hybridfree/eevblog-posts huggingface dataset:
Dual Rack Mount Kits - Keithley? - Page 1
Forum section: electronics / testgear

author: Wil_Bloodworth
author_rank: Regular Contributor
timestamp: February 28, 2024, 09:41:18 pm
content: I'm looking to mount a Keithley DMM6500 and a Keithley 2231A-30-3 DC power supply together in the same 3U rack space... exactly the way these two Siglent devices are arranged in this photo:Two questions... 1) Does Keithley make a kit for these two to go side-by-side (assuming they fit correctly)? 2) Does anyone know if the Siglent kit above will work with the Keithley instruments?Thank you!- Wil

author: TimFox
author_rank: Super Contributor
timestamp: February 28, 2024, 11:16:41 pm
content: 3U (5.25 inch) or 2U (3.5 inch)?

author: Wil_Bloodworth
author_rank: Regular Contributor
timestamp: February 28, 2024, 11:17:38 pm
content: 3U if I'm not mistaken.EDIT: According to this page (https://www.tek.com/en/documents/product-selector-guide/keithley-rack-mount-kits-selector-guide), it might be 2U. Model 4299-9$400 for just a bracket is... well, effing stupid!https://www.testequity.com/product/25973-1-4299-9- Wil
(Resolved) Frozen focus pot om Tek 465B - Page 1
Forum section: electronics / testgear

author: Barnzy
author_rank: Newbie
timestamp: February 27, 2024, 05:44:34 pm
content: Hello all,I have an issue with a frozen focus pot on a 465B. (R4132). I have seen in other posts here that some have had good results using deoxit on them.I will try this when I get some. I am curious if this does not work, is there a replacement for it that is still in production. i was quoted $555 US froma surplus supply. Crazy.Picture posted[Thanks

author: med6753
author_rank: Super Contributor
timestamp: February 27, 2024, 07:56:39 pm
content: That's a common issue on those scopes and yes....careful application of Deoxit will free it up.

author: Wallace Gasiewicz
author_rank: Super Contributor
timestamp: February 27, 2024, 11:35:11 pm
content: I did not check for your part but this Canadian Source has lots of Tek and HP Parts, good prices..https://www.sphere.bc.ca/oldsite/test/tek-parts/tekpots.htmlOtherwise there are 5 Meg pots on ebay in US

author: bdunham7
author_rank: Super Contributor
timestamp: February 27, 2024, 11:54:30 pm
content: I believe this is your potentiometer, not $555 but still not cheap:https://www.onlinecomponents.com/en/honeywell/381n5meg-44003668.htmlQ-Service and Sphere list them but show zero stock. One sold on eBay a few days ago, but I don't see any currently.

author: Barnzy
author_rank: Newbie
timestamp: February 28, 2024, 05:35:59 pm
content: Appreciate the feedback. I did check the Canadian parts source as suggested. They have the pot listed but it’s sold out. Too bad since it was listed for under 10 bucks Canadian.Onlinecomponents in the US have these. I’ve ordered it. $32 US. But delivery to Canada , if order is under 100 dollars is subject to a service charge equal to the difference between cost of product and minimum order of $100 when shipping outside the US. In addition another $40 for shipping. Geez.It just so happens, I am going to be in Florida next week visiting friends. I am having it delivered there. No added surcharge since its now a domestic order and only 9 bucks UPS freight.Thanks for all the help.
Simple fan replacement for DHO800/900 - Page 1
Forum section: electronics / testgear

author: jsobell
author_rank: Contributor
timestamp: February 28, 2024, 10:35:47 am
content: When I received my scope I wasn't surprised to hear the fan was loud, as it was reported by Dave in his videos, but after an hour or two my fan died and would only spin up if I flicked it around.So I decided to replace it, and in my stock I found a 40mm double-ball bearing fan. It turns out that these are much quieter than the stock one, and result in an adequate level of cooling.The issue is that these fans are not available caseless, so some modification is required.After cutting off the case I tried just trapping the end of the three legs under the screws, but it's not dependable, so I generated a simple 3D print that can be used as a mount. You simply cut the legs off the fan completely down to the body, apply a dot of your favorite glue into the 3D print, and stick the fan in there, guiding the wires behind the small wire cover. This then screws in using the existing screws, and using the fans I bought results in a fairly quiet solution.My 3D model was made for the fans I sourced from AliExpress, as they only took a few days to arrive.The fans I use are here:https://www.aliexpress.com/item/1005001695012637.html, and are the 12V Ball 6500RPM model, at AU$14 for two.I uploaded the 3D part to printables.com athttps://www.printables.com/model/785002-rigol-dho800dho900-fan-adapter.If anyone wants access to the original 3D model to adapt it for any other fans, just drop me a line and I'll share it out.
Looking for Fluke PM6685 frequency counter service manual (1st generation) - Page 1
Forum section: electronics / testgear

author: prutser
author_rank: Regular Contributor
timestamp: February 29, 2024, 07:58:44 pm
content: All service manuals I could find on the web are a "complementary service manual" for a newer mainboard.I am searching for the original (4822 872 25012, publishing date, June 1996) service manual.Anyone an idea where to get it ?Thanks,
What happened to Topward? - Page 1
Forum section: electronics / testgear

author: whipaway
author_rank: Contributor
timestamp: January 28, 2024, 11:42:43 am
content: What happened to Topward?Their site has been down for a while now.I really liked their power supplies.https://www.topward.com/sitemap.htm

author: Zenith
author_rank: Frequent Contributor
timestamp: February 27, 2024, 05:17:19 am
content: I was looking for a Topward manual a few months or so back. I'm not entirely sure, but I believe they've gone out of business. An active business wouldn't have its website down for months.The US distributor's website is here.http://spencetek.com/Default.htmThe only products listed are power supplies and analogue function generators. Searching with Google produces other pages, not accessible from the current site, with many more products, such as oscilloscopes and LCR meters.http://spencetek.com/7025a.htmIt gives the impression that the distributor is selling off the stock they've got and winding down.

author: Jeroen3
author_rank: Super Contributor
timestamp: February 27, 2024, 08:26:25 am
content: The domain is owned by spencetek and has no dns entry since 2023-12-02.Google maps reports spencetek as permantently closed.I think they're done.

author: Muxr
author_rank: Super Contributor
timestamp: February 27, 2024, 01:30:53 pm
content: The website looks to have been archived by the Internet Archive:https://web.archive.org/web/20220416054725/https://www.topward.com/sitemap.htmSo you can hopefully use that to retrieve the info you're looking for.

author: Zenith
author_rank: Frequent Contributor
timestamp: February 27, 2024, 03:17:08 pm
content: Thanks.It has operations manuals, but not as far as I can tell, service information. Topward were never great at releasing service manuals.I bought a Topward scope many years back and the service manual was available for a small extra cost, so I bought it. It was just as well I did. A few months back I had to fix an updated version of the scope and that was why I was looking for their website. I couldn't find the service manual I wanted. The one I had wasn't an exact match but was better than nothing.I suppose I should scan my manual and upload it to the usual sites, to make up for the manuals I've downloaded.
Keysight 16861A LA: is acquisition memory in motherboard DIMMs? - Page 1
Forum section: electronics / testgear

author: testerIsTesting
author_rank: Newbie
timestamp: November 14, 2023, 04:47:46 pm
content: Hi! It seems the acquisition memory of the logic analyzer in our lab has died: the acquired data is basically garbage and the self-test fails the "Acquisition Memory Cell Test" (all other tests run fine and pass).Can this be solved by replacing the DDR DIMMs on the LA motherboard? Or is the "acquisition memory" located in a different chip? Is it replaceable at all, or is the logic analyzer dead?Thanks in advance for any help!

author: alm
author_rank: Super Contributor
timestamp: November 14, 2023, 06:13:22 pm
content: I'm not familiar with this series of logic analyzers, but the acquisition memory will be separate from the memory of the embedded PC. Likely close to the FPGAs responsible for acquisition. In the 16700 series memory would be soldered to the acquisition board, and my guess is that it's still the same in the 16800 series.It wouldn't surprise me if your unit is basically a PC with embedded 16750 logic analyzer blade.You might find some helpful information when searching for 1675x repair threads on this forum. Though your unit won't suffer from the corrosion that plagued the 16750 series.

author: DaJMasta
author_rank: Super Contributor
timestamp: November 14, 2023, 06:27:15 pm
content: Acquisition memory is an array of individual chips on the acquisition board - usually a pretty obvious layout feature on the board, and they are soldered in place. These are not the DIMMs for the PC portion.Replaceable at all, sure, but not without soldering. They are likely something like TSOP II packages.

author: testerIsTesting
author_rank: Newbie
timestamp: February 26, 2024, 04:16:46 pm
content: The LA finally came back from calibration/repair: indeed the broken memory resided in an special data acquisition board that had to be replaced.Thanks everyone for your replies!
Aeroflex 2975 Communications Service Monitor - Page 1
Forum section: electronics / testgear

author: RF-Engineer
author_rank: Contributor
timestamp: February 26, 2024, 02:29:39 pm
content: I would like to add an Aeroflex 2975 to the service bench but Aeroflex's service policy and repair pricing scares the Hell out of me. Anecdotally, it seems they develop more issues than say an HP 8920A. Many issues appear to be HDD related. Feedback from experienced 2975 users is most welcome.Paul

author: kc7gr-15
author_rank: Contributor
timestamp: February 26, 2024, 03:19:27 pm
content: There's a user group dedicated to IFR/Aeroflex/Viavi/Whatever-It-Is-This-Week on groups.io. Plenty of 2975-savvy people.https://groups.io/g/IFR-Monitors/topicsOne resource among (hopefully) many.
My Riden 6006 USB communication device does not show the direct current value on - Page 1
Forum section: electronics / testgear

author: -ANP-
author_rank: Newbie
timestamp: February 25, 2024, 04:10:06 pm
content: Hello, I am a user of Riden 6006. I powered the device with a 48V 7.3A power supply right out of the box. Despite the correct connections, it does not provide any output, and the screen shows a value of 2 amps without changing when the output is turned on. When I measured with a multimeter at the output, the current and voltage values ​​were correct, but the current value displayed on the screen is incorrect. I calibrated it from the interface program, but my problem was not solved. Can you help me?
Hantek 6022BE Maximum voltage in 1x and 10x mode - Page 1
Forum section: electronics / testgear

author: kavehm
author_rank: Contributor
timestamp: February 26, 2024, 01:30:20 am
content: What is the maximum voltage for 1x and 10x mode?35V voltage is written next to the BNC connector. Is this maximum voltage for 10x mode?

author: Aldo22
author_rank: Super Contributor
timestamp: February 26, 2024, 09:02:16 am
content: You can find information here:https://www.eevblog.com/forum/testgear/hantek-6022be-20mhz-usb-dso/1100/Be careful!

author: horo
author_rank: Regular Contributor
timestamp: February 26, 2024, 10:53:17 am
content: Aldo22,thank you for the link to my older post, so I don't have to repeat myselfMaybe Dave's video is also interestingMartin

author: kavehm
author_rank: Contributor
timestamp: February 26, 2024, 11:45:08 am
content: Quote from: Aldo22 on February 26, 2024, 09:02:16 amAs I understand, in 1x mode, the safe voltage is 5 volts and it can be used up to 35 volts. And in 10x mode, the safe voltage is 35 volts, which can be measured up to 350 volts. Have I understood correctly?

author: horo
author_rank: Regular Contributor
timestamp: February 26, 2024, 01:55:13 pm
content: Quote from: kavehm on February 26, 2024, 11:45:08 amThe usable input voltage range is -5V ... 5V. Voltages below -5V are limited to -5V and voltages above 5V are limited to 5V, so it makes no sense of applying higher voltages, this is just a safety margin.Voltages outside the safe range of +-35V (can) destroy your device.With a 1:10 probe the limits are 10 fold, i.e. measure between -50V..+50V, the safe range istheoretically-350V..350V. However, I would suggest keeping the limit of +-50V as values outside this range will not give useful results. Also check the safe operating voltage of the probes. Please be very careful with high voltages.You can check the principle schematics of the oscilloscope in the user manual on page 20:https://github.com/OpenHantek/OpenHantek6022/raw/main/docs/OpenHantek6022_User_Manual.pdf
Meter out of range - Page 1
Forum section: electronics / testgear

author: spacebiscuit
author_rank: Newbie
timestamp: February 25, 2024, 01:14:09 pm
content: Sorry if this is a bit of a newbie dumb question, but I have the following multi-meter - only about 1 month oldJust recently I noticed that the display is showing fluctuating result on the dc voltage settings, however it always reset to 0 when I touch the red and black probes which I understand is desireaable. however when I try to measure for example a 1.5v Aa battery the screen display 1 - as if out of range. I've tried the other ranges and get the same. The diode/continuity mode seems to work ok.Any ideas - I tried the battery in another meter and seems ok.

author: Fungus
author_rank: Super Contributor
timestamp: February 25, 2024, 02:14:35 pm
content: Quote from: spacebiscuit on February 25, 2024, 01:14:09 pmIf you've tried all the ranges then it sounds broken to me.The difference between cheap and expensive meters is how well they survive "events". Did anything bad happen to it?

author: radiolistener
author_rank: Super Contributor
timestamp: February 25, 2024, 02:20:27 pm
content: Looks like bad contact on mode switch. Most of all it works in 200 mV mode instead of 2 V due to bad contact.Try to disassemble it and clean contacts with rubber and alcohol.

author: tunk
author_rank: Super Contributor
timestamp: February 25, 2024, 02:37:56 pm
content: Does the AA cell read correctly in the 20V range?

author: spacebiscuit
author_rank: Newbie
timestamp: February 26, 2024, 09:58:31 am
content: I'm getting out of range on 20v range too.

author: Gyro
author_rank: Super Contributor
timestamp: February 26, 2024, 10:18:00 am
content: It's definitely faulty then. If it's only 1 month old then it's returns time.

author: spacebiscuit
author_rank: Newbie
timestamp: February 26, 2024, 10:58:01 am
content: I opened it up and cleaned the board, but to be honest it is still pristine inside, made no difference.I've received a credit on the refund - time to find another - thanks!
Manual / Datasheet for "vintage" Escort EUC-2200 anywhere? - Page 1
Forum section: electronics / testgear

author: Noy
author_rank: Frequent Contributor
timestamp: November 26, 2020, 08:50:37 am
content: Hi, i have an older Escort EUC-2200 (Universal Counter 5Hz-175MHz) sitting around here. Unfortunally i don't have a datasheet or a manual.Does somebody know anything about this device?

author: LR
author_rank: Newbie
timestamp: February 25, 2024, 03:17:26 pm
content: Hello I also have this counter and am looking for the documentation. Do you now have this documentation in your possession and can I get a copy?Thank you in advance, kind regards, L.R.
Rigol DHO814 Horizontal Line Trace Not Visible (Bug) Issue - Page 1
Forum section: electronics / testgear

author: efix
author_rank: Newbie
timestamp: February 23, 2024, 03:32:38 pm
content: As mentioned in the subject, the horizontal line trace is not visibleonce I restart it automatically Fixes itselfKindly Help if anyone is facing the same issue, or if anyone knows how to fix itRigol DHO814

author: beatman
author_rank: Regular Contributor
timestamp: February 24, 2024, 02:09:57 pm
content: This happens sometimes on my MSO5000 when power on and activate ch1 there is no trace.I just activate the ch2 and the ch1 trace is back then deactivate the ch2 and i use the scope.
Adding GPIB to HP859XE Spectrum Analyzer - Page 1
Forum section: electronics / testgear

author: Michael-VK2BEA
author_rank: Regular Contributor
timestamp: February 24, 2024, 04:23:54 am
content: I have an HP 8590E series analyzer that has only the parallel interface.Does any one know if I replace this with the GPIB board (opt 21) (08590-60108) whether the firmware will recognize the board and enable the menu options?I know some options are enabled by a series of soft menu keys but I've not seen any reference to the GPIB option.Michael

author: nfmax
author_rank: Super Contributor
timestamp: February 24, 2024, 07:21:25 am
content: A long time ago, I upgraded my 8591E with a GPIB interface. I don't recall having to change anything in the 'secret' settings, the GPIB just appeared in the menus. Mine didn't have the parallel interface fitted though.
Fluke 87 First generation, front cover - Page 1
Forum section: electronics / testgear

author: rauldm
author_rank: Regular Contributor
timestamp: February 10, 2024, 02:48:18 am
content: Hi, I bought an used Fluke 87 in very good shape, even still it has the display sticker. I tested the meter and works fine, the calibration is keep yet, but the screw post is broken, someone in this forum has a front cover in very good shape?Regards

author: MegaVolt
author_rank: Frequent Contributor
timestamp: February 22, 2024, 12:52:58 pm
content: https://aliexpress.com/item/1005004962663967.html
Instec GPP-2323 recorder feature isn't working ?! - Page 1
Forum section: electronics / testgear

author: paul.zimmer
author_rank: Newbie
timestamp: February 22, 2024, 02:52:33 pm
content: I have been happily using my GPP-2323 for the past few months, but when I wanted to record my output to my USB stick, it would not save any data. The manual gives fairly intuitive instructions on how to do this, but as I have tried every setting for file type and location. I am still unable to find any saved data in the specified location. Has anyone else experienced this? Or knows that I am doing something wrong? In my understanding the data should automatically be safed in the specified location after the recording stopped...
Marconi 2382/2383 without 2380 display - Page 1
Forum section: electronics / testgear

author: khach
author_rank: Contributor
timestamp: February 22, 2024, 12:49:48 pm
content: I recently managed to find the Marconi 2382 Rf module without 2380 display unit. I want to try use 2382 without display unit with software display retrofit on PC.Data transfer link from 2382 to display by fast SPI-like interface is well described in service manual. But control interface is UART current loop with 9600 bod is described only like hardware realization. I cannot find any info about software protocol. From firmware reverse I see many two character command like GPIB command of 2380 unit. But any description of this command like embedded help or any other info.Сan anyone with working set of 2380-2382 try to obtain log of interlink unit communication with some description like init, span, zero span etc?
HP 35665A printscreen  - Page 1
Forum section: electronics / testgear

author: ciasteczkowypotwor
author_rank: Contributor
timestamp: March 02, 2015, 04:30:42 pm
content: Hello,I need help.My HP 35665 PLOT menu / PRIN can save a screenshot of a floppy disk. Saves it to a file without expands. How to open this file?Or how to perform a screenshot to a file on a floppy disk.

author: Guni
author_rank: Regular Contributor
timestamp: March 02, 2015, 10:07:05 pm
content: http://www.trs-rentelco.com/Specs-Manuals/AT_35665A_Manual.pdfCheck chapter 11-9 (Recallnig a trace)

author: miguelvp
author_rank: Super Contributor
timestamp: March 03, 2015, 06:11:55 am
content: I use to know people at trs-rentelo in Grapevine TX, They even play me singing karaoke at their work place, but this was 8 years ago

author: ciasteczkowypotwor
author_rank: Contributor
timestamp: March 03, 2015, 05:06:31 pm
content: I know how to save to a floppy disk, but how to open the file on PC?

author: Lukas
author_rank: Frequent Contributor
timestamp: March 03, 2015, 06:19:13 pm
content: Quote from: ciasteczkowypotwor on March 03, 2015, 05:06:31 pmWould be nice if you uploaded the file, so we can take a look at it.

author: miguelvp
author_rank: Super Contributor
timestamp: March 03, 2015, 06:28:45 pm
content: If your computer doesn't have a floppy drive, I guess you can always get a usb external floppy disc drive for under $25.

author: ciasteczkowypotwor
author_rank: Contributor
timestamp: March 03, 2015, 07:37:07 pm
content: It worked.It is a program that emulates HP plotter.http://www.ke5fx.com/gpib/7470.htm

author: Barbot
author_rank: Newbie
timestamp: February 22, 2024, 02:09:56 am
content: How did you make it work? I tried using the Keysight GPIB to USB adapter without any success with the 7470 emulator. I think I need a NI instrument GPIB to USB which I dont have at the moment.Thanks

author: KE5FX
author_rank: Super Contributor
timestamp: February 22, 2024, 02:28:39 am
content: How'd it fail? There are a few different things that can go wrong, some of which are fixable and some of which aren't.
VTVM test leads - Page 1
Forum section: electronics / testgear

author: bzadel
author_rank: Newbie
timestamp: February 21, 2024, 03:09:09 am
content: Hello,Would anyone know of a compatible substitute test lead for the PACO V-70 VTVM? It's pretty much like most of them with an AC/Ohms, DC side swith with a 1 meg resistor. An original would be nice but I don't hold out any hopes of finding one. Any suggestions would be appreciated.Thank you,Bill

author: Oilngas
author_rank: Contributor
timestamp: February 22, 2024, 03:29:03 am
content: There's this...https://www.ebay.com/itm/232269025972?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=su5OMBkDT9W&sssrc=2047675&ssuid=aWBl_P2fQuK&widget_ver=artemis&media=COPY

author: Oilngas
author_rank: Contributor
timestamp: February 22, 2024, 03:43:04 am
content: Just noticed on eBay there's a PACO V-70 for sale, which appears to include the probes, for less money than the above link.https://www.ebay.com/itm/335208757286?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=GbkBISdLQAK&sssrc=2047675&ssuid=aWBl_P2fQuK&widget_ver=artemis&media=COPY
Cheap Chinese LMX2594 based 15GHz sweep generator.  - Page 1
Forum section: electronics / testgear

author: Fflint
author_rank: Frequent Contributor
timestamp: February 20, 2024, 06:43:32 pm
content: Does anyone have the pictured sweep generator? I'm looking for more information about if there is a better firmware for it etc.Sadly I have a problem with the main sweep function. One would expect the setting to either set how long it stays on each step or how long the whole sweep takes, but no. It is sort of random and varies depending on what the frequency step is set to. Also it seems to overflow every 255ms (if it is set to 255ms it is fairly slow, then on 256ms it is very fast) and max value is 9999msI have a pretty old HP spectrum analyzer so I'd like to set the sweep to fairly slow (100ms on every step for example or 30s the entire sweep). Instead I get semi random delays in the range between 10ms up to maybe 100ms.If anyone has any ideas, perhaps a schematic (if I had one I could consider writing my own firmware) I'd love to find out. I know it is based on lmx2594, but that's it.
Agilent DSO3000 Power Supply - Page 1
Forum section: electronics / testgear

author: franksretrolab
author_rank: Contributor
timestamp: February 22, 2024, 07:33:26 pm
content: Hello Everyone,I know this is a long shot, but figured I would give it a try.I have an Agilent DSO3102A that does not boot.Buttons light up, fan spins up, and the back light for the screen turns on.....but that's it.I wanted to verify the voltages coming out of the power supply, but am not sure what the proper values would be.I did see some values that seemed odd, but don't have much experience with these.These are the voltages I saw when I probed the pins (order is from front of scope to back of scope).Pin 1: +5vPin 2: +5vPin 3: GNDPin 4: +17.69vPin 5: GNDPin 6: +7.95vPin 7: -7.97vPin 8: GNDPin 9: -16.85vPin 10: GNDPin 11: +30.78vPin 12: +155mvI could be wrong, but some of the voltages don't seem right.This was tested under load with the main board connected.If you have any thoughts or suggestions, or better yet if you have one that you know what the voltages should be, I would greatly appreciate it!Thank you in advance!!
Rigol ds1054z  /  dho914 - Page 1
Forum section: electronics / testgear

author: MatVer
author_rank: Newbie
timestamp: February 18, 2024, 11:01:12 pm
content: Hello, my name is Mathis Verschueren and I am planning to buy an oscilloscope for high school and later college, Which scope is the best, the dho914 or the ds1054z. Which one would you choose? Because the form factor and 12 bit and 50mpts are nice things to have. But is the dho914 ready to take measurements And there are not too many bugs, the logic analyzer will not be used for me, the 200 microvolt per division would be very useful for me, but if it has too many bugs I will buy the other one What would you do in my situation?Mathis Verschueren Belgium

author: Martin72
author_rank: Super Contributor
timestamp: February 18, 2024, 11:18:46 pm
content: Hi,Between the two clearly the DHO.If you can wait 2 weeks there would be further alternatives avaible.

author: MatVer
author_rank: Newbie
timestamp: February 18, 2024, 11:23:39 pm
content: Will there be more in the dho series or updates or better ones

author: Fungus
author_rank: Super Contributor
timestamp: February 19, 2024, 12:59:46 am
content: Definitelynotthe DS1054Z, it's an antique now.If you don't want the logic analyzer then you could get a DHO804. They're much cheaper and it's very easy to convert to a DHO924.(just change one file on the 'scope and that's it, it's a DHO924 but no logic connector on the front)There's a few bugs but nothing that stops you from working and certainly nothing that would make you buy a DS1054Z instead.

author: MatVer
author_rank: Newbie
timestamp: February 19, 2024, 06:48:50 am
content: Is the signal generator worth adding or is the signal generator a toy that cannot be used?

author: Fungus
author_rank: Super Contributor
timestamp: February 19, 2024, 02:23:09 pm
content: Quote from: MatVer on February 19, 2024, 06:48:50 amThat depends on whatyouneed from a signal generator.Edit: The DHO914S (the cheapest model with SG) nearly 400 Euros more than a DHO804.You can buy a good signal generator for that much money, you'd need areallygood reason to want it built-in...

author: Aldo22
author_rank: Super Contributor
timestamp: February 19, 2024, 02:37:53 pm
content: Quote from: MatVer on February 19, 2024, 06:48:50 amSince the AWG costs extra, I think you get more from a separate one.A 2-channel FY6900 doesn't cost more than the extra charge and is superior in every respect afaics.Just my 2¢, I have neither the Rigol nor the FY6900.
Wanted someone to hack SSA3015X Plus - Page 1
Forum section: electronics / testgear

author: Crambone
author_rank: Frequent Contributor
timestamp: February 20, 2024, 12:59:17 am
content: I have a SSA3015X Plus and I’m as good with computers as much as I am at Brain Surgery at that say a it all. I am looking for someone that can do the hack for me and will gladly pay for your time. Please reach out to me at kb2lmn@gmail.comI’m located in United States (New Jersey)
Keysight bundle - missing licenses ?  DSOXT3APPBNDL - Page 1
Forum section: electronics / testgear

author: EE-digger
author_rank: Frequent Contributor
timestamp: February 20, 2024, 05:16:34 am
content: Can anyone with the DSOXT3APPBNDL tell me if it includes the following licenses? Data sheets across several years say it should but my scope does not.USB-PDUSB low speed signal qualityUSB full speed signal qualityI'm wondering if these just did not make it in time to be installed with the bundle (2016 scope).

author: TheSteve
author_rank: Unknown
timestamp: February 20, 2024, 05:49:07 am
content: I believe this was discussed previously. Additional features have been added to the license bundle over time.

author: LaurentR
author_rank: Frequent Contributor
timestamp: February 20, 2024, 07:53:17 am
content: They are in that bundle. I assume upgrading your firmware should do the trick.What isn't in that bundle is USB LS/FS decode, which is only available in the newer bundle (D3000BDLB)..

author: 2N3055
author_rank: Super Contributor
timestamp: February 20, 2024, 01:59:42 pm
content: Quote from: LaurentR on February 20, 2024, 07:53:17 amLike Steve said, this was discussed several times at length.Short version?Full bundle meansone time activationofallthe optionsat the time you BOUGHT a bundle.It works by scope enabling licenses individually for all options available at that time.As Keysight with years created new options, on your old scope they are not activated. They didn't exist at the time.So with new FW, you will see new options as available, but those new ones will be unlicensed.And as your bundle was one time activation, you cannot enable them afterwards with it.You have to buy them.How do I know? I asked Keysight Tech support about it.Best,

author: EE-digger
author_rank: Frequent Contributor
timestamp: February 20, 2024, 03:18:08 pm
content: Knowing it's been flogged in the pastI did a careful study before posting and know that once you buy it, that's all you get.On all paper and according to LaurentR, it seems that the USB-PD should be present. Firmware is up to date. This one fell through the cracks, probably because of the 2016 build date. The "about" screen shows the enumerated options and each has a license file present on the scope.Daniel worked on this topic back when the topic was previously discussed. The only change was the creation of the new "application specific" bundles. These, like AERO, AUTO, etc. do need the latest firmware as that firmware will support new options added to the bundle.Thanks for the replies. I wanted to hear it from the horse's mouth. As before, it's still too bad you can't update the options at low cost but low cost isn't on Keysight's marketing lips anymore.
ESR meter - Page 1
Forum section: electronics / testgear

author: janengelbrecht
author_rank: Regular Contributor
timestamp: February 19, 2024, 07:23:15 pm
content: I have built an incircuit ESR meter based on arduino.My only problem is calibrating it.I only have the AVR component tester from ebay TC-7. And we all know it isnt really that good.Is there some industry standard methods to measure ESR with an oscilloscope, tonegenerator and perhaps a few components ?

author: xtech
author_rank: Regular Contributor
timestamp: February 19, 2024, 07:52:45 pm
content: Use resistor, then measure unknown capacitor and check if adding same resistor in series with capacitor changes reading by proper value.

author: pqass
author_rank: Super Contributor
timestamp: February 19, 2024, 08:34:25 pm
content: Quote from: janengelbrecht on February 19, 2024, 07:23:15 pmNot industry standard but useful still... calculations shown at 11:53.

author: kripton2035
author_rank: Super Contributor
timestamp: February 19, 2024, 09:23:02 pm
content: I would use a simple small value like 1Ω resistor, it would be more than close to the real result, and enough to test if a capacitor is good or not.I also have resistors to 50mΩ to check my esr meters ...
Brüel & Kjær 1024 Sine Random Generator arc over repair - Page 1
Forum section: electronics / testgear

author: oz2cpu
author_rank: Frequent Contributor
timestamp: July 06, 2023, 01:11:37 pm
content: this Brüel & Kjær 1024 Sine Random Generatorhas been driving me nuts for a few days,arc over near output amplifier and attenuator switchesI made a little video to entertain you with all my findingshttps://youtu.be/cuddRclKtCY

author: as-audio
author_rank: Newbie
timestamp: February 19, 2024, 05:47:10 pm
content: Do you own a schematic ?

author: oz2cpu
author_rank: Frequent Contributor
timestamp: February 19, 2024, 06:40:21 pm
content: sure, as-audiojust look here :https://peel.dk/Bruel&Kjaer/and yes i solved it.

author: as-audio
author_rank: Newbie
timestamp: February 19, 2024, 07:52:11 pm
content: It would be interesting to know what happened. I was not able to listen to the video.This is one of the most useful Brüel & Kjaer instruments.
8482A vs N8482A - Page 1
Forum section: electronics / testgear

author: metebalci
author_rank: Frequent Contributor
timestamp: February 18, 2024, 04:26:01 pm
content: Is there a difference between these two other than the bandwidth (4.2 vs. 6 GHz) and the EEPROM in N8482A ?

author: R-1125F
author_rank: Regular Contributor
timestamp: February 18, 2024, 09:08:01 pm
content: The N8482A stores the cal factors in EEPROM so that they do not need to be loaded manually. The 8482 does not. The N8482A is compatible with the E4418B.

author: metebalci
author_rank: Frequent Contributor
timestamp: February 19, 2024, 07:31:15 am
content: So other than the ease of use regarding the cal factors, no performance or other difference within the same type of use (certainly not more than 4 GHz and most probably up to 2GHz) and with E4418B ?

author: R-1125F
author_rank: Regular Contributor
timestamp: February 19, 2024, 12:43:08 pm
content: The dynamic range is different. It is a little better for the N8482A. The N8482A dynamic range is -35 dBm to +20 dBm and the 8482A is -30 dBm to +20 dBm.
Symmetricom XLi : Oscillator Configuration - Page 1
Forum section: electronics / testgear

author: comsec22
author_rank: Contributor
timestamp: May 26, 2023, 12:23:43 pm
content: How to upgrade the internal reference oscillator, beside to add a better OCXO (or a rubidium) instead of the standard TCVCXO ?According to the manual it's a matter ofhardware configuration, but how to switch from one to another ?Unless to use J3 as external reference..Thank You

author: testpoint1
author_rank: Frequent Contributor
timestamp: February 19, 2024, 12:51:27 am
content: Quote from: comsec22 on May 26, 2023, 12:23:43 pmfor the hardware, it is easy to change one, but, no command can modify it.
Comparing modified BG7TBL (Galileo) to Trimble (GPS) GPSDO with HP 53310A MDA - Page 1
Forum section: electronics / testgear

author: kj7e
author_rank: Frequent Contributor
timestamp: February 10, 2024, 01:22:33 am
content: Its been a while since I pulled out the HP 53310A MDA so gave it some love the other day. For the fun of it, I connected my modified BG7TBL GPSDO (u-blox NEO-M8T and Oscilloquartz 8663 OCXO) on the Galileo constellation to the reference input, and my second ZYT Trimble based GPSDO on the GPS constellation to the A input. This was to compare the overall frequency deviation between the two units on separate systems. Also to confirm my BG7TBL unit did not experience the documented low freq offset.Happy to say, after a few hours of averaging the samples, no offset can be found.Click to expandLink to my modified BG7TBL;https://www.eevblog.com/forum/testgear/bg7tbl-gpsdo-master-reference/msg2493726/?topicseen#msg2493726BG7TBL Freq offset info;https://blog.febo.com/?p=636

author: kj7e
author_rank: Frequent Contributor
timestamp: February 10, 2024, 01:32:32 pm
content: Video Demo of the 53310A comparing the two GPSDO's including a short time laps accumulating samples.

author: kj7e
author_rank: Frequent Contributor
timestamp: February 19, 2024, 12:29:43 pm
content: Another comparison a week later...Click to expand
Rigol Part Numbers - Page 1
Forum section: electronics / testgear

author: boful
author_rank: Contributor
timestamp: February 12, 2024, 02:08:23 pm
content: Please, Brain Fog Here On this question.Have looked in this Forum, Rigol descriptions, Google searches etc.Some of Rigol Equipment Has -AMZ2 included. Can not find what his indicates.Examples, Rigol DS1054Z-AMZ2, Rigol DSA815-TG-AMZ2 vs Rigol DS1054Z, Rigol DSA815-TGThe test equipment can be listed for sale etc, with and without the -AMZ2 descripition. Price and specs seem the same.Thanks for any response.

author: xrunner
author_rank: Super Contributor
timestamp: February 12, 2024, 05:05:10 pm
content: Hmmm. Well I found this out - if you search for Rigol DS1054Z-AMZ2 on Amazon it shows up just like that -Rigol DS1054Z-AMZ2 | 50 MHz Digital Oscilloscope with 4 Channels Plus 12 Mpts Memory, 1 GS/s Sampling RateI found out that AMZ2 is this -Leverage Shares 2x Amazon ETP Securities A (AMZ2)https://www.investing.com/etfs/amz2-historical-dataSo all I can say about it at this point is that it's interesting.

author: alm
author_rank: Super Contributor
timestamp: February 13, 2024, 11:02:42 am
content: It might just be a different part number and distribution channel so when asking for a price match, other sellers can say "That is a different model, we don't have to match that". Or the other way around so they can tell Amazon that Amazon has the lowest price without imposing restrictions on other sellers. I know it's common for consumer appliances like TVs to get unique part numbers for big retailers so they don't have to price match.

author: boful
author_rank: Contributor
timestamp: February 18, 2024, 06:48:31 pm
content: Yep..That could be it .. Can find nothing that shows any difference with equipment that have the AMZ2 part numberthanks
rohde&schwarz FSH spectrum analyser pin code - Page 1
Forum section: electronics / testgear

author: Jelbert
author_rank: Contributor
timestamp: February 16, 2024, 01:08:56 am
content: Hi,I might be able to get my hands on a FSH18 spectrum analyser. However I now read on R&S website about a Master PIN code. Before I go and invest in a device I can not test in advance. Is there a way to circumvent this PIN once I have the device?

author: drhex
author_rank: Regular Contributor
timestamp: February 18, 2024, 11:23:41 am
content: Original master code is on the calibration certificate. If the PIN has been set and you don't get that along with the device only R&S can reset it. Ask the seller if he can switch on and operate the device, if that works no PIN is set and you will be fine.
Extech 410 multimeter auto-off question - Page 1
Forum section: electronics / testgear

author: jimdeane
author_rank: Regular Contributor
timestamp: July 21, 2017, 09:19:01 pm
content: I bought an Extech 410 multimeter for my physics lab -- intended to be the "nicer" meter I use for demos and other measurements.Right now I'm monitoring a supply voltage, and the damned thing auto-offs itself every 10 minutes. Can't press a button to turn it back on, or even jiggle the handle. You have to go all the way back to "off" and then back to your reading position.I read the manual and emailed them, it's just "the way it is".Anyone know of a way to either stop the auto-off, temporarily stop it, or make it so i can hit a button or use a magnet and a reed switch to reset/keep it on?

author: StevokeanoPleaseApprove
author_rank: Newbie
timestamp: February 17, 2024, 06:03:15 pm
content: Ever find a work around?

author: mwb1100
author_rank: Frequent Contributor
timestamp: February 18, 2024, 10:41:47 am
content: Most meters that support disabling auto power off do so by holding down one of the buttons suchas select/func or hold while turning the meter on. I doubt that will work for the EX410 since the manual doesn't mention it, but it's easy enough to try.Your alternative to is to get a meter that supports disabling APO. One cheap option is the Aneng 8001 which runs for less than $20 on Aliexpress. Or maybe something like this cheapie:https://www.amazon.com/gp/product/B09M8641Y7($10 on Amazon at the moment) which allows APO to be disabled.
Hantek DPO8000 scope series - Page 1
Forum section: electronics / testgear

author: twwwt
author_rank: Newbie
timestamp: February 18, 2024, 08:20:33 am
content: Hello,has anyone seen one ofHantek's DPO8000 scope seriesalready? Wondering what you think about it and how it compares to others with similar technical capabilities (bandwidth up to 1GHz, 8GSa/s, 600,000 wfms/s, ...).Seems Hantek has a tendency to market product details far before the point in time when they actually become available - saw this similarly for their bench multimeters.
Hantek TO 1252D problem with "system info" - Page 1
Forum section: electronics / testgear

author: andefim
author_rank: Newbie
timestamp: February 22, 2024, 05:19:03 am
content: I purchased a new Hantek TO1252D oscilloscope. When I turned it on for the first time, it didn’t turn on from the batteries, so I put it on charge for an hour. Then I turned it on from the network, when I pulled out the cable it turned off again. I checked the batteries inside, they showed 2.65V and could not charge. I replaced the batteries and everything worked, but in the “system info” information about the model, serial number and version of the safety control panel was lost. Before this it was there since I checked the model number. I tried to flash the version from the office. website, only the firmware version was reduced, the information did not appear. The device is new, I just had time to calibrate the probe. Please help, I think it can be solved with firmware.
How to safely use a logic analyzer ?  - Page 1
Forum section: electronics / testgear

author: electronic_guy
author_rank: Regular Contributor
timestamp: February 17, 2024, 10:16:08 am
content: Hi,I’m new to logic analyzers. I have an Agilent 1683AD. I need to know how to use it safely without damaging the equipment. Can you guys point me out how not to destroy it and what are the good practices to use it effectively ?Any beginner tutorials you have or you have found would be certainly helpful for me to get started.Thanks in advance.

author: tggzzz
author_rank: Super Contributor
timestamp: February 17, 2024, 10:28:05 am
content: Quote from: electronic_guy on February 17, 2024, 10:16:08 amTreat it as anunisolated"USB oscilloscope" that doesn't record analogue waveforms but does record digital signals.Don't exceed the input voltages specified in the manual. They will be much more restricted than an oscilloscope's input.Do connect all the common "0V" wires to the same point; that is unlikely to be difficult, but I have come across equipment with TTL signals running between -16V and -11V!As with oscilloscopes, only attach the 0V to points on the circuit that can be connected to protective mains earth.Consider using a scope to verify that the points that you intend to use for connections actually are "safe" before connecting the LA.As for a tutorial, RTFM is always a good start

author: rcjoy
author_rank: Regular Contributor
timestamp: February 17, 2024, 10:37:58 am
content: Always have the logic analyzer to be the first on and the last off.That is, when turning on, turn on the logic analyzer first , then turn on the device under test.When turning off, turn off the device under test first, then turn off the logic analyzer.

author: alm
author_rank: Super Contributor
timestamp: February 17, 2024, 04:04:23 pm
content: It is an instrument with the ground of all channels connected to earth (assuming it's connected to a socket with earth), just like a scope. In general this is less of a problem than for scopes, because you are not likely to use a logic analyzer for power supplies or anything like that. But on occasion you need to pay attention to where ground is. Otherwise, as tggzzz says pay attention to the voltage limits, although I believe the limit of the pods isn't that low (40 Vpeak?). I haven't had problems in the systems I worked on where the 5V/3.3V logic was usually well separated from any higher voltages, but that obviously doesn't apply to every system.
Hantek DSO5000P series accuracy question  - Page 1
Forum section: electronics / testgear

author: kavehm
author_rank: Contributor
timestamp: February 18, 2024, 01:26:24 pm
content: I need to buy an oscilloscope. Not for professional work. But I need the accuracy of measurement about mV. I saw the videos of Hantec 2000 series models on YouTube. They did not measure accurately at all. They cannot measure below 150 millivolts and they are not accurate in measuring below one volt.I would be grateful to those who have experience working with the hantek dso5000p series to guide me. In the description of these series, the measurement accuracy is two millivolts. Is it actually able to measure in this amount? And is it effective in measuring frequencies in millivolts? I was going to buy Rigol ds1102z-e series. But Hantec do5000p series is cheaper and more compatible with my budget.I will be thankful if guiding me.

author: Aldo22
author_rank: Super Contributor
timestamp: February 18, 2024, 02:02:22 pm
content: Quote from: kavehm on February 18, 2024, 01:26:24 pmThat's not true.What exactly do you want to measure? DC, 1kHz, 100MHz?It's an oscilloscope, not a multimeter, but imo it measures correctly even in lower volt ranges.Example: This is 2.5mVPP square@1kHz on a DSO2C10

author: DavidAlfa
author_rank: Super Contributor
timestamp: February 18, 2024, 02:15:41 pm
content: Most digital scope won't perform good enough for 1mv accuracy, the noise gets pretty high at lower V/Div.Try the newer 12-bitd Rigol DHO800, has much better resolution though a bit buggy. Still much better than Hantek.Have a look at youtube!

author: kavehm
author_rank: Contributor
timestamp: February 18, 2024, 02:35:42 pm
content: Quote from: Aldo22 on February 18, 2024, 02:02:22 pmThanks for answer.That's why I posted here that in the videos I saw, I was unable to measure frequencies with peak to peak below one volt and I wanted to know about other people's experiences. I need an oscilloscope in the working range of kHz up to 5 MHz. According to the picture you sent, there is no problem in measuring peak-to-peak values ​​below one volt with Hantec oscilloscopes, and it answers my work needs.

author: Aldo22
author_rank: Super Contributor
timestamp: February 18, 2024, 03:30:36 pm
content: Quote from: kavehm on February 18, 2024, 02:35:42 pmThat should be possible.Don't expect miracles, this is one of the cheapest, if not THE cheapest bench oscilloscope available.If you need more precision, it will cost significantly more.Attached 20mVPP sine @5MHz (whereby my external signal generator is also not beyond reproach.)
Protek / Unisoft / Seintek C3100 programmable universal counter - Page 1
Forum section: electronics / testgear

author: sabia
author_rank: Contributor
timestamp: January 13, 2016, 10:06:18 pm
content: I'm considering buying a counter that can measure both absolute frequency, frequency difference and time interval. I need at least 1ppm accuracy and plan to use a fancy universal counter with a 10 MHz GPSDO as an external reference to achieve the accuracy without having to spend lots of money on periodic calibration and an OCXO upgrade.I have looked at Agilent 53131A and have a 5335A in the lab currently, but it has developed a fault. And I want to upgrade to something that offers RS-232 or USB connectivity and statistics, and so I have looked at some second hand Protek / Unisoft / Seintek C3100 programmable universal counters.Trouble is, I'm having difficulties assessing if they are any good, and if it's possible to get the software for these. As far as I can tell from the manual.pdf]http://electronicsandbooks.com/eab1/manual/Hardware/P/Protek%20www.protektest.com/C3100%20User%20Manual%20c20041206%20.pdfthe software used to come on a floppy disk! Old school stuff! O0I would love to hear from you EEV bloggers out there if you have any experience with this counter, and alternatively for tips on other units I should consider. My budget for the counter is $500.Thanks!

author: TheWaterbug
author_rank: Contributor
timestamp: February 16, 2024, 10:50:31 pm
content: In case anyone tried to click that link, it's malformed because it has [square braces] that corrupt the URL.User manual is at:http://electronicsandbooks.com/edt/manual/Hardware/P/Protek%20www.protektest.com/C3100%20User%20Manual%20c20041206%20%5B35%5D.pdfand programmers reference is at:http://electronicsandbooks.com/edt/manual/Hardware/P/Protek%20www.protektest.com/GPIB%20RS232C%20Programming%20Manual%20c20041231%20%5B20%5D.pdf