hybridfree/eevblog-posts huggingface dataset:
Proteus Isis simulator from Labcentre - Page 1
Forum section: electronics / general

author: FreeThinker
author_rank: Frequent Contributor
timestamp: September 09, 2010, 05:27:38 pm
content: Has anyone used the Proteus Simulator (Isis) ?What do you think of it? I have used the Demo version only and it's potential seems (to me) to be great.BUT I've found bugs in it's LCD simulation on, to my mind, a fundemental level.I've simulated a known working circuit of a 2x16 line lcd displaying the values of ano to an2 and the display is garbled in Isis but is ok in real life.Working within the limitations of this cripple ware I tried a different approach (as the demo does not allow you to create your own designs) and used sword fish and its Isis plug in which has a couple of development boards in isis format to play with.I have had more success down this route and can now get the LCD to display correctly but it fails miserably when scrolled.Check out my thread on the Labcentre forumhttp://support.labcenter.co.uk/forums/viewtopic.php?f=9&t=3555Am I doing something wrong? Or is the module flawed? any help would be great as I like the product but won't part with my hard earned until I know that it 'Does what it says on the tin' Thanks In Advance.
[PROTEUS] how to simulate a random level sine waveform ? - Page 1
Forum section: electronics / general

author: zanzeoo
author_rank: Contributor
timestamp: December 07, 2015, 06:30:39 am
content: Hi !Does anyone kown how to generate /simulate aRandom level between -10/+10 Vsine waveform on Isis ( Proteus Labcenter) with a 400Hz frequency ?

author: T3sl4co1l
author_rank: Super Contributor
timestamp: December 07, 2015, 12:26:24 pm
content: You'll have to be more specific. What aspect of it is random?If you are asking for anything but a sine wave, it's not a sine wave. By definition. Simulations are mathematical abstractions, so you're working in the domain of math, and definitions matter!Perhaps you mean a modulated sine wave, where the amplitude varies slowly and randomly?Beware that random events aren't generally very useful, especially if they are different each time (inconsistent simulations!). Step or impulse type signals or modulations are more common.Tim

author: rs20
author_rank: Super Contributor
timestamp: December 07, 2015, 01:14:43 pm
content: Not useful, but I wanted to thank you for the sine wave picture -- I laughed so much!
Proteus - EasyHDL NODE Command - Page 1
Forum section: electronics / general

author: hyprfrcv
author_rank: Newbie
timestamp: June 04, 2018, 05:32:14 pm
content: I am still intrigued withLabcenter Electronics,Proteus Professional 8. about theEasyHDLLanguage for Analog models, in particular on how to use theNODECommand.At first i went intoEasyHDL NODECommand, with expressions documented solely in the program help (and in some google site which mainly replicate them in an exact way), like that:NODE V(MyAnalogPin)NODE I(MyAnalogPin)NODE V(MyAnalogPin1,MyAnalogPin2)NODE I(MyAnalogPin1,MyAnalogPin2)NODE VOUT(MyAnalogPin)All them embedded inside a custom"Make a Device", as aText Script:*SCRIPT PROGRAM MYCODE<NODE declarations><expressions>*ENDSCRIPTfor example doing something like:*SCRIPT PROGRAM MYCODENODE V(Out1)Out1=In1*In2*ENDSCRIPTor*SCRIPT GENERATOR MYSIGNAL<NODE declarations><expressions>*ENDSCRIPTThe last case is out of my use, because i am not looking for generators (which are enough documented), but for analog models (with inputs and outputs).None of the written sintaxis worked actually. I didnt find any working sample not any functional tutorial in the whole internet. Hence, i concluded that Proteus simply do not supports theEasyHDL NODEcommands for designing an analog device.Do somebody have a functional example forEasyHDL NODECommands for Analog models?.
NEWBIES PLEASE READ BEFORE POSTING - Page 1
Forum section: electronics / testgear

author: EEVblog
author_rank: Unknown
timestamp: December 28, 2013, 09:58:24 pm
content: This is the leading forum for test equipment reviews and teardowns, and as such, this leads to many new posts like "Which multimeter/oscilloscope should I buy", or "What do you think about model X" etc.It is quite likely that your question has already been answered in some form, or your product already discussed extensively, so please use the Search facility located in the menu system above as a first pass. Don't use the search box top right, it's not as good.Regulars. please be nice to newbies who ask a question that has already been answered, they may have missed this post, or not had any luck with searching.
Vintage Black Star LDO 100 oscillator repair - Page 1
Forum section: electronics / testgear

author: Mike99
author_rank: Frequent Contributor
timestamp: October 15, 2025, 10:24:50 am
content: I've been given this for free to play with. The history is unknown. The display and all the controls function. The output frequency is accurate but the level is way down (about 70mV rms).Opening it up I found two ICs are missing: IC2 (74LS574 flip-flop) and IC3 (27C256 EPROM). The service manual makes no mention of them in the circuit description.I presume the EPROM is programmed at the factory and no longer available?Mike

author: Mike99
author_rank: Frequent Contributor
timestamp: October 15, 2025, 12:50:44 pm
content: Ah, I've just had a closer look at the label on the processor and it appears to show a firmware version number, so I think the ROM is internal.Must have been a design change.Mike

author: Gyro
author_rank: Super Contributor
timestamp: October 15, 2025, 04:48:36 pm
content: Yes, the external address latch and EPROM would have been used before they introduced the mask programmed micro.Iirc, the LDO 100 has a very respectable distortion spec. It was recommended by Pico Technology as a partner signal source for their original ADC216 16bit scope.
Agilent / Keysight 9000a Windows 7 drivers - willing to share? - Page 1
Forum section: electronics / testgear

author: Click_whirr
author_rank: Contributor
timestamp: May 07, 2025, 06:54:55 am
content: Hi guys,I’ve updated a dso9000a to windows 7 (from XP), but can’t get the Acquisition card drivers to work for some reason (says ‘Agilent Infiniium’ file not found, no more clues. Sys and Cat file are present).Does anyone have a 9000 scope on Win7 that would be willing to export a driver I can try please?Mail order beers to you if you can get me unstuck

author: Click_whirr
author_rank: Contributor
timestamp: May 22, 2025, 10:40:09 am
content: Anyone with a 9000 scope running Windows 7?

author: nctnico
author_rank: Super Contributor
timestamp: May 22, 2025, 11:05:14 am
content: Windows Xp drivers won't run on Windows 7. Your best bet is downloading the firmware from Keysight. If there is no Windows 7 version available, then it is highly unlikely there are drivers available.In general is makes very little sense to upgrade test equipment to newer Windows versions as drivers are typically not available.

author: kmoonwalker
author_rank: Frequent Contributor
timestamp: May 22, 2025, 02:25:38 pm
content: Perhaps not an immediate fix but I remember had to fix friends scope years ago and thing is that there are two versions of software for this scope series:Ones running win XP had v4.2:https://www.keysight.com/us/en/lib/software-detail/instrument-firmware-software/infiniium-420-system-software-for-windows-xp-1378162.htmlOnes running win 7 had 4.6:https://www.keysight.com/us/en/lib/software-detail/instrument-firmware-software/infiniium-460-system-software-for-windows-7-2109359.htmlTo make it more complicated there were also two upgrade kits from XP to Win7 depending from SN>or<MY50410100 as you can see on page 27.https://www.keysight.com/se/en/assets/7018-01754/product-fact-sheets/5989-7927.pdfYou may try the win7 setup or you may need to contact keysight in case of specific hardware not covered by that win7 setup...Unfortunately that particular scope was badly damaged by user and scrapped

author: gslick
author_rank: Frequent Contributor
timestamp: May 22, 2025, 10:44:10 pm
content: Maybe the forum user who posted this thread a few years ago still has the software available that might be able to help you:https://www.eevblog.com/forum/testgear/agilentkeysight-infiniium-mso9000-series-motherboard-repairupgrade/

author: kmoonwalker
author_rank: Frequent Contributor
timestamp: May 22, 2025, 11:49:46 pm
content: Quote from: gslick on May 22, 2025, 10:44:10 pmI think he had a never version but it is worth a try - nothing to loose given current condition

author: yoyobob24
author_rank: Contributor
timestamp: September 18, 2025, 12:14:55 am
content: I have a windows 7 image from msox series might work for you if you want?

author: yoyobob24
author_rank: Contributor
timestamp: October 15, 2025, 12:43:37 pm
content: The installer will install it.You need to make sure you have your chipset drivers installed before you start your install of the main program.
Tek TDS3034C battery - Page 1
Forum section: electronics / testgear

author: PwrElectronics
author_rank: Regular Contributor
timestamp: October 14, 2025, 12:36:59 am
content: Earlier this year, I got a salvage TDS3034C that had been dropped. Rear BNC was bent and the ribbon cable inside going to the screen had fallen off. Easy fix. Seemed to work OK.I hadn't used it for a couple months until today. I know I had set the time/date but the clock was off a good month and a half now (behind). Is this a sign the RTC battery is dying? I think this uses one of those Dallas clock chips and the battery cannot be easily replaced? Do I need to do "something" now or risk losing cal settings etc?

author: TinLethax
author_rank: Regular Contributor
timestamp: October 15, 2025, 01:10:37 am
content: I believe that the clock drift is just the typical 32.768kHz drift. It also happened with several units at my workplace (these TDS3014 are 16 years old!).

author: Cyclotron
author_rank: Unknown
timestamp: October 15, 2025, 01:19:05 am
content: Quote from: PwrElectronics on October 14, 2025, 12:36:59 amI pull them and backup the contents. I also tend to grind off the potting and solder on a battery holder to provide longer life. There's images (xray as I recall) on this forum of the inside of the chip to guide any plastic removal. As I recall, you would primarily lose the MAC address and hours on time? There's someone on eBay who sells a solution for the Dallas chip. I can also tell you there's a ton of fakes on eBay. Though I've bought a couple of old ones just to grind off the potting and put my own battery on them.

author: PwrElectronics
author_rank: Regular Contributor
timestamp: October 18, 2025 07:32:50 pm
content: I set the time correctly and 2 days later using the scope again. It would appear that no accumulated time when off has been tallied. Time is 2 days ago.Now, I did have the AC power removed when it was off if that matters. But, it should have kept better time than that if it was xtal drift right?

author: sicco
author_rank: Regular Contributor
timestamp: October 18, 2025 09:01:31 pm
content: The symptoms are a strong hint that the DS1742W internal coin cell battery is dead.

author: Cyclotron
author_rank: Unknown
timestamp: October 18, 2025 09:57:37 pm
content: Quote from: PwrElectronics onYesterdayat 07:32:50 pmIt may be enough to retain some of the memory but not keep time updated. You should back it up ASAP.

author: madao
author_rank: Frequent Contributor
timestamp: «Reply #6 on:Todayat 05:29:14 am »
content: Or: drop damage , xtal of clock is bad.

author: voltsandjolts
author_rank: Unknown
timestamp: «Reply #7 on:Todayat 08:47:48 am »
content: Does the TDS3034Creally have the Dallas DIP RTC with built-in battery? I thought it was a "modern" rehash of the TDS3034B, with usb instead of floppy drive, and I'm surprised if they designed in the Dallas DIP RTC.In other news, there is this;https://www.eevblog.com/forum/testgear/tds3000c-series-bw-sampling-hack/msg5002486/#msg5002486
JoegSmith's Multimeter Transient charts tests - Page 1
Forum section: electronics / testgear

author: FrancoisMarais52
author_rank: Newbie
timestamp: October 14, 2025, 07:31:06 am
content: Hi all, does anyone know if Joe Smith's Multimeter Transient chart is available here, if so please let me knowRegardsFS.Marais

author: Fungus
author_rank: Super Contributor
timestamp: October 14, 2025, 08:40:23 am
content: https://www.eevblog.com/forum/testgear/hear-kitty-kitty-kitty-nope-not-that-kind-of-cat/

author: FrancoisMarais52
author_rank: Newbie
timestamp: October 14, 2025, 01:31:30 pm
content: Thanks bud!!!
Yokogawa DLM2054, options retrofit? - Page 1
Forum section: electronics / testgear

author: Drirr
author_rank: Regular Contributor
timestamp: June 17, 2025, 06:16:14 am
content: Hi,Is there any way to retrofit options for this scope?I tried contacting Yokogawa directly, but since the oscilloscope is no longer supported, they refused to sell any options.ThanksDavid

author: zhongzuocheng520
author_rank: Contributor
timestamp: October 11, 2025, 03:24:56 pm
content: Friend, did you succeed? I opened the oscilloscope's interior and found an SD card containing the oscilloscope's startup program. Later, I used a 4GB SD card to create an identical disk, copied the original SD card system onto it, and was able to boot into the oscilloscope. When I removed the SD card and tried to power on, the oscilloscope wouldn't start and there was no display. This proves that the system is on the SD card, but I don't know how to extract the options.

author: TinLethax
author_rank: Regular Contributor
timestamp: October 15, 2025, 02:08:35 am
content: It would be fun to reverse engineer their software. Can you share the SD Card dump ? Recently, I've been working on unbricking my Tek DPO2014. Got some little fun looking around U-boot, Kernel and Scope app via Ghidra. Would be interested to see Yokogawa software.

author: zhongzuocheng520
author_rank: Contributor
timestamp: October 18, 2025 08:41:48 am
content: Okay, this is a copied system, there are two versions: 3.73 and 5.24. Just replace the memory with the 3.73 version and turn on the machine, it will be the 3.73 system，his is the download link, valid for 7 dayshttps://www.transfernow.net/dl/20251017EFJ4Q7XG

author: TinLethax
author_rank: Regular Contributor
timestamp: October 18, 2025 09:52:25 am
content: Thanks Zhongzuocheng. But It seems that the link is expired or smth.
HP 334A Transistor Substitution and Troubleshooting - Page 1
Forum section: electronics / testgear

author: jdlahmann
author_rank: Newbie
timestamp: October 14, 2025, 12:18:31 am
content: Hello, long time reader - first time poster.I have a HP 334A distortion analyzer that I have been working on getting back up to snuff. The first order of business was to check voltages and then replace the bulbs (both burned out) on A6 and readjust the photo-resistors to the tolerance specified in the service manual.While adjusting the photo-resistors there must have been some sort of ESD or other event that took out Q3 on the A3 board. I pulled it out to test it after following the troubleshooting steps in the service manual and sure enough it was bad.The HP / Keysight manual does not provide much information on Q3 just "Si NPN". I was able to track down the abbreviated HP part number to the following 1854-0354 and cross reference that with the still in production 2N3904. I have no idea what the HP parts original specs were and can not find a datasheet.The closest NPN transistor that I have to the 2n3904 is the 2n4401. As a test I replaced the 1854-0354 with one of my 2n4401 transistors and I was able to adjust the bias and the meter *seems* to be working within specs based on the limited instrumentation I have available. However, is there anything about this substituted part that would make it less than ideal in this location compared to the 2n3904?If so, I would appreciate any guidance or knowledge as to what in this case would make one part a better choice compared to the other.tl;dr HP 334A - can Q3 (HP 1854-0354) on the A3 board be replaced with a 2n4401 without any significant impact on the instruments sensitivity and functionality?EDIT: corrected part number 2n4403 (PNP) to 2n4401 (NPN) to accurately reflect work performed.

author: jdlahmann
author_rank: Newbie
timestamp: October 14, 2025, 02:38:38 am
content: My apologies, and thanks for the catch. I used a 2n4401 in the instrument which is NPN. When I was looking at my parts drawers to write this post I saw 2n4403 right next to it which definitely wouldn't work here! I will edit the original post with the correction.

author: floobydust
author_rank: Super Contributor
timestamp: October 14, 2025, 02:53:20 am
content: Don't worry NPN, PNP they're all the same lol. I also thought the number was not right.Q3 on the A3 board is an emitter-follower inside a feedback loop, so really no special requirements.Any jellybean NPN transistor would be fine there. Even the "bias adjust" trimpot R4 should need no change. I would not worry.HP334A Operating and Service Manual
B&K 8600 Electronic Load --- External Trigger ??? - Page 1
Forum section: electronics / testgear

author: ridgerunnersjw
author_rank: Contributor
timestamp: October 13, 2025, 04:02:13 pm
content: Hello.I have a B&K 8600 wired for external trigger. I am using a 5V TTL signal with period 1 second and low for 100ms (monitored by scope). I am wired according tohttps://www.bkprecision.pl/files/8600_Series_manual.pdf(page 30 listed on document, page 44 according to adobe)I have unit set for CC and the ON/OFF turned on. I used the Shft + Sys button to enter Trigger mode then going to External hitting the Enter button to accept this then Esc ….I never see the unit switch off, it is constantly on….Can someone tell me what I am doing incorrectly?thank you

author: H.O
author_rank: Frequent Contributor
timestamp: October 13, 2025, 07:13:59 pm
content: Hmm, I don't have one but the manual saysQuoteBut I read your post as if you're expecting it to work as a basic remote on/off in CC mode. For that there's the external On/Off control, see page 49 (or 63 according to adobe).Apologies if I misunderstood.
Looking for Information on the Yokogawa DL5180 Oscilloscope - Page 1
Forum section: electronics / testgear

author: Conp
author_rank: Newbie
timestamp: October 13, 2025, 12:04:05 pm
content: I’ve personally searched quite a lot, even in Japanese, but I couldn’t find any additional information, such as a service manual, for this oscilloscope (Yokogawa DL5180) . The only thing I found is a general brochure here:https://www.brltest.com/pdf/pdf_oscilloscopes/2009.pdfIf anyone has more information to share, it would be greatly appreciated.

author: TinLethax
author_rank: Regular Contributor
timestamp: October 14, 2025, 12:39:31 am
content: Hi Conp.Maybe you can contact Yokogawa and ask them for the datasheet and/or user manual. I recently contacted them via web formhttps://tmi.yokogawa.com/us/contact/general-contactfor the Serial Bus analysis user manual of the DL1740. Got some small chat with local sale rep on the phone and then they sent the document to my gmail (yes, they did deal with ordinary people) along with some advertisement of their new DLM series scope.edit : added link to where I requested their support.
Hantek DSO2D20 series - Page 1
Forum section: electronics / testgear

author: Aldo22
author_rank: Super Contributor
timestamp: October 13, 2025, 02:50:44 pm
content: I'm starting a new thread here for the Hantek DSO2D20 series, just so it doesn't get mixed up with the DSO2000 thread.https://hantek.com/products/detail/18233
Keithley 236/237/238 Firmware Revision History? - Page 1
Forum section: electronics / testgear

author: the Chris
author_rank: Regular Contributor
timestamp: October 13, 2025, 08:39:56 am
content: I have never been able to find information about what Keithley changed in the different firmware revisions for their old SMUs. I know that there has been Rev. A03, A06 and A10 and that some have successfully updated their SMU by installing Rev. A10 in the two ROMs that were either EPROMs or EEPROMs, probably depending on the age and hardware revision (e.g. white shields version vs. brown faux-leather shields version).Has anybody insides about what they changed and which benefits are available by updating?Christian

author: Hydron
author_rank: Super Contributor
timestamp: October 13, 2025, 09:16:06 am
content: I'd like to know the same thing, also for other Keithley instruments I have floating around (e.g. 181, 228(A), 617).BTW it's (OTP, no window) PROM vs (windowed, erasable) EPROM - my youngest 236 (with black shields!) from the early 2000s had OTP PROMs with A10 in both spots, my earlier 90s 236 (now 237) had A09 and 238 had A06, both with a EPROM in the smaller capacity location and OTP PROM in the larger one.I upgraded the 238 to A10 using OTP PROM parts, no idea of the difference that has made though someone reported some bugs disappeared on an A06 238 when upgraded to A10 (hence why I did mine). I've got 236(7) A10 FW on a couple of ROMs waiting for the next time I have my A09 unit accessible/open, the PROMs were cheap enough just to do it regardless (and to not bother mucking around with UV to erase and re-use the smaller EPROMs).Edit: I'll dump A09 and put it online after I swap to A10 incase it's useful for some bizarre reason, it doesn't seem to be available on xdevs at least (only A03 and A10).
Anritsu Calibration Tee constants for OSLN50-1 - Page 1
Forum section: electronics / testgear

author: EE-digger
author_rank: Frequent Contributor
timestamp: May 10, 2024, 04:15:34 pm
content: Does anyone have cal constants for this Tee cal kit? They are not usually published because they are built in to Anritsu VNAs.I've measured the delays but want to get the Cx and Lx values right for use to 6GHz. Anyone with a VNA Master or relative may be able to bring up the values, I don't know.Thanks.

author: Roy D. Mercer
author_rank: Contributor
timestamp: October 12, 2025, 04:47:07 pm
content: Quote from: EE-digger on May 10, 2024, 04:15:34 pmDid you ever get these? I have searched and searched. I even used Grok and ChartGPT with no luck. If you will share at least the coefficient values it will be much appreciated.
GW INSTEK APS‑9501 AC power source teardown - Page 1
Forum section: electronics / testgear

author: Zucca
author_rank: Unknown
timestamp: October 12, 2025, 02:22:14 am
content: It was dirty cheap ($276 shipped to my door) on ebay and I pulled the trigger.Does the job, nothing stellar.Does anybody has the service manual with the schematics?Who is good will?

author: Zucca
author_rank: Unknown
timestamp: October 12, 2025, 02:29:57 am
content: if you need to replace the main switch, the screws are underneath the front panel adhesive cover...

author: Zoli
author_rank: Frequent Contributor
timestamp: October 12, 2025, 05:09:07 am
content: Quote from: Zucca on October 12, 2025, 02:22:14 amG(ood)W(ill)Instek.
Tektronix TDS220 - Troubles after upgrading FW from 1.02 to 1.19 - Page 1
Forum section: electronics / testgear

author: gabrielebellini
author_rank: Newbie
timestamp: October 10, 2025, 10:52:01 pm
content: Hello all,I'm asking help after upgrading firmware of my old Tektronix TDS220 from 1.02 to the most updated version available (1.19).Don't know why, but, with the upgraded EPROM chip (got .bin file from here:https://w140.com/tekwiki/wiki/TDS220), the unit starts as a TDS210 instead of TDS220, hence failing the automatic calibration after power on.Googled and found this useful thread where I found a GPIB command (https://www.eevblog.com/forum/testgear/flashing-updated-firmware-to-preproduction-tektronix-tds-210/msg5684129/#msg5684129) for set again model to TDS220 but, at this moment, the only way to complete the procedure is by doing a full factory calibration (https://download.tek.com/manual/071049203.pdf,page 5-1).I don't have such an expensive equipment for doing a factory calibration and I wonder why changing the firmware is forcing to redo a factory calibration.Are there any alternatives to avoid this procedure? Considering the value of such an old device, I don't think it's worth recaibrating the device in a lab.I know I could revert back to the original firmware chip but it would be a defeat...Thank to anyone who can give me some tips.
R&S NGP824 for audio - Page 1
Forum section: electronics / testgear

author: salomonander
author_rank: Regular Contributor
timestamp: October 10, 2025, 07:34:50 pm
content: Hey there,I work in audio repair and i was offered an ngp824 4ch psu for below 2k. In terms of features it would be a great fit. Especially as each channel can deliver up to 64v. Im just a little worried as its a switching supply. Which is advised against in general due to switching noise in the audio world. But im wondering if a unit this high end would have enough adequate filtering to still work? Is there any specs besides ripple, that can give me an indication? At the moment im using a fully linear nga102 which is awesome, but i need more channels. The ngas ripple is below 1mv, the nga824s ripple below 3mv. I dont really see how that would effect real world testing though - in case there is not more to it that im not aware of.

author: KungFuJosh
author_rank: Super Contributor
timestamp: October 10, 2025, 07:44:55 pm
content: That's a good deal if there's nothing wrong with it. Forget the theory, buy it. Try it. If it sucks, sell it for a profit! Otherwise, enjoy.
Infrared remote transmitter ICs in front panel controls of test equipment - Page 1
Forum section: electronics / testgear

author: Scratch.HTF
author_rank: Regular Contributor
timestamp: October 10, 2025, 07:25:08 am
content: Examples I know of are:Philips PM55xx/PM54xx TV pattern generators (SAA3007 - RECS80)Philips PM5193 function generator (SAA3007 - RECS80)Kathrein MFK85 TV/radio signal meter (SDA2208 - biphase)Provided that you can OR the keyboard data line with an infrared receiver module (inverting its output if necessary), infrared remote control functionality can be added e.g. for frequency presetsDo you know of other equipment containing an infrared remote transmitter IC for the front panel controls?
I added MQTT logging to my 121GW via BT/WiFi - Page 1
Forum section: electronics / testgear

author: tjhowse
author_rank: Newbie
timestamp: October 12, 2025, 02:01:30 am
content: Hi all!Apologies if this is the wrong subforum, please feel free to move as required mods.I thought y'all might be interested in my weekend project: Using an ESP32 to read the value from my 121GW and send it to my MQTT broker via Bluetooth and WiFi. This workflow is much better for me compared to logging to microSD cards. The code is an ESPHome config that can straightforwardly be flashed onto most ESP32 variants.The config and some documentation is available here:https://github.com/tjhowse/121gw-esphomeA brief video explainer is here:https://youtu.be/GLtkTARH1eoAt the moment I'm only unpacking the main value, range and sign from the Bluetooth packet. It would be nice to read out the rest of the values, but I haven't felt the need yet. Note that the DMM briefly blanks the display when changing ranges. This results in a value of zero being sent on the MQTT link. All of my testing has been in volts mode, other modes may contain dragons! Please test thoroughly before relying on this for anything important.Cheers,tjhowse.

author: Kean
author_rank: Unknown
timestamp: October 12, 2025, 05:03:29 am
content: Very nice. I must try this sometime.
New clamp meter from Brymen, BM099 - Page 1
Forum section: electronics / testgear

author: Sebaxtian
author_rank: Newbie
timestamp: October 02, 2024, 08:52:46 pm
content: Hello! Has anyone used or just tested the new clamp meter with power quality functions, BM099?https://brymen.eu/shop/bm099/I didn't find any videos on YouTube. It looks like BM089 on steroids.What do you think, is it worth it?

author: J-R
author_rank: Super Contributor
timestamp: October 02, 2024, 10:18:37 pm
content: I see it's listed on Byrmen's site as well:http://www.brymen.com/PD01BM099_099.htmlHas a link to the data sheet (catalog) and user's manual (both under Info Tab).

author: ovi_mv
author_rank: Unknown
timestamp: October 09, 2025, 12:07:38 pm
content: bought a couple of weeks ago, had the chance to use it with single phase and triple phase consumers works very nice 3P 3W. I used it with a 3 hp with and withoutVFD drive. The harmonics feature is very helpful. I realized that the easiest way to use is with magnetic test clips on the voltage measurement (direct attachment, to the RCB screws).Overall opinion after two weeks : very good !
solved: HZ18 4wire LCR-Meter Test Lead: Connector pin assignment wanted - Page 1
Forum section: electronics / testgear

author: Andree Henkel
author_rank: Regular Contributor
timestamp: October 09, 2025, 11:14:17 am
content: I have a HM8018 LCR Meter, but not the accessory "HZ18" Test Lead Cable, which is 4 wire + shield:https://ie.rs-online.com/web/p/lcr-meter-accessories/0388634but it´s no longer available, and I didnt find a used one.Cable has 5Pin DIN Plug, Meter matching DIN socketI´m looking for pin assignment of this connectorI´m thinking of getting:https://ziboo.online/collections/accessories/products/ziboo-zb-l100k-handheld-lcr-test-clip-universal-digital-bridge-kelvin-test-line-smd-chip-use-for-de-5000-lcr-meter, DIN5 shielded Plug and 1+meter of shielded 4W cable and build a HZ18 mockup

author: Andree Henkel
author_rank: Regular Contributor
timestamp: October 09, 2025, 11:22:41 am
content: at the Meter I could derivedrive High side Pindrive Low side Pinif anyone has this probe, he could determine with continuity testerShield pinwhich two pins are high side, which two pins low sidecombining this I could derive complete 5 pin assignment

author: Kean
author_rank: Unknown
timestamp: October 09, 2025, 11:41:35 am
content: Service manual is easily found with a search, and the HZ18 pinout is shown in the schematic on page 11.https://www.sm5cbw.se/hameg/hm80/hm8018-2-serv.pdf
Cheap new Op Amp Tester explanation? - Page 1
Forum section: electronics / testgear

author: tedsorvino
author_rank: Regular Contributor
timestamp: October 08, 2025, 02:08:22 pm
content: Hi everyone. I have a good old op amp tester for single and dual op amps. All simple. If the op amps are good the 2 leds stay lit. If they are bad they blink.I recently bought a new tester that includes quad op amp tester on it.But things are quite more complicated (sophisticated ?) on it. There is an output terminal, there are 2 switches (frequency high low or something), a trimmer and plenty of leds. Apparently there is no manual or easy online explanation on how to work with it and what is what..I’m talking about this thing here:https://www.amazon.com.be/-/en/Operational-Amplifier-Module-Single-Tester/dp/B0DLB4R1YJIs anyone familiar with it and could possibly give me some simple directions (or direct me to an appropriate link) on how to operate it as the simple older one I have, for simple op amp testing (I guess most audio op amps are high speed), And also explain what is the function of the switches, trimmer and output (+-).Thanks in advance

author: thm_w
author_rank: Super Contributor
timestamp: October 09, 2025, 12:17:25 am
content: https://www.aliexpress.com/item/1005009727037743.htmlQuotesimilar to:https://www.elektormagazine.com/news/circuit-op-amp-tester

author: tedsorvino
author_rank: Regular Contributor
timestamp: October 09, 2025, 05:39:15 am
content: Thanks so much for the links. The aliexpress description is not clear imvho (unless you know how to work the board). I will read the other article to see if it’s clearer.
SEEKING GUIDANCE: Multimeter Probes in Australia - Page 1
Forum section: electronics / testgear

author: spudgunn
author_rank: Newbie
timestamp: October 09, 2025, 03:27:35 am
content: Hi all,I have a multimeter with probes that take 2 years and a government grant to perform a beep with continuity testing. I would love a responsive set like Probe Master 8000 series and prepared to pay but the shipping to Oz from the US is almost the same price as the probes themselves. Can anyone very kindly let me know where are some good quality, super conductive probes in Australia?Many thanksMike

author: J-R
author_rank: Super Contributor
timestamp: October 09, 2025, 03:34:56 am
content: https://eevblog.store/products/brymen-bl21s2-t4sc-gold-plated-silicone-test-probes

author: spudgunn
author_rank: Newbie
timestamp: October 09, 2025, 04:34:34 am
content: Bingo!! Thank you. Right under my very nose!
Spectrum Analyzer spike at zero frequency. - Page 1
Forum section: electronics / testgear

author: WA0ZZG
author_rank: Newbie
timestamp: October 08, 2025, 10:44:40 pm
content: Afternoon from Iowa and a small comment abut RF spectrum analyzers.Most RF spectrum analyzers will show a large spike at zero mhz even with no input.This is normal and not a problem. Here’s why.The first mixer will normally up-convert the input to a high microwave frequency. When scanning zero hz, the mixer oscillator injection is calculated as the first IF frequency. Mixer leakage allows some if the mixer injection to leak through to the IF and shows up as the signal.Zero hz can be used as a test signal, although it does not go through the attenuator or preamp.Actually, it’s the aliens.
Agilent Infiniium 9000 momentary power on-off push switch - Page 1
Forum section: electronics / testgear

author: F1GWR
author_rank: Regular Contributor
timestamp: October 11, 2025, 05:01:18 pm
content: This power switch, momentary DPDT (measured an intermittent contact with a continuity tester) is highly suspect to fool the power management circuits and sometimes inhibiting the scope startup.In addition on solder side appears very difficult to remove safely (second picture).Wandered around to find a replacement. Without success.Any idea?
Recommended USB C Power Bank for Rigol DHO8XX/9XX Anyone? - Page 1
Forum section: electronics / testgear

author: scopeman
author_rank: Frequent Contributor
timestamp: October 07, 2025, 03:26:32 pm
content: Hello,Since PrimeDay is here I am considering the purchase of a USB C power bank that will run the DHO8XX/9XX scopes. Does anyone have a proven solution?Attached is a picture of the PS Label. The supply being USB C can output several combinations of voltages. I think I read somewhere that 15V 4A was needed due to the in-rush current (the supply says 15V 3A) but I can't seem to find that link.I also saw a video where a fellow in China designed and made a rather nice add on module but that is a bit of work to accomplish that so I would rather buy something OTS that would work as at this point I have too many projects and too little time!There is also a video where the DHO924 is shown running off of a USB C powerbank for 1.5 Hours and several people have asked about details on the power bank but the poster never replies.I'd like to have something that would run at least that long and perhaps 2hrs or more. I have a 8bit Owon SDS-7102 that runs probably 3-4 hours on battery but having a 12bit scope with that capability would be great.I have looked on Amazon and there are a plethora of units there but with the huge amount of "specmanship" going on you are never sure of what you are getting as the stated output power number is only for marketing..Thank you,SamW3OHM

author: SP3TA
author_rank: Newbie
timestamp: October 07, 2025, 06:02:26 pm
content: Hello,I personally use Baseus 65W (3.25A up to 20V) 20Ah power bank without any problem, don't remember exact PN but I can check it later.

author: scopeman
author_rank: Frequent Contributor
timestamp: October 07, 2025, 06:34:46 pm
content: Thank you for responding.How much run time do you get from it?Sam

author: zelectronicauy
author_rank: Newbie
timestamp: October 07, 2025, 07:13:56 pm
content: Here is a post on that topichttps://www.eevblog.com/forum/testgear/powerbanks-tested-with-dho800900/

author: SP3TA
author_rank: Newbie
timestamp: October 08, 2025, 04:37:20 pm
content: Hello,PN#: Baseus PPADM65-SChecked last night - 1.5h of runtime from 80% (displayed) SoC till power-off.Internal display shows current consumption 2.2-2.3A@15V after DAQ init (and ~1.3A before famous relay clicks) which sums up to 50Wh of energy at output and corroborates specs (74Wh battery, >75% energy conversion efficiency).I will also update with that information thread linked before.
sanwa N-101 - Page 1
Forum section: electronics / testgear

author: Hung
author_rank: Newbie
timestamp: January 16, 2025, 06:34:33 am
content: Does anyone has the document of multimeter Sanwa N-101 . Its reading value V-A and Ohm are lower than true value. Please help me . Thank in advance

author: Dirk Buffel
author_rank: Newbie
timestamp: October 08, 2025, 12:46:53 pm
content: Hello, yes just came across this manual while cleaning up. Still interested ? Manual has the schematic for this multimeter. Best Regards, Dirk
New handheld/desktop DSO+DMM, Fnirsi 2D15P, 100MHz/500MSpS (september 2025) - Page 1
Forum section: electronics / testgear

author: tunk
author_rank: Super Contributor
timestamp: September 05, 2025, 04:02:38 pm
content: Note: Fnirsi doesn't have the best reputation, if youconsider getting this, do your research before buying.First reported by EEVblog user sonpul in this thread:https://www.eevblog.com/forum/testgear/new-oscilloscope-from-fnirsi-dpos350p/msg6029865/#msg6029865- 2ch, 100MHz, 500MSpS- 10mV - 10V/div- 5nS - 50S/div- signal generator, 9 types, sine up to 10MHz- DMM, 20000 count- 4.3" touch screen- size: unknown- rechargeable battery- manual here:https://img.wqdres.com/res/20250821/4a51ce206a934e6e8461de87c3f48838.pdf- a few videos in Chinese here:https://www.douyin.com/search/2d15p

author: TimFox
author_rank: Super Contributor
timestamp: September 05, 2025, 04:07:19 pm
content: Manual link doesn’t work for me.

author: tunk
author_rank: Super Contributor
timestamp: September 05, 2025, 04:22:33 pm
content: The manual link has started working again.

author: ataradov
author_rank: Super Contributor
timestamp: September 05, 2025, 06:13:56 pm
content: Repackaging the old crap design into new case. Who buys that?

author: mishail71
author_rank: Contributor
timestamp: September 07, 2025, 09:27:37 am
content: After purchasing fnirsi® dpos350p and the simply disgusting software of this masterpiece from FNIRSI (the first and only time I buy the product), and the manufacturer's unwillingness to make improvements to their products (firmware), I swore off buying this "God's shit"!!!

author: csuhi17
author_rank: Frequent Contributor
timestamp: September 07, 2025, 01:48:33 pm
content: This turned out pretty disgusting in my opinion.That AUTO and SINGLE button is ridiculous.In one of the linked videos, it looks pretty crappy to me.I don't know how this will be more reliable than its predecessors.

author: tunk
author_rank: Super Contributor
timestamp: September 19, 2025, 11:34:07 am
content: It's now on Fnirsi's downloads page with manual and firmware:https://www.fnirsi.com/pages/manuals-firmwares

author: mishail71
author_rank: Contributor
timestamp: October 08, 2025, 10:12:54 am
content: trouble with this manufacturer FNIRSI//!!!!
Synchronous Demodulation Entirely Within Entry Level DSO? - Page 1
Forum section: electronics / testgear

author: mawyatt
author_rank: Super Contributor
timestamp: October 07, 2025, 10:39:52 pm
content: While posting on another thread about a DSO built-in filter this topic came to mind!! Could one create a Synchronous Demodulator entirely within a DSO? So we set out to see if this is possible with our SDS824X HD.First we needed a source for the signal of interest and the otherSyncsignal require for Synchronous Demodulation. An AWG (SDG2042X) provided theSyncsignal (Sinus of +-1V) at 1MHz on CH2 and the input Sinus signal (corrupted by noise) at 10mv also at 1MHz with FM modulation of 100kHz deviation at 5kHz rate on AWG CH1.Next was the DSO setup. The noise corrupted 10mv 1MHz input signal from the AGG CH1 was connected to DSO CH1 and theSyncat 1MHz from AWG CH2 at +-1 Volt to DSO CH2.DSO F2 was set to Math and multiplied DSO CH1 and CH2, then F3 set to Math LPF of signal from F2 which is the multiplied result of DSO CH1 and CH2. The LPF configuration was set to 100kHz and Adaptive Sample Rate.Here's the results, the Yellow and Magenta traces are CH1 an CH2 respectively, Red/White is F2 and Blue is F3 the LPF Demodulated result. PNG42 shows Squarewave FM Modulation, PNG43 Sinus Modulation and PNG44 Triangle Modulation, PNG46 is 1kHz Ramp ModulationAnyway, we thought this an interesting use of an entry level DSO.Best

author: Kleinstein
author_rank: Super Contributor
timestamp: October 08, 2025, 07:53:46 am
content: One can use some DSOs as a kind of BOXCAR integrator. So average the waveform over many triggers from the sync signal and this way reduce the noise. The averaging part is often offered as some noise reduction mode.The final demodulation could than be done on the averaged data. If there are no rounding errors there is no different between the lockin function (demodulate first and average later) and the boxcar way (average the waveform first and than demodulation).
Visualizing Stepper Motor Characteristics for Qualification - Page 1
Forum section: electronics / testgear

author: Bill
author_rank: Contributor
timestamp: October 06, 2025, 02:06:55 pm
content: Hi everyone,I have a stepper motor that I’d like to study in more depth.My goal is to visualize its main characteristics in order to qualify it properly — for example, its current, speed, torque, and position during operation.I’d like to understand which parameters are the most relevant to measure and how to visualize them effectively (e.g., using graphs).Do you have any recommendations, examples, or measurement setups for analyzing a stepper motor’s behavior in detail?Thanks in advance for your insights!

author: rvalente
author_rank: Frequent Contributor
timestamp: October 06, 2025, 02:18:32 pm
content: Check these and other from clough42...You may use his 'testing method' while capturing more data

author: Bill
author_rank: Contributor
timestamp: October 07, 2025, 07:46:36 am
content: Just to clarify — I’m not planning to test the motor using an oscilloscope like in the video.What I’m mainly trying to figure out is which of the following parameters are essential to determine the reliability and overall quality of the stepper motor:- Current- Voltage- Rotational speed- Torque / Load- Electrical power- Winding resistance (R)- Inductance (L)In other words, which of these are the key indicators that truly help qualify the motor’s performance and reliability?
DC Bench supply, compact, portable and battery powered? - Page 1
Forum section: electronics / testgear

author: sixtimesseven
author_rank: Frequent Contributor
timestamp: November 08, 2019, 11:01:45 pm
content: HiI'm looking for a compact, portable DC "bench" supply to take with me for troubleshooting on site.It should have 1-2 Outputs, ~1V to ~30V, 1-2A out, the usuall CC/CV etc functionality. Internal battery should primarily allow for quick testing and not add too much bulk. External USB / USB-C would be nice too so it could be powered via a laptop / power bank.I have of course seen the chinese RD DP30V5A which can be moded with a battery and a boost converter into a small casing, but I was really wondering if there isn't a finished product out there yet?

author: thm_w
author_rank: Super Contributor
timestamp: November 09, 2019, 12:00:53 am
content: https://www.eevblog.com/forum/testgear/miniware-mdp-xp-digital-power-supply-set/

author: MiniWare
author_rank: Contributor
timestamp: November 12, 2019, 09:27:52 am
content: Maybe MDP-XP is now your only choice (productized)https://www.youtube.com/playlist?list=PLDAP5iOpi-ALEPrbsNvlLjSR9RXcrce_H

author: Magnum
author_rank: Regular Contributor
timestamp: November 19, 2020, 08:13:16 pm
content: Hello,I am also looking for a portable battery powered power supply. 1-2 channels, up 2-3A max., up to 30V.Is there anything else than the MDP-XP available meanwhile?

author: Kean
author_rank: Unknown
timestamp: November 20, 2020, 12:44:02 pm
content: Maybe the FNIRSI DC-6006L:https://www.aliexpress.com/item/1005001530484759.htmlOnly one channel, and no internal battery - but it can be powered off USB C PD.When using PD you'll be limited by max voltage of about 18V as it is buck only no boost. You can get more with a different external source.I've got one on order, as it looks pretty neat. There are reviews on Youtube (in Russian).Annoyingly the link for the manual download isn't working.Edit: Manual and software:http://www.fnirsi.cn/support

author: Magnum
author_rank: Regular Contributor
timestamp: November 22, 2020, 07:00:03 pm
content: Hello,thank you for the info.I haven't found specs for ripple and noise, could you do a measurement when you receive yours?

author: sydundar
author_rank: Contributor
timestamp: October 06, 2025, 09:55:45 pm
content: Hello How about this;A 5-channel, 100 W open-source USB-PD power supply with current limited fixed, adjustable, and waveform-capable outputshttps://www.crowdsupply.com/fusionxvision/benchvolt-pd

author: thm_w
author_rank: Super Contributor
timestamp: October 06, 2025, 10:42:40 pm
content: Quote from: sydundar on October 06, 2025, 09:55:45 pmYou can say "how about my project" to make it clear. There is also no pricing and can't be purchased yet.Better to post here instead:https://www.eevblog.com/forum/crowd-funded-projects/
Connector brand and type of Agilent Digital Probe for Infiniium MSOs - Page 1
Forum section: electronics / testgear

author: F1GWR
author_rank: Regular Contributor
timestamp: October 06, 2025, 10:14:10 am
content: As this digital cable is an unobtainium (or utterly expensive) I planned to build two myself for my two MSOs. What type of 2x20 pins female connector (left end on picture) would perfectly mate the scope digital output?
Wiltron 360B service manual with schematic - Page 1
Forum section: electronics / testgear

author: Xtremexp
author_rank: Regular Contributor
timestamp: October 06, 2025, 01:28:37 am
content: Hello all,I am working in fixing my 360B network analyzer. I do have service manual but it does not include full schematic. Does anyone have or point me where if schematic is available?