hybridfree/eevblog-posts huggingface dataset:
New Korad PSUs Plus(+) Series - Page 1
Forum section: electronics / testgear

author: 0xFFF0
author_rank: Regular Contributor
timestamp: June 02, 2021, 11:37:45 am
content: There are new Korad PSUs with green and red 7-segment digits and LEDs out now. Is it new? Never seen before. Costs 10 bucks more than the red only ones.https://www.welectron.com/media/image/product/13182/lg/korad-ka3005p-labornetzteil-schraubklemmen_1.jpghttps://www.welectron.com/Korad_1

author: tooki
author_rank: Super Contributor
timestamp: June 02, 2021, 12:04:48 pm
content: The change to the display color happened a while ago, it’s been discussed here before. No change to features or model numbers IIRC.

author: ebastler
author_rank: Super Contributor
timestamp: June 05, 2021, 05:53:09 pm
content: I received one of the updated units in April and have reported the changes here:https://www.eevblog.com/forum/testgear/korad-ka3005p-power-supply-ui-changes/msg3547524/#msg3547524Besides the cosmetic changes, the LOCK LED and the "persistent adjustment mode" both seem to be new, and are impovements to the UI in my opinion. Annoyingly they did not change the way the memory function works: Any changes you make to the voltage and current settings will immediately change the preset which is currently active.Edit: Hmm, so Welectron have now used this opportunity to increase the price... When I ordered and (eventually) received mine, they had not listed this as a new model. So I received my green/red version as a nice surprise, and for €99.
JDS2800 signal generator software can't recognize the COM - Page 1
Forum section: electronics / testgear

author: JulIkk
author_rank: Newbie
timestamp: June 04, 2021, 07:59:10 am
content: Hello,For a research project on MRI scan, we are using a JDS2800 signal generator. We need to create arbitrary functions. However, with my windows 10, I don't detect any COM. With the windows XP it works. I'm sure it is just a setting on my computer but I can't find it. Any one could help me ?
PANASONIC VP-8254A Service Manual  - Page 1
Forum section: electronics / testgear

author: kawal
author_rank: Frequent Contributor
timestamp: June 03, 2021, 01:43:18 pm
content: Bought a new toy and need to fix it.Looking for Service manual for a PANASONIC VP-8254A or closeThanks in advanceInstruction manual would be nice too.

author: rvalente
author_rank: Frequent Contributor
timestamp: June 03, 2021, 09:07:17 pm
content: Quote from: kawal on June 03, 2021, 01:43:18 pmDid you try asking them or artekmedia?These guys, maybe https://y-d.co.jp/url]

author: tautech
author_rank: Super Contributor
timestamp: June 03, 2021, 09:24:13 pm
content: Quote from: kawal on June 03, 2021, 01:43:18 pmBig resource of manual repositories here:https://www.eevblog.com/forum/repair/repair-documents-and-links-sticky-me-please-mods/Check reply #2 for the complete list.
Marconi/IFR/Aeroflex CPM20&CPM46 - Page 1
Forum section: electronics / testgear

author: romal76
author_rank: Contributor
timestamp: April 22, 2021, 05:58:28 pm
content: Hi All!Looking for operation manual and maintenance(service) manual for CPM 20, 46 Counter Power Meter

author: romal76
author_rank: Contributor
timestamp: June 03, 2021, 10:27:53 am
content: still looking for marconi/ifr Service manual P/N 46880/084
JBC DD-1B Temp Sensor? - Page 1
Forum section: electronics / testgear

author: imzack
author_rank: Newbie
timestamp: September 25, 2020, 09:37:09 am
content: I have a JBC Soldering Iron (DD-1B) and its giving me a Error 11 "Error Sensor Temperature Transformer"https://www.jbctools.com/dd-1b-2-tools-control-unit-product-157.html#https://www.jbctools.com/pdf/Errors_list.pdfI have taken the device apart, and can't for the life of me, find the temp sensor.I saw this post: (Reply 26)https://www.eevblog.com/forum/testgear/240v-120vmagic-smoke-jbc-edition/25/Where is sounds like the sensor is on the transformer (LM335?); but I have taken it apart, and can't see any IC's there either.Does anyone know what board its on? (Only two boards on the unit)Thanks!

author: dungo
author_rank: Newbie
timestamp: June 03, 2021, 04:04:21 am
content: the transformer carries a PTC (thermistor) inside the secondary winding. In order to see it, you must remove the plastic that covers the windings. If you don't have a replacement thermistor, just put a 2.2k resistor in its place. it will work but it will no longer do the protection function. lucky
Dowty RFL-829M - Page 1
Forum section: electronics / testgear

author: EngelenH
author_rank: Newbie
timestamp: June 02, 2021, 05:59:28 pm
content: Hi,is there by any chance anyone that has one of these? Recently got one, it turns on, draws a little too much current and hardly any of the output is working (except ohms). So trying to fix it.What I am mainly interested in is finding pictures of the plugin cards (it has everything on a bus like system with expansion cards as it were). Most of all the 2-1100V card. This one has several relays on it. Odd thing is most of them do not seem to have any top cover/cap. So many in fact that I wonder if that is normal.Any help greatly appreciated.Cheers,Hans
Electronic load with pulsating dc - Page 1
Forum section: electronics / testgear

author: Grandchuck
author_rank: Super Contributor
timestamp: June 02, 2021, 03:16:29 pm
content: I tested an 18V, 1A power brick that contains a transformer and bridge rectifier using an MP710259 electronic load. The Eload was set to 0.5 A and the waveform is shown below. Next pictured is the waveform with a resistor load. Next, back to the Eload with a 47 uF parallel capacitor added. Finally, the Eload was increased to 1 A.The combination of oscilloscope and Eload is sometimes illuminating.

author: nctnico
author_rank: Super Contributor
timestamp: June 02, 2021, 04:38:26 pm
content: DC loads with a control loop aren't good for pulsating waveforms. For this purpose I have constructed a purely resistive load which has a whole bunch of resistors (with different values) which can be switch on or off creating a wide variety of resistances. Another option is to use a open-loop load which is connected to the collectors of high power transistors (not MOSFETs!). Unfortunately I wrecked that load and have no rebuilt it so far.

author: Grandchuck
author_rank: Super Contributor
timestamp: June 02, 2021, 05:51:20 pm
content: Yes, here is a different Eload (Tekpower 3710A) at 0.5A and no filter capacitor.
Rigol DL3021A current failing to load consistently in battery mode.  - Page 1
Forum section: electronics / testgear

author: hilltop77
author_rank: Newbie
timestamp: April 09, 2019, 01:51:59 pm
content: Anyone else have an issue when in battery mode the current will not load. I set the current to 1 amp and when pressing the load on off button it is a crap shoot if it will actually load the device. When it fails to load it does load slightly, and it is always .0159 ma. Sometimes it works and sometimes it doesn't. It seems to load consistently in regular CC mode so I don't think there is a fault with the hardware as far as I can tell. It is brand new and running the latest firmware 1.04. Any one that has one of theses can you please let me know if this happens on your unit.ThanksKevin

author: hilltop77
author_rank: Newbie
timestamp: April 10, 2019, 07:59:31 pm
content: I spoke with Rigol. They can repeat the issue as well at their facility. It is a bug in the Firmware 1.0.4. Hopefully they will fix this asap. I rolled back to 1.02 and it seems ok now but missing out on the newer updates.

author: stewart.nz
author_rank: Newbie
timestamp: May 31, 2021, 10:23:35 am
content: Hi, same problem with 1.05, there is meant to be a patch coming out soon, v1.05.01,Check out this video for my work around...https://photos.app.goo.gl/Db1wLAYaVni9TiMi7regardsStewartZL4DC

author: electr_peter
author_rank: Unknown
timestamp: June 02, 2021, 05:25:46 pm
content: Tested Rigol DL3021A unit with 12.5V 2A DC supply and 1.1 A load current in battery app mode. ON/OFF gives either 1.1 A or 0.0149 A load current - result is random, more times gives correct 1.1 A value. Incorrect load is always the same, 0.0149 A. Final load current is stable, but 0.0149 A goes back to full 1.1 A if current setting is changed by minimal increment as shown in @stewart.nz's video above.Not sure why that happens, did not check in more detail with scope.It is clearly a bug and needs fixing.SW ver. 00.01.05; FPGA ver. 01.02; boot ver. 01.011
Free Bandwidth Upgrade for Rigol MSO/DS402X - Page 1
Forum section: electronics / testgear

author: dflycon1
author_rank: Newbie
timestamp: June 02, 2021, 04:02:07 pm
content: Hi Everyone!We had these four codes (attached) for the now discontinued Rigol Oscilloscopes MSO/DS402X series. We thought someone here could take advantage, or send them to those that could.Rigol Part Number : RIGOLBW2T3-MSO/DS4000Description : Bandwidth upgrade from 200MHz to 350MHz for MSO/DS402XThey're only good for one scope, so make sure to comment when you've used one.Sincerely,Your friends at Tequipment
EEVBlog HVP70 what is U6 for an IC - Page 1
Forum section: electronics / testgear

author: Tecnologic
author_rank: Newbie
timestamp: June 02, 2021, 11:52:42 am
content: Hi All,my HVP70 Diff Probe was some months in the drawer and now the batteries have spilled there internals everywhere. So i cleaned the mess and used the external 9V Power jack at the side but it didn't do anything. After some measurements i connected the powersupply and identified U6 as faulty because it was getting very hot at 2V 1A inputso i desolderd it and everything is fine.My Problem now is i want to find a replacement for U6 which must be some kind of a switching power ic in MSOP-8 but the markings are etched away. Does anyone have a idea what ic this is?Thanks

author: rvalente
author_rank: Frequent Contributor
timestamp: June 02, 2021, 11:58:19 am
content: Are the pins still attached to the package? Is yes id try to clean with gel flux and hot air
60mm fan for Rigol DS1102E - Page 1
Forum section: electronics / testgear

author: msknight
author_rank: Regular Contributor
timestamp: May 28, 2021, 01:03:05 pm
content: I was following the discussions on people replacing fans in their Rigol oscilloscopes and it was a 50x50x15 maglev Sunon.Ordered the fans, (from Germany) they arrived, got here and I took the thing apart to find it is 60x60x15 !!!Before I just go and get Sunon maglev slightly larger, because there seem to be different versions of even the same size/voltage fan, I thought I'd ask. Preferably something I can get from within the UK relatively quickly because I now have an oscilloscope on the floor in pieces.

author: Doctorandus_P
author_rank: Super Contributor
timestamp: June 01, 2021, 08:42:07 pm
content: I replaced the fan in my DS1052E shortly after I bought it (quite some years ago).I put in a much too big fan and placed it at some weird angle and fastened it with maybe some tie wraps and maybe even some soft foam in the mix so fan sound does not get coupled into the housing.Works good, never had any problem with it.Do not spend too much time to make it look pretty. Nobody sees that after you close the housing.For other projects I've also had success with making air guides and funnels from simple cardboard.But do make sure it's done properly. For example keep any wires away from the fan blades.Bigger fans also move more air with lower RPM's, so also make less noise. I also put in a series resistor (or maybe even an LM317) to lower the fan voltage and noise.

author: rdl
author_rank: Super Contributor
timestamp: June 02, 2021, 05:13:51 am
content: It looks like there's plenty of room to cram something larger in there, but even if sticking with the 60x60 size I'd probably go for 25mm thick.
Tektronix TLA704 stuck in power-on diagnostics - Page 1
Forum section: electronics / testgear

author: CambridgeMart
author_rank: Regular Contributor
timestamp: May 29, 2021, 07:53:50 pm
content: I'm resurrecting a TLA704 logic analyser. The first job was replacing the NVRAM chip on the controller board, this was successful. Nex, I replaced the HDD with a micros SD card in an IDE adapter, installed Windows 98SE and version 3.2 of the application software.All good so far, all diagnostics passed but the TLA 7L3 module failed self calibration; knowing this also has a battery backed NVRAM device, I reasoned that this was also bad, so fitted a replacement. Now, on power up, the application shows 'Running power-on diagnostics Slot 3 TLA 7L3 LA' and doesn't get any further. The 'Ready' LED on the 7L3 is lit, so not sure what's happening.Is there any procedure required after replacing the NVRAM device in a plug-in module?

author: CambridgeMart
author_rank: Regular Contributor
timestamp: June 01, 2021, 10:22:53 pm
content: I checked the old NVRAM device and it still had enough battery life left to hold some data (it wasn't 100% reliable and 1 or 2 locations were changing 1 bit); I programmed that data into the new device (thankfully I socketed it), refitted it and it now boots.
Keysight U1282A DMM Connector Question - Page 1
Forum section: electronics / testgear

author: Old Printer
author_rank: Frequent Contributor
timestamp: May 28, 2021, 07:55:27 pm
content: I recently came across this meter, along with a pile assorted Pomona leads, mini-grabbers etc. I am just a self-taught hobby guy and it is way out of my league needs wise, but it was a great deal and in pristine condition. In between the banana inputs on the front panel is a different type of connector labeled RMT, for remote control. Keysight sells a probe U5404A with a switch on it so you can make incremental measurements by pressing the button. It can also be programmed to trigger a variety of functions, like mulling out a measurement or turning on and off the backlight. Keysight does not say what the connector is, other than a vague 4mm reference in the probe description. It seems to be a slip fit, and there is a small pin in the center. Keysight gets $60 for the special probe, but if I could get a connector I could cobble up something myself. Does anybody know the proper description for this connector? I’ll probably rarely use it, but would like to give it a try. Thanks

author: Old Printer
author_rank: Frequent Contributor
timestamp: June 01, 2021, 12:54:06 pm
content: Maybe Dan Bogdanoff would know? I have been looking, but come up empty.
Anyone know what this is? Rohde & Schwarz Polyskop SWOB 5 - Page 1
Forum section: electronics / testgear

author: cowasaki
author_rank: Frequent Contributor
timestamp: December 02, 2019, 09:28:27 pm
content: Rohde & Schwarz Polyskop SWOB 5Went to buy a scope today and the seller had the contents of his dads lab to go through. Most of the stuff was RF based stuff and this monster was sat in the corner. Anyone know what it is? What it's used for? What it's worth?

author: DaJMasta
author_rank: Super Contributor
timestamp: December 02, 2019, 09:35:06 pm
content: A quick google does turn up a datasheet, but from what I understand it's basically a scalar network analyzer. You have the RF output into the device, then a couple of remote probes to measure power at different nodes. It also has some sort of demodulation capability, so you may be able to do signal analysis on what comes through the DUT (send in a data waveform modulated onto a carrier, recover the data on the other side to see how the DUT has effected it).

author: free_electron
author_rank: Super Contributor
timestamp: March 09, 2021, 01:35:15 am
content: That is a very specialistic piece of kit made to align TV tuners on the factory floor. At allows you to adjust all the amplifiers and filters for the various UHF and VHF ( sometimes even higher like for satellite tuners ) It is a bode diagram plotter.

author: angelo corsaro
author_rank: Newbie
timestamp: May 31, 2021, 12:55:11 pm
content: lo Swob 5 non è assolutamente quello che ti hanno detto in precedenza. Fai attenzione. La fabbrica di strumenti germanica produce la famiglia di generatori sweep detti Swob da molti decenni. . lo Swob5 , se funzionante, è un ottimo sweep generatorfino alla frequenza di 1000 MHz .. non ò difficile procurarsi il manuale di istruzione , Sono disponibili sia nuovi che usati , molti accessori indispensabili ... Il connettore principale ( N male Connector) ò appunto l a uscita RF . con le manopole puoi stabilire la banda di frequenza un cui lavorare, il livello di uscita di RF e l'ampio monito ti permette di vedere l'andamento del ''device'' che stai misurando . Generalmente ci si tarano dei filtri RF , sia attivi ( mede frequenza radio) sia passivi com,e filtri passa banda , filtri passa basso , filtri passa alto . Con le reti che ti accennava qualcuno , lo swob non c'entra nulla . Tranqulliizzati . Si tratta del miglior e sweep generator al mondo . tutto qui. Quanto vale . Prima di tutto bisogna sapere se funziona. Poi se è presente la testina contenete il bolometro che serve a collegare la uscita del device ( ad esempio un filtro ) che stiamo misurando . Questo strumento ha circa 30 35 anni . Se funziona è ottimo . Nel 1990 costava circa 7000 marchi tedeschi . Oggi funzionante e completo di bolometro può valere 500 Euro tranquillamente..
cheap scope available - Page 1
Forum section: electronics / testgear

author: Vincenzo
author_rank: Regular Contributor
timestamp: May 28, 2021, 02:49:37 am
content: A friend has this scope for $50+shipping. Will ship in the US (and probably elsewhere).

author: bob91343
author_rank: Super Contributor
timestamp: May 28, 2021, 03:47:19 am
content: Location?

author: Vincenzo
author_rank: Regular Contributor
timestamp: May 28, 2021, 03:48:47 am
content: good old US of A, but I got a couple of PM from Americans who are willing to pay the shipping and don't know how to delete this post
TDS3000B TDS3054B rotary encoder repair/replacement - Page 1
Forum section: electronics / testgear

author: volvo_nut_v70
author_rank: Regular Contributor
timestamp: May 28, 2021, 02:37:55 pm
content: There is a old thread on this subject, EEVBlog suggested I start a new topic.https://www.eevblog.com/forum/repair/tds3000b-tds3054b-strange-type-rotary-encoder-repairreplacement/?allI came across this forum reply to add a RC network for some off the strange issues on the TDS3000 series rotary encoders. I have also attached a PDF of the page and data sheets on the encoder.https://forum.tek.com/viewtopic.php?t=138339&__cf_chl_jschl_tk__=0d4e85ac3b11421915353ca7411c14a71c172df8-1622211682-0-AUAAcvJKG81kxYX7ctnquK6drHfjl3815wQWU1cgh8tI_L_QB-u3rKr9JyQXrFd7zG_mb_Rub6_osZXLs45oKeCtzrIN411HOKbQYK9IAlYD-nfaVnPMyCeoqw5BJS5xUZlXVEJA-skGrzliUi7lWN_M1tBpg6RkGHTziwrW1BxRboRKL6Jg2RX6nsPl9tea8RAryG1We5qgdOZw8EqzSjEfztNhmrh4yzx8ZYd_0HcWH9LKDgO2IQKavMht0KnE5x_MSZzOGGL_4VMg3QrCwI_rYRDn0OKz_4qIo5ar9c-MC6rNEyByyXcotz4LIjXv9YU0Lb66KAxnU6ZzxEO2mOvfpd6-zLrJL6eY8JKl6n7n1zcSFjVEbORBUP1Zhuglsc6NrRhe235IH63mV_FCZMqpnA2TOgePSeD3lRi604hRnWZfmtuIb3DIl9gzedK-gr5wOrcctmQXceMfNT4DV9l5sU9skkWC1YCus8s7Cnd5
adding a filtering cap to a cheap pocket meter - Page 1
Forum section: electronics / testgear

author: Vincenzo
author_rank: Regular Contributor
timestamp: May 27, 2021, 07:20:35 am
content: I just found this article and thought it's worth sharinghttps://www.jackenhack.com/aneng-an8008-modify-for-better-accuracy-faster-readings/Since those new little chinese meters are deservingly popular here and everywhere (bang for buck, opposite to overpriced). I don't have any aneng or uni-t because I don't need any right now, but I have an old victor vc921 which is probably coming from the exact same factory, it's been a great little thing for less than $15 for all those yeas and perfect for what it was used for. I cracked it open for the first time and found no battery line filtering caps what so ever (probably a tiny little smd ceramic one that I missed when following the tracks). I added a 33uF/25v little smd cap, and the meter started acting like a fluke!!! It stopped bouncing, the thing I got used to with this meter for many years. You touch the to-be-measured points, and the value is instantly there. (sorry, forgot to take pictures of the process and the scope before/after, but there was an amazing difference)There is a guy on youtube (https://www.youtube.com/watch?v=idf8nRw19DM&t=840s,"Kiss Analog" has long but great videos), who once opened up a cheap but good looking ebay power supply and added a few caps he called "white filter caps" that practically eliminated all the switching noise and probably made the value of the thing many times what it was new.Is this a new philosophy in budget thinking (like Dave and others say, tear it down first) to buy cheap stuff and add a bunch of caps (mod before using) to make them act fancier?Is evreyone doing this these days?
Rigol DS1102 Z-E & E versions - Page 1
Forum section: electronics / testgear

author: captainkanpai
author_rank: Newbie
timestamp: May 27, 2021, 08:18:56 am
content: Hello all!I've already been DIYing for many years, but mostly small things.Now I finally have the budget to buy my first (fancy) bench-top oscilloscope.I don't need the most fancy one tho...Now that I started looking, I ended up on the Rigol DS1102E.But after searching further I noticed the DS1102Z-E version is waay cheaper, but to me the specs looks identical.Can someone tell me what the exact differences are?Thank you in advance!Cheers

author: duckduck
author_rank: Frequent Contributor
timestamp: May 27, 2021, 09:20:17 am
content: https://www.tequipment.nethas the specs listed for each. E has 1 Mpts memory depth. Z-E has 24 Mpts. Not sure what the other differences are. I'm sure your local Rigol dealer would love to talk to you about them.

author: Anthocyanina
author_rank: Frequent Contributor
timestamp: May 27, 2021, 09:24:32 am
content: The 1102E is much older than the 1102Z-E. For some reason the older ones have stayed more expensive than the newer ones. the Z-E has a larger display, more memory, Intensity graded display, should also be faster, and has more functions than the 1102E

author: captainkanpai
author_rank: Newbie
timestamp: May 27, 2021, 09:30:15 am
content: Ahh thank you for the replies!So it's exactly like I thought.The Z-E version is the new version and somehow the older version stayed more expansive.I'm guessing because of the popularity and them hoping that people would not look further?I guess the Z-E will be rocking my desks in the coming days!
MDP-XP 30V 5A Adjustable DC Mini Power Supply - Page 1
Forum section: electronics / testgear

author: Electro Fan
author_rank: Super Contributor
timestamp: November 22, 2020, 09:50:21 pm
content: looks interestinghttps://www.aliexpress.com/i/33056122346.html

author: S. Petrukhin
author_rank: Super Contributor
timestamp: November 23, 2020, 10:28:34 pm
content: Quote from: Electro Fan on November 22, 2020, 09:50:21 pmI wanted to buy such a toy, but it seemed very expensive for the cat in the bag..Maybe Dave would break it.

author: alexwhittemore
author_rank: Frequent Contributor
timestamp: December 26, 2020, 09:09:05 pm
content: I'm honestly not sure whether this project is dead. People have been asking for source code for years; it's still not released. The display module serves no purpose that I can see over just the supply module. The supply module has a USB-C input, but it only supports QuickCharge, not USB-PD, which would seem to be WAY more useful.I just got one of these and... honestly I'm not sure. The supply module itself seems like a really great device, but COULD be a lot more. The display module seems completely useless, and mostly just makes you miss the features you'd expect it to support.

author: stanmad
author_rank: Newbie
timestamp: May 26, 2021, 07:31:37 pm
content: To turn off MDP-XP or MDP-P905 press and hold SET + MENU buttons for 3 seconds. This works with the current firmware at the time of writing.I'm posting this here in case anyone else was wondering. I had to email Miniware to understand how to turn off this power supply
GW-INSTEK Dealer/Broker - Page 1
Forum section: electronics / testgear

author: rvalente
author_rank: Frequent Contributor
timestamp: May 26, 2021, 12:30:04 pm
content: Hello Mates,i need to import a GPT-9603 to Brazil. Could anyone point to a instek dealer/broker? Preferably directly from taiwan who does business in Aliexpress/Ebay?

author: rsjsouza
author_rank: Super Contributor
timestamp: May 26, 2021, 01:50:00 pm
content: rvalente, você precisa de nota fiscal? Talvez esses caras aqui?https://www.homis.com.br/gw-instekOu veja se a TME emite nota para o Brasil:https://www.tme.com/br/pt/details/gpt-9802/verificadores-eletronicos-de-seguranca/gw-instek/

author: rvalente
author_rank: Frequent Contributor
timestamp: May 26, 2021, 05:10:13 pm
content: Hello Souza,i've contacted Homis but their price is 43% more expensive than importing myself (paying full taxes).I'll try TEM supplier

author: rsjsouza
author_rank: Super Contributor
timestamp: May 26, 2021, 07:18:30 pm
content: Quote from: rvalente on May 26, 2021, 05:10:13 pmWow... Quite a hefty charge indeed, but depending on the paperwork involved (despachante, etc.) it may cost around that. If you do all the customs clearance yourself then you come ahead.TME worked very well for me in the past, but they shipped to US.Boa sorte!
Solartron 7061 wont store cal constants - Page 1
Forum section: electronics / testgear

author: justanothername
author_rank: Regular Contributor
timestamp: May 24, 2021, 02:45:46 pm
content: Hello Everyone!I got a Solartron 7061 in a pretty good (optical) condition. Today I was able to calibrate it with a precision voltage source. Seems to be well within specs afterwards.Only, when I powercycle the unit, it seems to loose calibration. Values are way off, just as before calibration. I already changed the internal battery, but as I understand, it is only for settings history, not for calibration constants.I do use the refresh command, it gives me a DONE back. After power cycling, I can see the custom string I entered as "date", so I assume IC113 is at least partially good...Anyone an idea whats happening here?Thank youM.

author: Kosmic
author_rank: Super Contributor
timestamp: May 24, 2021, 10:24:40 pm
content: Did you enter the refresh command ?From the maintenance manual, page 2.22:

author: justanothername
author_rank: Regular Contributor
timestamp: May 25, 2021, 04:44:23 am
content: yes, I do. It takes some time, and says "DONE".

author: bdunham7
author_rank: Super Contributor
timestamp: May 25, 2021, 05:09:57 am
content: Have you tried calibrating it and then NOT refreshing before a power cycle?

author: justanothername
author_rank: Regular Contributor
timestamp: May 25, 2021, 05:12:42 pm
content: Quote from: bdunham7 on May 25, 2021, 05:09:57 amYes right now. Did not work. The date string is stored though. I ordered two spare eeproms, maybe IC113 has some weird faulty bytes.What puzzles me is that "REFRESH" should verify the eeprom contents and give me an error in case of a fault.
ITECH IT8500G+ Series (DC Electronic Loads with USB PD trigger) - Page 1
Forum section: electronics / testgear

author: mightyohm
author_rank: Regular Contributor
timestamp: April 29, 2021, 10:11:59 pm
content: Has anyone taken a look at this new line of electronic loads from ITECH?https://www.itechate.com/en/product/dc-electronic-load/IT8500Gplus.htmlThe IT8500AG+ is interesting because it has USB load connectors on the front panel and supports USB PD, which seems like it would be handy for testing USB chargers. I haven't seen an electronic load with PD built in before.I don't see any distributors for ITECH in the US, so I'm not sure how to actually get ahold of one of these.

author: thm_w
author_rank: Super Contributor
timestamp: April 30, 2021, 10:07:50 pm
content: It does look handy, but I don't see specifically what protocols are supported, just "8". If they end up charging a large premium then for hobby use you'd be better off making your own adapter board and buying a USB PD switcher module for ~$10.Some prices of their older units here:https://www.itechcanada.ca/products/dc-e-loads/I'll email them see if they have any info.

author: mightyohm
author_rank: Regular Contributor
timestamp: May 03, 2021, 10:37:50 pm
content: It says that it supports USB PD, which is good enough for me.Let me know if you hear back regarding pricing. I contacted itech via their website but so far no reply.

author: thm_w
author_rank: Super Contributor
timestamp: May 12, 2021, 05:25:59 pm
content: https://www.itechate.com/uploadfiles/%E4%BA%A7%E5%93%81%E5%8D%95%E9%A1%B5/IT8500Gplus-en.pdfQuote from: mightyohm on May 03, 2021, 10:37:50 pmThey are available now, price for IT8512G+ is $982 CAD ($811 USD).- 150V 30A 300W- QC2.0, QC3.0, PE+, PE2.0+, USB PD2.0, USB, PD3.0, FCP, SCPSeems very reasonable considering what kind of customers would use USB PD testing.

author: Lena
author_rank: Newbie
timestamp: May 24, 2021, 05:36:29 am
content: Here's what I know about itechitech Direct：https://www.amazon.com/itechitech Distributor：https://www.tequipment.net/search/?F_Keyword=itechIf there are other models that cannot be found on these two sites, I will contact the itech staff members directlyE-Mail: info@itechate.comService Hotline: +886-3-6684333Technical Support: fae19@itech.shHope these are helpful to you
Siglent 1202X – serial decoder issues - Page 1
Forum section: electronics / testgear

author: klostery
author_rank: Newbie
timestamp: May 25, 2021, 03:23:49 pm
content: Siglent 1202X – serial decoder issues or firmware bug ?Verifying the initial communication of an energy meter I end up to debug the serial UART decoder of my scope (Siglent 1202X-E – Hardware 00-02 – Software 1.3.26).The scope is connected to TX line (yellow trace) and RX line (pink trace) of the serial communication from a master (ATtiny84) to an energy meter (CS5490). After reset the energy meter starts with 600 baud, 1 start bit, 8 data bits, 1 stop bit, idle = high level.The first screenshot shows one errors of the decoder:To select the register page the master sends the command 0x80. The decoder of the scope outputs a value 0x00 as decoded data. That is not correct. This is an error.The yellow trace shows between the markers the start bit (0) and the 8 data bits 0b1000000 = 0x80. Timing is o.k. – t = 600 baud x 9 bit = 15 ms. Stop bit is outside the cursors so that the MSB is the last bit (logical 1) inside the cursors.The second screenshot shows another error of the decoder:To read the config register the master sends the command 0x00. The decoder of the scope outputs a data error. That is not correct. This is an error.The yellow trace shows between the markers the start bit (0) and the 8 data bits 0b0000000 = 0x00. Timing is o.k. – t = 600 baud x 9 bit = 15 ms. Stop bit is outside the cursors so that the MSB is the last bit (logical 0) inside the cursors.By the way, the reply of the energy meter is 0x00, 0x20, 0xC0 and correct decoded.The third screenshot shows the complete start of the communication. It contains both errors.After that I checked some other byte values to be decoded:- Correct decoded bytes: 0x01, 0x7F, 0x81, 0x55, 0xAA, 0xFF.- Faulty decoded bytes: 0x00, 0x80.These errors are independent of the baud rate. Using 9600 baud the pictures are nearly the same only the timescale is different.May someone doublecheck my observations with another Siglent 1202X or Siglent xxxx?How to fix the UART decoder problem?- To change the protocol of the energy meter is not an option.- Should the scope be returned?- Is a firmware update planed or available on request?
Korad KAA3005P making noise - Page 1
Forum section: electronics / testgear

author: psysc0rpi0n
author_rank: Frequent Contributor
timestamp: January 30, 2021, 10:11:36 am
content: Hello.Back in the end of 2019 I bought a pair of this Korad KA3005P. I don't use them that much, because I'm only a hobbyist. I don't work with electronics (unfortunately).Yesterday I connected an external fan to one of the power supplies at like 10V and 200mA and all of a sudden, the power supply started making a noise that looked like something was in contact with the internal fan. But visually, was nothing touching the fan.So, I opened the case to see if there was anything from the inside, toughing the internal fan, but again, nothing visible.Then I thought this also sound like when there is poor electrical contact, there are sparks and those sparks produces that clicks. So I turned all lights of the living room off but I couldn't spot any sparking either.Then I thought, well maybe it's the internal fan doing noise inside the fan itself, so I unplugged the wires that connect the internal fan to the power supply board and tried again. weirdo af, the noise was still there. And it seems to come from the plug where the mains power cable is connected in the back.My question is if anyone already had a similar experience with these power supplies or even with any other power supple brand/model and what to do?My power supplies are still within warranty time and I already contacted the online shop where I bought them but probably they will only reply next Monday or so!Any feedback is appreciated.ThanksPsy

author: psysc0rpi0n
author_rank: Frequent Contributor
timestamp: February 05, 2021, 09:06:21 pm
content: Up...Any ideas, suggestions, anything?

author: Algoma
author_rank: Frequent Contributor
timestamp: February 06, 2021, 02:23:52 am
content: 230V 50Hz? - is the sound at 50Hz or 25hz? you can get an audio frequency measuring app for your phone? .. Those Korads have a few Relays back there.. might be one clicking. Put an Audio meter app on your phone and see if you can narrow down the source, instead of risking your ears anywhere close to mains voltage.

author: psysc0rpi0n
author_rank: Frequent Contributor
timestamp: May 24, 2021, 08:02:16 pm
content: Quote from: Algoma on February 06, 2021, 02:23:52 amI completely forgot this thread.Well, somehow the noise stopped. I contacted the online shop and they told me to record a small video showing the noise, and after that, I couldn't hear the noise again... :s
Yokogawa WT210 power meter firmware needed (EPROM dump, HEX/BIN files, etc) - Page 1
Forum section: electronics / testgear

author: JeffK
author_rank: Contributor
timestamp: May 01, 2021, 03:46:13 pm
content: Looking for the EPROM firmware for a Yokogawa WT210 power meter. At least rev 1.11 or later. Yokogawa has declined to upgrade the meter at their facility or share the EPROM bin files.If you have a WT210 with at least 1.11 firmware or later and would be willing to help me out, please contact me directly. I have an EPROM reader/programmer and would be glad to work something out with you.

author: PE1RQF
author_rank: Newbie
timestamp: May 07, 2021, 12:50:56 pm
content: Hi,I have 1.12 in my unit.regards,Erik

author: JeffK
author_rank: Contributor
timestamp: May 26, 2021, 04:41:19 pm
content: Erik,Thank you very much for the firmware! The EPROM upgrade worked in my WT210.It was more difficult to find good "tested" EPROMs than I expected. I ended up sourcing them from 3 different suppliers on eBay and only one set operated in the equipment.
Minimal Setup for pyVISA & NI GPIB-USB-HS  - Page 1
Forum section: electronics / testgear

author: JohnPi
author_rank: Regular Contributor
timestamp: March 24, 2019, 11:57:50 pm
content: I'm trying to setup a new PC (Win10 Pro) with pyVISA. in the past, I've done this type of thing by installing massive NI libraries & setups -- these run multiple services in the background and in the end I'm not sure what is/isn't necessary and I don't like arbitrary software running on my machines.Does anyone have a description of theminimalsetup needed ? e.g. Can I get by with just the NI GPIB-USB-HS drivers (doesn't seem so) ? I'm sure I don't need the NI PXI services, nor the network services, but what about the other 'helpers' ? Do I need the whole NI-VISA installation ? Can I just extract and move the necessary files from it ?

author: JohnPi
author_rank: Regular Contributor
timestamp: May 22, 2021, 11:16:55 pm
content: Any hints on this ? I'm setting up and new machine and have to go through this again

author: alm
author_rank: Super Contributor
timestamp: May 23, 2021, 09:33:27 pm
content: I have never tried this, but what I can tell you, is that on the hardware side you will need the USB driver for the GPIB-USB-HS (just check the driver name on another system with NI-VISA installed), and on the Python side, for PyVISA you will need visa-32.dll or visa-64.dll (depending on if you use a 32-bit or 64-bit version of Python), and if you would access GPIB through PyVISA-py, you would need gpib-32.dll (looks like this only supports 32-bit Python). As for what is needed to make those components communicate, like other DLL files, drivers or services, that would require trial and error, or investigating an existing NI-VISA installation using tools like Process Monitor or Dependency Walker. If you go through this exercise, then please post the results here.

author: nctnico
author_rank: Super Contributor
timestamp: May 23, 2021, 09:37:02 pm
content: Recently I dabbled a bit with PyVisa and the latest version no longer depends on NI-VISA libraries. At least on Linux.Edit: the library for a pure Python instrument interface is called pyvisa-py (https://pyvisa-py.readthedocs.io/en/stable/). The only interface not supported seem to be hardware GPIB cards. Serial port, ethernet and USBTMC seem to be supported.

author: jjoonathan
author_rank: Frequent Contributor
timestamp: May 23, 2021, 10:52:32 pm
content: If you buy a VXI11 Ethernet-GPIB adapter (e.g. I use AD007s) you don't need to install USB drivers, you just add pyvisa-py to your pip list and go! Also, routing, sharing between hosts, and passthrough to VM becomes trivial
Hantek 6104BD Oscilloscope  - Page 1
Forum section: electronics / testgear

author: Electron123
author_rank: Contributor
timestamp: May 23, 2021, 07:25:23 pm
content: I'm shopping for a first oscilloscope. I'm hoping to use it for repairing things. There seem to be a zillion on the market but most seem kind of obscure and it's hard to fine reviews. The Hantek 6104BD looks interesting and is in the right price range. Does anybody know if it's any good? Portability isn't a requirement for me but is a nice plus.
Sensepeek probes- replacement pogo pins - Page 1
Forum section: electronics / testgear

author: grouchobyte
author_rank: Regular Contributor
timestamp: March 13, 2021, 08:49:40 pm
content: I have some sensepeek probes and want to get some replacement pogo pins since they can get damaged fairly easily with regular use. Sensepeek will sell the replacement pogo pins, which are of decent quality, but want to charge an arm and a leg for them. I found some on Amazon and they fit okay but the spring force and travel are not optimal and the sharp end is also not great(sharp)......cheap $$ though.Does someone have a good, reasonable pogo pin source they can recommend?These are the Amazon pogopins that fit and kinda work okayhttps://www.amazon.com/dp/B0841NK1QY/ref=cm_sw_em_r_mt_dp_1K8QRPJX1TG1HFPKH98M?_encoding=UTF8&psc=1Thanks@grouchobyte

author: tautech
author_rank: Super Contributor
timestamp: March 14, 2021, 07:40:14 am
content: Digikey seem to have a large selection:https://www.digikey.com/en/products/filter/contacts-spring-loaded-pogo-pins-and-pressure/311?s=N4IgTCBcDaIA4HsDmCAEcCWA7AziAugL5A

author: Noy
author_rank: Frequent Contributor
timestamp: March 14, 2021, 09:08:09 am
content: The amazon ones are the same china ones you can get even cheaper on Aliexpress also with different heads. Maybe you should ask one of these sellers (https://m.de.aliexpress.com/item/32944964110.html?srcSns=ch.threema.app&spreadType=socialShare&bizType=ProductDetail&social_params=60041755693&aff_fcid=a17fb009f85a4982982eeeba55a84744-1615713149715-02885-_uxTctd&tt=MG&aff_fsk=_uxTctd&aff_platform=default&sk=_uxTctd&aff_trace_key=a17fb009f85a4982982eeeba55a84744-1615713149715-02885-_uxTctd&shareId=60041755693&businessType=ProductDetail&platform=AE&terminal_id=86bf7cb44a0d4041a23e4117464b9686)for other forces or you buy the Kind you want from Ingun (https://ingun.com) they are professionals for these (ATX and Probemaster are propably using Ingun needles). But they will cost you both arms and legs ;-)

author: Dr_Bob
author_rank: Newbie
timestamp: May 22, 2021, 12:40:57 pm
content: Apologies, I'm a bit late to the party here...A bit of investigation leads me to believe the Sensepeek ones are Harwin P13-0123 pin probes in S13-503 receptacles.Sleeve:https://www.harwin.com/products/S13-503/Probe pin:https://www.harwin.com/products/P13-0123/Came across this thread as I'd just bumped my bench and sheared the probe tip off. Mine came with a spare set of four probe pins, but the only trouble is it sheared flush with the sleeve body so I can't get the pin outBob.
Any Linux software for these cheap Chinese made USB RF Power Meters? - Page 1
Forum section: electronics / testgear

author: mindcrime
author_rank: Unknown
timestamp: May 21, 2021, 09:30:51 pm
content: Gang:I was chewing on spending a few bucks to buy one ofthese USB RF Power Meters, but wasn't sure if any Linux based software existed for working with them. Do any of you know if such a beast exists, or - failing that - if the protocol for these things is documented anywhere to the point that I could write my own software for pulling data off the device?If the answer is "no" to both questions, any other recommendations for a cheap meter like this that *does* have Linux support, or a well documented protocol?

author: mindcrime
author_rank: Unknown
timestamp: May 21, 2021, 09:54:48 pm
content: Answering my own question here... it looks like the vendor themselves do ship a Linux version, much to my surprise. I found adifferent listingfor what appears to be more or less the same device, and the other listing actually had a link direct to the download site for the software, and lo-and-behold, there was a Linux version listed.Really surprised, as it seems like vendors of this cheap stuff typically only have Windows versions. Still, I'll take it. Think I'm gonna order one of these things and see if it's good for anything.
Keysight U1241C teardown photos - Page 1
Forum section: electronics / testgear

author: paulbt
author_rank: Regular Contributor
timestamp: May 21, 2021, 01:33:17 pm
content: Hi !Recently I got my hands on a Keysight U1241C IP67 DMM ordered at my workplace. Since I could not find anything on the internet besides outside photos and a french guy on yt reviewing it, mostly out of curiosity I decided to open it and feel the build quality for myself. I also took some photos because I guess there are others out there interested.Note: the grease on the rotary switch was placed by me because it was way too stiff (like brymen) and I really hate it. Now it is much better.Enjoy the photos...part 1

author: paulbt
author_rank: Regular Contributor
timestamp: May 21, 2021, 01:34:47 pm
content: ...and part 2
Blotchy LCD backlight  - Page 1
Forum section: electronics / testgear

author: de_light
author_rank: Regular Contributor
timestamp: May 21, 2021, 11:42:43 am
content: Successful added some filtering caps to my noisy Aneng 8009 rail. Got some flux on the LCD backlight so unthinkingly wiped it down with IPA.Now, the LCD works fine but there are dark blotches when the backlight is in use. Perfectly usable, but slightly annoying. Is this permanent? Am I being overly hopeful thinking if I leave the device somewhere warm it might evaporate out?
Keysight MSO-X 3104T LAN printer in different subnet - how to? - Page 1
Forum section: electronics / testgear

author: nfmax
author_rank: Super Contributor
timestamp: May 20, 2021, 05:56:50 pm
content: I want to move my test instruments to their own LAN, for security. However, if I do so, I find that I can no longer print to my HP network laser printer from my MSO-X 3104T oscilloscope, which worked fine when they were on the same LAN. Configuring the printer with its new address (i.e. on the other LAN) on the setup screen succeeds. Printing eventually times out, after a long wait during which time the front panel buttons & knobs are unresponsive, giving a 'Printer fault.' message.I can print to the printer successfully from a laptop temporarily connected to the test gear LAN. This still prints OK even if I configure the firewall only to allow traffic to ports 631 and 9100 to the printer LAN , which is what I want to do eventually.I suspect the oscilloscope is trying to use DNS-SD/mDNS to 'discover' the printer capabilities (why?) and cannot do so between LANs without a proxy. Is there any way to turn this off? I have tried disabling mDNS on the LAN setup screen, but that made no difference.My scope is running firmware 7.35Any other suggestions welcome!
Another short video, this time starring my BK 1823A - Page 1
Forum section: electronics / testgear

author: Rasterist
author_rank: Contributor
timestamp: May 20, 2021, 12:46:15 am
content: My latest lockdown project:https://youtu.be/6NtPgAMuyqw. If you like it, be sure to check out the previous one, Histogram, on the same channel.

author: xrunner
author_rank: Super Contributor
timestamp: May 20, 2021, 01:21:49 am
content: 31.62277244.72135754.77225663.24555170.710677

author: mindcrime
author_rank: Unknown
timestamp: May 20, 2021, 01:37:43 am
content: Amazing. Love the cliff-hanger ending. I can't wait for the sequel! I hope the heroine doesn't die when the slime-mold galactic overlords come to rescue their cousins...

author: Rasterist
author_rank: Contributor
timestamp: May 20, 2021, 02:46:30 pm
content: Quote from: mindcrime on May 20, 2021, 01:37:43 amShe’ll be safe, but will we?
Voltech PM 300 error on one channel: "Current Overange" - Page 1
Forum section: electronics / testgear

author: JAH981
author_rank: Unknown
timestamp: January 19, 2015, 09:02:16 pm
content: Hi,I recently got myself one of the PM 300 power analyzers as Mr. Jones reviewed in #589, but my unit has a weird faulton what seems to be on channel 3 only.If I go into the menu and select the single phase, two-wire mode, I can select to display one channel at the time with the DISP button, but as soon as I toggle to all three channels or channel three, the display shows only an error message: “CURRENT OVERANGE” (not a typo). If I toggle to default setting with the PROG key (red LED off) the display will only show this error message.I have messed around with almost all settings especially the Inrush Current settings but to no avail. I have not changed anything in the calibrate menu since I do not have or have access to the equipment required to calibrate this instrument.Is there anyone out there that has seen this error message before or have any suggestions, I wouldreally appreciate it!I have attached some “screen shots” to show the error. sorry for the poor picture quality, hopefully you will be able to make out the info.Thanks!!Jon.

author: tatfuture
author_rank: Contributor
timestamp: May 20, 2021, 04:11:24 am
content: HiMe too - Has anyone successfully fixed it, please share it with methank you very much