hybridfree/eevblog-posts huggingface dataset:
BenchVue and Keysight - Page 1
Forum section: electronics / testgear

author: wrieken
author_rank: Contributor
timestamp: July 10, 2019, 04:18:50 pm
content: A few questions:1. Can the B2962A be used as an SMU like the B2902A?2. Except for the people at Keysight working with me, has anyone else at Keysight actually wrote BenchVue code using the B2962A or B2902A to gather 4-point-probe data? Keysight does state that the B2902A I/V source is the main reason for its existence.The 4-point-probe appears to be discussed in Keysight documentation more as a theoretical rhetorical concept then an actual use of Keysight instruments in the real-world. I base my assumption on the fact that Keysight has never publicly put forth any real-world examples of such usage by Keysight instruments nor in BenchVue coding examples.I would, of course, like to be wrong about that since this is what I am attempting to do.While I do see basic examples that are fine for manufacturing or basic low-level usage of Keysight instruments for corporate engineers in Keysight videos. I have not seen any real-world examples of BenchVue coding or Keysight instrument usage for real advanced laboratory research. Which then begs the questions, does any laboratory in the world even use Keysight equipment? Is this why Keysight has no examples?Thanks,William

author: Keysight DanielBogdanoff
author_rank: Unknown
timestamp: July 11, 2019, 05:50:44 am
content: Hi there,I've passed this thread along to the BenchVue folks, but I'd also recommend giving our technical support center a call if you're concerned about functionality or have any config/operation questions.Regarding the "do people actually use it" question, I've personally seen the data and can vouch that it does get used. A lot.

author: wrieken
author_rank: Contributor
timestamp: July 11, 2019, 10:29:56 am
content: Thank you very much for your reply.I would very much like to see more BenchVue software demos showing:1. I/V, Ohm/T, V/T curves and other measurements for scientific usage.2. Graph making - BenchVue graphs are the worst I have seen in software since the 1970s. Keysight needs to fix this badly.3. Keysight has 3 ~5-minute videos and some of them are not too bad. However mostly there are many "intermediate" steps that are missing in the videos.4. Much better documentation and demo's need to be made, especially since Keysight charges thousands of USD for the software. Even free "Scratch" at MIT is better then BenchVue in this area.5. I have checked, and BenchVue is NOT based upon Scratch, nor do they have a common core.As for my actual request:If you have any ideas for programming BenchVue for I/V, Ohm/T and V/T for cryogenic measurements. Please let me know how to reach you. I have recently ordered the new DAQ, which Keysight is currently loaning, to handle temperature measurements in-line with the B2902A. I do have local support, however, I would like to get additional input for what we are doing.I hope we could chat ...Thanks,William
Lecroy SDA6K/WaveMaster8K help needed... SDA6000A WM8600A - Page 1
Forum section: electronics / testgear

author: darkstar49
author_rank: Frequent Contributor
timestamp: July 10, 2019, 10:58:47 am
content: sorry to bother in this board with such a request, but I know it's typically a lot more visited than the 'repair' one... ;-(although I posted a similar request there...)Got a dead Lecroy SDA6000A here, and need some advice about disassembly !! I've been authorised by the seller to open it, but as return is still an option being discussed, I can't experiment too much, and surely can't afford to damage it while disassembling...I think the handle must be removed first (I have a relatively good h/w knowledge of many Lecroy scopes, but none with a handle, so far...), but I can't find any info on how to get it off...Any info/idea/pointer is welcome !!

author: Mechatrommer
author_rank: Super Contributor
timestamp: July 10, 2019, 11:14:17 am
content: i know what you meant by repair section got lesser hit... but imho its better just to notify members by providing the link to where the replies should be, replies on different threads about the same topic can be a mess... members should reply in the thread below, imho...https://www.eevblog.com/forum/repair/lecroy-sda6kwavemaster8k-information/

author: DaJMasta
author_rank: Super Contributor
timestamp: July 10, 2019, 03:47:27 pm
content: The handle doesn't have to be removed, it's fixed to the top chassis cover. You take the bezel off with the screws on the underside above the input connections (this plastic piece tends to be brittle and thin). This exposes a ring of screws holding down the top chassis metal in the front, then also remove the two upper feet in the rear. If I remember right, the screws on the side only have to be removed if you're removing the lower metal cover.Also worth mentioning that if you're looking for something on the acquisition board, you have to go much farther in, the steps described above will only get you into the main compartment with the computer motherboard.
Hantek DSO5102P Niggle - Page 1
Forum section: electronics / testgear

author: StevenWithAVee
author_rank: Contributor
timestamp: June 20, 2019, 06:04:22 pm
content: Hi,If you look at any waveform on my scope, and remove the probe immediately, the 'scope continues to display the waveform in a kind of 'hold' mode for about half a second. It's really starting to annoy me!Anything I have missed in the menu anywhere that affects this behaviour?Thanks!

author: Microcheap
author_rank: Frequent Contributor
timestamp: June 20, 2019, 10:03:57 pm
content: Hello Steven and welcome to the forum.It sounds like the persistence time is set, check if it is off in the "Display" menu. If it is already off check then if the acquisition mode is not set to average instead of normal. Or simple press the Default Setup button that it will restore the original configuration of the scope.

author: StevenWithAVee
author_rank: Contributor
timestamp: June 21, 2019, 01:18:01 pm
content: Hi and thanks for the welcome.I have tried that -- unfortunately still the same behaviour. Has anyone else got one to confirm if this is just a typical "feature" -- or has mine gone squiffy?Thanks!

author: Microcheap
author_rank: Frequent Contributor
timestamp: June 23, 2019, 02:47:06 am
content: Sorry, I should have checked before answer your question but I finally tested a Hantek DSO4072C that I have access and I think that I understand now what you mean by this "hold feature" and I am afraid to tell you that it is the normal behavior of the scope. Well, at least the DSO4072 also lags a few milliseconds to clean the waveform from the display after I disconnect the probe.To be honest I've never noticed that before and it didn't bothered me, until now that you called my attention to it...

author: tinhead
author_rank: Super Contributor
timestamp: June 23, 2019, 05:21:37 pm
content: try display button(menu) -> page 2/2 -> Refresh Rate and set it to 50 instead of auto (which is default always). That should help.

author: StevenWithAVee
author_rank: Contributor
timestamp: July 01, 2019, 09:31:03 am
content: Thanks, will try when next in the shop

author: StevenWithAVee
author_rank: Contributor
timestamp: July 09, 2019, 07:04:08 pm
content: Looks like that's the one!Thank you, solved[wonders how he can mark thread as resolved...]
Anyone got an RTE1000 at work or home? Or did test one? - Page 1
Forum section: electronics / testgear

author: Craftplorer
author_rank: Contributor
timestamp: July 19, 2019, 07:54:59 pm
content: Hi,im considering the RTE1104 for work. I didn't recieve a quote with all the option yet but base price is the same as RTA4000 and the only downside I see is that mso and arb gen option seem to be incompatible.I would really like to hear if anyone has any experiance with this scope as it seems it is not very popular. At least on the internet for some reason (no reviews/teardowns/forum threads etc...).My other option are currently MDO4000C, Keysight 3000 or 4000 and Tek3 or Tek4. The Tek ones are properly to expensive.The most importend thing for me is digital stuff and to have advanced trigger like sequence(B trigger) stuff.Thats the main reason the RTA4000 is a no go for me. 1GHz Bandwith is a must and USB/Ethernet decoding would be nice to.Oh and SPI decoding should be able to handle >20 MHz SPI.Any thoughts?Here is my shreadsheet I used for comparison. (Feel free to edit)https://docs.google.com/spreadsheets/d/1CKhwyXjgQd-CSqGgXg4kq6S8Z_FSYohccxvptDsTsc8/edit?usp=sharing
Tektronix PS2520G, PS2521G and GW Instek PPT PPS schematics and cal - Page 1
Forum section: electronics / testgear

author: volvo_nut_v70
author_rank: Regular Contributor
timestamp: July 12, 2019, 07:07:30 pm
content: Found while scrounging the net, schematics are for the GW Instek PPS, PPT and Tek 2520G and PS2521G with the last schematic is the unique to the Tek models.The Tek units were rebranded GW Instek units.Hope this is of help........
firmware update for Rohde & Schwarz FSEB 30 - Page 1
Forum section: electronics / testgear

author: analogRF
author_rank: Super Contributor
timestamp: March 18, 2019, 03:56:17 pm
content: Does anybody know if it is still possible to get the latest firmware files (8 or 9 diskettes I think) for R&S FSEB spectrum analyzer and how?Thanks

author: Radiosonde
author_rank: Contributor
timestamp: March 19, 2019, 08:30:43 pm
content: Write an Email to R&S directly, if you ask nicely they may send you the files...would not be the first time they help out hobbyists.But you have to act nicely,politely and showhow much you need it and that you would do ANYTHING for it..Regards

author: Rich@RohdeScopesUSA
author_rank: Frequent Contributor
timestamp: July 07, 2019, 08:47:34 pm
content: Send a note to our support email (customer.support@rsa.rohde-schwarz.com). If you don't get help that way after a week or so, PM me and I'll see what I can do-Rich

author: DaJMasta
author_rank: Super Contributor
timestamp: July 07, 2019, 10:06:18 pm
content: Quote from: Radiosonde on March 19, 2019, 08:30:43 pmI've gotten recovery media as a downloadable file from R&S technical support a couple of times just by asking, definitely a good place to start.
Looking for Tek 3054 hybrid schematics - input failure on channel 1 - Page 1
Forum section: electronics / testgear

author: n1ist
author_rank: Contributor
timestamp: June 26, 2019, 06:17:27 pm
content: I have a Tek 3054, and am looking for a schematic for the front-end hybrids. I have fed the probe cal squarewave into all four channels. Channels 2-4 are working fine, but channel 1 isn't. The waveform I am getting looks like the signal is passing through a low-value capacitor, so I am probably looking at a broken relay or trace. Amplitude changes with the vertical gain control, so that too implies that the open is rather early in the signal flow. Any ideas?Thanks./mike

author: tautech
author_rank: Super Contributor
timestamp: June 27, 2019, 12:24:12 am
content: Damaged 50 ohm input ?Overvoltage on Ch1 ?That's what I would focus on and either is possibility just in the analog passive components.As you have other working channels it should be too hard to localize exactly where the problem is.

author: n1ist
author_rank: Contributor
timestamp: July 06, 2019, 11:51:43 pm
content: Sometimes you get lucky - it was a bad solder joint between the hybrid pin coming from the BNC to the hybrid. Now to upgrade the firmware and calibrate it./mike
Keysight DSO1052B USB driver - Page 1
Forum section: electronics / testgear

author: Rx7man
author_rank: Regular Contributor
timestamp: July 06, 2019, 10:51:51 pm
content: I've googled and hunted for the Vendor ID, and I downloaded the 3 gig DVD for the unit (Painful on my connection), I absolutely can't find the USB driver for this scope... Where do I find it?

author: Rx7man
author_rank: Regular Contributor
timestamp: July 06, 2019, 11:11:07 pm
content: I did that and installed it, still comes up as "drivers not installed"

author: Rx7man
author_rank: Regular Contributor
timestamp: July 06, 2019, 11:19:11 pm
content: Well, not quite sure where it was suddenly found, but I got a "USB test and measurement device" driver that seems to work, not quite sure the steps I took to find it though..
ERASynth Micro $199 12.5MHz - 6.4GHz Portable Synthesizer Teardown, Review - Page 1
Forum section: electronics / testgear

author: Hugoneus
author_rank: Frequent Contributor
timestamp: July 05, 2019, 10:38:38 pm
content: In this episode Shahriar reviews the affordable ERASynth Micro 12.5MHz – 6.4GHz portable synthesizer with a built-in LCD screen. The USB powered instrument is fully open-source, Arduino compatible and can be operated in stand-alone mode. The system block diagram and operation of the instrument is presented.The measurements show some of the strengths and limitations of the instrument in AM/FM modulation modes and general CW use cases.You can watch the video here: [34 Minutes]youtu.be/I6iSovdd1Nc

author: Hugoneus
author_rank: Frequent Contributor
timestamp: July 06, 2019, 12:04:48 pm
content: It appears the final price is $250. I think $199 was the crowdfunding price.
Hantek DSO4202C problem (now with Hantek's answer) - Page 1
Forum section: electronics / testgear

author: VitalyP
author_rank: Newbie
timestamp: July 03, 2019, 03:41:50 pm
content: Hello. I've had a DSO4202C for a while now, and recently I needed to use its equivalent sampling mode. But when I change the mode to "Eqi-time" in acquisition menu, nothing changes at all: the minimum time res is still 2 ns/div and max sampling rate stays at 1 GSa/s. Has anyone had the same problem, and if so, do you know a way to fix it? Moreover, does anyone here actually have any Hantek scope with properly working Eqi-time? cause I've heard of a similar eqi-time related problems with their other scopes.P.S. I have the latest firmware from their website.

author: tinhead
author_rank: Super Contributor
timestamp: July 03, 2019, 08:53:05 pm
content: depends on model, equivalent sampling might not be really implemented. That's right. I spend years with Tekway/Hantek gears (check my profile), helping them to fix all the shitty issues with Hardware/Firmware, so e.g. on my old DSO1202B it was never properly implemente,d where on new DSO models they finally did, but not on MSO models based on same Hardware, so you can see no warranty that it will be implemented in your Firmware/model.The best ask them directly, maybe they have Firmware for your model with euivalent sampling implemented (no joke, sometimes they have Special Firmware versions which are not public).

author: VitalyP
author_rank: Newbie
timestamp: July 04, 2019, 07:47:54 am
content: Thanks for the reply tinhead! Although what you've said seems not-promising to meI already asked Hantek on email and their own little forum, but alas, still no reply. If I'll get them to do something useful, I'll post to this thread again. Guess next time I want to buy a scope I'll go with Rigol.

author: VitalyP
author_rank: Newbie
timestamp: July 05, 2019, 05:57:04 am
content: For anyone interested: Hantek replied to my email by simply stating that equivalent sampling is not working, and considering that this model is something like 4 years old, it looks to me that it never will. Well, it still is a decent scope for its money, but maybe it's time to look into Rigol ds1054Z or Siglent sds1202x-e.

author: bdunham7
author_rank: Super Contributor
timestamp: July 05, 2019, 07:59:48 pm
content: Quote from: VitalyP on July 05, 2019, 05:57:04 amNeither one of your suggested replacements has equivalent time sampling, at least not that is both documented and actually works. I have both scopes (1104x-e actually) and I'd call the Rigol system "equivalent time guessing" and I really haven't tried to characterize the Siglent yet. However, I have to ask--what is your use case for equivalent-time sampling? Do you need to do more than 100MHz on more than two channels at once? In that case, the Siglent 1204x-e can help, but not the ones you suggested.
Help identifing Tek Cover - Page 1
Forum section: electronics / testgear

author: zitt
author_rank: Regular Contributor
timestamp: July 03, 2019, 10:15:28 pm
content: I received this cover with my CMU2000. I think the seller used it as packing protection for the front cover instead of cardboarding up something.It obviously doesn't fit the CMU or anything else I have.Can someone help me identify the cover?

author: med6753
author_rank: Super Contributor
timestamp: July 03, 2019, 10:49:30 pm
content: Judging by the logo it's for a very recent instrument but hard to say for sure which one.

author: zitt
author_rank: Regular Contributor
timestamp: July 03, 2019, 11:30:54 pm
content: yeah; I wish there was a part number on it somewhere - but my quick exam didn't find one.

author: Andy Watson
author_rank: Super Contributor
timestamp: July 03, 2019, 11:50:19 pm
content: Same design and style as the TDS400/500 series and probably others in that family. Can you measure it?

author: james_s
author_rank: Super Contributor
timestamp: July 04, 2019, 02:25:30 am
content: That looks identical to the cover for my TDS784. The TDS500 and TDS600 series are physically identical.

author: zitt
author_rank: Regular Contributor
timestamp: July 04, 2019, 03:27:03 am
content: Measures 16 5/8" x 7 1/8 x 2 1/4"

author: james_s
author_rank: Super Contributor
timestamp: July 04, 2019, 04:22:49 pm
content: I'd bet money that's a cover for a TDS500/600/700 series scope.
Anritsu MG443B manual? - Page 1
Forum section: electronics / testgear

author: arkeo
author_rank: Newbie
timestamp: July 06, 2019, 06:57:36 am
content: Hi everybody,I bought an Anritsu MG443B level generator on ebay, but I can't find the manual on the net in any of the sites I know - and nothing useful on Google. Does anyone know if the PDF exists and from where can I download it?Thank you very much
Anritsu MS8607A - photos, dumps and file image - Page 1
Forum section: electronics / testgear

author: Mantrid
author_rank: Newbie
timestamp: July 03, 2019, 05:33:28 pm
content: Hello to all! I want to share information about the device I purchased, Anritsu MS8607A. This is a model for the domestic Japanese market, but it still turned out to be in Russia.This device is similar to MT8801 in terms of functionality and capabilities, acquired for the function of a spectrum analyzer, which it successfully performs.Unfortunately, I do not know English and I have to use a google translator. If you have questions, I will try to answer.All photos:https://yadi.sk/d/9EbhotTIHRu0QgAll dumps of EEPROM:https://yadi.sk/d/TAUBSg2EPu8MVgISO Image of PCMCIA card ( make dd utility from linux):https://yadi.sk/d/QZm8BhKn9lZoJQI hope this information will be useful to someone to study or repair a similar device.P.S.: special thanks tohttp://www.kolumbus.fi/oh5iy/HW/MT8802A.html- almost all ECAPs are bad, have a high or very high ESR (from 0.3 Ohm to 12.7 Ohm!)
Tek tds3012b upgrade or leave as is - Page 1
Forum section: electronics / testgear

author: Chalmml1
author_rank: Unknown
timestamp: July 04, 2019, 01:35:27 am
content: So I picked up an as is tds3012b off evil bay knowing that while it could have bad asics and the like it probably wasn't going to have a great deal if anything wrong with it.Turns out it was the connector between the mainboard and the power section that had come unplugged and now I have a perfectly happy scope.It appears to have valid cal until june 2020, my opening it to fix it has likely voided the legitimacy of said cal but it's only a 100Mhz instrument so breathing on it isn't going to change much I figure.Do I leave it as is as I don't really need a 500Mhz scope currently or upgrade it because why not?I don't currently require more than 100Mhz but will in the future as I want to test some circuits with high speed adcs and serial, hence why I got this scope rather than just going out and buying a siglent or the like.This is also my first foray into fully digital scopes hence not really knowing if the higher sampling res and bandwidth will impact on lower speed measurements, I assume more so as you approach the bandwidth limit for digital signalling and anything square wave than most other use cases.

author: james_s
author_rank: Super Contributor
timestamp: July 04, 2019, 02:28:30 am
content: Doesn't upgrading it require a full calibration? If it works and it meets your needs I think I'd be inclined to leave it alone. You'll be kicking yourself if you accidentally break it.

author: coromonadalix
author_rank: Super Contributor
timestamp: July 04, 2019, 04:39:09 am
content: Same here, works fine dont touch it, and enjoy it.

author: VK5RC
author_rank: Unknown
timestamp: July 04, 2019, 04:43:47 am
content: To misquote - 'There is no substitute for inches (GS/s)'.For digital - get a stand alone Saleae. IMHO
HMCAD1073 from Hittite - 16-bit Dual channel 400MSPS ADC - Page 1
Forum section: electronics / testgear

author: pascal_sweden
author_rank: Super Contributor
timestamp: July 04, 2019, 03:57:50 pm
content: This seems to be like the big brother of HMCAD1520 as it provides 16-bit resolution.It is however only Dual channel and not Quad channel.http://analog.alfine.pl/rf-microwave?download=88:ad-converter-0808Was this ADC chip ever produced? How much does it cost?Where to find the data sheet and a distributor who still has it on stock?Is there a new alternative if this ADC chip is obsolete in the mean time?

author: exe
author_rank: Unknown
timestamp: July 04, 2019, 04:45:22 pm
content: Fromhttps://octopart.com/search?q=HMCAD1073: "Your query, HMCAD1073, matched zero parts." . There is no even datasheet. Looks like either it doesn't exist, or it has different name.There are other ADCs available, check these:https://www.analog.com/en/parametricsearch/10826#/p193=|3|16&p3062=2

author: Kleinstein
author_rank: Super Contributor
timestamp: July 04, 2019, 06:20:15 pm
content: Such an ADC could be US military only.
XJW01 LCR Bridge in Unassembled Kit Form? - Page 1
Forum section: electronics / testgear

author: Chris56000
author_rank: Frequent Contributor
timestamp: September 29, 2018, 07:10:18 pm
content: Hi!The Chinese XJW01 LCR Meter was recently updated in 2017 to a metal–case enclosure with a matrix of red/green/blue pushbuttons and an external ac adaptor.However, I saw a YT Video (Russian) showing one of these in unassembled kit form with the bare pcb and a large bag of components – can anyone point me in the direction of one of these kits that comes like this, completely unbuilt, so I can write documentation to save me having to unsolder everything from the completely pre–assembled one I bought please?Chris Willams

author: Specmaster
author_rank: Super Contributor
timestamp: September 29, 2018, 07:11:49 pm
content: They can sometimes be found on Ebay (UK)

author: cnqhdszq
author_rank: Regular Contributor
timestamp: June 18, 2019, 08:31:35 am
content: You can buy it fromwww.taobao.com

author: Andbro
author_rank: Regular Contributor
timestamp: July 02, 2019, 08:04:01 pm
content: Hi,you do can buy on Taobao if you don't read Chinese???Thank

author: ebclr
author_rank: Super Contributor
timestamp: July 03, 2019, 06:00:28 am
content: You use google translator don't need to know Chinese, Just need to know how things work in 2019
Hp HDSP-211x Tester - Page 1
Forum section: electronics / testgear

author: hyperneogeo
author_rank: Newbie
timestamp: July 02, 2019, 08:36:18 pm
content: Found these at a recycle shop in the bay area a few years ago. They both work and light up DIP leds. What's interesting is they both came from the applications department of the optoelectronics division of HP. So I'm guessing they used these to show off their HDSP leds to companies/possible customers. They are really cool, but not really sure what to do with it hah.
Sigrok & SDS2000X - Page 1
Forum section: electronics / testgear

author: colorado.rob
author_rank: Frequent Contributor
timestamp: June 27, 2019, 04:04:43 am
content: I am trying to use Sigrok with a Siglent SDS2000X scope via LAN.I think I am following the correct instructions for this, but the output seems to indicate it doesn't understand "vxi".sigrok-cli --driver=siglent-sds:conn=vxi/10.0.0.203 --scansr: serial: Attempt to open serial port with invalid parameters.Anyone know the proper incantation to make this work?$ sigrok-cli --versionsigrok-cli 0.7.0Libraries and features:- libsigrok 0.5.0/4:0:0 (rt: 0.5.1/5:0:1).- Libs:- glib 2.58.1 (rt: 2.58.3/5803:3)- libzip 1.5.1- libserialport 0.1.1/1:0:1 (rt: 0.1.1/1:0:1)- libusb-1.0 1.0.22.11312 API 0x01000106- libftdi 1.3- Host: x86_64-redhat-linux-gnu, little-endian.- SCPI backends: TCP, serial, USBTMC.- libsigrokdecode 0.5.0/4:0:0 (rt: 0.5.2/6:0:2).- Libs:- glib 2.58.1 (rt: 2.58.3/5803:3)- Python 3.7.1 / 0x30701f0 (API 1013, ABI 3)- Host: x86_64-redhat-linux-gnu, little-endian.

author: tautech
author_rank: Super Contributor
timestamp: June 27, 2019, 07:02:26 pm
content: Quote from: colorado.rob on June 27, 2019, 04:04:43 amPM sent.Sigrok developer email supplied.

author: colorado.rob
author_rank: Frequent Contributor
timestamp: June 28, 2019, 01:45:18 am
content: Apparently VXI support in libsigrok has been broken in Fedora since Fedora 28. VXI support is no longer included in libsigrok because of the removal of RPC support from glibc.I filed a bug report and included a patch to the RPM spec file that fixes the issue.https://bugzilla.redhat.com/show_bug.cgi?id=1724865It probably should be fixed upstream as this is likely to impact other Linux distros soon.Even with that fix, VXI support appears broken in sigrok, at least for the SDS.

author: colorado.rob
author_rank: Frequent Contributor
timestamp: June 30, 2019, 03:03:57 am
content: Well, the quick and dirty test fails with the new firmware.I updated the sigrok siglent-sds driver code to enable the 16 digital channels on the SDS2000X series. It fails to get an expected response from the DSO. And playing around with PyVISA, I cannot enable a digital channel via SCPI.What SCPI commands did Siglent actually implement here?

author: tautech
author_rank: Super Contributor
timestamp: July 01, 2019, 10:12:46 am
content: Quote from: colorado.rob on June 30, 2019, 03:03:57 amhttps://www.siglentamerica.com/wp-content/uploads/dlm_uploads/2017/10/ProgrammingGuide_PG01-E02B.pdfDIGITAL Commands P72
Recording start of RF waveform - Page 1
Forum section: electronics / testgear

author: Gsewell
author_rank: Newbie
timestamp: June 30, 2019, 03:04:49 pm
content: I have the Siglent SDS 1202x-e scope and want to be able to capture the leading edge of my ham radio CW signal to took for over shoot at the beginning of the signal. I have read the manual and searched for videos with no success. Does anyone have a video or procedure to do this? I have it connected now and can see the waveform, but I need to record it on the scope and play it back.ThanksGary

author: apblog
author_rank: Regular Contributor
timestamp: July 01, 2019, 12:10:57 pm
content: I don't have your scope, but the procedure is pretty much the same for any of them. I do this same measurement with my ancient Rigol DS1202CA.Key up a CW waveform with your scope on auto trigger and adjust your vertical volts/div so the trace fills about 1/2 of the screen.Change the trigger to normal and set the trigger level a little above the top of the steady state waveform.Set the scope to single shot and key up. You'll get one sweep that shows the beginning of your transmission. If you don't get anything, lower the trigger level until you do.Play with the horizontal time/div as required.I don't know what you mean by "record it and play it back". Just screenshot it once you have the single capture.And of course make sure to use an appropriate RF attenuator or RF tap so you don't blow up your scope.
GW Instek GPE x323 PSU modding - Page 1
Forum section: electronics / testgear

author: John B
author_rank: Frequent Contributor
timestamp: June 27, 2019, 01:41:41 am
content: I've been thinking about modding the pots on a GPE 3323. They are a single turn pot controlling a 0-32V range.For some background info, I have looked through these excellent review tear down videos here:https://www.eevblog.com/forum/testgear/gw-instek-gpe-2323-rs-pro-rpe-2323-review/I also found another thread, but can't remember the link, where the Bourns 3856 series of pots were recommended as a drop in replacement, which are a 3.75 turn pot.However I am wondering if anyone has put a 10 turn pot in? Using a 3.75 turn pot is a still a lot of effort to fit, not to mention far too expensive. I'd be looking at $80-100 for only 2 pots, which is putting the PSU in a different price category. The 10 turn pots are far cheaper and more readily available.In the tear down video above, you can see that there are plastic risers coming off the front panel where the standard pots mount. If they were cut off, it looks like a 10 turn pot could mount flush with the front panel. I measured 23mm from the front panel to the PCB. I didn't unscrew the PCB so it's difficult to tell whether a 10 turn would interfere with any surface components, but it looks promising.
Bench DMM from Portable Conversion (Aneng Q1 for $50 All) - Page 1
Forum section: electronics / testgear

author: Mechatrommer
author_rank: Super Contributor
timestamp: June 26, 2019, 12:29:35 am
content: long story short.. bought it last year the moment people went frantic. every con dave mentioned in the video is the pro for this, so i know this is a perfect candidate. once arrived i tried to make the conversion by breaking out the lcd using flying wires, failed, not sure what went wrong, some synchronization issue? or impedance mismatch of zebra strip? who knows. got feed up and put it in plastic in the store until few days ago, because browsing Fluke 8840 or Agilent 34401, their depth are too much for my bench, so got no option have to revive this project since my rubidium need repairing requiring this... i went different route after lcd breakout failure, i decided to cut the pcb into 3 pieces and reconnect traces where apropriata. add the ac 50hz transformer old part laying around, 12v fan and 3.3v dc ldo psu, glue and cut here and there,and additional sleep prevention pic10f206 circuit that presses appropriate button in every minute (pull low to GND) voila! now i have bench dmm that wont sleep on me in perfect form factor and size for about guesstimated $50 + a sandwich box to put probes acc etc thanks to Uni-T for the innovative idea... enjoy the pics fwiw.

author: windsmurf
author_rank: Frequent Contributor
timestamp: June 26, 2019, 12:32:56 am
content: Wow good job!But I'd redo the input jack faceplate

author: Mechatrommer
author_rank: Super Contributor
timestamp: June 26, 2019, 12:51:00 am
content: i think there's nothing wrong with input jack as the functions are still the same, only have to turn head 90 degree to the side to read the labels, and i dont have that kind of recessed and protected/covered bnc input as replacement. i think i need to erase some labelling though such as the "auto power off" because its not auto power off anymore. i dont want to spend too much time on this so i'll reuse everything that i can.
Calibration of Keithley 2400 after 1N4579A has been replaced w/ LM199AH-20/883 - Page 1
Forum section: electronics / testgear

author: eplpwr
author_rank: Regular Contributor
timestamp: June 19, 2019, 08:30:59 pm
content: Hello!I've recently bought a K2400 for a decent price at fleabay:https://www.ebay.com/itm/keithley-2400-sourcemeter/283434951856?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649It works great, but the bad choice of voltage reference makes it move around like it's seasick. I can accept a certain offset, but not whis "wigglyness" with swings up and down. So. I changed VR600 / 1N4579A for an LM199AH-20/833 (could be fake but keeps to specs so far).Now I want to re-calibrate since reference voltage has increased almost 8%. One way is to calibrate multiple times, since a a calibration of more than +/- 1% is considered "invalid". OR - maybe I could hack som calibration constants directly, which I unfortunately don't know how to do. (Have TL866 Mk II.)Even if the SMU is outputting an incorrect voltage, the voltage is much most stable now, compared to using the 1N4579A as reference.Also, to remove noise, a lot of the opamps were replaced with modern equivalents, thought to decrease the noise level overall. This is a separate topic.Using STD calibration, outputting e.g. 20V results in 21.6V and thus OVP problem.Any experienced modders out there what has any suggestions?

author: TheSteve
author_rank: Unknown
timestamp: June 19, 2019, 08:50:27 pm
content: I didn't find the stock reference was that bad, but I changed mine to a well aged LM399 from a 34401A as it was a quick and fun project. I don't recall how much the delta was after the change but I had no errors calibrating it. I used a script from xDevs but it requires a 3458A. The script has some issues, I have submitted a fix to TiN but I don't believe he put it on the website. If you do happen to have a 3458A I can get it to you. You could also mod the script to work with a different DMM.The xDevs page is here:https://xdevs.com/fix/kei2400/#diycal

author: eplpwr
author_rank: Regular Contributor
timestamp: June 24, 2019, 06:36:53 am
content: Yes! Using the script by TiN, I have now a calibrated 2400.Since I'm using some E5810A's to connect to my GPIB devices, I had to do some minor script changes to use VXI, and after that it went smoothly, both talking to the 2400 and the 3458A.Thanks @TheSteve - and TiN for the script. Since I'm building some LTZ references, it sort of itches to replace the Vref in the 2400 again, but that's for another day.

author: TheSteve
author_rank: Unknown
timestamp: June 24, 2019, 07:58:32 am
content: Glad it worked out. I see TiN did update the page and added the VXI version of the script I submitted to him with the fixes. I use an E5810A as well.

author: TiN
author_rank: Super Contributor
timestamp: June 25, 2019, 04:19:33 am
content: E5810A is gold. No more linux-gpib shenanigans.eplpwrWould be interesting to read more and see more test results of your modifications, especially if you have "before/after" tests.I barely use 2400 for much stuff after I got proper calibrators in lab.
Need a schematic for a LeCroy 9100 Arbitrary Wave Generator - Page 1
Forum section: electronics / testgear

author: Kinkless Tetrode
author_rank: Regular Contributor
timestamp: June 24, 2019, 09:53:13 pm
content: Hi all,Does anybody know where I can get a hold of a schematic and service manual for a LeCroy 9100 Arbitrary Dual Waveform Generator? Thanks.
Lecroy WavePro 960 -- how to access maintenance/service menu? - Page 1
Forum section: electronics / testgear

author: apblog
author_rank: Regular Contributor
timestamp: June 26, 2019, 09:03:13 am
content: I've heard that there is a service menu on this scope.Does anyone know how to access it? I've been googling for an hour with no luck.Thanks

author: Jwalling
author_rank: Unknown
timestamp: June 26, 2019, 09:29:46 am
content: Try these. Be CAREFUL!9472 Service Center19641 Production Access11011969 Kernel Access22872201 Developer Access

author: Mr Nutts
author_rank: Regular Contributor
timestamp: June 26, 2019, 10:27:20 am
content: Isn’t this for the later Windows scopes?This is the procedure for the WR2LT and the WP900 series:Quote

author: apblog
author_rank: Regular Contributor
timestamp: June 26, 2019, 03:28:27 pm
content: Thanks. I tried that process several times and nothing happened.Quote from: Mr Nutts on June 26, 2019, 10:27:20 am

author: Jwalling
author_rank: Unknown
timestamp: June 26, 2019, 05:16:05 pm
content: Quote from: Mr Nutts on June 26, 2019, 10:27:20 amOops. Didn't check that...
Budget USB Packet Sniffer - Page 1
Forum section: electronics / testgear

author: TimCambridge
author_rank: Regular Contributor
timestamp: June 24, 2019, 01:00:36 pm
content: I'll follow the rules and skip the details because there's a piece about this in the Projects forum :https://www.eevblog.com/forum/projects/ezsniffer-hardware-usb-packet-sniffer-on-a-budget/
Impedance Measurement Using a Current Probe and Siglent Bode Plot II - Page 1
Forum section: electronics / testgear

author: graybeard
author_rank: Frequent Contributor
timestamp: June 23, 2019, 08:53:28 am
content: This video demonstrates how to measure impedance from 10Hz to 10MHz using a Tektronix P6042 Current Probe, Siglent SDS1104X-E Oscilloscope with Bode Plot II, and a Siglent SDG2042X function generator. I show examples of impedance plots of resistors, inductors, speakers, and standard and polarized capacitors. The results are good from 10Hz through 1MHz and usable to 10Mhz.You can download a copy of the charts and example EXCEL files hereI hope you enjoy this.Chris

author: Chriss
author_rank: Frequent Contributor
timestamp: June 23, 2019, 10:05:06 am
content: Thank you for this nice video and post.I really like it.My best regards.Chris.Sent from my SM-J500F using Tapatalk

author: graybeard
author_rank: Frequent Contributor
timestamp: June 24, 2019, 04:47:25 pm
content: Here is an example impedance curve I measured using the set-up described in the video.This is the label on the 41 year old bag of capacitors:This is the capacitor being measured. You can see the oscilloscope probe connected closest to the device and the force leads at the lead tips.This is the capacitor impedance curve showing a self resonance frequency of 700KHz.These are the series R, L, and C values calculated at each frequency from |Z| and phase(Z).It shows the measured capacitance is the nominal 0.22µF. The ESR at resonance is ≅0.12Ω which matches the minimum of the |Z| curve. The ESL is ≅220nH which is the same value you would get from calculating it from the resonance.Chris
Brymen 867s - mA, uA range - max. current - Page 1
Forum section: electronics / testgear

author: bmdaly
author_rank: Contributor
timestamp: June 23, 2019, 10:07:50 pm
content: The Brymen 867s multimeter has "MAX .6A" written on the jack for milli and micro amp range, but it has a .44A fuse on this current range.Can anyone explain this convention?

author: Specmaster
author_rank: Super Contributor
timestamp: June 23, 2019, 10:29:47 pm
content: A fuse will carry its full rating for a very long time indeed and may never blow, so a fuse rated at .44A would likely carry that for ever. Fuses will typically take around at least 50% overload to blow instantly and so the rating of .6A max sounds about round right to me because if the take the .44A and apply a 25% overload, it come to .55A. That means that the fuse would be happy if required to carry .6A for a very long time, otherwise you'd be constantly buying some very expensive fuses for the slightest overload if they were designed to blow at the stated current. The meter is more then capable of withstanding that amount of energy.
Is there any test equipment NOT made in China? LOL - Page 1
Forum section: electronics / testgear

author: itproman
author_rank: Newbie
timestamp: June 23, 2019, 08:45:30 pm
content: From reading some posts from past years,and doing a little online detective work,I discover:*Tenma 72-1020= Uni-T T-804 (even page 9 in the "Tenma" manual shows the "uni-T" logo on the front face.-they thought nobody'd notice!*B&K Precision 5491B=Tonghui TH1942*Keysight 34461a is made in Malaysia*GW Instek's head office is in Taiwan.I remember an old episode of The Saint TV Series(1962-1969) "The Master Plan",where Burt Kwouk says : "In time China will subjugate the west.It will take time,but it will happen."Obviously -it did.So much for patriotism! lolAnyway,just considering my options.Since I only need a bench dmm for hobbyist and ham radio,might as well just buy something cheap for now like the Tenma 72-1055,or Uni-T,then upgrade later.

author: 0culus
author_rank: Super Contributor
timestamp: June 23, 2019, 09:11:35 pm
content: I would guess only the really high end stuff is made in the same country the engineers are in. Last I checked LeCroy has a factory somewhere on the east coast.I wouldn't be surprised if exceptionally high end stuff such as Keysight's UXR oscilloscopes are at least assembled here, as those are not high volume items at all.

author: JDubU
author_rank: Frequent Contributor
timestamp: June 23, 2019, 09:18:15 pm
content: Quote from: blueskull on June 23, 2019, 09:09:38 pmKeysight 1000x series oscilloscopes are made in China.

author: nctnico
author_rank: Super Contributor
timestamp: June 23, 2019, 09:37:42 pm
content: Quote from: blueskull on June 23, 2019, 09:09:38 pmR&S assembles their equipment in Europe. For some types of cheaper equipment they have to cut some corners on the mechanical side (like not bolting BNCs to the chassis) in order to reduce assembly time.

author: TheSteve
author_rank: Unknown
timestamp: June 23, 2019, 10:17:19 pm
content: Keysight also manufactures in Singapore.

author: EEVblog
author_rank: Unknown
timestamp: June 23, 2019, 11:43:52 pm
content: Many Fluke's are still made in the USAKane Test (UEi) also make some meters in the USAThe 121GW is made in South KoreaMany Sanwa's are made in JapanKeysight's are made in MalaysiaGossen's made in GermanyR&S Made in the EUand heaps of others.

author: Mechatrommer
author_rank: Super Contributor
timestamp: June 24, 2019, 01:36:17 am
content: Quote from: itproman on June 23, 2019, 08:45:30 pmMalaysia is no Chinaeven though we have chinese citizens migrating due to colonial pre-independence age. If its based on race of citizens, we are also India
Fluke 87V Bargraph Scale - Page 1
Forum section: electronics / testgear

author: Unknown
author_rank: Unknown
timestamp: June 30, 2019, 11:10:08 pm
content: I've been using a Fluke 87V for a while and I've always wondered why they chose to break the scale up into quarters when the scale max is 6x10^x. It seems like 6 divisions would make more sense. Even in "Hi-Res" mode which uses 20k counts it shows 6x10^x as the max for a given range.Do you know why the max reading is always 6x10^x rather than 2x10^x, or why Fluke chose to divide their analog scale up into steps of 6/4?

author: windsmurf
author_rank: Frequent Contributor
timestamp: July 01, 2019, 06:50:17 am
content: Maybe because the original 87 was a 4000 count meter?
has anyone used the Megger AVO835?  - Page 1
Forum section: electronics / testgear

author: Perrin21
author_rank: Regular Contributor
timestamp: June 23, 2019, 05:53:11 pm
content: I have been researching multimeters and have come across the Megger AVO835 and it looks to have an enormous feature count, high quality and reasonable price. Has anyone used this meter and how does it compare to a Fluke? I'd love to see a Teardown from Dave if he has one. it feels like this meter has slipped under the radar.
121GW AUTO Range in Ohms Not Working - Page 1
Forum section: electronics / testgear

author: K1JOS
author_rank: Regular Contributor
timestamp: June 23, 2019, 12:48:31 pm
content: I received my EEVBlog 121GW (firmware v1.57) a week ago and just got around to using it. It has an odd problem in the Ohms position it will not go into AUTO range. It stays on lowest range up to 500 ohms and reads accurately but I soon as it is faced with 501 ohms or higher it stays in OFL. All other modes have AUTO on as I cycle the meter switch including capacitance and Megs. I have tried to rest it with no joy. Any advice appreciated.Jerry NY2KW

author: coromonadalix
author_rank: Super Contributor
timestamp: June 23, 2019, 02:53:49 pm
content: you have the v2 firmware now .... try it ?And for further problems if any, you have 3x 121 gw dedicated threads hereEEVblog 121GW Multimeter IssuesEEVBlog 121GW Discussion threadEEVBlog 121GW Multimeter Firmware Details

author: K1JOS
author_rank: Regular Contributor
timestamp: June 23, 2019, 04:05:29 pm
content: will try.
TEK 7A19 - Page 1
Forum section: electronics / testgear

author: frantisek
author_rank: Regular Contributor
timestamp: June 16, 2019, 05:18:16 pm
content: Hello. I would like to ask if the 7A19 plugin is compatible with TEK 7603 (7633). I have a problem that they don't match the vertical range. Thanks.

author: med6753
author_rank: Super Contributor
timestamp: June 16, 2019, 05:36:56 pm
content: Yes, it is compatible even though the 7A19 has 600MHz bandwidth and the 7603 is only 100MHz bandwidth. But note that the 7A19 is a 50 ohm impedance input. That could be the source of your measurement errors if the device feeding the 7A19 is loaded down by that 50 ohm input.

author: 0culus
author_rank: Super Contributor
timestamp: June 16, 2019, 05:43:37 pm
content: I use the 7A19 in my 7904A exclusively either with a transmission line or with a P6201 active (FET) probe, which is designed to be terminated in 50 ohms.

author: David Hess
author_rank: Super Contributor
timestamp: June 16, 2019, 07:34:15 pm
content: The 600 MHz 7A19 should work fine in any of the 100 MHz 7600 mainframes. The Tektronix catalogs even show this configuration because the 7A19 was the only 50 ohm variable sensitivity amplifier until the 7A24 came out 2 years later so if you wanted a 50 ohm input without a feedthrough termination, the 7A19 is what you used.

author: frantisek
author_rank: Regular Contributor
timestamp: June 17, 2019, 11:00:45 am
content: When calibrating with PG506, only the 0.1V range corresponds to 7A19. On other ranges, the amplitude on the CRT 7603 does not match the applied voltage from the PG 506.

author: med6753
author_rank: Super Contributor
timestamp: June 17, 2019, 12:44:30 pm
content: Then you'll have to determine if the issue is the plug-in or the mainframe. The best way to do this is via substitution. Do you have another vertical plug-in that you can try? That way you can quickly determine which unit has a problem.

author: frantisek
author_rank: Regular Contributor
timestamp: June 17, 2019, 02:16:06 pm
content: 7A26 behaves correctly. So the problem is clearly in 7A19. If I select a 0.1V sensitivity at 7A19 and change the output level from PG506, the CRT display is correct and the amplitude changes and responds. On the other ranges 7A19 is the amplitude that does not match the voltage of PG 506. Perhaps I wrote it clearly.

author: med6753
author_rank: Super Contributor
timestamp: June 17, 2019, 02:57:41 pm
content: It seems apparent you have attenuator issues with the 7A19. Probably due to application of excess signal. There is a limiter circuit with fuses. I would check them. A copy of the manual is available here:https://neurophysics.ucsd.edu/Manuals/Tektronix/7A19%20Amplifier%20Manual.pdf

author: frantisek
author_rank: Regular Contributor
timestamp: June 24, 2019, 10:36:08 am
content: In attenuator, all attenuators are tested, measured, and OK. If I select 0.1V, everything is OK, other ranges are wrong.