hybridfree/eevblog-posts huggingface dataset:
What can I do with an HP 83751A sweeper? - Page 1
Forum section: electronics / testgear

author: Swake
author_rank: Frequent Contributor
timestamp: November 26, 2022, 09:13:20 pm
content: Hi,Got this HP 83751A 2 - 20 GHz Synthesized Sweeper offered to me.https://www.keysight.com/be/en/product/83751A/synthesized-sweeper-2--20-ghz.htmlI'm not an HF guy and barely understand what it can be used for, but since I have that test equipment addiction.... maybe I should get it....What is such a thing worth today (I mean $€£)? Is it still somewhat actual or would it fall in the totally obsolete category?

author: nexus
author_rank: Regular Contributor
timestamp: November 27, 2022, 07:16:44 am
content: Let see what it can be used for...1. door stop2. space heater3. boat anchorall jokes aside, if you have a spectrum analyzer, you can use it to generate RF signals between 2-20 GHz and do scalar analysis of devices in this frequency range. amplifiers, attenuators, filters, mixers (if you have another LO source). you could also test bandwidth of other test equipment by generating high frequency signals that typical function generator cannot doI would estimate that working 83751A could fetch between 1-3K USD on ebay depending on conditions, options...

author: Swake
author_rank: Frequent Contributor
timestamp: December 02, 2022, 07:21:46 pm
content: Did not acquire it as it has a low band IF error and the asking price is through the roof. It was not worth the risk especially as I have no experience repairing this kind of equipment.

author: coromonadalix
author_rank: Super Contributor
timestamp: December 02, 2022, 07:59:39 pm
content: good decision lollServicing theses can or could be problematic ....I have given an hp synthetized generator to a friend am fm 0-520 Mhz, he had so much troubles to service it, But managed to repair itIt had fallen on a floor, front panel deformed, handles broken, power switch broken, some signal connectors broken, luckily it had some dual frame who saved everything else ...
Tektronix CSA8000 and TDS8000 Instruments Operating System Rebuild CD - Page 1
Forum section: electronics / testgear

author: dannybeckett
author_rank: Contributor
timestamp: April 18, 2022, 08:02:31 pm
content: Hi guys,Does anyone have the operating system CDs (in ISO form) for the Tek 8000 series scopes? I have a TDS 8000 which needs some operating system TLC. Windows 98 or 2000 I think will work.Cheers!

author: dannybeckett
author_rank: Contributor
timestamp: April 20, 2022, 11:03:14 am
content: Future travellers:Win98 image torrent attached

author: super7800
author_rank: Regular Contributor
timestamp: December 02, 2022, 04:03:01 am
content: just bought a TDS8000 without HDD. The torrent doesn't appear to be working. Could someone post a disk image for this instrument? thanks.
Antique Test Equipment Find - Page 1
Forum section: electronics / testgear

author: Terabyte2007
author_rank: Frequent Contributor
timestamp: November 01, 2014, 10:37:46 pm
content: I was out today picking up some supplies from my local surplus when I dug these classic meters up!Triplett Model 666-H VOMSimpson Model 372 Ohm MeterThe Triplett has an HV range to 5K and the unit still works great!Have not tested the Simpson yet.Gonna add these to my classic collection!

author: cncjerry
author_rank: Unknown
timestamp: November 02, 2014, 08:04:45 am
content: I think you need to share the purchase price for it to qualify as a 'find'

author: Terabyte2007
author_rank: Frequent Contributor
timestamp: November 02, 2014, 11:39:48 am
content: Quote from: cncjerry on November 02, 2014, 08:04:45 amHow's $5 (US) for both!

author: cncjerry
author_rank: Unknown
timestamp: November 02, 2014, 04:39:25 pm
content: Scored as a find. I look for those old Simpson meters often. The triplet is cool as well.

author: nanofrog
author_rank: Super Contributor
timestamp: November 03, 2014, 02:45:29 am
content: Quote from: Terabyte2007 on November 02, 2014, 11:39:48 amThat price deserves a huge YOU SUCK!

author: W3KW
author_rank: Contributor
timestamp: August 19, 2022, 04:36:49 pm
content: I paid $40 for my Simpson model 372. It was made in 1963 and is a wreck. What a fun find though. I also bought a brand new model which is back-ordered but will find a place on my bench...because it's a Simpson! So, the discovery and restoration process is so fun! I found an amazing guy at Simpson who sent me the original schematics and has helped my greatly in figuring out the best ways to make this old but fine instrument whole again. Most everything, including the 30v batteries are easy to source. The #4-36 1.5 inch round head brass screws not so much. My new friend at Simpson said he'd check all the junk drawers in the shop and see if he can find some for me. Man I love this hobby. People are amazingly helpful.See attachments.WesW3KW

author: james_s
author_rank: Super Contributor
timestamp: August 19, 2022, 05:48:46 pm
content: Nice finds, I'm glad someone is rescuing these classic instruments. A few years ago I gave away a nice vintage meter similar to the classic Simpson but it was another brand. I think they're cool, but I just don't have the space for more shelf ornaments.

author: W3KW
author_rank: Contributor
timestamp: December 01, 2022, 03:41:38 am
content: Restoration and completion photos for my 372. A very fun and rewarding project.

author: SoundTech-LG
author_rank: Frequent Contributor
timestamp: December 01, 2022, 05:10:05 pm
content: Got one just like this for $0.00 ...https://www.ebay.com/itm/285052156133Needs a bit of battery corrosion clean up.
R&S RT-ZP05S Probe query for RTM3004 Oscilloscope, causing shorts? - Page 1
Forum section: electronics / testgear

author: bsodmike
author_rank: Regular Contributor
timestamp: December 01, 2022, 07:52:51 am
content: Hi all,I'm having a bit of dejavu having decently returned to a project at my bench. Please let me know if there is away to remove the "spring" loaded tips from the Oscilloscope probe end.When making full contact, pushing down, once the tip reaches the bottom, there is an outer sleeve. I'd swear, this is possibly grounded as I've caused 2x inverting buffer ICs to 'fry' as soon as that part of the probe touched my point of interest.Is there a different passive R&S probe I should get instead? < 500 MHz is enough for my daily use.Thanks,Mike.

author: bsodmike
author_rank: Regular Contributor
timestamp: December 01, 2022, 07:58:45 am
content: Found some details here:https://www.tequipment.net/Rohde-&-Schwarz/RT-ZP05S/Standard/Passive-Oscilloscope-Probes/QuoteI'm definitely after that rigid tip. The spring loaded one is a total pain.
Inspection microscope with measurement capabilities - Page 1
Forum section: electronics / testgear

author: danils
author_rank: Contributor
timestamp: November 30, 2022, 09:48:36 am
content: Hi all,So I bought some days ago a Dino-Lite top end USB 3.0 digital microscope with its stand and I had severe compatibility issues with Windows 11 running under parallels on a M1 Mac, in a simple word: nothing did work properly. At the end I sent this overpriced stuff back. (almost 2000 euros)So I am asking advice for something good with measurement capability software. Budget could be around 1000 euros.Use is PCB inspection.Thanks!

author: kripton2035
author_rank: Super Contributor
timestamp: November 30, 2022, 10:51:47 am
content: when you use usb on a mac VM, with hardware devices behind, it's far better to use vmware fusion than parallels...I was unable to connect some usb programmers some times ago, and it worked directly wit h fusion.just my 2 cts.ps: on an m1 mac this could be different as fusion is not completely tested it seems

author: timeandfrequency
author_rank: Frequent Contributor
timestamp: December 05, 2022, 11:50:53 am
content: Hi danils,Maybe you can check out theEAKINS IMX226cam which embeeds a point to point distance and a circle diameter measuring feature. As a standalone device, no computer is required to use it : you just need a monitor with HDMI input and a basic USB mouse.Thisnewer modelfeatures a zoom control, additional measuring, recording and picture comparison tools and seems not to require any external lens.
GW Instek GPD-3303S channel 1 output voltage issues - Page 1
Forum section: electronics / testgear

author: nikhilji
author_rank: Newbie
timestamp: September 05, 2022, 06:55:13 am
content: Newbie here. Need some troubleshooting help. I have a GW Instek GPD-3303S that started giving me some trouble. when I press the output button for a preset voltage/current for channel 1, channel 1 goes to 0V, 0A. Any idea why this is happening? The other channel works just fine. I don't see the OV LED coming on either. I might be missing something very trivial, but appreciate any help with troubleshooting this. Thanks!

author: electr_peter
author_rank: Unknown
timestamp: September 05, 2022, 08:44:11 pm
content: What voltage and current setting is for channel 1? Does it go into CC (constant current) mode? If current is set to a low value, it is possible to have 0V 0A on display in CC mode.Also, try measuring both output voltage and current on channel 1 with external multimeter. What values do you get?

author: nikhilji
author_rank: Newbie
timestamp: September 09, 2022, 05:29:34 am
content: Thank you for your response. Turned out the fuse for the channel 1 was blown. These fuses are the axial leaded types so I didn’t behave them in my parts bin. Waiting for the fuse to arrive in the mail. Hopefully nothing else is blown that caused the fuse to blow in the first place.

author: nikhilji
author_rank: Newbie
timestamp: September 13, 2022, 05:38:37 am
content: Fuse F101 keeps blowing. I posted the schematic below. I checked c101 electrolytic cap - seems to show the correct value on my MM." alt="" class="bbc_img" />What else should I be checking? Any troubleshooting help is appreciated. Thanks!

author: srb1954
author_rank: Super Contributor
timestamp: September 13, 2022, 06:04:46 am
content: Quote from: nikhilji on September 13, 2022, 05:38:37 am

author: nctnico
author_rank: Super Contributor
timestamp: September 13, 2022, 05:19:08 pm
content: The bridge rectifier is the first suspect. It is not uncommon for these to fail.

author: uoemx
author_rank: Contributor
timestamp: November 30, 2022, 06:16:56 am
content: Hi! Can you read the firmware your power supply sent me? I messed up my Gwinstek GPD-3303S power supply firmware. Now it doesn't have a bootloader so I can't update the firmware. The situation is that after calibrating the power supply, the voltage displayed is correct, but the current jumps around, and before when the bootloader was still usable, the power supply was ok.Here is the firmware I read from my power supply via SPI protocol with the Xgecu T48 loader and the firmware that does not contain the bootloader I obtained from gwinstekhttps://www.mediafire.com/folder/fait4ybtpixpi/Gwinstel_GPD-3303SThanks so much!!
Replacement Knob for Gwinstek GPD-3303S - Page 1
Forum section: electronics / testgear

author: JenniferG
author_rank: Frequent Contributor
timestamp: November 29, 2022, 07:33:13 am
content: For some reason I'm missing a knob to my GPD-3303S. It was sitting on the shelf for a while and it's just not there now lol. I have no clue what happened to it and looked all over the place for it.It's some sort of special D shaft or something. I tried another D shaft knob and it wouldn't fit.Any ideas what knobs I can buy for this that would look decent. I can't seem to find replacement parts for it so probably will want to replace both knobs.

author: xmris
author_rank: Contributor
timestamp: November 29, 2022, 11:11:29 am
content: I think first of all is to measure the diameter of the shaft. As I can see on UK Farnell, there are various in the range of around 6mm.

author: coromonadalix
author_rank: Super Contributor
timestamp: November 29, 2022, 12:45:19 pm
content: with the known hole diameter, you could find knobs with set screws ??

author: Adrian_Arg.
author_rank: Frequent Contributor
timestamp: November 30, 2022, 12:04:32 am
content: some friend, with a 3d printer:-//
Looking for Wavetek 52A maintenance manual - Page 1
Forum section: electronics / testgear

author: fenugrec
author_rank: Frequent Contributor
timestamp: December 02, 2022, 05:22:10 pm
content: Wavetek 52 Operator's manual is easy to find, but the Maintenance manual is nearly inexistant. One copy on ebay but I'm not that desperate yet; would prefer a PDF.Thanks !
Jaycar selling rebadged Hantek - Page 1
Forum section: electronics / testgear

author: robbie1949
author_rank: Newbie
timestamp: November 29, 2022, 04:30:13 am
content: It seems Jaycar are selling a re-badge Hantek DSO2D10 as a QC1938 with a huge markup

author: tautech
author_rank: Super Contributor
timestamp: November 29, 2022, 06:38:12 am
content: Quote from: robbie1949 on November 29, 2022, 04:30:13 amHardly surprising as for years they sold rebadged Siglents hundreds of dollars more expensive than us.Pretty normal behaviour for Jaycar.

author: DavidAlfa
author_rank: Super Contributor
timestamp: November 29, 2022, 06:46:14 am
content: Interesting.Perhabs, being a non-chinese company, GPL source code could be obtained more easily, just like it happened with Wolcraft?Edit: Had a look at their manual. The terrible font seems to have been fixed, also they are showing the GPL license and the software used, so I sent an email asking for the source code.

author: pcprogrammer
author_rank: Super Contributor
timestamp: November 29, 2022, 06:52:37 am
content: What good does that bring. You need the FPGA programming and the actual scope code to make a difference, because that is where the real bugs are.

author: DavidAlfa
author_rank: Super Contributor
timestamp: November 29, 2022, 01:23:22 pm
content: Having the kernel sources is still very interesting, for example tonadd networking support, adding usb-ethernet gadget.Who knows!

author: voltsandjolts
author_rank: Unknown
timestamp: November 29, 2022, 01:46:13 pm
content: Requesting the GPL source is an interesting exercise, if only to determine the professionalism of the vendor.Some years ago I requested the GPL source for the 8846A from Fluke - they actually DHL'd a DVD from the US to the UK, a download link would have sufficed!

author: Altemir
author_rank: Contributor
timestamp: November 29, 2022, 09:04:18 pm
content: https://www.siliconchip.com.au/Issue/2022/December/Jaycar+QC1938+Oscilloscope- page 48

author: David Aurora
author_rank: Frequent Contributor
timestamp: November 29, 2022, 10:03:45 pm
content: Yeah this is basically what Jaycar do. Any product you can find there is gonna be for sale online under a different name for a fraction of the cost.I guess one upshot of that though is that Jaycar stocking it is like an inverted quality assurance stamp- if they sell it, it is absolutely, 100% guaranteed to be poorly designed and/or manufactured.
andonstar ad106s or Microscopio Digital de 51MP 1080P FHD 150X  - Page 1
Forum section: electronics / testgear

author: Adrian_Arg.
author_rank: Frequent Contributor
timestamp: November 29, 2022, 05:16:35 pm
content: hello, does anyone use this andonstar ad106s microscope for electronic welding? I have to solder wires in, for example, the esp-01 chip and with a magnifying glass I'm going crazy, in Argentina I can get this at a more or less affordable price, and if not go for it on aliexpress 51MP 1080P FHD 150X Digital Microscopelinkhttps://es.aliexpress.com/item/1005004308740171.html?spm=a2g0o.cart.0.0.70027a9dCfH7B3&mp=1&gatewayAdapt=glo2engYour comments would really help me since I don't know which one to go for.in spanishhola alguien usa este microscopio andonstar ad106s para soldadura en electronica? tengo que soldar alambres en por ejemple el chip del esp-01 y con lupa me estoy volviendo loco, en argentina consigo este a un precio mas o menos accible, y si no ir por este en aliexpress Microscopio Digital de 51MP 1080P FHD 150Xlinkhttps://es.aliexpress.com/item/1005004308740171.html?spm=a2g0o.cart.0.0.70027a9dCfH7B3&mp=1&gatewayAdapt=glo2espla verdad me serviria sus comentarios ya que no se por cual ir.
Problem generating Rigol Bundle 'download' from License Key and S/N - Page 1
Forum section: electronics / testgear

author: 6SN7WGTB
author_rank: Regular Contributor
timestamp: November 30, 2022, 08:48:39 am
content: Have a Rigol MSO5xxx and it came with a software bundle, all official.Going to the Rigol license website:http://licenseen.rigol.com/CustomerService/ProductRight_ENAnd entering my bundle key in the XXXX-XXXX-XXXX-XXXX and 'scope S/N I get an error:"Query error, please contact RIGOL"If I try again, unsurprisingly I get a different error as it now believes the key is bound to a device:"key used in other sn"Has anyone else had this?Safari 16.1, MacOSX 12.6.1 - and no, I don't want to use Firefox or Chrome...

author: tautech
author_rank: Super Contributor
timestamp: November 30, 2022, 09:03:19 am
content: Quote from: 6SN7WGTB on November 30, 2022, 08:48:39 amSounds like the license key has already been redeemed for another instrument.

author: 6SN7WGTB
author_rank: Regular Contributor
timestamp: November 30, 2022, 09:08:50 am
content: Sounds like the license key has already been redeemed for another instrument.I would have said so, yet this is the second key they've given me...

author: RoGeorge
author_rank: Super Contributor
timestamp: November 30, 2022, 10:31:47 am
content: IIRC you should only introduce the characters, without any dashes '-' or space separators.

author: 6SN7WGTB
author_rank: Regular Contributor
timestamp: November 30, 2022, 10:55:06 am
content: The website doesn't allow the "-" to be added, you just type the numbers/letters and it 'auto jumps' from each 4-character box to the next, with the dash hard-coded in the page.

author: mwb1100
author_rank: Frequent Contributor
timestamp: November 30, 2022, 11:07:07 am
content: I had a different problem getting my bundle keys from that website (it just seemed to not do anything at all when I clicked submit). I sent an email to support and got it sorted in a day or two.
Irresistable cyber monday deal at the Aneng store - Page 1
Forum section: electronics / testgear

author: Fungus
author_rank: Super Contributor
timestamp: November 28, 2022, 03:38:06 pm
content: For a limited time only you can get a €4.95 discount if you spend €356.18 at the Aneng store.I'll see you all there...

author: BillyO
author_rank: Super Contributor
timestamp: November 28, 2022, 03:39:03 pm
content: Quote from: Fungus on November 28, 2022, 03:38:06 pm

author: RoGeorge
author_rank: Super Contributor
timestamp: November 28, 2022, 04:22:23 pm
content: OTOH, when one offers 50% discount it can only mean one thing: that it has been always a heavily overpriced product, except maybe during that 50% sales offer.Can also mean the prices were doubled just before the sales day by the seller.Or it can be a bankruptcy sale, or else 50% discount wouldn't make sense.

author: coromonadalix
author_rank: Super Contributor
timestamp: November 28, 2022, 04:37:13 pm
content: They love playing with numbers, and this rebate is a joke ... Amazon does that too loll
HANTEK DDS3X25 - Page 1
Forum section: electronics / testgear

author: nello77
author_rank: Newbie
timestamp: November 28, 2022, 09:43:02 pm
content: Ciao a tuti, cortesemente avrei bisogno di aiuto su questo argomento : anni fa ho acquistato un generatore hantek dds 3x25. con il nuovo PC e con windows 11 non viene riconosciuto. qualcuno sa per cortesia dirmi dove trovare i nuovi driver. anni fa e stata fata la stessa domanda ma per windows 10 . grazie a tutti , nello.

author: tautech
author_rank: Super Contributor
timestamp: November 28, 2022, 09:50:38 pm
content: Welcome.This is an English only forum so please translate before posting.
wich oscilloscope is better - Page 1
Forum section: electronics / testgear

author: ُSTP.Asghari
author_rank: Newbie
timestamp: November 28, 2022, 06:17:23 am
content: Hi everyoneI want to buy an oscilloscope. I have two models in mind. One is the FNIRSI 1014D model and the other is the HANTEK-DSO-2C10 model. Which one do you think is better? Is the first model a good model and is it worth buying?The specifications of these two oscilloscopes are explained in the following links:https://www.tme.eu/en/details/dso2c10/digital-oscilloscopes/hantek/https://www.amazon.com/FNIRSI-1014D-Dual-Channel-Oscilloscope-Generator-Bandwidth/dp/B097T5NRTZ

author: pcprogrammer
author_rank: Super Contributor
timestamp: November 28, 2022, 06:24:31 am
content: Of the two you mention the Hantek is the better one, and it is not telling lies about what it can do.The FNIRSI 1014D is only 200MSa/s per channel and the bandwidth is <30MHz instead of the advertised 100MHz.There are several threads about these scopes here on the forum.https://www.eevblog.com/forum/testgear/new-bench-scope-fnirsi-1014d-7-1gsas/https://www.eevblog.com/forum/testgear/new-hantek-dso2x1x-models/Use the search function to find more.

author: Fungus
author_rank: Super Contributor
timestamp: November 28, 2022, 11:53:22 am
content: Quote from: pcprogrammer on November 28, 2022, 06:24:31 amIt's also twice the price, so...It's also scarily close to a Rigol DS1202Z-E, which is amuchbetter oscilloscope.https://www.amazon.com/stores/page/6AADF13C-8199-4DD1-B005-EF61540C3457

author: pcprogrammer
author_rank: Super Contributor
timestamp: November 28, 2022, 12:06:28 pm
content: Quote from: Fungus on November 28, 2022, 11:53:22 amNot when I bought themFor me they are both hobby projects. Got better ones for the real work.
RS-135 4-20mA Loop Calibrator & Thermometer - Page 1
Forum section: electronics / testgear

author: mcinque
author_rank: Unknown
timestamp: August 11, 2022, 09:29:14 am
content: Hello all!I would like to acquire a voltage/current/loop calibrator and I found the "PROVA 135 4-20mA Loop Calibrator & Thermometer"https://www.prova.com.tw/product_detail.asp?seq=198It's rebranded by RS with code RS-135https://uk.rs-online.com/web/p/multi-function-calibrators/1749557I don't know much about this 'PROVA' brand and I don't know how they build their products... does anyone have this type of calibrator and has done a teardown and/or can tell if it's a good product?

author: Chance92
author_rank: Regular Contributor
timestamp: November 27, 2022, 03:31:49 am
content: I had a second-hand RS-133. Here's the only picture I could find. I replaced the battery pack myself. Not very good at this kind of things. Please don't judge the workmanship. It worked fine in general. I remember the measurement function was lightning fast and steady. Very impressive. One thing I don't like is the manual didn't mention the calibration procedure, so you might need to send it back to the factory to get it calibrated.There's another PCB under the one you can see. There's a switch-mode DC-DC converter at the upper right corner, which I suppose powers the system, and there's another one at the bottom. You can see the inductor there. I think this is probably used to generate the output voltage. Not sure if it's a good idea to put a smps so close to the output ports. I couldn't find the voltage reference chip. It might be under the copper shield, but I didn't open it. Another thing I could remember is that the calibrator couldn't charge while turned off, which is very strange.

author: mcinque
author_rank: Unknown
timestamp: November 28, 2022, 07:54:41 am
content: Thanks a lot! The kapton I see is something factory made or is something made by you changing the battery?

author: Chance92
author_rank: Regular Contributor
timestamp: November 28, 2022, 03:36:30 pm
content: That was added by me.
Is this oscilloscope a great deal? 250Mhz 4 channel for $~550? - Page 1
Forum section: electronics / testgear

author: SimSama
author_rank: Newbie
timestamp: November 28, 2022, 06:11:39 am
content: Its probably obvious but I'm a noob looking to buy my first scope. I've watched Dave's vids on scopes for entry level, and see him recommending mostly 50Mhz 4 channel scopes. I noticed this one at 250Mhz / 4 channel for relatively cheap.Can anyone pick this apart or confirm it is a good deal?4 Channels Hantek DSO4254B Digital Oscilloscope,1GS/s Sample Rate 250MHz LCD Desktop OscilloscopeModel: DSO4254BBandwidth: 250MHzSample Rate Range: 1GS/sRecord Length: Maximum 64K samples per single-channel; Maximum 32K samples per dual-channel (4K, 32K optional)SEC/DIV Range: 2ns/div~100s/div; 1, 2, 5 sequenceAD Converter: 8-bit resolution, each channel sampled simultaneouslyPosition Range: 500μV/div~20mV/div, ±400mV; 50mV/div~200mV/div, ±2V; 500mV/div~2V/div, ±40V; 5V/div~10V/div, ±50VRise Time at BNC, typical: <1.4nsDC Gain Accuracy: ±3% for Normal or Average acquisition mode, 10V/div to 10mV/div; ±4% for Normal or Average acquisition mode, 5mV/div to 500μV/divAcquisition Modes: Normal, Peak Detect, Average and HRLink to scope:https://www.amazon.com/Channels-Hantek-DSO4254B-Digital-Oscilloscope/dp/B0914VF19Z

author: pcprogrammer
author_rank: Super Contributor
timestamp: November 28, 2022, 06:26:59 am
content: For that money you can get better scopes from Rigol, Siglent or GW-Instek.

author: jonpaul
author_rank: Super Contributor
timestamp: November 28, 2022, 06:58:29 am
content: Tektronix 2465B 350 MHz 4 ch 2467B 400 MHz ~ $300..500Jon

author: Fungus
author_rank: Super Contributor
timestamp: November 28, 2022, 07:15:27 am
content: Not a good deal.250MHz sounds impressive but 1GS/sec isn't enough to sample 4 channels correctly (it breaks the Nyquist limit). 1Gs/sec is really only enough for 100MHz@4 channels.64k samples is also pathetic. Most entry level 'scopes measure samples in tens of megabytes these days.Quote from: SimSama on November 28, 2022, 06:11:39 amThose 'scopes can be unlocked to 100Mhz or more for free.100Mhz is plenty for a beginner 'scope. Once you go much above that you start to have big problems with probing. Even at 200Mhz you can't simply poke your probe at a component and expect to see a good signal.

author: 2N3055
author_rank: Super Contributor
timestamp: November 28, 2022, 08:30:46 am
content: For less than 500$ you can get a 4 channel scope that has 2x1GS/s (it has 2 ADC) and will go to 200Mhz for real. And is also more advanced and better product.
Panasonic VP-7722A : looking for Service Manual - Page 1
Forum section: electronics / testgear

author: psykok
author_rank: Frequent Contributor
timestamp: August 02, 2020, 08:15:43 pm
content: Hi,I scored a Panasonic VP-7722A Audio Analyzer and I will need the service manual but was not able to found on internet.would someone have a copy of the service manual to share?alex

author: deadlylover
author_rank: Frequent Contributor
timestamp: August 03, 2020, 02:04:43 am
content: Can you chuck me an email over PM later (throwaway fine), I have a copy somewhere, too big to attach here.Was sourced from a few lads at a diy audio forum, make sure to create a post in the repair section on eevblog if you do any repair/mods, these units are quite rare but still reasonably capable today.

author: wichers
author_rank: Newbie
timestamp: August 27, 2020, 06:27:02 pm
content: Here you go:Panasonic VP-7722 Service ManualPanasonic VP-7722 Operation Manual

author: wichers
author_rank: Newbie
timestamp: August 27, 2020, 06:29:51 pm
content: Bought one myself, mine is off needs a new 3.6v battery and caps are bad. I'm going to do a full recap so I OCRed the service manual and copied/corrected the capacitors values into an excel. This might be useful to others as well. Any suggestions or changes on capacitor values are welcome!Kind regards,Alexander

author: LoTech
author_rank: Contributor
timestamp: November 10, 2021, 06:08:25 am
content: this is golden!Thank you for sharing!!Are you done with the recap and calibration? What did you use for the 3.6v battery?

author: Raziel92
author_rank: Contributor
timestamp: January 31, 2022, 01:40:24 am
content: Hello, I have the same audio analyzer and i have problems with tact switches, as I discovered they are integrated with leds, any info where I can order such switches? And details about them?

author: USMC_Spike
author_rank: Regular Contributor
timestamp: November 28, 2022, 12:45:49 am
content: I have a VP-7722a, and some of the front panel push switches tend to stick and not functionproperly until about 1/2 dozen or more times pressing and releasing.any ideas on how to clean/fix these before I attempt it?
Siglent SDL1020X-E Service Manual and/or Calibration Procedure - Page 1
Forum section: electronics / testgear

author: pmendiuk
author_rank: Contributor
timestamp: November 24, 2022, 06:45:19 pm
content: Hey all,Does anyone have the calibration procedure for the Siglent SDL electronic loads? The SDL1020X-E is ok for rough measurements but my OCD tendencies would like the voltage and current measurements to generally agree with the Keithley and Fluke DMMs in the vicinity. I "upgraded" the SDL1020X-E to SDL1030X and the extra digit seems to have limited use other than a random number generator even when connected to my Fluke 343A Voltage Reference.

author: BillyO
author_rank: Super Contributor
timestamp: November 24, 2022, 07:26:18 pm
content: A lot of modern equipment cannot be adjusted by the end user. They are calibrated in a calibration jig (for want of a better word) where the calibration is done automatically and adjustment values are stored in NV-RAM. I'm not sure if the SDL1020X-E falls into this category, but it is likely.Also, my guess is the main difference between the X and X-E models is not in the build or calibration, but in stability and precision. In other words, the X-E are identical to the X except they did not pass the noise and stability specs required to resolve the 4th digit, so the digit is disabled and they are sold as X-E models for less money. Again, I could be wrong but I have worked for companies that do exactly this. For instance microprocessors. There is no difference between an Intel i7 rated at 3GHz and one rated at 3.2GHz of the same generation with the exception that the one rated at 3.2GHz worked within spec at that speed, whereas the 3GHz item did not.

author: pmendiuk
author_rank: Contributor
timestamp: November 24, 2022, 11:40:51 pm
content: Wow,I thought someone out there would have the procedure. I guess I'll generate a lookup table to use with my scripts for now. I hope Siglent will provide the procedure next week.

author: electr_peter
author_rank: Unknown
timestamp: November 25, 2022, 08:55:00 am
content: Quote from: pmendiuk on November 24, 2022, 06:45:19 pmWhy do you expect calibration (if it is even possible by user) to do anything about jumping digits?Is DC load accurate otherwise?

author: pmendiuk
author_rank: Contributor
timestamp: November 27, 2022, 09:01:58 pm
content: I'm aware calibration won't do anything about the jumping digits. I want to calibrate to remove a small voltage offset.The offset and jumping digits seemed to be worse after upgrading to the SDL1030X setting. I switched to remote sensing and changed the averaging setting and it calmed down.
Flatness adjustment not possible any more on hP / Agilent 8564E - Page 1
Forum section: electronics / testgear

author: hafrse
author_rank: Regular Contributor
timestamp: December 01, 2022, 08:33:27 am
content: Hello,I am trying to adjust the flatness on my 8564E but did not work:If I choose a band #3 and try to adjust the DAC at the specific frequency 12.4Ghz , previous DAC value was 3501 , if I change to 3256 and can see the trace within the flatness menus at the wanted level , save and exit.Now measuring the same frequency @12.4Ghz still shows level value which was on DAC 3501! going back to the flatness cal menu and set back band #3 12.4Ghz , the level is correct within that menu and the DAC value is 3256 (the new value) .I tried values like 100 and 4995 , DAC value will be saved but trace still the same at 12.4Ghz. any clue what that can be?However, in the low band mixer (9kHz-3GHz) it is possible to adjust and see the results without any problems.Where do I find the flatness compensation DAC ?Thanks for any advice!George
Looking for Tesla BS 340 electron microscope schematics, manuals, docs - Page 1
Forum section: electronics / testgear

author: Spirit532
author_rank: Frequent Contributor
timestamp: November 27, 2022, 12:12:50 pm
content: I'm looking foranydocumentation, written/scans/photos/whatever for the Tesla BS 340 SEM, in any language. Specifically the340, not the 300 or 350. This is a long shot, but might as well post here.Will send some coin to whoever can help.Post here, PM, email eevblog_tesla@spirit.re, anything works.
Hantek 2D42 maximum output voltage - Page 1
Forum section: electronics / testgear

author: hexreader
author_rank: Frequent Contributor
timestamp: November 25, 2022, 05:51:06 pm
content: I am thinking of buying Hantek 2D42 scope/function generatorYes I know it is old, cheap and nasty, but may be just what I wantQuestion is:Can the function generator output TTL level square waves high 5V, low zero volts?Spec says 5Vpp and 50 Ohms output, so I am hoping that it can produce +5V unterminated.My suspicion is that the maximum + voltage is 2.5 VoltsAnybody own a Hantek 2D42 or 2D72 that can tell me what the true maximum plus voltage is please?Googling gives many reviews and much information, but not this one detail

author: gf
author_rank: Super Contributor
timestamp: November 26, 2022, 06:07:06 am
content: -2.5...+2.5V open circuit.-1.15...+1.25V with 50 Ohm load connected.

author: hexreader
author_rank: Frequent Contributor
timestamp: November 26, 2022, 10:58:15 am
content: Many thanks gfYou have saved me from wasting money on something that will not do the jobMuch appreciated

author: hexreader
author_rank: Frequent Contributor
timestamp: November 26, 2022, 03:10:54 pm
content: So next question please...Is there a "nice to use" hand-held function generator under £300 that will generate 1Hz to 10MHz square wave at 5V and 3.3V TTL levels?... or should I build my own function generator? perhaps with PIC and some sort of clever clock generator chip?Any recommendations for through hole clock generator chip that gives good resolution 1Hz to 10MHz?Sorry for unclear ideas.Any ideas will be welcomeHmm.... or should I buy Hantek 2D42 and build battery-powered 2.5V to TTL converter - sounds messy and unpleasantLooking for neat, pleasure-to-use solution, not messy solution
is this a fluke? (117 ghost? current) - Page 1
Forum section: electronics / testgear

author: Anthocyanina
author_rank: Frequent Contributor
timestamp: November 25, 2022, 09:17:32 am
content: I recently got a fluke 117 and I haven't used it much, and when i have, it has only been for circuits using 5v and for continuity, and the day it arrived, i also shorted some AA batteries with it to see the current go up, everything seemed fine afterwards and it was left turned off for a while. today i needed to measure some currents in the order of a few milliamps, and grab it for that, but when turning it on, i encountered this strange thing, it shows 4 mA DC with nothing plugged into any terminal, and when switching to AC current, while it displays 0.000, the first segment of the bargraph flickers on and off.I opened it and took out the fuse, and it still behaved the same way. Then i changed the battery, and it showed 0.000 A on DC but the bargraph still flicked on AC, and after a few minutes, the 4mA started to show up again when on A DC.Any idea what might be going on?Thank you!

author: evava
author_rank: Regular Contributor
timestamp: November 25, 2022, 09:57:56 am
content: I think you should plug in the test leads, then look at display in DC mA range ?(split input terminals)

author: Anthocyanina
author_rank: Frequent Contributor
timestamp: November 25, 2022, 10:12:04 am
content: Quote from: evava on November 25, 2022, 09:57:56 amThanks, I've already tried shorting the terminals with the leads. This meter doesn't have a mA range unfortunately

author: skander36
author_rank: Frequent Contributor
timestamp: November 25, 2022, 10:28:41 am
content: Maybe need calibration? (ofsetting)My fluke 87V also show 2 mA on iddle and I have others that fluctuates on iddle (plus or minus 1-2 mA).

author: Anthocyanina
author_rank: Frequent Contributor
timestamp: November 25, 2022, 10:52:34 am
content: Quote from: skander36 on November 25, 2022, 10:28:41 amThank you, i tested various currents (through a 100 ohm resistor), and it does seem to be a constant offset! I do wonder what caused this offset to appear while it was just sitting there unused for a few days, hmm!

author: Caliaxy
author_rank: Frequent Contributor
timestamp: November 25, 2022, 06:37:23 pm
content: This meter is not intended to measure mA. Keep in mind that you are on the 6A range, trying to measure 10-60 mA (<1% of the full scale). Not to mention the 1% + 3 digits accuracy... It's normal, your Fluke 117 works as it should. Use your Aneng to measure mA.

author: BeBuLamar
author_rank: Super Contributor
timestamp: November 25, 2022, 07:07:07 pm
content: I think you blew the fuse when you shorted the battery. You need to check and see if the fuse is still good.

author: Martin72
author_rank: Super Contributor
timestamp: November 25, 2022, 10:31:18 pm
content: Quote from: Caliaxy on November 25, 2022, 06:37:23 pmExactly this, we got several of them here, but we don´t use them for mA measures.
Tablets: Micsig vs Owon - Page 1
Forum section: electronics / testgear

author: balnazzar
author_rank: Frequent Contributor
timestamp: October 23, 2022, 02:57:55 pm
content: Micsig is quite popular amongst tablet scopes' estimators, while Owon is not.Same 8" 4:3 screen, same price, more or less.It seems to me that Owon has some advantages. Consider that Micsig is often criticized for not having statistics and pass/fail. Owon has them both (see picture below). And, it's 12-14 bit modes can be somewhat useful, even with the known limitations.I have no information about fan noise (if they have a fan) and other aspects.

author: DaneLaw
author_rank: Frequent Contributor
timestamp: October 23, 2022, 04:02:08 pm
content: You can find the answers and get a good insight in the Micsig threads.and maybe refer to models, as they are not the same.. Micsig has quite a few 8" models ATO, TO & the STO-1000, STO-1000C, STO-1000E, STO-2000C series, .. some have 2 fans if I recall (ATO/TO), and some have 1 bigger fan STO/C/E and the "fan" are off quite a bit of the time, at least in the STO-series here in a colder climate like northern Europe.Some older models run on Linux and the newer models run on Android.

author: scoper007
author_rank: Contributor
timestamp: November 25, 2022, 07:33:17 am
content: Quote from: balnazzar on October 23, 2022, 02:57:55 pmJust found this on my upgraded Micsig TO3004, Statics? LOL.

author: balnazzar
author_rank: Frequent Contributor
timestamp: November 25, 2022, 12:51:55 pm
content: Mh, this is quite something. So they added statistics to all their scopes??

author: 2N3055
author_rank: Super Contributor
timestamp: November 25, 2022, 01:12:23 pm
content: Quote from: scoper007 on November 25, 2022, 07:33:17 amAnd now they backport this to my STO100C and all existing models. I won't be buying anything from them until they do that. I don't like that they seem to have abandoned scopes that they have been selling until few months ago. Statistics is basic stuff, some of the handheld scopes for 100$ have it...

author: skander36
author_rank: Frequent Contributor
timestamp: November 25, 2022, 01:20:16 pm
content: Quote from: balnazzar on November 25, 2022, 12:51:55 pmNo. On STO 1000C series is not present. Why ? Is just a software matter .
KS MSOX3000T push for 50% trigger strange behavior/bug - Page 1
Forum section: electronics / testgear

author: electr_peter
author_rank: Unknown
timestamp: November 23, 2022, 01:22:04 pm
content: Pushing trigger level knob for "Push for 50%" functionality works a bit strange on Keysight MSOX3000T. With only one channel enabled and in auto run mode, pushing trigger knob results in momentary turn on of all analog channels (channel buttons light up briefly), momentary display all analog traces on screen, momentary drop in sample rate (due to all channels enabled) and finally 50% trigger setting for enabled channel. Other channels remain turned-off, turn-on is only for a brief moment.Is this expected behavior or a bug? User manual states 50% action is valid only for displayed channelsQuote

author: tautech
author_rank: Super Contributor
timestamp: November 23, 2022, 07:46:08 pm
content: Have you done a Default on the chance some hidden settings made it behave this way ?To be fair you should state the firmware version installed.

author: 2N3055
author_rank: Super Contributor
timestamp: November 23, 2022, 10:26:30 pm
content: Yes that is how it works.. Why, I have no idea. It doesn't matter though, because it is quick and does it's job.

author: electr_peter
author_rank: Unknown
timestamp: November 24, 2022, 04:22:03 pm
content: FW version 7.55.20220718 (released on 2022-07-29). Same behavior was noticed after "Default Setup", also with various analog channel combinations. Not every time other channel traces are shown on screen, but left side axis goes through other colors every time. This is not a bug IMO.It seems that "Push For 50%" functionality is a subset of "Auto Scale" functionality. Presumably you want the scope to setup itself based on input signals, so "Push For 50%" configures all analog channels triggers to middle of the waveform (so that if trigger source is changed, scope still triggers), irrespective if other channels are turned on or off.KS manualshouldread:Quote

author: HighVoltage
author_rank: Super Contributor
timestamp: November 25, 2022, 09:34:57 am
content: My MSOX4000 does the same.So this seems to be a normal behavior for these Keysight scopes.
siglent sdg830 behavior - Page 1
Forum section: electronics / testgear

author: arivel
author_rank: Regular Contributor
timestamp: November 23, 2022, 05:00:32 pm
content: Hello.for reasons that I am not going to specify in detail , I find myself having to use a different and much more recent and modern function generator than the one I have always used , it is a silent sdg830 .for demonstrative purposes I have built a simple rectifier circuit with a 4 diode bridge fed by a sinusoidal signal coming from the function generator.what appears on the oscilloscope is not what it should be because only one half-wave is seen and not both rectified.can someone explain me why?

author: tautech
author_rank: Super Contributor
timestamp: November 23, 2022, 07:32:27 pm
content: Quote from: arivel on November 23, 2022, 05:00:32 pmA dud bridge or you've created a ground loop.Try the measurement again with a differential probe.

author: arivel
author_rank: Regular Contributor
timestamp: November 24, 2022, 10:43:23 am
content: with a transformer I see in the right way, I don't understand why with sdg830 instead not

author: rf-loop
author_rank: Super Contributor
timestamp: November 24, 2022, 01:11:01 pm
content: Quote from: arivel on November 24, 2022, 10:43:23 amFor educational purpose, please first draw schematic about your circuit. Generator in left then bridge and right oscilloscope input.Draw it using pen and paper and also do not forget draw all routes where current flow. Including also both instruments GND. After then think.You can also take picture about your schematic and display it here.

author: arivel
author_rank: Regular Contributor
timestamp: November 24, 2022, 06:48:35 pm
content: I also tried with an integrated diode bridge but the result does not change.I think there is some strange setting in the function generator

author: tautech
author_rank: Super Contributor
timestamp: November 24, 2022, 06:56:24 pm
content: Quote from: arivel on November 24, 2022, 06:48:35 pmStop and take a minute to consider the normal connection you might do for this.Than ask which connection points are common, then consider what they might also be in common with.

author: rf-loop
author_rank: Super Contributor
timestamp: November 25, 2022, 06:04:42 am
content: Quote from: tautech on November 24, 2022, 06:56:24 pmPlease read my last post and follow it to stop your circular thinking. Now you just repeat your test over and over without bothering to solve the problem.(I naturally assume that you are using both devices according to their instructionsboth connected to a protectively grounded power source.Think what that means... (since (I assume) you are using a normal oscilloscope probe and not a differential probe isolated from GND)If you read my previous post and follow it, you will have solved this problem in less than a half minute without any more repeating the same test and wandering your mind on everything else but not the root problem itself.)
Narda PMM 9010 9060 fiber cable - Page 1
Forum section: electronics / testgear

author: wilhe_jo
author_rank: Regular Contributor
timestamp: November 24, 2022, 02:37:33 pm
content: Hi!Anyone out there knows what kind of connector&cable they use on the PMM9010 and 9060?It's square, about 8x5mm, duplex (at least the product photo shows 2 red fibers and a black connector) and the socket looks kind of RJ45...but smaller.Support's more interested in why I didn't got the cable with my units.... well... it was quite a score...Regards

author: wilhe_jo
author_rank: Regular Contributor
timestamp: November 24, 2022, 03:13:26 pm
content: Well, I was too curious and opted to open up the PMM 9060 to see if there's some obvious marking in there....In there is a HFBR-5912EZ transceiver by Avago.The datasheet is available everywhere and has everthing in it.So some length of 62.5/125μm or 50/125µm multi-mode fiber with MT-RJ connector it isNow it's just a matter of finding some source... seems to be pretty exotic nowadays...73
Inside the $50 Tekpower UT61E - Page 1
Forum section: electronics / testgear

author: JenniferG
author_rank: Frequent Contributor
timestamp: November 24, 2022, 07:06:49 am
content: I bought this off ebay a couple days back:https://www.ebay.com/itm/165010229698Here's a photo I just snapped after opening it. Seems legit.. Notice anything peculiar? -- I don't. The seller on ebay said it was the same meter, made in same factory, just different silkscreen for brand logo.The leads are crap though, and I don't think these are the ones that come with the Uni-T branded probes; the tips are literally as long as the tip of a ball point pen.. and the plastic ends flex like crazy.It also came with a dead non-alkaline 9V battery.

author: Gyro
author_rank: Super Contributor
timestamp: November 24, 2022, 11:48:56 am
content: Yes, comparing against my photo collection, that looks like a standard Uni-T UT61E (non EU version) meter.You might want to look at some of Joe Smith's videos on it. He gives strict warnings about not coppying his surge withstand modifications, but he does also covers things like replacing the cal pot (responsible for won't hold cal type posts) with a genuine Bournes, improving cal resolution, improving temperature coefficient etc. I've also copied his ESD sensitivity mod (my own dire warning applies, but that one seems pretty benign).https://www.youtube.com/channel/UCsK99WXk9VhcghnAauTBsbg/videosThere's also the mega UT61E thread somewhere. [EDIT:https://www.eevblog.com/forum/testgear/uni-t-ut61e-multimeter-teardown-photos/]

author: JenniferG
author_rank: Frequent Contributor
timestamp: November 24, 2022, 02:11:26 pm
content: Is that blue trim pot the only pot for calibrating this meter? What are VR2, VR3, VR4, VR5, CW1 and CW2 for? I'll try looking for some examples how to calibrate this.

author: tunk
author_rank: Super Contributor
timestamp: November 24, 2022, 02:29:02 pm
content: There's also a review and teardown of the Uni-T here:https://lygte-info.dk/review/DMMUNI-T%20UT61E%20UK.html

author: Gyro
author_rank: Super Contributor
timestamp: November 24, 2022, 02:42:29 pm
content: Quote from: JenniferG on November 24, 2022, 02:11:26 pmThe Blue multiturn pot is for basic DC range accuracy (Vref). The other pots are trims for AC ranges, 10A range, capacitance etc. They're all marked on the silkscreen. The CWs are for AC range frequency response. [EDIT: They are all factory set and don't need messing with]. The multiturn pot is the one that is a cheap clone and worth replacing with a genuine Bournes.It's worth reading the ES51922 datasheet [and the UT61E schematic]. No EEPROM to worry about on this one!