hybridfree/eevblog-posts huggingface dataset:
Strange FW Screen freeze bug + Backup Calibration Data on BM257S? - Page 1
Forum section: electronics / testgear

author: ceut
author_rank: Regular Contributor
timestamp: December 25, 2019, 09:43:48 am
content: Hello !I have bought a brand new BM257S I have received after exchange on monday.It is working well except a strange thing : it seems that the screen+bargraph freeze regularly when there's a lot of change on mesurement, it seems that it is something that deal with memory saturation because this one has very fast "crest" and "rec" fonction.Here is a video I made for my retailer (that's why they send me a new one, but it has the same bug):(1Hz with 5Vpp on my JDS6600 from RD official store, 6 times freeze on this video)morpheus.stigmata.free.fr/elec/bug_BM257S_20191219_143203.mp4So for instance I keep it because I found it great, except for 2 things:>can't check big capacitor like 4700µF>diode ouput is only about 1.6V so can't check white and blue led.Strange because I have a AN8008 and an unlocked UT210E with 2 AAA batteries too, and theses one have not these limitations.Another thing:I have my AN8008 and UT210E for about than 2 years now, that I have recalibrated after backing up the two 24C02 from the 2 meters.So I would like to know if someone has already tried to backup the 24C02 of the BM257S ?(I have seen some C_Er topics and I would like to be "protected" from that with reflashing the 24C02)Thanks !

author: ceut
author_rank: Regular Contributor
timestamp: February 22, 2020, 08:32:20 am
content: Brymen has never answer to my questionSo I don't know how their support is...Also, I have recalibrated my BM257S with a U1272A which come from an Laboratory (I have it only a couple of days), and have a independant january 2020 calibration certificate (not from Keysight).I have only calibrate the 3.000V/30.00V (yes, even it is a 6000 points, the internal references are in 3V).Here are the button combination I have found after many tries:- SELECT+HOLD + GO OHMS: screen "000.0"- Select DCV : screen shows "3.000V" (the brymen waits for this 1rst step)- Put a real 3.000V DC source and push SELECT+REL, the DMM shows the internal value of calibration (6.xxx)- For store the new value : SELECT+RANGE- Then Next Step or switch OFF.Now my BM257s is always spot on this calibrated certified U1272A on the 6V/60V ranges.So, after finding the right memory byte for unlocking the 1000A on the UT210E, I give you the answer for BM257s.For U1272A users: do you find this one as a good DMM ?I'm thinking about buying this one, but it's more than 400€ so I prefer asking before..Thanks !
RIGOL DS1052E Connect with PC - I/O setting - Page 1
Forum section: electronics / testgear

author: 2X
author_rank: Frequent Contributor
timestamp: November 29, 2019, 08:51:01 pm
content: Hello, I want to connect the RIGOL DS1052E with the computer. I have on the same PC a generator of SIGLENT (model: SDG 1032X) and some times the generator is recognised from PC and some no... I change the - I/O setting and I set 9600 and GPIB 2 and now the oscilloscope can't connect with the PC and the generator communicates perfect with the PC. Could anyone explains me what is these settings how to set them properly? The PC is a DELL OptiPlex™ GX520 with windows PRO 10 32bit.

author: 2X
author_rank: Frequent Contributor
timestamp: February 20, 2020, 11:47:25 pm
content: Finally I sent the oscilloscope back to RIGOL and they changed tha main PCB.
Multimeter fuse - Page 1
Forum section: electronics / testgear

author: bmdaly
author_rank: Contributor
timestamp: July 13, 2019, 03:06:21 pm
content: Can anyone tell me the difference between this:https://ie.farnell.com/eaton-bussmann-series/dmm-b-44-100/fuse-0-44a-fast-acting-10x35mm/dp/1241957?st=dmm-b(DMM-B-44/100 - Fuse, Industrial / Power, DMM-B Series, 440 mA, 1 kV, 1 kV, 10mm x 35mm, 13/32" x 1-3/8" )and this:https://ie.farnell.com/fluke/943121/fuse-cartridge-440ma-fst-act/dp/546719(943121 - Fuse, Cartridge, Fast Acting, 440 mA, 1 kV, 10mm x 35mm, 13/32" x 1-3/8", FLUKE DMM Series )They both seem to have similar ratings, but 3-fold price difference!

author: Specmaster
author_rank: Super Contributor
timestamp: July 13, 2019, 03:26:11 pm
content: I think its a pricing error and if you can get the Fluke branded fuse at that price it might be worth while getting a few because if you go the UK site for Farnell the Bussman fuse is priced at £11.97 and the Fluke is £12.52 which is around the last price I paid as well. So its a pricing error, in my view.

author: shakalnokturn
author_rank: Super Contributor
timestamp: February 18, 2020, 03:40:43 pm
content: I'm recycling this thread rather than creating a new one to clutter the forum with.I'm looking for a replacement Fluke / Bussmann 10x35 440mA (or 400mA) fuse for my newly acquired Fluke 1587, it feels like replacing the fuse is going to spoil my bargain. (Why the F### do these things cost so much?)The best I've found online so far is here:https://www.distrame.fr/fr/catalog/Fusible-de-rechange-10-x-35-mm-440-mA-1-000-V-IR10kA,171397.html?catalogParam%5BshopId%5D=12695But that's without VAT and I haven't got as far as creating an account to know the cost of postage or whether they will sell to Mr Everybody.Would anyone point me to a cheapish but reliable source four these fuses or similar ones that will fit the safety requirements, preferably in France, will consider Europe.

author: AVGresponding
author_rank: Super Contributor
timestamp: February 18, 2020, 06:15:06 pm
content: 5 euros seems about as low as you're going to find those.The Farnell link seems current, and they definitely will sell to private individuals, though you'll have to make an account (just a case of registering your email etc).The cost is partly because they do have quite high manufacturing standards in order to meet their specifications, and partly because you've little choice...

author: Monkeh
author_rank: Super Contributor
timestamp: February 18, 2020, 09:53:29 pm
content: Quote from: MarkF on February 18, 2020, 09:50:01 pmNot much use for meters using a 10x35mm fuse, now is it?

author: shakalnokturn
author_rank: Super Contributor
timestamp: February 20, 2020, 01:32:45 am
content: While waiting to place an order at Farnell or wherever it will be and considering the meter isn't going to be poking an industrial environment any time soon, I've followed the path of repair / forgery.Do you think this would sell on the usual fake component marketplaces?
What Happened To Eagle RLB Manufacturers? - Page 1
Forum section: electronics / testgear

author: NY2KW
author_rank: Regular Contributor
timestamp: February 18, 2020, 09:06:54 pm
content: Anyone know what happened to Eagle Inc, Sedona, AZ they used to make really excellent quality return loss bridges reasonable priced. Could not find a thing with Google.

author: PrenticeManNY
author_rank: Newbie
timestamp: February 19, 2020, 01:11:38 am
content: Great question, I had a similar situation, where I work we use a lot of Viavi (old Aeroflex brand) test equipment, the accessory kits available through Viavi are Eagle parts, the good news is Eagle still seems to be making parts but as far as I can tell they don't sell through any distributors other than Viavi. I recently smoked a precision 50 ohm load from one of these kits and I wish I could find the direct replacement part but I've noticed the same thing you have.I'd love to find a source for these traditionally reasonably priced precision components outside of ordering accessory kits through Viavi but I pretty much decided they just don't exist outside of the occasional used listings on flea bay.
Hantek HDG2012B no output after NAND recovery - Page 1
Forum section: electronics / testgear

author: valentinc
author_rank: Regular Contributor
timestamp: February 17, 2020, 11:50:53 pm
content: I have a Hantek HDG2012B which sat in storage for a couple of years due to a bootloop caused by a firmware update. It was working fine before the firmware update.I finally got time to recover the NAND flash: did so with a serial interface and sent the u-boot, kernel, recover and rootfs via a USB cable using TQBoardDNW.https://mega.nz/#!UPRyUQIQ!lD66ypvQwegQ5r0BiiG3x_NQSJihvCvMjrnjHySlSQsThese are the files I used (version 1.00.3 with recovery partition).The unit boots fine and all the menus and buttons are working, except there is no output on any of the channels. As can be seen in the photo, the self-test fails at CH1 and CH2 outputs and zoom units. I also mention that I did a preliminary check of all the power supplies and clocks in the unit and they are present. So I believe it to be a software problem, something related to the FPGA not communicating with the analog front-end section.Any advice is welcome.

author: Daruosha
author_rank: Regular Contributor
timestamp: February 18, 2020, 02:56:54 am
content: Have you tried to install the same firmware again?

author: valentinc
author_rank: Regular Contributor
timestamp: February 18, 2020, 05:28:12 am
content: I tried 3 firmwares:- 1 was from Hantek themselves, which won't even boot, was stuck at the Hantek logo- the other 2 are in the archive I put in the link, versions 1.00.1 and 1.00.3, which if I remember right someone posted on this forum.I don't remember exactly what was the version it came with, I believe it was 1.00.1. However, none of the 2 versions generates an output.I attach the serial log as the device boots up.

author: Daruosha
author_rank: Regular Contributor
timestamp: February 18, 2020, 07:42:27 am
content: I know it sounds unnecessary, but check +12/-12V rails after linear regulators.Worst case scenario, i'll take a dump from my own unit and help you to fix it. What's your PCB version?

author: valentinc
author_rank: Regular Contributor
timestamp: February 18, 2020, 07:46:28 am
content: I did check the (+/- 15V in my case) voltage after the linear regulators and they're fine. My PCB version is 1.00.4. I also attached a serial log in the last post. Thank you for your help !
Kikusui PAB 32-3 Power Supply - Page 1
Forum section: electronics / testgear

author: alpuy
author_rank: Newbie
timestamp: February 07, 2020, 08:18:18 pm
content: Hi, i recently acquired a bench power supply of brand Kikusui Pab 32-3:I would like to know your opinion about this power supply, do you think it is any good? Is seems to be a really old power supply.The only problem i found with this power supply is that the ammeter seems to have hysteresis, its not the same going from left to right or from right to left, is it possible to fix this issue?According to the manual the current adjustment goes from 10% to 100% of the rated current but i could go bellow 10% with the knob and measuring with a multimeter, why is it limited by 10%?Thanks

author: alpuy
author_rank: Newbie
timestamp: February 18, 2020, 04:52:46 pm
content: Anyone?Its a bit old but maybe someone can point me out a clue to mod the thing to accept the 0% to 100% current range.
Leader LAG-120B Power Transformer question - Page 1
Forum section: electronics / testgear

author: scrubba
author_rank: Contributor
timestamp: February 18, 2020, 04:20:39 am
content: I am a newbie both to this forum and the electronics world. I need help in converting a Leader LAG-120B audio generator from 220v to 110v. I've consulted Leader, and they have not been able to help me thus far. They sent me a schematic of the power transformer for the LAG-120A which has a different primary tap configuration. It shows 4 taps and a series to parallel conversion. The LAG-120B transformer has 3 taps on the primary. Any helpful information would be appreciated. Thanks.

author: edavid
author_rank: Super Contributor
timestamp: February 18, 2020, 04:46:52 am
content: The manual is here:http://bama.edebris.com/manuals/leader/lag120bIf that doesn't match your unit, post a photo of the transformer wiring.

author: scrubba
author_rank: Contributor
timestamp: February 18, 2020, 09:19:25 am
content: Thank you edavid.The schematic matches my unit, but I am still unsure of which wires to re-route for 120v. Manual states voltage is adjustable from 100v, 120v, 220v, and 240v.I'm not sure, but I think the schematic from the manual shows wiring for 100v.Also attached is a photo of the transformer as presently wired. The person I bought the unit from said it is wired for 220v.Many thanks for your help.

author: TERRA Operative
author_rank: Super Contributor
timestamp: February 18, 2020, 11:15:45 am
content: Looking at it, this is what I would assume the connections to be.(Assuming between #1 and #2 is 100v winding and between #2 and #3 is 15v winding.)I'd expect that the schematic shows 100V connection.If you move the wires from the #2 termimals directly to their respective #3 terminals, you'll get 115V.Connect line to right #1, then right #2 to left #1, and left #2 to neutral and you have 200VConnect line to right #1, then right #3 to left #1, and left #2 to neutral and you have 220VConnect line to right #1, then right #3 to left #1, and left #3 to neutral and you have 240VBest to check on a variac to work out the ratios in each connection though.Or you could just disconnect J6, stick a multimeter in and feed in a low voltage from another transformer with alligator clips for easy connection and a light globe for current limiting, say 12v or 24v, then multiply it out to find the correct combination.Ie, for the correct combination for 120V in, at 12v input, you should get about 2.6V out, for 24V input, 5.2V or thereabouts.
proving box - Page 1
Forum section: electronics / testgear

author: rocky0o
author_rank: Newbie
timestamp: February 17, 2020, 12:27:48 pm
content: In many Joe's Smith clips, he uses a box with various components (resistors, capacitors, diodes ...) to check if the multimeters still function correctlyI'd like some guidance to build such a box for myself, mainly with the best picks for relevant values on the components and how to have in the box both ac and dc output
Fluke 199 lack of waveforms in oscilloscope mode - Page 1
Forum section: electronics / testgear

author: Newmax
author_rank: Newbie
timestamp: September 27, 2017, 03:54:32 pm
content: HelloProblem as in the topic in your Fluke 199c repaired the display according to the film:On the film until 25:45 minutes you can see the lack of waveforms on the display, and then suddenly appear unfortunately I am missing them. The scopometer in multimeter mode works fine in oscilloscope mode, not a stencil. If someone has an idea for repair please help please.Regards

author: azemati
author_rank: Contributor
timestamp: February 16, 2020, 07:20:58 pm
content: HiGood timeI have a handheld Fluke 199 oscilloscope, which unfortunately has a broken second channel and does not display any input signal.I checked it and found that the incoming IC with OQ0260HL Part from Philips was broken.Now I have some questions for you:Is my diagnosis of this IC correct?Where can I order this IC?Could you suggest a replacement for this part?Thank you for guiding me.
Peak ESR60 - Page 1
Forum section: electronics / testgear

author: marc.hickling
author_rank: Contributor
timestamp: February 16, 2020, 08:35:21 pm
content: Hi all I have a peak esr60 esr meter. I also have the peak esr60+ meter which is the new version. If I take the identical capacitor on both meters I get different ESR readings (like significant). Any ideas why? I can only think its something to do with test frequency. I have tried this on multiple meters and multiple caps.Furthermore I wonder if anyone can help me understand why I can have a bad electrolytic capacitor which doesnt read high esr but 100% causes the product to fail. Ive had this a bunch of times - esr meter shows no faults and then recapping the power supply gets it working again...Just curious. thanks!

author: wraper
author_rank: Unknown
timestamp: February 16, 2020, 08:39:19 pm
content: Quote from: marc.hickling on February 16, 2020, 08:35:21 pmDepends on what you mean by "doesnt read high esr". If it's something like 0.3 Ohm for 1000uF cap, it's completely enough to cause issues.QuoteAgain, no info of what you consider as significant. For someone it's 5%, for another 100% difference. Also at what resistance and capacitance value? Give some example.

author: tautech
author_rank: Super Contributor
timestamp: February 16, 2020, 08:41:04 pm
content: You may find some info here and if not Peak's reps and contact details are there:https://www.eevblog.com/forum/buysellwanted/special-offer-to-eevblog-forum-members/

author: Specmaster
author_rank: Super Contributor
timestamp: February 16, 2020, 09:44:35 pm
content: Why a cap could cause product failure even though it passes an ESR test could be as simple as the capacitor is breaking down under the applied voltage in circuit, which can in some cases in the hundreds of volts, whereas that is not the case when using any ESR meter.As to why you are getting conflicting ESR reads with what you describe as significant, I can't hazard a guess. I personally have 3 different ESR meters, but they all agree with each other within 0.1ohms.
FeelTech FY6600 Software Interface - Page 1
Forum section: electronics / testgear

author: SteveJH
author_rank: Newbie
timestamp: February 16, 2020, 04:46:43 pm
content: I have just purchased a FeelTech FY6600 AWG to do some automated testing. My intention was to write a LabView interface so that I can remotely control the FY6600. I have previously written a lot of these interfaces and rarely have a problem getting them to connect. Not so with the FY6600. I know that the driver is working OK as the FY6600 PC software connects and runs. However, entering the commands from RealTerm, Termite or LabView does not get any data back from the unit. I have even used Device Monitoring Studio to sniff the data packets sent by the FY6600 PC Software during startup and normal operation and all the data bytes look sensible according to the documentation. I have tried all the usual things such as different Baud rates, stop bits etc with no luck. Has anyone been able to get the USB interface to work apart from with the stock PC software? Regards Steve
This Multicomp MP720105 Oscilloscope? - Page 1
Forum section: electronics / testgear

author: kazzle101
author_rank: Contributor
timestamp: February 15, 2020, 11:33:58 pm
content: HelloI just ordered a Multicomp MP720105 Oscilloscope from Farnell's, its in my price range and I can't afford/justify a Keysight or Rigol, its to replace my elderly Tenma 72-8710. It appears to have better specifications than others in the same price area, I think that this is because it is a new model.https://uk.farnell.com/multicomp-pro/mp720105/dso-200mhz-1gsps-1-7ns/dp/3228045Multicomp appears to be a Farnell's/CPC/Element 14 own brand made up of re-labeled OEM manufactured goods, and searching for it on Google fails to provide anything useful.Any opinions? Have I made a mistake?Its got a big manual.From the web page:The MP720105 from Multicomp Pro Pro is a 200MHz, 2-channel digital storage oscilloscope, featuring 1GS/s sampling rates, 8-bits vertical resolution, an 8" colour LCD screen, and decoding kit (RS232, SPI, I2C, CAN trigger/decode).- Ultra-thin design, less space accommodation- Multi-interface integration - USB host, USB device, USB port for PictBridge, LAN, AUX- 8" 800x600 high resolution colour LCD screen- 40M record length- 8-bits vertical resolution ADC- Max 75,000 wfms/s waveform refresh rate- Low background noise, vertical sensitivity 1mV/div - 10V/div- Multi-trigger and bus decoding function- SCPI and LabVIEW supported- 1ns/div - 1000 horizontal scale (s/div), step by 1-2-5- DC, AC and GND input coupling- Edge, Video, Pulse, Slope, Runt, Windows, Timeout, Nth Edge, Logic, I2C, SPI, RS232 and CAN trigger types- Auto, normal and single trigger modes- Dimensions (W x H x D) - 340 x 177 x 90mm- Device Weight - 2.6kgThanks.Karl.

author: nctnico
author_rank: Super Contributor
timestamp: February 16, 2020, 12:35:00 am
content: Looks like an Owon which is not the most favorite brand here.

author: egonotto
author_rank: Super Contributor
timestamp: February 16, 2020, 01:11:58 am
content: Hello,it seems to be a Owon XDS3202EBest regardsegonotto

author: kazzle101
author_rank: Contributor
timestamp: February 16, 2020, 01:46:04 pm
content: Thanks.There are only a handful reviews for the Owon XDS3202E, none are enthusiastic. I'll compare it to my Tenma 72-8710 and it's only a little better it can go back.Karl.
Remote control of HP33120A, lessons learned - Page 1
Forum section: electronics / testgear

author: BritishGas
author_rank: Newbie
timestamp: February 16, 2020, 12:27:58 pm
content: Hello everyone,Just a quick post which will hopefully point you in the right direction if you want to control your HP 33120A 15MHz function generator remotely.I am communicating with the instrument via the RS232 interface. In order for this to work you must:1) Use a suitable USB-serial converter. I initially used the UGREEN 20210 converter with a Prolific PL2303 chipset. This claims "automatic" hardware flow control however I was unable to connect to the instrument at all with flow control enabled in device manager. Uploading arb waveform data without the flow control enabled could only take place at very low data rates (<<9600 baud), otherwise the instruments input buffer would overflow. I probed the DTR line at 9600 baud and you could see the instrument desperately asking for the data to stop. A request duly ignored by the converter.Changing to a converter with FTDI chipset made these woes dissapear, the hardware flow control is also "automatic", but it actually works! This is the cable I used:StarTech.com ICUSB2321Fhttps://www.amazon.co.uk/gp/product/B004ZMYTYC/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=12) Use a Null modem cable to swap pins 2/3, 4/6, 7/8. The particular cable I used was:StarTech.com SCNM9FF1MBK 1m Black DB9 RS232 Serial Null Modem Cablehttps://www.amazon.co.uk/gp/product/B00QM8ZP5E/ref=ppx_yo_dt_b_asin_title_o05_s00?ie=UTF8&psc=13) Send data to the instrument. The "Intuilink" arb waveform software is still available for download from the keysight website.:https://www.keysight.com/main/software.jspx?ckey=1000000918%3Aepsg%3Asud&lc=eng&cc=GB&nid=-536902324.536881979&id=1000000918%3Aepsg%3AsudAlthough this remains a useful tool for creating waveforms and exporting as csv, it was unable to see the device over RS232. Instead I wrote a small python script using the pyvisa library (if you don't want to do this, the "Dump file to port" feature of the RealTerm emulator is an easy way of sending csv data to the device).I've attached the python script in case it is useful for others.Let me know if you have any questions.Thanks,Gerry

author: GreyWoolfe
author_rank: Unknown
timestamp: February 16, 2020, 01:18:27 pm
content: I have the same Startech cable. My last 2 company laptops didn't have a serial port and it worked well for the serial devices we had deployed in the field at the time. I don't recall any need to play with settings, it was just plug and play. Now everything is USB but I still have the cable. Never know when I will need it.

author: BritishGas
author_rank: Newbie
timestamp: February 16, 2020, 01:20:33 pm
content: The Startech cable works brilliantly, it was the UGREEN cable with Prolific chipset which was a pain
E3631A or dp-832  which to keep - Page 1
Forum section: electronics / testgear

author: Tracker
author_rank: Regular Contributor
timestamp: February 14, 2020, 07:07:47 pm
content: Folks,If you had to sell one which one would it be?E3631A or DP-832

author: exe
author_rank: Unknown
timestamp: February 15, 2020, 12:41:29 pm
content: Disclaimer: I don't have either of them, nor I have hands-on experience. So, all these are only hand-waiving.E3631A looks to me like a dinosaur: it has a single display showing only one channel and only two parameters (compare that to rigol). It also doesn't seem to be a reliable unit, I've seen quite a few repair videos, and broken units on ebay. Some traces on pcb are too thin and can develop a crack (like the one that drives power mosfet gate). It's also believed to be over-engineered for what it does. VFD display is often dim on units I saw on ebay, and brightness often non-uniform. Current is also only 1A on two main channels, and channels are not isolated. It doesn't have a usb or an ethernet ports.So, I'd sell E3631A.
BM235 US Amazon or EEVblog Store? An Optimization Beast Decision - Page 1
Forum section: electronics / testgear

author: JonM
author_rank: Unknown
timestamp: February 15, 2020, 12:40:18 am
content: On Monday night I decided that I needed another BM235. I could have gotten it on Wednesday from Amazon for US$125 with free Prime shipping. Checking the EEVblog Store I saw that the BM235 was 'on sale' and that I could get the BM235 plus Dave's multimeter fuse set for AU$184.38 including the AU$29.38 shipping charge. A straight currency conversion had that at about US$124. The actual PayPal charge was $129.03.It's now Friday in Eastern Virginia and I'm holding a new BM235! So, for only a day or two delay I effectively got the fuse set for $5. A nice deal and presumably Dave made a bit more (or did he lose because of the sale price?). A delivery to the US West coast might have arrived a day earlier.I gave my first EEVblog BM235 to my son and this one will live at my daughter's house with the primary duty of setting the voltage and frequency on her new diesel generator. I was a bit surprised to find that the generator has knobs to adjust the voltage and frequency with analog current, voltage, and frequency meters. It does have a digital 'Available kVA' display.
Krohn-Hite 1000 Manual / Schematics - Page 1
Forum section: electronics / testgear

author: GerryR
author_rank: Frequent Contributor
timestamp: February 14, 2020, 11:41:40 pm
content: I'm looking for a manual or schematic for the 1000, not the 1000A, which I already have. Just the schematic will do as I was told they are different, and I would like to compare circuits. Any help will be appreciated.
Are Voltcraft Oscilloscopes any good? Can not find any tests for the DSO-6104F - Page 1
Forum section: electronics / testgear

author: jusaca
author_rank: Unknown
timestamp: February 14, 2020, 08:32:24 am
content: I want to by a new 4ch scope for our lab and were looking around.The Voltcraft DSO-6104F seems to be quite interesting for the price point, especially because we can use it with a battery to avoid mains connection during our measurements (we often see noise in sensitive biopotential measurements when the scope is connected to mains).But unfortunatly I can not find a lot of information or tests about that scope, it seems like there are no tests at all out there about it. Does voltcraft built the scopes themself? Are the scopes typically decent quality for the price point? It makes me uncomfortable that they seem to be not very popular.A high quality alternative would probably be the Keysight DSOX1204G, but that is double the price and has no battery option. I guess we would additionally need a differential probe then. This brings this to a price region where we really would have to fight with the bossCan anybody give some details / experiences to the voltcraft scope? Is it a reasonable choice? Is the software usable? Does anybody know if serial decoding is done in HW or SW?Or will we regret to go the cheap way with voltcraft?

author: pantelei4
author_rank: Regular Contributor
timestamp: February 14, 2020, 09:08:18 am
content: https://owontechnology.eu/owon-xds3064e-60mhz-4ch-oscilloscope.html

author: jusaca
author_rank: Unknown
timestamp: February 14, 2020, 10:19:59 am
content: Ohh it's a Owon. Just watched a review from Dave, the usability is aweful! Ok, I guess you can see what you get for your money

author: Wuerstchenhund
author_rank: Super Contributor
timestamp: February 14, 2020, 10:57:25 am
content: Quote from: jusaca on February 14, 2020, 08:32:24 amVotlcraft does not make *any* of the test kit it sells. Voltcraft is a trade brand of Conrad Electronik, which just buys cheap stuff and puts its label on.I'd not touch anything they make for business use.QuoteBottom of the barrel scopes aren't really something I know a lot of but from my own experience I can recommend the Rigol DS1054z:https://www.batronix.com/shop/oscilloscopes/Rigol-DS1054Z.htmlI bought one just because I was curious what less than $400 buys you as a scope, so I wasn't expecting much as long as it would show wiggly lines. But to my surprise, the scope is really good, very good build quality, and because it's been on the market the firmware is now mature and stable. If you removed the Rigol label then it could easily go through as a big brand scope.It can be a bit slow sometimes but for the price it's outstanding value.

author: Fungus
author_rank: Super Contributor
timestamp: February 14, 2020, 12:46:08 pm
content: If you "Can not find any tests" then that tells you a lot, ie. nobody considers them worth buying.
Range switch connections in ANENG AN8001 / Richmeters RM101 - Page 1
Forum section: electronics / testgear

author: Oxmstr
author_rank: Contributor
timestamp: February 13, 2020, 02:26:46 pm
content: I "hacked" my RM101 by adding a range switch (there are connections for it on the other side of the board), but when I was opening the case, my range switch connectors fell off, and now I have no idea where the metal springs should be on the plastic carrier. If someone has the same meter and 5 minutes of time to disassemble it I would be grateful. I tried looking for videos featuring the meter, but they only show the back side.

author: GeorgeOfTheJungle
author_rank: Super Contributor
timestamp: February 13, 2020, 03:25:55 pm
content: This is an 8002:https://youtu.be/QBho9XD7VPQ?t=316

author: GeorgeOfTheJungle
author_rank: Super Contributor
timestamp: February 13, 2020, 03:55:48 pm
content: The 8001:

author: Oxmstr
author_rank: Contributor
timestamp: February 14, 2020, 07:30:18 am
content: Thank you, I would not have been looking for a tuning fork video to see someone disassemble their meter.I'm not sure if that's normal but when switching from ohms to Hz, the mV range shows up in between, same when going from Hz to 10A and from 10A to 60mA.Probably isn't normal as the ohm range doesn't work, maybe the 8001 and RM101 aren't the exactly same layout.I've changed the contacts to 001111 011100 (when switch is on the off left position) instead of 000111 111100 and now it works, but there are more switchovers in between.

author: GeorgeOfTheJungle
author_rank: Super Contributor
timestamp: February 14, 2020, 08:32:20 am
content: Quote from: Oxmstr on February 14, 2020, 07:30:18 amJoe Smith is "Mr Testers"I suspect he kind of likes these Anengs.QuoteYep, same here. But you've got to move the dial very slowly to leave it in between. BTW,mine shows ˚C between A and mA! (but I put the thermocouple and it doesn't work).QuoteVery unlikely, but IDK for sure. Just in case:QuoteOh, sorry, I forgot to say, the photo was taken in the left OFF position.
current clamp ETCR008  Range AC 0.0mA ～ 30A  10Hz ～ 100kHz frequency response - Page 1
Forum section: electronics / testgear

author: Dip_Switch
author_rank: Newbie
timestamp: February 13, 2020, 08:59:22 pm
content: Hi eevblog.Last year I discovered an unknown chinese current clamp ETCR008.Range AC 0.0mA ～ 30AResolution AC 0.01mAFrequency characteristics: 10Hz ～ 100kHzI liked the frequency characteristics: 10Hz ～ 100kHz from the data sheet soI ordered one and made an impedance/phase plot from 10Hz-200khz using my 14bit swiss army knife analog discovery 1.The first resonance frequency appears around 4.8Khz which is a bit too low for me for oscilloscope usage.ETCR008Range AC 0.0mA ～ 30AResolution AC 0.01mAAccuracy class 0.5% FS (50Hz / 60Hz; 23 ℃ ± 2 ℃)Turn ratio 2500: 1 (choose 2000: 1; 1000: 1)Line voltage AC 600V line testCurrent frequency 45Hz ～ 60Hz (measured current frequency)Frequency characteristics: 10Hz ～ 100kHzInsulation strength AC3700V / rms (between core and case)Phase error ≤2 ° (50Hz / 60Hz; 23 ℃ ± 2 ℃)Reference loadRL: 0 ～ 300mA≤500Ω; 0 ～ 3A≤50Ω; 0 ～ 30A≤5Ωhttps://item.taobao.com/item.htm?id=580782994199So maybe save your money if you intend to use it on higher frequencies.My first post here? Could be.Greetings.Dip_Switch
Is UltraDMM project died? - Page 1
Forum section: electronics / testgear

author: 001
author_rank: Super Contributor
timestamp: December 20, 2018, 08:18:08 am
content: HiNo any news for last 5 Yearshttp://www.ultradmm.com/History.aspxWhy?

author: Specmaster
author_rank: Super Contributor
timestamp: December 20, 2018, 01:38:05 pm
content: Quote from: 001 on December 20, 2018, 08:18:08 amWell you could deduce from that, that it's as good as dead

author: 001
author_rank: Super Contributor
timestamp: December 20, 2018, 02:10:48 pm
content: Quote from: Specmaster on December 20, 2018, 01:38:05 pmSorry for my englishWhat is for " it's as good as dead"?Is it mean that project was poor?Or is You say that project is still perfect?

author: bitwelder
author_rank: Super Contributor
timestamp: December 20, 2018, 03:10:10 pm
content: Well, at least the 'whois' utility says that the domain ultradmm.com has been updated on 2018-08-30T10:30:20Z, so probably its owner has still some interest in it (or perhaps the domain has been sold to somebody else).I guess you have already tried to contact them via the form?

author: GeoffreyF
author_rank: Regular Contributor
timestamp: December 20, 2018, 03:14:52 pm
content: Quote from: 001 on December 20, 2018, 02:10:48 pmIt's no better than something so long without life that nobody cares about it. It's forgotten. Pointless, not even smelling anymore, it's so long ago since it died. Thanks for asking.

author: macboy
author_rank: Super Contributor
timestamp: December 20, 2018, 05:11:13 pm
content: Anyone else notice the noise level go up in the forums recently? Maybe a bunch of pointless topics started by a particular user? No, it's just me? Ok

author: Gyro
author_rank: Super Contributor
timestamp: December 20, 2018, 05:30:03 pm
content: Sigrok seems to support a huge number of meters these days. I've not looked into what it does with them though (I only know it for LA support).https://sigrok.org/wiki/Supported_hardware#Multimeters

author: Mr. Scram
author_rank: Super Contributor
timestamp: December 20, 2018, 05:59:15 pm
content: Quote from: bitwelder on December 20, 2018, 03:10:10 pmPayment is often automatic on web services, so taking the website down may be more deliberate than keeping it up. That being said, it's very possible the owner deliberately keeps the domain and the website up for archival purposes or because he thinks he may one day do something with it again. We all have those projects we don't want to give up, but are effectively already dead.

author: joeqsmith
author_rank: Super Contributor
timestamp: December 20, 2018, 06:09:20 pm
content: Quote from: 001 on December 20, 2018, 08:18:08 amPerhaps they picked up and arduino evaluation board for $50 with a student version of LabVIEW. Does it really matter why?

author: BThunderW
author_rank: Regular Contributor
timestamp: February 13, 2020, 09:56:24 am
content: Sorry to resurrect an old thread. Been away a while, life got in the way. UltraDMM isn't dead just yet, I enjoyed working on it so I'm going to support it a bit longer while I work on a successor.
Rigol DP832 USB Remote Control - Page 1
Forum section: electronics / testgear

author: NF6X
author_rank: Unknown
timestamp: February 12, 2020, 12:00:28 am
content: Have any of y'all used USB remote control successfully with a Rigol DP832 (or related) power supply? I've never gotten it to work with any of the few DP832 supplies I have access to. I previously tried (and gave up, and used Ethernet instead) a couple years ago under a previous firmware revision, and I've just started looking into USB control again with both a brand new DP832 and an older one which I've just upgraded to the current firmware release (digital version :00.01.16.00.02, analog version :02.02.04.02.02.04, boot version :01.09).I would like to usepython-usbtmcfor instrument control. I can talk to a Rigol DM3058 with it, but any attempts to use it with a Rigol DP832 result in timeouts under macOS, Linux, or Linux in a VM on a macOS host. I've also tried to use Rigol's Ultra Power software in Windows 7 in a VM on a macOS host, and it just seems to hang while trying to connect to the device.I don't know a lot about debugging USB protocol yet, but I've tried fumbling around with monitoring the DP832 with a Total Phase Beagle USB 480 Power analyzer. When I connect the DP832, I see "Invalid PID sequence" errors in the setup transactions. After the Set Configuration transaction, I see an endless stream of identical OUT transfers involving endpoint 1, which appears to be configured as an interrupt IN endpoint. I don't see such blathering on the bus when I monitor the DM3058.I am wondering whether there may be any known issues with USB control of the DP832, either in general or when it's connected to either Linux or macOS hosts. It's not yet clear to me whether the power supply's USB device interface just doesn't work, or if it's having trouble with the specific computers, operating systems and libraries I'm trying to use it with. All of my successful and unsuccessful attempts at remote instrument control using open-source libraries have given me the impression that it's all a house of cards.

author: JDubU
author_rank: Frequent Contributor
timestamp: February 12, 2020, 03:12:46 pm
content: I have no problem using SCPI commands via the USB device port of my DP832 in Windows 10.

author: NF6X
author_rank: Unknown
timestamp: February 12, 2020, 03:54:39 pm
content: Maybe it just doesn't play well with macOS and/or Linux? I'll try to find a Win10 machine (not a VM) to test it with. But if that's the case, I'll just have to use ethernet.

author: NF6X
author_rank: Unknown
timestamp: February 12, 2020, 08:00:17 pm
content: Ah, so it's not just me. It really is a house of cards.Thank you for the link.It's good that I've upgraded the firmware to 1.16, then. I seem to recall having trouble with general flakiness the last time I was doing automated testing with my Rigol gear, but it has been long enough that I don't remember if I was having trouble with the specific issues identified in that thread.
RIGOL DSA815TG firmware upgrade - Page 1
Forum section: electronics / testgear

author: Robbydot
author_rank: Newbie
timestamp: December 04, 2015, 04:05:40 am
content: Hi Group,Apologies in advance as I know this subject has been greatly discussed in the past ..... I have researched the threads and I am after some confirmation regarding the bootloader versus firmware issue for the DSA815TG.I have an older Rigol DSA815TG ( built around 11/1/2013 ) with the 00.01.02 version of the boot loader.At the moment I am running 00.01.07 version of the firmware which I upgraded early last year from version 00.01.05.Main board version is 00.04Digital board FPGA is 00.05All options installed as well.From what I have read I should be able to upgrade to the new 00.01.15 firmware without losing any of the options ? The problem I believe is if the bootloader is version 00.01.04 or later, this is what causes issues...Am I correct ? I would hate to lose the options for a few gains in the operation,Thanks for your help everyone, any thoughts would be appreciated,Cheers,Rob.

author: gm0otb
author_rank: Contributor
timestamp: December 05, 2015, 12:56:19 pm
content: Hi Rob,From my understanding from reading the threads you will not lose any of your installed options by upgrading to the new firmware.Ray.

author: Robbydot
author_rank: Newbie
timestamp: December 08, 2015, 01:27:39 am
content: Cheers, Thanks very much Ray :-)

author: Robbydot
author_rank: Newbie
timestamp: January 17, 2016, 11:13:43 pm
content: Hello again everyone,Just for some information I got the firmware up to ver 14 without problems.. Ver 15 made the speccy throw an "I.F." error so I rolled back to 14 and everything seems to be working fine,Cheers Everyone,Rob.

author: felix70
author_rank: Newbie
timestamp: February 12, 2020, 09:10:22 am
content: Good morning I am Silvio Iafolla I have in my possession a rigol dsa815tg analyzer purchased from you a few years ago if possible I would like the updated 00.01.17 filmware as on the official rigol site I find only 00.01.19 that supports a main board 00.05 mine has the main board 00.04. I would like to try disabled functions such as swr etc. could you send me a copy of the filmware or tell me where I can download them? Waiting for your reply distinctly greeting Silvio Iafolla I pessato at 01.01.17 but if you give me some advice I would be very grateful because I never did thanks

author: tv84
author_rank: Super Contributor
timestamp: February 12, 2020, 09:44:53 am
content: See here:https://www.eevblog.com/forum/testgear/spectrum-analyzer-rigol-dsa815/msg2912256/#msg2912256
Some guy posts his version of Mr. Carlson's LV Capacitor tester Ultra version... - Page 1
Forum section: electronics / testgear

author: notfaded1
author_rank: Frequent Contributor
timestamp: February 11, 2020, 07:24:15 pm
content: Here's the video:I think this was built from Mr. Calsons design and updated with modern electronics... the video shows his schematic so maybe it has some hints on how the original one really worked? Mr. Carlson himself said this to the builder:Just fantastic work Yannick! Two thumbs up!Perhaps this might help? Or maybe this is settled already?

author: notfaded1
author_rank: Frequent Contributor
timestamp: February 11, 2020, 07:25:35 pm
content: I just noticed he covered up some of the schematic... ugh!

author: notfaded1
author_rank: Frequent Contributor
timestamp: February 11, 2020, 07:30:08 pm
content: Some guys build of the original.

author: WastelandTek
author_rank: Frequent Contributor
timestamp: February 11, 2020, 07:39:28 pm
content: It is only $2 to join Paul's Patreon and get legitimate access to his IP man.

author: chris_leyson
author_rank: Super Contributor
timestamp: February 11, 2020, 08:14:29 pm
content: I would rather build the dangerous high voltage version and use an EM84 instead of the original tube. Bright blue flash, oops, there goes another one. Only kidding. But while you're at it why not build a grid dip meter and/or Wein bridge oscillator at the same time. There is a school of thought that says that low voltage leakage testing of high voltage caps isn't really valid because leakage current could be a function of voltage etc. If you're going to repair tube equipment it's not too much of a step to build your own test gear. Just saying.

author: floobydust
author_rank: Super Contributor
timestamp: February 11, 2020, 09:01:51 pm
content: We already discussed the LV tester until the thread degraded into personal attacks due to flux fumeshttps://www.eevblog.com/forum/testgear/mr-carlsons-lv-capacitor-leakage-tester!-it's-finally-out!/Mr. Carlson does make some test gear that's extremely sensitive. You have to know how and when to use it. I feel that capacitor leakage current is not entirely a figure of merit, especially at this low test voltage. If I was working around paper and bumblebee capacitors on tube gear, I would use the old Heathkit tube cap testers up to 600VDC, Silicon Chip 2010 design went to 100V and another to 600V. Pass/fail LED and how many uA would you use?But why add an Arduino/LCD and stuff without the tester knowing what size the cap is?
Hello everyone, can anyone provide Agilent X4000A firmware version 7.20.20171025 - Page 1
Forum section: electronics / testgear

author: myhobo
author_rank: Regular Contributor
timestamp: February 11, 2020, 11:02:09 am
content: Hello everyone, can anyone provide Agilent MSOX4000A firmware version 7.20.20171025

author: TheSteve
author_rank: Unknown
timestamp: February 11, 2020, 05:31:20 pm
content: There is no need to spam the forum with 4 posts in a row asking for the same thing. I have no 4000 series firmware, only 3000t.
Schlumberger Stabilock 4032 - Page 1
Forum section: electronics / testgear

author: PRO2WAY
author_rank: Newbie
timestamp: February 18, 2019, 11:39:27 am
content: We have a couple of Stabilock 4032 test sets in our workshop.One has developed a peculiar fault, whereby it's off frequency on both the TX test and signal generator to the same value, which varies from 5 Khz at lower frequencies, 16.5 KHZ at VHF 160 Mhz and 43 KHZ at UHF 450 Mhz.Before we start delving into the service manual, has anyone got any idea has to why this should suddenly occur.We have swapped the AF Detector/10 Mhz reference card with the other unit and the fault is identical.Any help would be most appreciated.

author: Astralix
author_rank: Regular Contributor
timestamp: February 24, 2020, 08:00:08 pm
content: This is probably a dead end, but for others that may encounter that problem it might help if I add my 5 cents:The main LO is 433,82MHz generated by a PLL around a 433,82MHz SAW oscillator. This is located on a plug-in PCB on the Output Unit on the RF bus. This oscillator is known to fail. Exchange the SAW crystal by a Siemens branded one or any more modern brand. Exchange the electrolytics by Panasonic and there is another modification needed to the PCB by a solder bridge. Leave me a note if you're interested.CU
HP8711A Unable to boot 3.54 Firmware - Page 1
Forum section: electronics / testgear

author: remap128
author_rank: Newbie
timestamp: February 03, 2020, 09:04:35 pm
content: Hello guys,I have just finished a hardware restoration of an vintage HP8711A network analyzer.My target was to convert it to a 8712 to enable the vector features. I tried to update the FW to 3.54 version. But after firmware install from floppy, analyzer fails some self-test during the bootup, and stops with error message"UNEXPECTED EXCEPTION VECTOR W/ OFFSET 002C"SR = 0700PC = 4017FFF0After returning to FW rev 2.10, everything works fine, but i suggest that I would be unable to enable the vector features (using bootrom mod) with this FW.Can anybody help me, please?

author: rfdes
author_rank: Regular Contributor
timestamp: February 06, 2020, 01:30:03 am
content: If I remember correctly, you need to add more dynamic ram in order to use this version of firmware.

author: scopeman
author_rank: Frequent Contributor
timestamp: February 08, 2020, 04:01:46 am
content: Been there. Tried that.If it is an early 8711A 2.10 may be the highest FW that the instrument can run. I had one of those.Unfortunately the units with the older CPU won't support the Vector options. I sold mine and bought a HP8713C which I updated to a HP8714C as it had a LAN interface as well.Does the CPU board have 31 pin SIMM's? If so it is an older CPU card. Also it is very picky about the type of SIMM's that work on the motherboard. IIRC the older CPU board used a 16 pin DIP for the GAL that is used to enable IBASIC as well. The newer card uses the larger 020 flash parts as well. The older unit uses 010 flash.Even without the vector capability the HP8711A is still a nice instrument.Also before you tried the update from 2.10 to 3.54 I hope that you backed up and then restored the cal constants. IIRC I think it warns the user about that but it has been 5 years or so since I had a HP8711ASamW3OHMP.S. you can find full documentation on the HP8711A including the CLIP (I scanned mine and donated it to Keysight for placement on their site.)

author: picburner
author_rank: Frequent Contributor
timestamp: February 11, 2020, 01:34:34 pm
content: Some old 8711A mainboards refuse to work with highest FW also because of the jumper in the DSP section which does not use all the SRAM.The one highlighted in the pic is in the correct position.
HP 8165 board needed - Page 1
Forum section: electronics / testgear

author: Wallace Gasiewicz
author_rank: Super Contributor
timestamp: February 10, 2020, 06:24:05 pm
content: Before I go and order a bunch of DIPs and repair this board, I was wondering if anyone had a spare board that they could be persuaded to part with.HP 8165 Board A9, AY Reference Loop 08165- 66509I bought two 8165 units as junkers and have one working fine. The other one works fine if the A9 boards are switched. The badA9 board has problems with the 10 KHz circuit, and both PLL loops. Needs lots of DIP replacement..Wally KC9INK