hybridfree/eevblog-posts huggingface dataset:
Why no offset functionality in 3-1 wave generators? - Page 1
Forum section: electronics / testgear

author: RAPo
author_rank: Super Contributor
timestamp: August 17, 2024, 01:15:58 pm
content: There is an exuberant supply of 3-in-1 devices (oscilloscope/multimeter/wave generator).I've noticed that very few devices have a waveform generator with variable off-set functionality.Why is that? I would happily pay some extra dollars if that was included.

author: indman
author_rank: Super Contributor
timestamp: August 17, 2024, 03:08:05 pm
content: RAPo, I think that a multifunctional device that would combine the full-fledged high characteristics of an oscilloscope, multimeter and generator would cost much more than anything that the Chinese industry now offers.Therefore, to reduce the cost of a 2-1 or 3-1 device, the emphasis is usually placed on the functionality that the manufacturer considers a priority. For example, I bought the ZT-703S because I was mainly interested in the excellent design and characteristics of the multimeter. The oscilloscope's capabilities are also quite good, but there are still questions about the software and the correctness of the measurements. As for the generator, it is of no interest to me and its modest capabilities will rarely be in demand.
Does Tequiptment.net have a forum discount? - Page 1
Forum section: electronics / testgear

author: rwgast_lowlevellogicdesin
author_rank: Frequent Contributor
timestamp: August 16, 2024, 01:56:02 pm
content: Like the title says is there a discount for eevblog memmbers at tequiptment?

author: KungFuJosh
author_rank: Super Contributor
timestamp: August 16, 2024, 02:00:53 pm
content: Yes, but they suck. There's a thread dedicated to it already. And more threads dedicated to the fact they suck.Saelig also has a forum discount, and they're awesome.

author: rwgast_lowlevellogicdesin
author_rank: Frequent Contributor
timestamp: August 16, 2024, 02:06:42 pm
content: Well i want to order a uni t ps, i ordered it off amazon and it got canceled. It seems like tequiptment and ebay are the only other places i can find a uni t udp3055s e. Ive used saleig quite a bit in the past but they dont carry this psu. What is wrong with tequiptment? Im sure ive ordered from them at some point.

author: thm_w
author_rank: Super Contributor
timestamp: August 16, 2024, 10:07:00 pm
content: Looks like amazon has the 3305S but not the 3305S-E:https://www.amazon.com/UNI-T-UDP3305S-Programmable-Laboratory-Resolution/dp/B0C1GRN1X5/and out of stock on their site too:https://uni-trendus.com/products/udp3305s-e-4ch-advanced-series-programmable-linear-dc-power-supplyAnd tequipment also only lists the 3305S as being in stock.https://www.tequipment.net/UNI-T/UDP3305S-E/DC-Power-Supplies-/-Lab-Power-Supplies/So if you try to order the E from them most likely they'll just tell you to wait like all of the other sites are saying to.https://www.eevblog.com/forum/testgear/eevblog-members-discount-at-tequipment/msg4455706/#msg4455706

author: rwgast_lowlevellogicdesin
author_rank: Frequent Contributor
timestamp: August 17, 2024, 01:13:27 pm
content: I did make the order and i guess im waiting. The difference is amazon didnt give me the option to wait they just canceled my order! I probably should have just ordered from the guy on ebay who had 8 in stock... but Tequiptments free shipping saved me like 40 bucks.I looked through my records and i have used tequiptment before, to order a hakko 951 and that went fine. I also tried to order a rigol 1054z in 2015 and they jerked my around for a month about supply issues before the order was finally canceled. I hope this ps doesnt have the same issues.
Procuring an ITECH PSU in the U.S - Page 1
Forum section: electronics / testgear

author: magicmastja
author_rank: Contributor
timestamp: August 17, 2024, 06:47:57 am
content: Hey there folks, ive been working on a couple of automotive interior-cabin board designs on and off for the last couple of years and im starting to look at test equipment for simulating 12-24v car battery conditions. As far as ive been able to find, the ITECH 6512C seems to be the best value buy for what I need given its combination of sufficiently high current and voltage output capabilities, built-in DIN/ISO waveforms, and additional List operations + more. If ebay and Aliexpress pricing falls in line with what retailers in the EU are charging it seems like its going for ~$4k USD or so.The issue is of course, buying a unit from a reliable vendor as a solo entity trying to step up their R&D efforts. I wouldnt normally shy away from Aliexpress (ive had success with small tools, mini-PCs, and an SBC) but given the price tag its enough to give me some pause, if I understand correctly ITECH is itself a reputable bench power supply designer based in China so one might hope that means units going through Ali would be legit but I know things dont always work as we would logically assume lol, do any of you guys have experience buying higher cost power testing equipment through marketplaces such as this?Otherwise, not too sure how or who to approach for picking one of these up, would any of the EU or the 1-2 U.S vendors ive seen carry them be open to selling to a rando? or at the very least maybe a rando who went through the minimum effort to spin up an LLC with a jank Squarespace website lol?Ive looked at alternatives and I just cant seem find either a 1-to-1 substitute or combination of cheaper discrete devices that doesnt either fall short on capabilities or exceed the 6512C pricing by a fair margin. Closest alts coming from the likes of BK Precision (ITECH being their OEM/ODM if ive read correctly), Instek, and Elektro-Automatik.

author: dorkshoei
author_rank: Frequent Contributor
timestamp: August 17, 2024, 04:47:56 pm
content: I bought an ITech 8211 digital load from AliExpress. It was a cheaper version of the BK (for the reasons you suggest)Transaction was fine but it's obviously not a multi thousand dollar item like you're looking at.I buy a lot from AliE (hundreds of orders) generally sub $30 but a few upto $400. I understand the dispute process well but I'm always concerned on the higher value items because it's hard to demonstrate functional problems that are more subtle than "it's dead Jim".For high dollar items you really need to thoroughly research AliE sellers, how long have they been on the site, #orders, feedback.My bigger concern here would be warranty repair. There are reputable sellers in China, if you go this route I'd be having careful conversation with them and thoroughly understand the costs if it has to be returned.Good luck.

author: zrq
author_rank: Frequent Contributor
timestamp: August 17, 2024, 05:05:39 pm
content: IIRC, ITECH is from Taiwan but does have a very strong tie to mainland China.
Replacement Rotary switch in a Fluke 720a and photos - Page 1
Forum section: electronics / testgear

author: NANOJOLTS
author_rank: Contributor
timestamp: August 16, 2024, 10:16:07 pm
content: Here's a comparison of a rotary switch from a (Fluke 720a) and a (Leeds Northrup) rotary switch.I replaced a broken rotary switch (S8) in a (Fluke 720a) with a Leeds Northrup rotary switch.Fluke switch has 4 leaves? and Leeds switch has 3 leaves?.You think it will work?

author: Vgkid
author_rank: Super Contributor
timestamp: August 16, 2024, 11:01:53 pm
content: There should not be a big problem, as long as all of the connections are good. The L&N type 31 switches are good.I did a test on one , a few years ago.https://www.eevblog.com/forum/metrology/4-wire-switch-selectable-resistance-standard/msg1172561/#msg1172561

author: NANOJOLTS
author_rank: Contributor
timestamp: August 17, 2024, 12:43:09 am
content: The Fluke 720a seems to have had failing/broken rotary switches S2 and S8.Photo of manual notice to than affect, dated 3/97.

author: Vgkid
author_rank: Super Contributor
timestamp: August 17, 2024, 01:56:21 am
content: Unfortunately it looks like multi-tech industries website is down
Problems with CH 4 in Lecroy LC574AM  Error CL_match_gains_or_offsets: 4,8. - Page 1
Forum section: electronics / testgear

author: hafrse
author_rank: Regular Contributor
timestamp: August 16, 2024, 05:26:39 pm
content: Hello,I have newly acquired a used LC574AM, but it seems there is a problem in channel 4. When I connect to the cal signal and press Auto Setup, a message appears in red CL_match_gains_or_offsets: 4,8.The displayed trace shows noise only when Volts/Div is lower or equal 0.2V.Any clue where to look? the instrument had manual Reset a number of times but still the problem shown. The other 3 channels are ok.Please see the attached images, last image is when zoomedThanks in advance!George

author: nctnico
author_rank: Super Contributor
timestamp: August 16, 2024, 05:30:51 pm
content: With a bit of luck you can swap the EXT input module with the module of channel 4. But likely this is a contact issue to re-seating the input module itself might do the trick.

author: hafrse
author_rank: Regular Contributor
timestamp: August 16, 2024, 05:44:04 pm
content: Quote from: nctnico on August 16, 2024, 05:30:51 pmThanks, do I need to open the instrument or just release the 2 screws and slide back?

author: nctnico
author_rank: Super Contributor
timestamp: August 16, 2024, 05:56:02 pm
content: Quote from: hafrse on August 16, 2024, 05:44:04 pmYou'll need to open & disassemble the oscilloscope quite a bit. On my Lecroy Wavepro 7200A it was a difficult job especially due to Lecroy using threaded standoffs which may unthread at the wrong end. As in turning the entire threaded standoff instead of releasing the screw. You'll see once you open it up. Be really carefull not to bump / scrape the casing onto the boards. If you can flip burgers at McDonalds, you can also have a career as a senior mechanical engineer at LecroyThe screws at the front just hold a bit of plastic in place to make the connectors stick out nicely.
Hantek Firmware upgrade fails... - Page 1
Forum section: electronics / testgear

author: tgeehobby
author_rank: Newbie
timestamp: August 18, 2024, 02:16:00 am
content: Hi,I have a DSO5102B, with pretty old firmware… 2.06.2 (101108.0), and am trying to upgrade.I have d/l the latest version, 20190830 from the Hantek support site, and put the .up file on a USB, however all attempts to update give the same failure… Error 0xfe … no upgrade files detected.I have tried many different USB devices… some small, some large – nothing works.Could it be that my existing firmware needs an intermediate upgrade to something more recent than 2010.. before it will accept upgrade to 2019 version?I am not trying to upgrade to 200MHz... just update the firmware to current release. 100Mhz is fine for my use.PS I tried replying to a similar post from years ago, but got no response... so, trying a new postAlso tried emailing Hantek support... got no replyAny help appreciated,Thanks.
Keithley DMM6500 -> OLED? - Page 1
Forum section: electronics / testgear

author: 0xFFF0
author_rank: Regular Contributor
timestamp: August 16, 2024, 10:13:11 am
content: Does the Keithley DMM6500 have an OLED display? I've heard that OLED degenerates very quickly. I'm now concerned.

author: tooki
author_rank: Super Contributor
timestamp: August 16, 2024, 12:07:12 pm
content: Of course not. Where would you get this idea? The datasheet says clearly that it’s a capacitive WVGA TFT with LED backlight.
Leeds Northrup 4395 Voltage divider pictures  - Page 1
Forum section: electronics / testgear

author: NANOJOLTS
author_rank: Contributor
timestamp: August 15, 2024, 05:22:04 pm
content: Leeds Northrup 4395 Voltage divider pictures 2

author: Gyro
author_rank: Super Contributor
timestamp: August 15, 2024, 05:40:36 pm
content: You don't have to start a new thread for each set of pictures. Please post them as replies in your first thread.

author: NANOJOLTS
author_rank: Contributor
timestamp: August 15, 2024, 08:56:38 pm
content: Sorry, Not sure what happened. pop-up stated picture size exceeded.
Standford Research DS360 - Page 1
Forum section: electronics / testgear

author: 2nOrderEDO
author_rank: Regular Contributor
timestamp: July 30, 2024, 09:53:05 pm
content: Hello fellow EEVBlog forum users,We are on the process of repairing a Stanford Research Systems DS360 Low Distortion Function Generator.https://www.thinksrs.com/products/ds360.htmlRight now we are trying to get the thing calibrated, but it seems like there are more than 900 calibration constants, and no specific information about what each means. It seems also like there is no information from SRS, except that it is possible to pay 900 USD to get it calibrated.Is there any one around here who has an a list/information about these calibration constants?Regards,2nOrderEDO

author: R-1125F
author_rank: Regular Contributor
timestamp: August 15, 2024, 07:04:59 pm
content: I don't have any expreicnce with this, but did you load the factory cal constants from ROM? If you have, you can compare your readings to the performance tests that are in the manual.
Siglent SDS 1202X-E software up-to-date? - Page 1
Forum section: electronics / testgear

author: Monte Quercus
author_rank: Newbie
timestamp: August 12, 2024, 12:42:48 am
content: Hey there, I have a Siglent SDS 1202X-E and it currently identifies its software version as 1.3.26. When I searched Siglent's website for a newer version, I found SDS7000_V1.5.2.ADS when using my model number as a search term. I am assuming that this is a generic driver pack that applies to different models including my own.My questions to this community:Do I have the lastest software installed?If not, is the version I found on the Siglent's website correct and the newest available?If not, where can I find it?Thank you in advance!

author: CharlotteSwiss
author_rank: Frequent Contributor
timestamp: August 12, 2024, 05:04:31 am
content: The latest version for this model is 1.3.2.7Are you having any problems with version 1.3.2.6?

author: ebastler
author_rank: Super Contributor
timestamp: August 12, 2024, 05:08:34 am
content: You can't use the SDS7000 firmware, not sure what brought you there.Firmware 1.3.27 for your scope is available here:https://www.siglenteu.com/service-and-support/firmware-software/digital-oscilloscopes/#sds1000x-e-series

author: tautech
author_rank: Super Contributor
timestamp: August 15, 2024, 04:14:33 am
content: Quote from: Monte Quercus on August 12, 2024, 12:42:48 amWhich website ?There are 3 official websites that all have the latest FW for your SDS1202X-E.https://int.siglent.com/upload_file/zip/firmware/Oscilloscope/SDS1202X-E_V1.3.27_EN.ziphttps://siglentna.com/service-and-support/firmware-software/digital-oscilloscopes/#sds1000x-e-seriesAnd the EU branch that ebastler has already linked.Be sure to use the correct link for your 2ch model.In each download are also included the install instructions and the revision history.
MSO5000 Jitter and Eye Diagrams - Page 1
Forum section: electronics / testgear

author: sorenkir
author_rank: Regular Contributor
timestamp: October 07, 2022, 09:40:57 am
content: Hello,Just for fun, I have tried the Jitter analysis feature of my MSO5074 (upgraded to 350MHz BW with all options ;-)).I have managed to do consistent measurements of jittery clocks and signals generated with a Wandel&Goltermann Transmission Jitter Analyzer SF-60.10Mbit/s signal with 0.30UI 10kHz TIE jitter:100Mbit/s signal with 0.40UI 10kHz TIE jitter:1Mbit/s signal with 0.40UI 100Hz TIE jitter:Then I wanted to try the Eye Diagram feature, but no matter what I tried in the settings (triggering, eye settings, timebase), I did not manage to get any results.The scope is displaying "Eye analyzing..." but the measure window is not updated, color persistance is not working.Has anyone managed to achieve anything with this feature ?Thanks,Michel.

author: tv84
author_rank: Super Contributor
timestamp: October 07, 2022, 01:44:36 pm
content: Here.

author: sorenkir
author_rank: Regular Contributor
timestamp: October 08, 2022, 10:47:03 am
content: Hi,Thanks for the link.I don't know how you did setup the scope. The histogram seems to have been set manually ?Anyhow, I don't see any Eye measurement: your measure window is filled with *Michel.

author: trampas
author_rank: Regular Contributor
timestamp: November 15, 2022, 12:06:13 am
content: I was trying the jitter measurement on my hacked MSO5074 with firmware 1.03.00.03 and the jitter measurement does not seem to work. Does anyone know why it would not work? All the buttons work but nothing shows up in the measurement.Never mind I figured it out. Apparently you need to zoom way out on the waveform for the jitter measurement to work.

author: sorenkir
author_rank: Regular Contributor
timestamp: November 15, 2022, 01:50:59 pm
content: You are right.I think it needs enough data to perform measurement (in that case only, the message "Jitter analyzing..." is displayed)Michel.

author: androm
author_rank: Newbie
timestamp: July 24, 2023, 10:30:48 am
content: Hi !Can you share which files did you use for the hack to get the jitter and eye analysis ? (actually, i have the MSO 5074)Thanks.

author: Sighound36
author_rank: Frequent Contributor
timestamp: July 24, 2023, 12:01:14 pm
content: Tv84 & myself achived this some 4 years ago, however I wouldn't say it's particularly accurate imhoJust followed the link, yep that's the one we couldn't get it happen on the MSO7000 correctly what ever we tried. Like the RSA3 to 5065 its a hardware issue imho

author: CosteC
author_rank: Regular Contributor
timestamp: August 12, 2024, 06:06:42 pm
content: I managed to get Jitter measurement working, key is many, many cycles on screen to be visible. I am however still not sure how exactly clock recovery works...But totally zero lack on Eye Diagram. Did anybody made it work? Any case, even basic, using build in generator?
Can the digital oscilloscope display G321EV be replaced with a different model? - Page 1
Forum section: electronics / testgear

author: daisizhou
author_rank: Super Contributor
timestamp: August 13, 2024, 04:02:44 am
content: Hallo every oneThis is one of my oscilloscopes. I have been using it for many years.Recently I noticed a circular shadow in the center of the screen,It looks like the glue that bonds the LCD has aged.I was wondering if there is a replacement for this model of LCD screen?Because the same model is very expensiveThe LCD module model is G321EV. Is there any other model of LCD module that can be a perfect replacement?Because if I buy the G321EV, after a period of use, the aging will appear again. I hope to completely solve the screen aging.

author: Fungus
author_rank: Super Contributor
timestamp: August 13, 2024, 05:25:02 am
content: You need to separate the screen from the PCB and see if there's any numbers printed on it.

author: squadchannel
author_rank: Frequent Contributor
timestamp: August 13, 2024, 05:53:56 am
content: Electrically, it should work with the same screen size, resolution, and controller.But mechanically, I don't think it can be installed. It is better to purchase the same LCD panel or replace the polarizer.

author: daisizhou
author_rank: Super Contributor
timestamp: August 13, 2024, 06:11:49 am
content: Quote from: squadchannel on August 13, 2024, 05:53:56 amAs I thought, I initially mistakenly thought it was caused by the aging of the polarizer, but please see the following pictureThe entire screen is made of a horizontal liquid crystal and a vertical liquid crystal bonded together.The horizontal direction is welded by zebra strips, and the vertical direction is conductive rubber.I guess it's because the glue that bonds them together has aged.If I buy the same model, I estimate that the same problem will occur again after a period of time, so I hope to completely solve this problem.

author: daisizhou
author_rank: Super Contributor
timestamp: August 13, 2024, 06:18:51 am
content: Quote from: Fungus on August 13, 2024, 05:25:02 amIt looks like the LCD module model is G321EV。There is no point in buying the same model because the fault will reoccur over time, so I am looking for a perfect replacement model.
Unknow Instruments - Philips  EL7390/00 (see images) - Page 1
Forum section: electronics / testgear

author: Atom
author_rank: Regular Contributor
timestamp: August 08, 2024, 01:47:31 pm
content: Long time no see EEVblog forum,i bought those 2 instruments only for the shell so i could reuse it for other projects, but i also dont like to destroy things mindlessly, and i'm intrested in what they are.i tryied to search for the philips part n. but nothing was found,can someone tell me what those 2 are?Relevant details:- one has writter on it "mittente" - meaning transmittereverything else can be found on photos

author: Atom
author_rank: Regular Contributor
timestamp: August 11, 2024, 08:59:39 pm
content: up? if no one knows whats this i'll close the post in a few days , thanks to everyone that took some time to take a peek of those photos

author: Zoli
author_rank: Frequent Contributor
timestamp: August 11, 2024, 09:52:07 pm
content: Wild guess: analog phone; most likely some long distance lines related.

author: factory
author_rank: Super Contributor
timestamp: August 12, 2024, 07:11:27 am
content: Well they don't look like test equipment, those would be have a GM or PM prefix for the model number. EL prefix is more likely something from the audio/video/communications part of Philips.The front has a connector for use with a tape recorder, the rest I'm not sure.Might be better to ask the same question on some vintage radio/technology etc. forums.David

author: PA0PBZ
author_rank: Super Contributor
timestamp: August 12, 2024, 07:36:13 am
content: My best guess: some kind of induction loop amplifier. I can't find anything about this model but "EL" points at audio equipment.
How to make oscilloscope auto trigger on current spike and pause - Page 1
Forum section: electronics / testgear

author: Rasil1127
author_rank: Newbie
timestamp: August 10, 2024, 01:32:03 am
content: HIi have an HP 54510A oscilloscope. i want to catch a current spike in my circuit but i dont know how.. i dont know what mode this is called but i want the scope to capture the current spike and pause data acquisition. maybe its called auto triggering single shot mode?? the oscilloscope has a single shot mode but its a button whenever i press it i can pause the oscilloscope and check the waveform but i want it to pause on its own when theres a rising edge for example. does anyone know how i can do this? or what this mode is called? the scope has extra bnc connector for external triggering do i have to use this to get what i want? thx.

author: tautech
author_rank: Super Contributor
timestamp: August 10, 2024, 01:36:39 am
content: Like any trigger, its ability to provide a stable trigger is dependant on its Level.Single shot and a trigger level your signal will surpass will provide the conditions to capture the waveform.

author: Fungus
author_rank: Super Contributor
timestamp: August 10, 2024, 03:34:33 am
content: Quote from: Rasil1127 on August 10, 2024, 01:32:03 amWhat you want is "single shot" trigger, definitely not "auto" triggering.There's a way to set the trigger threshold level. When the input voltage passes that level it will trigger and if the 'scope is in single shot mode it will stop and show the trace until you reset it.
Design change: Feeltech FY6900-M waveform generator  - Page 1
Forum section: electronics / testgear

author: Phil1977
author_rank: Frequent Contributor
timestamp: March 27, 2024, 08:38:37 am
content: Hi EEVblog,frankly I don't know if this topic was already handled and even the search function delivered to many results for me to check, so please apologize if this thread may be redundant.I just ordered a new FY6900, and I informed myself about its issues, so I was prepared to replace the internal AC-DC-converter with a set of DC-DC-bricks to make it USB-C compatible.Now I was pleasantly surprised after opening the case: The 6900-M version I received uses the AC-DC-PCB only for a PE-GND-earthed 5V-supply. If you supply power by the USB-B socket, the device already is fully functional and it reaches around +/- 8V at 50Ohm or +/- 12V at 1MOhm. Waveform peaks in the area of the voltage limit look a little disturbed, but anyhow it´s more than enough for many use cases.So instead of a new power supply I only need a USB-C to USB-B converterPlease tell me if anyone wants pics...

author: DaneLaw
author_rank: Frequent Contributor
timestamp: March 27, 2024, 11:03:31 am
content: Im pretty sure these FY6900 have been USB runable throughout many years.On my old unit that I got in the first half of 2020.. that ain't got USB-A but USB-B interface, I can run it from the laptops USB-socket while running the PC program (single cable for both data and power)Or use it with a power bank or my scopes USB out.. - I never use it with its AC input... it consumes very little power, so more or less any powerbank will do just fine.A crude look inside (old model from a clearance EU/GB Banggood sale in first half of 2020)# It looks like its only +5v & ground, ground that are forwarded from the AC to DC board when looking at the board print, and no use of the 12v

author: Phil1977
author_rank: Frequent Contributor
timestamp: March 27, 2024, 11:40:32 am
content: Thanks a lot for your images! It seems the manufacturer is changing the power supply design quite frequently, because yours doesn't have the split voltage supply anmore, but it seems like it has a somehow adventurous earth connection (3-wire flat on DC side).My unit has a somehow more rigid 3-wire connection on the AC side and then just a 2-wire connector from the Power-PCB to the Main-PCB. My unit also has a seemingly retrofitted heat sink on the DC DC-converters on the mainboard. I can not recognize this heat sink on your pictures, so maybe they have retrospectively found a reason to cool these parts.I´ll also post images soon.PS: Of course my unit also has an USB-B socket. In my mind all "old" USB cables are USB-A and the new ones are USB-C.

author: JimDrew
author_rank: Contributor
timestamp: August 10, 2024, 12:18:43 am
content: Here is yet another version - just received today from Aliexpress. This is the 100Mhz version. It seems that the FPGA is a BGA instead of being a QFP like I have seen in other versions. New small power supply like the v1.2, but not fully populated. ALL of the IC's except for the MS5614 have had their numbers professionally (laser) removed.
Guildline decade resistor pictures. - Page 1
Forum section: electronics / testgear

author: NANOJOLTS
author_rank: Contributor
timestamp: August 08, 2024, 10:01:14 pm
content: Some pics inside a Guildline 9345/1 (5) Decade resistor. (0.01,0.1,1,10,100 Ohms)Looks like some, "General Resistance", and some "Vishay" parts.
I need a basic and cheap clamp meter with mA scale.   - Page 1
Forum section: electronics / testgear

author: viper
author_rank: Regular Contributor
timestamp: August 08, 2024, 03:39:44 am
content: I am doing some repair work where I need resolution down to 1mA. Perfect accuracy is likely not needed for this, but a reasonable meter would be nice. Of all my Flukes, I don't have one that can do this. I can't break the wire for a more accurate DMM test.Of the ones I have looked at so far, I am at like $400! Of course I found variants on fleabay for $50 but who knows what they will do.Any help would be great! Probably use this meter only a few times. Have looked at stuff like Klein, but no luck.

author: Someone
author_rank: Super Contributor
timestamp: August 08, 2024, 04:21:23 am
content: This comes up all the time, search the forum:https://www.eevblog.com/forum/testgear/best-budget-(under-$100)-clamp-meter/https://www.eevblog.com/forum/testgear/recommendation-for-a-reasonably-accuarate-dc-amp-clamp/https://www.eevblog.com/forum/testgear/good-clamp-meter-for-low-dc-currents/https://www.eevblog.com/forum/testgear/clampmeter-dc-current-measurement-using-ut210e/

author: J-R
author_rank: Super Contributor
timestamp: August 08, 2024, 05:03:50 am
content: I'd suggest the clamp accessory path, because you can use them with a scope as well.

author: wasedadoc
author_rank: Super Contributor
timestamp: August 08, 2024, 10:28:47 am
content: AC and DC or AC only?

author: Postal2
author_rank: Frequent Contributor
timestamp: August 08, 2024, 01:01:41 pm
content: Quote from: viper on August 08, 2024, 03:39:44 amWrap your thin 1mA wire around your finger 10 times and clamp the entire bundle.

author: viper
author_rank: Regular Contributor
timestamp: August 08, 2024, 03:00:49 pm
content: Quote from: wasedadoc on August 08, 2024, 10:28:47 amOnly working AC right now, but I'd be more inclined to find or buy an AC/DC meter as I'd have plenty more uses on the DC side. Always chasing automotive bugs down.

author: David Hess
author_rank: Super Contributor
timestamp: August 08, 2024, 04:43:52 pm
content: I have been considering the B&K 316 AC/DC clamp meter which has 1 milliamp resolution.https://www.bkprecision.com/products/multimeters/316

author: viper
author_rank: Regular Contributor
timestamp: August 08, 2024, 05:24:54 pm
content: Appreciate the help guys. I have an Owon coming. Probably not the absolute best but we have one of their scopes and can't really complain too much with their quality vs cost. If I end up using it more frequent, I will look towards a better meter.
Rigol DSO1072 vs Siglent SDS814X - Page 1
Forum section: electronics / testgear

author: hooch99
author_rank: Newbie
timestamp: August 08, 2024, 03:11:39 pm
content: Looking at these scopes for my hobby, mostly embedded devices and audio components. Which one is better value?I like 10" screen on Rigol and HDMI out, but heard about many bugs, how serious are those? How about fan noise on these scopes?
Saicor SAI-43A Correlation & Probability Analyzer. What is that for? - Page 1
Forum section: electronics / testgear

author: Jurkstas
author_rank: Newbie
timestamp: August 07, 2024, 07:43:08 pm
content: Noticed one of these for sale for approx. 200€ locally. Have not seen anything like this before. Anyone know what these are/were for? Is it still relevant today? Or just a historical piece? Did some googling, but only found it mentioned a few times in publication references from 70s, but nothing specific, like experiment setup or the like.Some images picked up fromwww.finn.nofor archival purposes.
DM858 Solution 33v DC & short circuit - Page 1
Forum section: electronics / testgear

author: JCS666
author_rank: Contributor
timestamp: August 12, 2024, 09:54:10 am
content: Visit thehttps://bit.ly/DM858Solutionsand download the files, Sorry I don't speak English.Solution: DM858 small short circuit when measuring voltage in automatic mode:Contact Rigol to execute the warranty and have the device repaired. The good news is that it can be fixed, but it must be sent in for repair.
Tek scope with Josephson Junction sampling? - Page 1
Forum section: electronics / testgear

author: PwrElectronics
author_rank: Regular Contributor
timestamp: August 06, 2024, 05:28:26 pm
content: I was having random thoughts today and remembered reading in some trade magazine over 30yrs ago about a high end sampling scope that used Josephson Junctions. It was a beast on a cart and needed a cyrogenic cooling system. Was it a Tektronix or am I misremembering orI know we have some 10G scopes in one of the labs at work but the fastest scope I have ever personally used is 1G.

author: mawyatt
author_rank: Super Contributor
timestamp: August 06, 2024, 05:31:48 pm
content: Recall this was a LeCroy, but memory isn't that good.Best,

author: coppice
author_rank: Super Contributor
timestamp: August 06, 2024, 05:55:18 pm
content: Quote from: mawyatt on August 06, 2024, 05:31:48 pmCorrect. LeCroy made their name with the Josephson junction scope. I don't remember anyone else making one.

author: shakalnokturn
author_rank: Super Contributor
timestamp: August 06, 2024, 11:22:36 pm
content: Which LeCroy was that? I foud no mention of it anywhere, no doubt it was never mass marketed.A few lines about Josephson junction samplers in the attached document.There is reference to LeCroy for a Heterojunction design.

author: coppice
author_rank: Super Contributor
timestamp: August 07, 2024, 04:05:32 pm
content: Quote from: shakalnokturn on August 06, 2024, 11:22:36 pmI had that same issue when someone asked about me superconducting oscilloscopes a few years ago. I thought I was going to find lots of material on the web about such an interesting topic. I found nothing. There were lots of articles at the time in magazines like EDN. So, there might be poorly indexed scans on line, that just aren't showing up in a web search. I actually saw one at a trade show in London. It could have been something not entirely ready for market, but it seemed functional in their demos. I'm struggling to remember the kind of performance figures they were talking about.
Iwatsu DS8600 - Page 1
Forum section: electronics / testgear

author: wolfy007
author_rank: Frequent Contributor
timestamp: February 27, 2022, 11:48:39 am
content: Just putting up a few photos and what ever information I can find for the Iwatsu DS8600 here because I couldnt find much online when I discovered this cute little portable storage scope on Gumtree, in case anyone is interested. My example appears to have been made in about 1990.Was made to run from 3xC cells, 4.5V, made an adapter for a single 18650 and it seems to run fine with it. Can also run from a 4.5V wall wart.The unit has four circuit boards inside;1) A CPU board, with a Hitachi HD63B09P processor, 8bitx8K of processor RAM and 18x16K of what appears to be RAM for data from CH1/2. Most of the chips are standard 74XXX family of chips. The EPROM is a 256K (32Kx8) listed with "DS8600 Ver2.1. (see picture1)2) A Toshiba TLX-1013 LCDpanel and controller board. (Also in picture1)3) A small board for the front panel buttons4) And finally the metal enclosed board containing Channel1&2 input hardware from BNC jacks to AD chips. (see picture2)Nice and neat little scope. Unfortunately my goodleFu wasnt good enough to find a manual on this scope, just a review from the Australian edition of ETI magazine from 1989, which I will attach here once I make a PDF of it.I will post more info as I find it, or if anyone knows more, post it down below, especially if you have a manual or any other documentation. Probably should get a copy of the EPROM too.

author: wolfy007
author_rank: Frequent Contributor
timestamp: February 27, 2022, 11:50:16 am
content: Reserved for any additional information and pictures.

author: milliwatt
author_rank: Newbie
timestamp: January 06, 2024, 10:52:15 pm
content: Old post and I’m guessing you didn’t find any info. I’ve just acquired one of these to play with. Unknown condition but had 3 probes with it which are always handy.On power up, channel 2 works but channel 1 displays no input and I can’t locate a trace. Just looking for input circuit at this stage. I’ll swap channel 1& 2 inputs around on input board and see if that makes any difference. But would be nice to see circuit diagram or am I looking for hens teeth?BestChris

author: niki68
author_rank: Newbie
timestamp: June 27, 2024, 05:52:40 pm
content: I will be grateful if you upload EPROM image. My oscilloscope doesn't boot.Here are scanned operation manuals.

author: chronos42
author_rank: Regular Contributor
timestamp: August 07, 2024, 08:00:39 am
content: Here is the firmware.And replace all electrolytics in the canned inverter module, in my instrument they all leaked and had very high ESR.
Rigol PLA2216 gets hot ? - Page 1
Forum section: electronics / testgear

author: charliex
author_rank: Frequent Contributor
timestamp: August 03, 2024, 06:59:10 pm
content: just picked up a PLA2216 for my DHO924S and the logic probe side gets pretty hot at the probe side with nothing else connected, anyone else get that?i pinged support as well but figured i'd try here too. (also only 20 leads

author: NE666
author_rank: Frequent Contributor
timestamp: August 04, 2024, 08:40:49 am
content: I have the same probe but for use in conjunction with my MSO5000.Yes, it gets warm. Warmer than I'd expected. However, it doesn't appear to cause any issues. I've had mine running for 8 hours at a time some days and it's yet to be a problem. Combined with your experience, I conclude that, for better or worse, that's the way of it.

author: charliex
author_rank: Frequent Contributor
timestamp: August 04, 2024, 09:55:28 pm
content: ok thanks for letting me, know it was definitely hotter than i'd expect for such a thing enough for a smell of plastic.. will see what support says too, also asked for my 32 vs 20 probes

author: charliex
author_rank: Frequent Contributor
timestamp: August 06, 2024, 05:27:46 pm
content: got a reply from rigol, so seems it's normal."The instrument runs hot through the front connections. You can check the internal temp versus its desired temp within the utility menu under the self-test option. There is a board test option that will display some of the self-test metrics with desired range and actual values.I have had a couple customers ask about this and done some temp testing myself. I reached out to the production team with my data. They expressed that the values I provided, through hot, were not dangerous to the machine or the user."
Fluke 8808A 5 1/2 Digit Multimeter voltmeter drifiting - Page 1
Forum section: electronics / testgear

author: sidA30
author_rank: Newbie
timestamp: August 06, 2024, 11:30:47 am
content: Hi,I purchased a Fluke 8808A and everything appeared to be ok.Just sent it off to be calibrated, and now when open-circuit the volt meter drifts (DC) by around 0.2 mV/s initially and slows down around 10mV to around 0.001 mV/s like charging a capacitor. Final resting place seems to be about 20 mV after 30 mins.Is this something I should be concerned about and would this be caused/fault by the calibration house?Thanks.

author: coromonadalix
author_rank: Super Contributor
timestamp: August 06, 2024, 12:02:45 pm
content: could be simply let it warm for 1 hourand for open circuit, the probes could act as antennas, the input circuitry (no probes) could slightly charge up ....if the calibration passed and you are in spec, i would not worry
Keysight MSO-X 2024a reboot loop issue - Page 1
Forum section: electronics / testgear

author: pstemari
author_rank: Contributor
timestamp: August 02, 2024, 06:37:13 am
content: Any updates on how to deal with a Keysight MSO-X 2024a that lights up the buttons, gets to the splash screen, stays there for ~5 seconds and then reboots?Looking through the forum, I found some posts regarding this as a known problem, but the suggestion to update firmware doesn't work. Even with a USB key in the scope at powerup, it goes into the same behavior and doesn't respond to the utility button.Scope was purchased new, the optional packages were purchased from Keysight and installed ages ago. The scope was working fine the last time I used it, some months back, but now it just seems to be a boat anchor.Are there any authorized service centers for Keysight? I tried looking on their website, but the only thing I found was a option to send it in for repair at a flat rate of $4,800. The scope originally cost $3,418, making that price seem pretty absurd.

author: Pinkus
author_rank: Frequent Contributor
timestamp: August 02, 2024, 07:36:26 am
content: This happens due to a defective flash chip. This is known and affects the DOSX/MSOX devices of the 2000, 3000 and 4000 series. Keysight usually repairs these free of charge. My DSOX4024a was also fitted with a new motherboard by Keysight free of charge.You might try to install a new software through the UART interface. I tried and was not successful, however many people were able. This thread (though pretty long) contains all information (starting 2017) you need:https://www.eevblog.com/forum/testgear/dsox2000-and-3000-series-licence-have-anyone-tried-to-hack-that-scope/direct link:https://www.eevblog.com/forum/testgear/dsox2000-and-3000-series-licence-have-anyone-tried-to-hack-that-scope/msg2136181/#msg2136181Edit: also this shall helphttps://www.eevblog.com/forum/testgear/agilent-dsox3054a-not-booting-possible-nand-corruption-help!/msg3449794/#msg3449794Good luck!

author: squadchannel
author_rank: Frequent Contributor
timestamp: August 02, 2024, 12:46:25 pm
content: Quote from: Pinkus on August 02, 2024, 07:36:26 amI think you should send it to Keysight if they will repair it for free. If you try to repair it yourself and can't, I don't know if they will repair it if it is determined to be a modification.

author: pstemari
author_rank: Contributor
timestamp: August 06, 2024, 02:25:20 am
content: Well, I've started the service order process. We'll see how it goes.Damn but this is annoying.
Leeds & Northrup test equipment ??? - Page 1
Forum section: electronics / testgear

author: guizmo1967
author_rank: Regular Contributor
timestamp: August 05, 2024, 12:03:41 am
content: Can someone tell me what is this test equipment used for !Thank you !

author: Vgkid
author_rank: Super Contributor
timestamp: August 05, 2024, 01:27:39 am
content: That is a multiple range current shunt. The sense lines are hooked to the potentiometer terminals. The source lines are hooked to the common , and whichever current range you are measuring.

author: guizmo1967
author_rank: Regular Contributor
timestamp: August 05, 2024, 02:14:09 am
content: Thank you for your respond !As I understand how a shunt resistor work is you measure the voltage drop across the shunt resistor and that way you get the amperage. (I=V/R)With this device, there is 8 terminals marked like this:Ohms Amp.2 .75.1 1.5.05 3.02 7.5.01 15.005 30.002 75.001 150And a common current terminal.Can you give me and example or do you have a user manual for this ??What do you connect to the potentiometer posts ??

author: Vgkid
author_rank: Super Contributor
timestamp: August 05, 2024, 04:37:35 am
content: So you hook the volt meter to the potentiometer terminals. With this, you keep the voltmeter on the 100/200mV range. *Note* the max current would be to keep the voltage across the potentiometer terminal below 150mv/ range resistance. An example 150mv (0.150v)developed on the 0.001ohm range is 150 amps. Idealy keep it to 100mV per range so 100Amps max.For connections hook the common to the ground, and the the intended range to the load. Connect you voltmeter to the potentiometer terminal.Do you have a model number, I do not have any manuals.I can do a crude drawing, but it will be tomorrow.

author: guizmo1967
author_rank: Regular Contributor
timestamp: August 05, 2024, 06:22:33 pm
content: A drawing would be nice !Is this device like 8 different shunt resistors ??Model: 553795, I found nothing on the net !Let's say I just want to measure current through a simple 200W light bulb, how would you connect that ...
Demo Data for Digilent's WaveForms Application (Analog / Digital Discovery) - Page 1
Forum section: electronics / testgear

author: NE666
author_rank: Frequent Contributor
timestamp: July 31, 2024, 04:25:57 pm
content: Greetings.I've downloaded and installed the latest version of Digilent's WaveForms software (v 3.11.1) with the intention of evaluating it w.r.t. its LA/protocol decoding capabilities but, unless I'm missing something, "demo mode" doesn't provide the facility to generate any demonstration signals, nor are any example project or capture files included as part of the install.Is there anyone out there owning a Discovery (either Analog or Digital variant would do) who would be kind enough to either;a) point out where I am going wrong and guide me as to how to find/generate some test data for the Logic Analyser app ?b) share with myself and the forum membership one or more exported Logic Analyser Acquisition files (*.Dwf3logicacq files) which I could import, of either I2C or SPI signals ?Thanks in advance to anyone who can assist.

author: egonotto
author_rank: Super Contributor
timestamp: July 31, 2024, 07:45:30 pm
content: Hello,enclosed are the files from an AD2.Best regardsegonotto

author: NE666
author_rank: Frequent Contributor
timestamp: August 01, 2024, 08:15:55 am
content: Thank you egonotto, much appreciated.

author: egonotto
author_rank: Super Contributor
timestamp: August 05, 2024, 01:29:28 am
content: Hello,enclosed is a 5 mH coil measured with the impedance analyzer with an AD3.The .csv files are with comma as decimal separator (German)Best regardsegonotto
SPD3303X-E Parallel Mode Output Question - Page 1
Forum section: electronics / testgear

author: low_noise
author_rank: Newbie
timestamp: August 03, 2024, 10:27:22 pm
content: Greetings,I have a SPD3303X-E (hardware version 3.0, firmware 1.01.01.02.07R2) that has been modded as a SPD3303X. When in Parallel mode, CH1 and CH2 current output readings do not seem to track each other. The behavior I was anticipating (based on youtube review) is that Channel 1 and Channel 2 readings would be the same, contributing equally to the total output.Instead, the behavior I am observing is that Channel 2 will have near zero current output up until channel 1 current output has reached it's max. Once channel 1 has reached its max current setting, then channel 2 reading will increase until the max current setting.Does anyone happen to know if this is normal behavior for the more recent firmware and/or hardware revisions?Thanks in advance

author: tautech
author_rank: Super Contributor
timestamp: August 03, 2024, 11:33:29 pm
content: Welcome to the forum.In the earlier HW this is normal.From the Quick Guide P15https://int.siglent.com/u_file/download/22_11_25/SPD3303X_QuickStart_E02A.pdfCH1/CH2 Parallel modeInstructionIn the parallel mode, CH1 and CH2 are linked internally into one channel which is controlled by CH1.Its output current value istwice as much as the single channel.In later HW the OSD has been changed for the better and provides totalled output values but unfortunately we cannot install the later FW that goes with it.More info and a pic of the latest OSD here:https://www.eevblog.com/forum/testgear/siglent-spd3303x-and-spd3303x-e-power-supplies/msg5548861/#msg5548861

author: low_noise
author_rank: Newbie
timestamp: August 04, 2024, 02:11:25 am
content: much appreciated, thank you for the explanation and the quick response.
121GW windows app fails - Page 1
Forum section: electronics / testgear

author: ivi_yak
author_rank: Regular Contributor
timestamp: May 16, 2024, 11:28:06 am
content: The plot graph is something crazy, how contribute to the windows app?

author: Retro Jack
author_rank: Contributor
timestamp: August 17, 2024, 12:23:18 pm
content: I can't help, but I'm impressed you managed to get the app to work at all! I can't get it running on any platform.
HP/Agilent 548xx - Adding a touch screen to oscilloscope - Page 1
Forum section: electronics / testgear

author: ElBartoME
author_rank: Newbie
timestamp: August 03, 2024, 12:53:24 pm
content: Hey everybody,I recently acquired an Agilent 54825A for cheap as it was deemed broken. It turned out to be an empty CMOS battery. I took that opportunity and upgraded the hardware to a Pentium 3 with 1 GHz and 256MB RAM by swapping the mainboard. I also exchanged the hard drive with a CF-card and updated from Windows 98 FE to Windows 98 SE.I'm pretty happy with the scope but I was always missing a touch screen, as using the scope without a mouse was cumbersome. I went for the hunt for something suitable and I was able to find something.https://www.aliexpress.com/item/33061294663.html?gatewayAdapt=glo2deuYou can find his touch module on many different sites. I personally bought it via Amazon Germany and it got delivered to me for 35€ in 2 days. Unfortunately it didn't come with any drivers as was stated in the description but I was able to dig up Windows 98 drivers which were working. You can download them from here:https://www.tvielectronics.com/ocart/slt-tp05-usbThey also have Windows XP drivers so it can be used with 5483x models as well.The touch module fits PERFECTLY. You have to disassemble the front of the scope (refer to the service manual on how to do that). Remove the screen and the glas in front of it. Put the touch module down and align it. You can then put the glas on top of that and then assemble the screen. Put everything back, connect the module via USB to either an internal USB header or the back USB ports and install the drivers.Go through the calibration routine and that's it. Now you have an old 548xx oscilloscope with a touch screen. Enjoy a lot of fingerprints on the screen from now.I just have to figure out how I can use an onscreen keyboard with Windows 98.