It's just a simple set of slots on the outer tube that mechanically gently press against the conductor on the probe. There will be a tolerance in the design that will likely handle 0.2 mm. You could gently squeeze the metal if the 0.2 mm is an issue.Although the product page mentions it is for Tek and that it is 5 mm diameter, in fact, a lot of Tek probes have a diameter on that ground conductor of just under 5.0 mm so it's not as if it's a precise 5.0 mm value anyway.

author: Aldo22
author_rank: Super Contributor
timestamp: August 11, 2025, 05:40:37 am
content: I don't know the Owon probes, but the length of the shaft can also matter:https://www.eevblog.com/forum/testgear/looking-for-bnc-adapter-for-siglent-sd1102x-ocillocope-probes/msg5668095/#msg5668095

author: MethodMan
author_rank: Newbie
timestamp: August 12, 2025, 05:25:11 pm
content: Thanks all, I'll give it a try.

author: Phb
author_rank: Contributor
timestamp: August 13, 2025, 06:03:08 am
content: Quote from: MethodMan on August 12, 2025, 05:25:11 pmWould it be too much to ask, to update us/me of your findings? I have been side-lining this as a. I am not really sure b. do I really need it.

author: MethodMan
author_rank: Newbie
timestamp: August 29, 2025, 08:18:57 pm
content: I bought it and it fits perfectly well.
LC Meter : June 2019 Practical Electronics / June 2018 Silicon Chip - Page 1
Forum section: electronics / testgear

author: dazz1
author_rank: Frequent Contributor
timestamp: August 21, 2019, 08:40:20 am
content: HiPractical Electronics and Silicon Chip have published a LC meter featuring wide range and self compensation for drift.Has anyone built one of these? Are they as good as the glossy magazine says?Looks like a quick and easy build.Dazz

author: coromonadalix
author_rank: Super Contributor
timestamp: August 21, 2019, 10:28:47 am
content: Bought the files but never made it, its arduino based and the code need only 3 libraries, can't go wrong for a mere 3$ purchase<EEPROM.h><Wire.h><LiquidCrystal_PCF8574.h>just need to find 1% precision resistors

author: MosherIV
author_rank: Super Contributor
timestamp: August 21, 2019, 07:41:25 pm
content: Try this oneQuoteIt works by putting the L or C in an oscillator, the freq is dependant on the DUT.So by just measuring the freq, you can accurately determine the value.

author: markce
author_rank: Regular Contributor
timestamp: August 21, 2019, 10:17:57 pm
content: QuoteThat's a nice one, but only for smaller (HF) L and C parts.

author: Symeon
author_rank: Newbie
timestamp: August 30, 2025, 03:23:55 pm
content: Hello,anybody involved assembling this instrument??? or more details than those already published???
Measuring mains 220~240VAC transformer - Page 1
Forum section: electronics / testgear

author: JoeyG
author_rank: Regular Contributor
timestamp: August 28, 2025, 10:25:21 am
content: Looking for recommendations - not to blow up my Oscilloscope (which has a earth ground)I looking ideas to measure the 220~240AC mains side and the output 12V AC (load anticipated to be 500mA~1amp)To do some characterization of the transfer characteristic, harmonic content etc.Isolation Transformer?

author: tggzzz
author_rank: Super Contributor
timestamp: August 28, 2025, 10:37:27 am
content: Quote from: JoeyG on August 28, 2025, 10:25:21 amThis is a well known problem with well knownsafesolutions.See the Tektronix references athttps://entertaininghacks.wordpress.com/library-2/scope-probe-reference-material/and paycarefulattention to the paragraph beginning "high voltages: loud noises followed by deathly quiet".BTW, it is true that you can run into the road without looking - and not be killed or injured. Would you listen to someone who told you that?
OLD Phaostron VOMs, VTVMs, models 555, 666, and 777.  I need anual for a 777, ca - Page 1
Forum section: electronics / testgear

author: Early tube era
author_rank: Newbie
timestamp: April 04, 2025, 04:49:11 pm
content: An early post by Enigma-man, saying he had an original manual for the Phaostron 777, and was willing to email it to anyone needing a copy, but he has been inactive for years. Can anyone help? Thank you.

author: HiTechTom
author_rank: Newbie
timestamp: August 27, 2025, 04:26:22 pm
content: I just registered so I could dm him but I guess I am coming to the Phaostron 777 party a bit late. I'll keep scouring the web and if I find something will come back here and report.
Trying to connect tektronix tds210 to pc with rs232 to usb - Page 1
Forum section: electronics / testgear

author: edmaul69
author_rank: Newbie
timestamp: August 17, 2025, 11:53:37 pm
content: So i am using a tested working rs232 to usb adapter to coand trying to get it to connect to my tds2cm adapter in my tektronix tds210 oscilloscope. I am using a female to female adapter that crosses over pins 2 and 3. I st the settings on the oscilloscope and in device manager and the tektronix instrument manager program on windows 11 and i cannot get it to find the oscilloscope. If anyone has any ideas settings or what i can do to get it working i would be much appreciated

author: TERRA Operative
author_rank: Super Contributor
timestamp: August 18, 2025, 03:37:03 am
content: You may find the Tek software only works with a true serial connection, maybe?Did you try without crossing the wires?I've only ever used a true serial port on the PC side, and even then the Tek software can be a bit finicky...

author: TinLethax
author_rank: Regular Contributor
timestamp: August 18, 2025, 06:41:48 am
content: I can confirm that on Windows 11, the Tek OpenChoice is working (TDS1012 with TDS2MEM adapter and the HL-340 USB to RS232). I managed to get it working on the max baud rate (19200 iirc) after several connection attempts. I also found that auto discovery on Tek OpenChoice won't work properly on higher baud rate. Also, can you check that the female adapter is indeed a working Null modem adapter ?edit: Added the USB RS232 that I used.

author: edmaul69
author_rank: Newbie
timestamp: August 27, 2025, 12:19:41 am
content: Its a full null modem adapter that i made myself. I can confirm that in linux terminal/minicom there is communication. I have one of the prolific (i think) rs232 to usb adapters with the clear cord and blue shell which i can confirm from other peoples videos that it works for this oscilloscope.

author: TinLethax
author_rank: Regular Contributor
timestamp: August 27, 2025, 12:49:49 am
content: Could it be that the RS232 pins contact on the TSD2CM module were corrodedGive it some WD40 and few time of plug-unplug.
Anritsu MS2692A teardown (26.5GHz signal analyzer) - Page 1
Forum section: electronics / testgear

author: d-el
author_rank: Regular Contributor
timestamp: August 25, 2025, 04:23:17 pm
content: My vector signal analyzer Anritsu MS2692A:Brief specs:- Windows 7 system- 50Hz-26.5GHz- 125MHz sampling bandwidth- Rubidium reference oscillator- 125MHz-6GHz arbitration vector generator.I decided to open it for a visual inspection and clean off the dust.I will note the excellent build quality. Fast, non-glitchy interface, high-end RF characteristics.I also bought a power meter for it, but it turned out to have a faulty calibration table, more details here:https://www.eevblog.com/forum/repair/anritsu-ma24106a-repair/msg5853977/#msg5853977Under the shield:The device is assembled according to the typical layout for this device. All modules are connected to the motherboard. On the left is a pulse power supply.To the right of the power supply is a computer module (in my case, this is a Core I5 ​​with 8GB RAM).Next, the ADC module is installed, in my case with a 125MHz capture bandwidth.I also have a non-working Anritsu MS2690A and several MS2691A that I serviced and repaired. Therefore, the photos will be combined from all devices.

author: d-el
author_rank: Regular Contributor
timestamp: August 25, 2025, 04:36:11 pm
content: Next, arbitration vector generator module is installed. It has a solid-state discrete output attenuator.Photo of the generator from my other Anritsu MS2690A:Solid-state discrete output attenuator:

author: d-el
author_rank: Regular Contributor
timestamp: August 25, 2025, 04:54:35 pm
content: Next, the synthesizer module is installed, followed by the YIG driver, Input Attenuator, Input filter, Intermediate filter, Frequency converter.Photo of this from my other Anritsu MS2690A.YIG driver:YIG:

author: d-el
author_rank: Regular Contributor
timestamp: August 25, 2025, 04:58:08 pm
content: Photo of this from my other Anritsu MS2690A.Intermediate Frequency filter and input filter (below):Assembly:

author: d-el
author_rank: Regular Contributor
timestamp: August 25, 2025, 05:05:34 pm
content: Photo of this from my other Anritsu MS2690A.Frequency converter, side A:Frequency converter, side B:

author: d-el
author_rank: Regular Contributor
timestamp: August 25, 2025, 05:08:59 pm
content: Photo of this from my other Anritsu MS2690A.Frequency converter, zoomed:

author: d-el
author_rank: Regular Contributor
timestamp: August 25, 2025, 05:14:30 pm
content: Photo of this from my other Anritsu MS2690A.Power Supply, side A:Power Supply, side B:

author: d-el
author_rank: Regular Contributor
timestamp: August 25, 2025, 05:15:42 pm
content: Photo of this from my other Anritsu MS2691A.Input Attenuator:

author: nctnico
author_rank: Super Contributor
timestamp: August 25, 2025, 05:16:06 pm
content: Thanks for sharing!

author: TinLethax
author_rank: Regular Contributor
timestamp: August 26, 2025, 01:51:19 am
content: Thanks for a crisp and clear HD teardown! Always amazed by the RF black magic.

author: rvalente
author_rank: Frequent Contributor
timestamp: August 26, 2025, 11:19:55 am
content: uow, thats the kind o engineering p*rn I like!
Openterface KVM Ext. for uConsole:Our Portable KVM Journey - Page 1
Forum section: electronics / testgear

author: TechxArtisan
author_rank: Newbie
timestamp: August 25, 2025, 07:10:51 am
content: We’ve been geeking out over a fun idea lately. During a brainstorm, someone suggested: “Our Openterface Mini-KVM already controls headless devices over USB. What if we adapt that to a portable microcomputer like the uConsole ?” That sparked lots of whiteboard scribbles and ideas.Our team spent weeks building a KVM Extension module that fits the uConsole’s expansion slot, designed for low-latency control. How it works: keyboard and mouse signals go to the target via CH340/CH9329 chips, the MS2109 chip sends target video to the uConsole as a webcam feed, and a tiny USB hub lets you plug in drives or switch control modes.When we tested the first prototype, the lab went quiet. We plugged in the target, hit power, and the video feed popped up crisp and smooth on the uConsole. High-fives all around; half the battle was won.But then a problem hit: using the uConsole’s keyboard and mouse to control the target did nothing. The cursor stayed frozen, no input registered. We swapped cables, checked connections, reconfigured settings—still no luck. After checking the PCB with a magnifying glass, we guessed the keyboard-mouse module’s circuit was acting up.Next step: revisiting the schematic with fresh eyes. We knew solving this was key, so we asked for help from folks who’ve fixed similar circuit issues. Troubleshooting this would lead us to refine the design for the next version.Got a hunch about the input glitch? Drop a comment. We’ll share how we fixed it in the next update!
A Clean Procedure to Replace the 34401a Display - Page 1
Forum section: electronics / testgear

author: watchmaker
author_rank: Unknown
timestamp: August 24, 2025, 08:05:36 pm
content: I know there have been many threads on this. And I benefitted from them. Thanks.But I found only one YouTube that went thru the entirecorrectdisassembly procedure in detail. Some creators even use a 12 inch screwdrivers to pry things apart and comment "Oh Well" when they break things like the faceplate lock.Below is a video from Ian Johnston who describes the easy, proper procedure for disassembly.My unit had a front bezel capture screw on the power button side that had to be removed. I used bicycle tire levers to ease the faceplate off the chassis. No drama.Rather than struggle with the ribbon cable, I would recommend freeing the display board NOW using the procedure shown in the video. I realized this when reassembling. It makes life much easier. Now lift the faceplate away and start on the display. Ian's advice to first flux the pins makes a lot of sense.I paid $50 for my display from a seller in New Jersey:https://www.ebay.com/itm/275559645229Came in a factory packaged box labeled for the 33401a; not an Agilent part but it was well packed.The pins line up perfectly but you do have to spread the display guard to get the pins under it.Not trying to fool anyone, but because I can be stupid, I painted the two low jacks black epoxy. I thought I had some rigid insulator to add as suggested by others concerned about lack of clearance between two components. Will have to find some. Probably replace the ECs then as well.Put the faceplate in position but loose, insert and lock the display board. Then ease the faceplate back into position. Lock it with the retaining clip you did not break if you paid attention to Ian.

author: coromonadalix
author_rank: Super Contributor
timestamp: August 25, 2025, 12:14:23 am
content: the problem is with theses see the bent pinsthey are larger in footprint than the original, happened to me,you really really need to observe when you slide back the pcb into the front panelyou may or will damadge the vfd glass, it has very tight clearance

author: watchmaker
author_rank: Unknown
timestamp: August 25, 2025, 10:18:17 am
content: Hah. I knew I had some mica windows I used for a watch restoration. One will be perfect. And yes, verify the fit of the repaired VFD board before reassembling for real.
TDS1002 - problems trying to calibrate - Page 1
Forum section: electronics / testgear

author: rjmusto
author_rank: Contributor
timestamp: July 20, 2025, 09:45:06 am
content: Hi All,I have a TDS1002 that I am trying to upgrade to a 1012. I believe it is necessary to run through the factory calibration to get the model change to stick, so have been trying, unsuccessfully, to do that.My problem is it fails on one of the dc input steps - and not always the same one. In fact I got all the way through to step 28 one time, which was frustrating. But every time I try it, one of the steps fail. And there seems to be no option but to start all over again from the beginning.I don't, by the way, have any specialised Tek test gear for this, just a voltage reference and a precision pot. But I have tried to be very careful with the settings at each stage.Has anybody got experience of running this factory calibration and got any tips or hints on how to complete it successfully?Many thanks,Ralph

author: rjmusto
author_rank: Contributor
timestamp: July 23, 2025, 07:40:17 pm
content: After a fair bit of faffing about, I have managed to complete the upgrade for this TDS1002 to a TDS1012. Took quite a bit of effort to get there, and maybe was not worth it in the end, but it might still prove useful to me in the future, and for others I hope, to know how it's done.I've written a short Blog covering the process I went through;https://radioshackrambles.blogspot.com/2025/07/tds1002-upgrade-totds1012.html

author: TinLethax
author_rank: Regular Contributor
timestamp: July 28, 2025, 03:15:27 pm
content: Thanks for the upgrade guide on your blog!Last year I managed to obtain a second hand TDS1012 and TDS2MEM separately from China via taobao. It's my first ever oscilloscope.I believe that the TDS1012 can be upgraded to TDS2012 and maybe even TDS2022. I'm actually working on FPGA conversion board that will convert the 8-bit parallel RGB signal (3 bit per pixel) of the upgraded TDS1000 with the TDS2000 soul back to 4-bit B/W signal (1 bpp) so we can keep using the original monochrome display panel.Sadly my university didn't have wave gen that can go up to 200MHz and now I'm stuck at 100MHz.

author: Joebeazelman
author_rank: Regular Contributor
timestamp: August 23, 2025, 03:46:16 am
content: Shouldn't going from color to B&W be simply a matter of changing a firmware setting? I remember reading it somewhere in a long EEVBlog forum post.

author: TinLethax
author_rank: Regular Contributor
timestamp: August 23, 2025, 04:12:42 am
content: It can be changed with the pitbull hack. But that way requires "Factory calibration" to apply the calibration coeffs to the flash memory. Which requires RF leveled sine gen that can go up to 200MHz. I felt like dumping the flash and modify the coeffs and model ID seems to be a cheaper route for me.
What is the maximum number of colors displayed on the Tektronix TDS 2000 series? - Page 1
Forum section: electronics / testgear

author: Joebeazelman
author_rank: Regular Contributor
timestamp: November 07, 2023, 04:38:52 pm
content: I just picked up a TDS 2024 oscilloscope and overall it's been excellent. However, the number of colors displayed seems limited to around 8-colors at a time. Is this normal? I couldn't find anything online or in the specs. I figure reducing the color depth increases the screen's bandwidth while also decreasing the video memory's size. I gather it's a reasonable tradeoff since plotting waveforms with more than a few colors is superfluous. What's the maximum number of colors the TDS 2000 is capable of?On another note, there's also a TDS 1000C/2000C series which appears to be the same scopes except they're equipped with a color LCD. I assumed the C suffix denoted a color display, but color displays are standard in the 2000 series.

author: TinLethax
author_rank: Regular Contributor
timestamp: October 30, 2024, 07:04:05 am
content: Since I'm currently working on the alternative LCD replacement (FPGA adapter) for the TDS1000/TDS2000 (Non B/C version). I think I can answer your question.It's normal for the TDS2000 series scope to have only 7 (+1 for black) pixel colors. They use display made by Kyocera (part number KCS057QV1AJ to be exact) that wasn't capable of gray-scaling the sub-pixel.

author: Joebeazelman
author_rank: Regular Contributor
timestamp: August 23, 2025, 03:21:01 am
content: Thanks. How's your adapter coming along? I've been looking for an a replacement display for my TDS2024 and discovered the module's metal housing and backlight orientation limits the availability of mountable replacement options. Sadly, the cost of CSTNs and even newer TFTs are increasing in price as the older stock supplies dwindle.

author: TinLethax
author_rank: Regular Contributor
timestamp: August 23, 2025, 03:30:32 am
content: Hi. I haven't work on that project for a while as I've been busy pre-graduation until now that I just started my first job. But I have a plan to revisit this project soon. Actually, I've made a FPGA based conversion board last year and yet to assembly and test it.
RACAL DANA 1998/1999 Frequency Counter Repair - Page 1
Forum section: electronics / testgear

author: 32KCoreStore
author_rank: Newbie
timestamp: August 22, 2025, 03:52:39 pm
content: I have recently acquired 3 x 1998s and 2 x 1999s. All dead. Fortunately, I got one 1999 working by swapping out the (poverty spec) reference oscillator but it has no options at all and is in poor cosmetic condition. I may 'transplant' it into the case of the other 1999 and adopt the options and nicer case.The other units are non functional and I would ask if anyone has any experience in bringing these solid old units back to life?The two I have looked at so far present as:1 All digits light up as "8" but nothing else happens. After a few seconds I can hear a reed relay chatter like crazy. All buttons are dead apart from STBY/CHRG which takes the unit into STBY but doesn't bring it out. PSU voltages are good and the 10MHz oscillator is running OK.2 No display at all, the REM, ADDR and SRQ LEDS flash briefly and the GATE LED stays lit. Again, the only button working is STBY/CHRG which takes the unit into STBY but doesn't bring it out. PSU voltages and oscillator are good.These look like logic problems? Is it worth spending time on these or break for spares? Any help gratefully received. (I do have a full set of manuals/schematics)Thanks, Kevin

author: coromonadalix
author_rank: Super Contributor
timestamp: August 22, 2025, 05:01:15 pm
content: i dont know if they are similar to the 1991 1992, there was problems of broken regulator pins due to physical stress and the way they where put against the frameThe most known problems on them are the stuck keypad switches, they deteriorate over the years, some substitution exist, some defective / blown parts, and sadly you have an unobtanium ic part in themyou could try to find services manuals, they are availableyou can do some search here for the 91 92 98 99 ...

author: Gertjan
author_rank: Frequent Contributor
timestamp: August 22, 2025, 05:37:23 pm
content: Hi 32KCoreStore,Congratulations with these very nice counters. I have a pair, and wrote adriver for TestController. They are still very good performers. But as they are now 35...40 years old, they will need some maintenance / repair...Very common is that the push-button switches go bad. When several switches make contact all the time, the counter will not boot, or do all kind of weird things.So, if the buttons feel mushy, first replace these switches. The correct replacement type isALPS SKEGACA010. Mouser has themin stock.I wrote a posthow to change the switches. It is in Dutch, but all you need are the photos.Original topic on EEVbloghere.Also check the power supplies. After 35 years some electrolytics might be bad.I also experienced once bad contacts with interboard connectors. Just taking the boards apart and put them together again solved the problem.regards & good luck, Gertjan.

author: coromonadalix
author_rank: Super Contributor
timestamp: August 22, 2025, 09:19:39 pm
content: there was a project too for an non expensive ocxo tcxo upgrade, i have them somewhere with the blanck pcb, the clock where around 10$ usd pcb at the time was around 5$ usd
Topshak/Longwei LW-3010EC bench PSU - Page 1
Forum section: electronics / testgear

author: tttonyyy
author_rank: Regular Contributor
timestamp: May 05, 2022, 02:39:48 pm
content: Just a quick mention here because I've had one of these for a while now, it seems to happily carry on doing the job of powering random bits of kit. No problems except that sometimes the on/off switch "sticks" in the on position and needs a flick/wiggle to release it.Recently I needed to script control of it over the USB interface. The supplier has their own dodgy Windows app but I wanted to drive it from python. I couldn't find a python module for it so I created one, here:https://github.com/tttonyyy/lw-3010ec-controllerThought I'd throw it out there because I know at least one other member has one of these PSUs and might also find it handy.

author: ua4yhz
author_rank: Regular Contributor
timestamp: August 23, 2025, 08:37:27 am
content: I also have such a miracleI didn't figure out how to run your script on Python.Can you tell me what the command -turn on- will look like if it is sent to the power supply via the terminal.
Victor 8045mini - Page 1
Forum section: electronics / testgear

author: Aldo22
author_rank: Super Contributor
timestamp: August 21, 2025, 10:10:25 pm
content: Does anyone know this inexpensive littlebenchtop meter?I can hardly find any information about it.Is it new?

author: coromonadalix
author_rank: Super Contributor
timestamp: August 22, 2025, 10:04:03 am
content: could be similar less count than Owon XDM1241, or some shared designssince we know its rebranded under other names like Victor ...i would wait some teardown or tests, may have bugsand i doubt some specsand Victor priced stuff are higher than the original ones ... the Owon xdm1241 who offer 55 k counts is just 20$ more, the victor variant is 40$ more ??i would choose the XDM1241 for a few $ more, and we have a thread here about them

author: Aldo22
author_rank: Super Contributor
timestamp: August 22, 2025, 01:31:37 pm
content: Quote from: coromonadalix on August 22, 2025, 10:04:03 amIt is difficult to make such price comparisons internationally. For the US, absurd "shipping costs" are added to the Item in the link above.For me (Switzerland), the Victor currently costs a total of CHF 56 shipped.The Owon XDM1241 costs CHF 86.69.In Switzerland, customs duties and VAT are added to prices above CHF 63.This means that the Owon costs me CHF 114 in the end. That's twice the price of the Victor.The Owon has more counts, but the same DC accuracy.The Victor has AC up to 10kHz, according to the data sheet, the Owon only 1kHz.I would find that more interesting.But I'm just looking around to see what's available.Actually, my ZT-225 for CHF 30 is better anyway...This is what I came across:

author: coromonadalix
author_rank: Super Contributor
timestamp: August 22, 2025, 02:11:38 pm
content: sure countries fees Vat etc .. play a role heremaybe you'll see in the future some teardown ...
Anritsu ms2667c with hp83752b sync tracking - Page 1
Forum section: electronics / testgear

author: Hg7wgs
author_rank: Newbie
timestamp: August 22, 2025, 08:51:37 am
content: What would be the best solution if I want the sweep - span timing to run synchronously between Anritsu-ms2667c and hp-83752b? I have tried several cabling and settings, but I can't solve it. Does anyone have an idea?