hybridfree/eevblog-posts huggingface dataset:
LeCroy DDA-5005A probe options for full 5GHz bandwidth - Page 1
Forum section: electronics / testgear

author: suspension
author_rank: Regular Contributor
timestamp: June 16, 2024, 03:45:28 am
content: HelloI am thinking of buying a LeCroy DDA-5005A DDA to be used as an oscilloscope. Used units in ebay don't come with probes. I read in this forum that the connector type is different: more info in here:https://amplifier.cd/Test_Equipment/LeCroy/DDA5005A_XXL/DDA5005A_XXL.htmlFew questions:1. If I were to measure up to 1GHz, can passive probes be used?2. To go to max bandwidth, should I use active probes? Or can passive probes be used still?3. Are there non lecroy probes that connect to the scope directly without a BNC converter?4. The input is 4V peak to peak. Is it possible to protect this input from accidently applying higher voltages? say 12 V?ThanksS

author: smaultre
author_rank: Regular Contributor
timestamp: June 16, 2024, 07:49:44 am
content: This class of oscilloscopes used only as HF stuff. They have 50Ohm input, uncompatible with BNC type 10:1 probes.You can use passive matched-line 50Ohm probes stuff, but only 4V peak to peak.Or buying Lecroy active probe with 5:1 or so..
Is 500MHz bandwidth available in both channels simultaniously in SDG6052X - Page 1
Forum section: electronics / testgear

author: suspension
author_rank: Regular Contributor
timestamp: June 14, 2024, 02:00:49 am
content: HiDoes any one know if the max bandwidth which is advertised as 500MHz for siglent SDG6052X is available simultaneously from both channels?ThanksSuspension

author: tautech
author_rank: Super Contributor
timestamp: June 14, 2024, 02:29:27 am
content: Yes of course.Equal Phasing may not be precise but can be adjusted to be so.
Zt-703s Current Bug - Page 1
Forum section: electronics / testgear

author: nihilon
author_rank: Newbie
timestamp: June 13, 2024, 10:29:17 pm
content: I did some searching and found nothing so here we are. I have a ZT-703s that is having this weird declining current bug that I wanted to see if anyone else has run into. It isn't a deal breaker but it is annoying. When going from volts to DC mA, it will drop all the way to limit of 250mA. It will stop and read correctly if the mode is changed from mV to amps, then back to mV.Circuit is a red LED (2.2 volts rated), a 10K ohm resistor, and a 9v battery at about 8v. it doesn't matter if the power source is less or more.
Tektronix !A! and 2465A - Page 1
Forum section: electronics / testgear

author: mike zias
author_rank: Newbie
timestamp: June 11, 2024, 11:53:54 pm
content: I have an old Tektronix 1A1 and a newer 2465A. On either one I would like to change the outputs, from Ch.1 output on the 1A1 or the ch.2 output on the 2465A, to a vertical output. The 1A1 has all the functions on the mode switch but I can't tell from the schematic if the "Add" is done in the 1A1 or only in a scope it plugs into. I want to use my 133 power unit for the 1A1 and not buy an old 500 series scope. The 2465A does have all the functions somewhere so it should be possible to move a wire from the ch.2 to the vertical output. Any thoughts on this?
UTD2102CEL 100Mhz 1GS/s Digital Scope - Mini-teardown - Page 1
Forum section: electronics / testgear

author: IanJ
author_rank: Unknown
timestamp: July 22, 2011, 03:02:34 pm
content: Hi all,Curiosity got the better of me so I thought I'd take the lid off my UTD2102CEL 100Mhz scope and have a look.But before I start, here's something I noticed......the Tenma 72-8705 scope is identical, so I guess Farnell are re-badge'ing UTD's......Anyway, here's my mini-teardown:-In operation on my workbench:With the rear plastic cover removed:Metal cage removed:A bunch of internal shots:Looking for the memory, there I guess on the underside of the main board:

author: tinhead
author_rank: Super Contributor
timestamp: July 22, 2011, 04:35:29 pm
content: awsome IanJ, look complettly different than what i know (attached 2052CEL rev2.05) from UNI-Twhat revision of PCB yours ? I wish you could shot and post bigger pictures.Definitely better than the old revision, different FPGA, sample memory within FPGA instead ofexternal (or maybe on bottom side?), original AD9481 instead of these cheap ans noisy HWD9481.What really crap is the PSU mounted right above ADCs/FPGA/DSP, not only because EMI or distortion(look 4.jpg and the mains cap right above DSP,who the fuck desiged this?), but also because of pure security.A piece of shielding between PSU and main PCB, like e.g. HanTekway is using, would not costs that muchand it would improve this scope.

author: IanJ
author_rank: Unknown
timestamp: July 22, 2011, 06:16:02 pm
content: I have much bigger pics obviously, but have to be careful with the sizes I post as my domain is hosted on a 2nd DSL line.Hmmm, you got me to thinking, I have some really thin aluminium plate so might build a small shield around the PSU, at least between the main board and the psu anyways.Here's another couple of pics with pcb rev detail etc:-

author: tinhead
author_rank: Super Contributor
timestamp: July 22, 2011, 07:20:53 pm
content: ok, v1.04 but the timestamp is everything we should know 2010.07.07.So it seems to be a re-design (which they promised after some negative feedback from users)and not just old model with new display (like the one which i posted).I doubt there is enough space for aluminium plate, i would probably make a new PSU PCB, a bit longer (and with alu plate),a piece of PCB didn't cost that much.

author: saturation
author_rank: Super Contributor
timestamp: July 22, 2011, 08:54:33 pm
content: Great job, plus we get a good commentary from our forum DSO gurus, its priceless.

author: Mechatrommer
author_rank: Super Contributor
timestamp: July 22, 2011, 11:16:21 pm
content: Quote from: Squonk on July 22, 2011, 10:42:14 pmthere is another. but he seldomly popped out.

author: unseenninja
author_rank: Regular Contributor
timestamp: June 12, 2024, 08:20:21 am
content: What a shame that you didn't upload the pictures here on eevblog. Now, this thread (which is indexed by google) is just a waste of time.
Keithley 2611B  SMU photos - Page 1
Forum section: electronics / testgear

author: RAQU_PL
author_rank: Contributor
timestamp: June 09, 2024, 03:55:17 pm
content: Filling the gap in the forum with some teardown pictures of my Keithley 2611B SMU.Performance check is a bit laughable because of cal date: KS34465 2016 and K2611B 2013 yet are rather close to each other and spec, after 30 min warmup.

author: RAQU_PL
author_rank: Contributor
timestamp: June 09, 2024, 03:56:30 pm
content: More pics.

author: RAQU_PL
author_rank: Contributor
timestamp: June 09, 2024, 03:58:47 pm
content: More pics and 3d foot model
Siglent SDS800X HD Internal Memory Space - Page 1
Forum section: electronics / testgear

author: TomKatt
author_rank: Frequent Contributor
timestamp: June 08, 2024, 01:59:22 pm
content: I noticed when saving some setups to the internal memory that the new File Manager window displays 1.7G/1.8G for memory space. The way the bar graph is displayed infers that .1G (100MB) is available. This is the same memory space used for saving screenshots etc if no USB drive is inserted.How are others using and organizing the internal memory? The new File Manager allows folder management, so I’d guess it would make sense to create folders for various file types such as setups, screenshots, reference waves etc. But I’d also be concerned whether the scope OS needs some minimum storage space to operate properly…. I’m sure that using a USB drive is the preferred option, but some things like setups would be more convenient to have readily available from internal storage. The help system discusses the File Manager but makes no mention about how much space to use or leaving any free storage available for the system.Are others organizing the internal storage by creating folders, or just saving everything to the default home location? Or using a USB drive to save everything?Just curious.

author: KungFuJosh
author_rank: Super Contributor
timestamp: June 08, 2024, 04:05:14 pm
content: Most people use a USB drive. These sorts of questions should be posted in the main thread:https://www.eevblog.com/forum/testgear/siglent-sds800x-hd-12-bit-dsos-coming/
0.7x Barlow Lens for this Stereo Microscope possible? - Page 1
Forum section: electronics / testgear

author: dredd
author_rank: Contributor
timestamp: June 06, 2024, 04:08:27 am
content: Hi.I needed stereo microscope for soldering work, and got this used one:It has WF10X eyepieces and switchable 2X and 4X objective, you rotate it 180deg to select.Now I read everywhere that I'm better off with 0.5x or 0.7x Barlow Lens at the bottom, to reduce magnification and increase working distance. Most common barlow lenses have 48mm diameter screw-on threads.But this scope has no threads at bottom, see "Pic 1", was a bit of disappointment.What do I do? Much appreciated!

author: jfiresto
author_rank: Frequent Contributor
timestamp: June 06, 2024, 05:07:08 pm
content: That looks to me like a typical, 10X/20X dissecting microscope. Here, is an ad for the one I have, I bought for cheap to learn on, that shows a typical use and user:(Looking at her hands and makeup, I would say that is an older model posing as a high school student.)I expect you belong to a different demographic that needs a different microscope, a "routine, system microscope", which you can add to or change – for example, with different stands, eyepieces, barlow lenses, and so on – to address a wide range of applications.

author: dredd
author_rank: Contributor
timestamp: June 07, 2024, 05:50:41 am
content: Yes, typical stereo scope, I'm not in position to buy new AmScope, but I want AmScopeIt seems I have the solution, I bought this 0.3X Barlow lens on Aliexpress with 42mm thread, that I will jam somehow into the bottom of the black plastic conical housing I have, which is 40mm inside diameter at the bottom.https://www.aliexpress.com/item/1005004924531709.htmlAmScope SM-3 ManualSM-3_Manual_151001.pdfhas same barlow lens arrangement (see page 15), which gives me hope.This will reduce magnification from 20x,40x to 7x,14x with increased working distance. Now I need boom-arm stand lol

author: jfiresto
author_rank: Frequent Contributor
timestamp: June 07, 2024, 06:13:41 am
content: That often gives not half bad results because of the low numerical aperture of the barlow lens.Rather than jam, you could glue to the conical housing, a 42mm to something-at-least-as-big camera thread adapter and then be able to add or remove the lens or other accessories. What is the plastic?

author: dredd
author_rank: Contributor
timestamp: June 07, 2024, 06:26:02 am
content: Some plasticky feeling hard plasticMaybe has carbon fibers in it.Yea, I heed to find something bigger with inner 42mm thread, it feels like a challenge...

author: tautech
author_rank: Super Contributor
timestamp: June 07, 2024, 08:17:28 am
content: Quote from: dredd on June 07, 2024, 06:26:02 amLook at ~40mm PVC waste pipe and you might know someone local that can spin it to size for just a simple firm press fit.
Yokogawa 701922 differential probe - bipolar power supply? - Page 1
Forum section: electronics / testgear

author: 0xdeadbeef
author_rank: Super Contributor
timestamp: July 08, 2015, 09:04:11 pm
content: More or less a theoretical question, but anyway: I could get a Yokogawa 701922 for a good price which seems to be a rebranded Testec TT-SI 200, but there's one catch (in addition to the very limited +/-20V differential voltage range), namely that the Yokogawa version has some proprietary Lemo connector instead of the default Testec one. In the 701922's manual the connector's pinout is shown, but it's +/-12V while the Testec TT-SI 200 has a single supply from 3.3V to 16V (but the official voltages are either 6V or 9V). I would assume that only +12V and GND are actually used and that I could use a 9V battery as well, but I'm hesitant to buy a probe with a very limited voltage range and the risk of having to tinker and mess around with a +/-12V supply.So does anybody know for sure if the Yokogawa 701922 can supplied by a single positive voltage (like 5V or 9V) just as the Testec TT-SI 200?

author: aronake
author_rank: Frequent Contributor
timestamp: May 09, 2024, 02:35:16 am
content: Bringing back this extremely old thread.Anybody who have the answer to this?I am also curious about how sensitive these Yokogawa differential probes are to input voltage. It seems the Testec version is run on 6V to 9V. Yokogawa on 12V, or maybe +/- 12V. So seems rather wide. But the Yokogawa may have been modified.

author: aronake
author_rank: Frequent Contributor
timestamp: June 06, 2024, 03:35:05 pm
content: If anybody is interested in knowing, the Yokogawa 701922 require both the positive and the negative 12V to work properly. I added LEMO connectors on a tektronix 1103 tekprobe power supply, so now I can use both old active tektronix probes and yokogawa probes. I feed the yokogawaprobes with 15V +/- but they seems to be ok with that.
HP 8924c GPIB control: software? - Page 1
Forum section: electronics / testgear

author: ironcurtain
author_rank: Regular Contributor
timestamp: June 05, 2024, 11:54:55 pm
content: Hi,I'm guessing people are using PyVisa and friends... but I guess a thread won't hurt. What are you (owners of HP 892x gear) using for remote/GPIB control?I'm looking for something that allows me to test/run commands, getting immediate feedback. So far with Keysight Command Expert I always get errors instead of the responses (but I can see the commands seem to execute).There is also no command set available for the 8924c, the closest is for M8924.

author: rcjoy
author_rank: Regular Contributor
timestamp: June 10, 2024, 10:23:34 am
content: Do a Google search for the HP 8924C Condensed Programming Reference GuideHere's one link:https://xdevs.com/doc/HP_Agilent_Keysight/HP%208924C%20Programmer.pdf
Siglent SDS800X HD - Debug Menu Items - Page 1
Forum section: electronics / testgear

author: TomKatt
author_rank: Frequent Contributor
timestamp: June 05, 2024, 09:12:35 pm
content: EDIT - Inadvertent modifications to any of the items in the Debug menu can render the device inoperative, and with a touchscreen that risk is much higher. There is nothing in this menu that benefits the user in any way, so I am removing my comments out of respect to Siglent support who have been helpful to me here in the forums. We've got a good thing going with the upgrade hacks and I don't want to give Siglent any reason to start locking things down more securely.

author: tautech
author_rank: Super Contributor
timestamp: June 05, 2024, 09:18:15 pm
content: Best advice to to keep out of the Debug menu.Please ......

author: TomKatt
author_rank: Frequent Contributor
timestamp: June 05, 2024, 09:20:10 pm
content: Quote from: tautech on June 05, 2024, 09:18:15 pmBelieve me - I have no intention of mucking around here. It does look a bit dangerous.I'm just a curious guy lol.I will certainly heed your advice!
Agilent 2000A / 3000A Oscilloscope NAND Recovery - Page 1
Forum section: electronics / testgear

author: EEVblog
author_rank: Unknown
timestamp: June 04, 2024, 11:32:22 pm
content: Very detailed article for those that need it:https://salvagedcircuitry.com/2000a-nand-recovery.html

author: salvagedcircuitry
author_rank: Regular Contributor
timestamp: June 06, 2024, 01:58:59 am
content: Thanks for the mention! Big thanks to Titiris, Alanme, FrankBuss, PA0PBZ, travisc, plesa, & TheSteve and many others for perfecting the "Titiris" UART recovery method.
Which tip for Metcal soldering  iron? - Page 1
Forum section: electronics / testgear

author: Faringdon
author_rank: Super Contributor
timestamp: June 05, 2024, 06:46:25 am
content: Hi,We have metcal MX-500-P and a metcal MX-500P-21 solder stations.We have the following tips for them.METCAL TIPSSTTC 038 1286 2014 (...LOOKS NICE SIZE)STTC 017 9130 2063 (....5MM SCREWDRIVER TIP)STTC 017 3125 1636 (....4MM SCREW DRIVE)STTC 136 0255 0177 (......2MM NICE BIG)STTC 138 1285 0645 (.......NOT SUPA FINE BUT GOOD)STTC 125 1281 1641 (........NICE FINE)Only the STTC 017 3125 1636 works with the MX-500P iron.(but even that doesnt work all the time)Do you know why?Do you know where is a table showing which tip for which iron?Metcal MX 500Phttps://www.farnell.com/datasheets/3971777.pdf

author: Psi
author_rank: Super Contributor
timestamp: June 05, 2024, 07:50:08 am
content: Maybe there's a bad connection in the handle or cable.Maybe, if its the handle where the tips attaches, that one tip that works could be slightly wider than the others allowing it to work sometimes.AFAIK all those tips 'should' work. But I don't have metcal I have the thermaltronics equivalent .Anything STTC and SMTC should work on MX-500

author: tggzzz
author_rank: Super Contributor
timestamp: June 05, 2024, 08:21:57 am
content: Quote from: Faringdon on June 05, 2024, 06:46:25 amYes. Something is broken.QuoteYes I do.It took me less than a minute to find the document and verify it has that information.Are you so incapable you can't use a search engine?Hint:https://duckduckgo.com/?q=tip+for+metcal+mx500p

author: 4thDoctorWhoFan
author_rank: Regular Contributor
timestamp: June 05, 2024, 11:07:15 am
content: Are the tips you mentioned new? If not, the tips might be old and worn out. The heating element is in the tips so that is most likely the failure point.Personally, I like the chisel tips. So from your list, I like the STTC 036 for 600 degrees and the 136 for 700 degrees. I do use the 700 degree tips most often.
John Fluke 301E Power Supply Manual? - Page 1
Forum section: electronics / testgear

author: The Doktor
author_rank: Regular Contributor
timestamp: February 21, 2023, 07:04:11 pm
content: I've got a John Fluke 301E Power Supply and would like to download a manual. Anyone know a source? I had one a few years back, which somehow disappeared. Nothing at BAMA, and google doesn't seem to be helpful.

author: VacuumTubeAudio
author_rank: Newbie
timestamp: May 18, 2024, 06:31:44 pm
content: Hi, are you still looking for a Fluke 301E power supply manual? I happen to have one for this very rare vintage Fluke supply, printed in 1969, that I would be happy to scan for you. But it might take me a few days until I could get to it.I was able to restore mine successfully a couple of years ago and it works great. But it took a lot of work. There are some unique components in this design like: thyrite varistors, chopper relay, mercury cell battery, and a weston cell battery, that are no longer available anywhere. But if is possible to hack some substitute parts together for these and get it working. The only problem I have with mine is the front panel meter M1 is broken and I have not been able to locate a suitable 0-1 ma, 4 1/2 “ substitute. If anyone has one please let me know.If you are up for a challenge, restoring a Fluke 301E is a good one, and well worth the effort!

author: The Doktor
author_rank: Regular Contributor
timestamp: June 05, 2024, 09:38:42 pm
content: Hi, thank you for your offer. As luck would have it, I am no longer looking for a manual. It looks like I purchased a manual in late July 2013 from a place called Manuals Plus in Maryland. According to what is written inside the manual, it covers serial number 123 and above. I found that manual by accident a few weeks ago, it was stacked on a shelf about 5 feet away from where I usually sit. Most likely since I first got it. I will be quite certain it does not get lost again, and may at some time decide to scan it and uploaded to BAMA. Searching for another one for almost a year did not prove fruitful.I think most of the more exotic components will be fairly easy to substitute. The Weston cell could easily be done with a small power supply, the sophistication of which will depend on accuracy desired. I saw somebody post a replacement for the thyrite varistors which is just two resistors and a diode, not exactly equivalent to original but should work fine. About the only component which may turn out to be a tough thing if it needs replaced is the chopper. I also suspect that the chopper will be just fine with a little bit of cleaning and lube. If not, a solid-state replacement will need to be designed. Should be too incredibly hard Unless some of the voltages get high. I know part of it is used for synchronous rectification, but not sure just how high the voltage is in that section until I start working on this thing.I think I probably am up to the challenge, question is can I get myself to start.As to the broken meter on yours,You should post on the Buy/Sell/Wanted forum, there are a lot of people on this board, one of them may be able to help.
Brymen BM869s no longer reading AC voltage - Page 1
Forum section: electronics / testgear

author: JohnBee
author_rank: Contributor
timestamp: June 03, 2024, 07:04:49 pm
content: Hi everyone, I was wondering if anyone had any tips for a recent issue that I've come across with my beloved Brymen 869s, of which, I keep in a hardshell case all of the time, and pamper quite frequently - though for some unknown reason, my meter suddenly refuses to read AC - DC, is fine, frequencies etc, but anything AC, and the meter just seems to go into a sort-of endless loop of trying to read.PS, I tried turning-off auto, and selecting fixed decimal points, but the meter won't read anything, ie, displaying residual values in 4th digit range type thing

author: J-R
author_rank: Super Contributor
timestamp: June 03, 2024, 09:11:15 pm
content: I suppose I have a few questions:What are you trying to measure? Photo of your setup?Do other AC functions work, such as mV or current?
Agilent E8357A LCD backlight died or toggled CCFL OFF ?? - Page 1
Forum section: electronics / testgear

author: EE-digger
author_rank: Frequent Contributor
timestamp: June 01, 2024, 11:39:55 pm
content: A month ago I was testing external monitors as a possible upgrade for the internal LCD. I found a nice 10" 800x600 module with VGA input that gives an absolutely stunning display. Not an MS fan but have to thank windows for nicely supporting the display options.For various reasons, I decided to stick with the internal display. The Lynx 3D video controller is fussy but can be tamed. The LCD remained dark until I realized the display was actually ON but backlight was off. Confirmed with a bright desk lamp. The Lynx hot keys work so I can toggle external VGA, LCD or both.Does anyone know of control bits for the backlight that may have been accidentally toggled. I had NO display problems before my external tests. I can't believe it randomly died exactly when I needed to use it again ... after a few weeks of laying idle.I've been through the programming guide but found nothing backlight related.

author: tautech
author_rank: Super Contributor
timestamp: June 02, 2024, 03:43:50 am
content: Quote from: EE-digger on June 01, 2024, 11:39:55 pmYeah that seems strange but random things do happen.Maybe check there is some inverter activity in the backlight circuitry.These things are normally noisy so a near field probe might be good enough.

author: EE-digger
author_rank: Frequent Contributor
timestamp: June 03, 2024, 02:42:51 am
content: I found a tech bulletin on a commonly failing fuse on the inverter PCB in this series. It was covered for replacement for years but that ended. I'll be checking that first.

author: EE-digger
author_rank: Frequent Contributor
timestamp: June 03, 2024, 03:29:08 pm
content: For future reference, it was just the fuse on the inverter board. It's a 2A SMT, possibly 0805. Our Agilent guru, CV, seems to recall that it should have been 3A or 4A, the latter of which I happened to have on hand.We have glitchy power outages from fallen trees around here and when the interrupter cuts power to the neighborhood, it's BANG, BANG, BANG. Not surprised there may be some power up surges.
Metrix ox8620 / ox8627 - Page 1
Forum section: electronics / testgear

author: stj
author_rank: Super Contributor
timestamp: May 19, 2024, 11:55:29 am
content: looking for a user manual and/or service manual if anybody has one.OR info on the part of the circuit related to the Z input,and how to get the scope to use x10 probes - because i cant find that menu!and any eprom dumps newer than 1.0 would be goodif anybody needs them - i dumped the 1.0 romsi know people have had problems fixing these scopes before,so i'll say some stuff - having fixed one.you have to completely strip the unit to remove the baseboard and to do so you must desolder multiple earth wires from the tube, one on the psu heatsink, 2 on the digital card and 2 wires for trace-rotation on the ront-panelthen FULLY recap the baseboard because the original caps are mostly Marcon crap and they do leak and go high-impedence.dont overlook the ones under the frontend shielding.i used Panasonic FR for the low violtage and EE for the high voltage onesalso there is a bodged in RIFA soldered under the board across the switching transformer.you may need to strip the power switch and lube it internally - because good luck finding a new one.you need to strip the front panel and spray contact-cleaner into the pots and strip/clean the 3 rotary switch contacts/tracksthe pots are terrible and the switches fill with carbon/graphite dustfinally, lose the lithium battery from the digital card - i dont care that it's still 3v - it's 28years old and ready to blow!it's a nice scope once you do all that btw!

author: stj
author_rank: Super Contributor
timestamp: June 03, 2024, 03:07:15 pm
content: a few bits
Reverse engineering and repair of LeCroy HFP2500 probe - Page 1
Forum section: electronics / testgear

author: dmderev
author_rank: Contributor
timestamp: June 01, 2024, 11:13:35 pm
content: This project started when I received the allegedly not functional HFP2500 probe. It was specified as 2500MHz, 100kOhm input probe with 0.7pF capacitance. When plugged into oscilloscope, it was properly recognized, but was showing only some signal at frequencies above 1GHz, and no DC or low frequency signals. I was a bit upset as I identified that the probe head is not working and I will have to find some rare RF FETs or other exotic components. I disassembled the probe head and found there the following .... The rest is in the PDF description.<...>I assembled the probe, and as before, there was no input signal… So what was wrong? The problem was in the receptacle from probe pin – as the probe can be easily disassembled and falls apart, someone put glue on contacting surfaces, and the pin did not get connected with probe amplifier. What a pity – spending all that time to not notice that trivial mistake? TV troubleshooting guide suggests that when TV does not work, it makes sense to check if it is plugged in power outlet. My case was very similar! Fix with scratching it out with exacto knife fixed the problem.The final check of frequency response has shown ~1.8GHz flat frequency response within 3dB, and a 5dB peak at 2.8GHz. That may be the instrumentation/ground inductance problem.However, since the work was done, someone curious may find this information helpful… My findings:= It is not necessary to use FETs in high frequency probes, high quality but cheap RF transistors (especially SiGe) may give the probe bandwidths in excess of 2GHz. The impedance at high end is determined by capacitance anyway.= Using varactors as lower leg of capacitive divider is OK especially when the signal voltage is lower than 1V. This will usually be the case in composite, dual path architectures= LeCroy was not pushing design to the limit, having bipolar transistors in the probe makes it virtually un-destructible= They did not connect common ground of power supply to shield of coax and t the probe. The connection happens when the probe is plugged, but it may creates stresses when probe is being plugged or used standalone. I added this connection, but IMHO, it is a design defect.= They put a decent coaxial cable and 7 more power and signal wires in a 4mm rather flexible probe cable… I wish I could source it too. Anyone knows?

author: dmderev
author_rank: Contributor
timestamp: June 01, 2024, 11:14:59 pm
content: The main document did not get through. So trying to re-attach here...

author: dmderev
author_rank: Contributor
timestamp: June 01, 2024, 11:23:09 pm
content: Pictures, too...

author: DaJMasta
author_rank: Super Contributor
timestamp: June 02, 2024, 02:22:21 am
content: For such an expensive probe I'm impressed they got away with such a front end! No exotic materials, substrates, or custom parts - I wonder if this could inform a nice little DIY design.
Fnirsi DPOX180H and Hantek T3100 100MHz Oscilloscope Probe X100 Passive Probe - Page 1
Forum section: electronics / testgear

author: tpd
author_rank: Contributor
timestamp: June 01, 2024, 02:25:20 pm
content: Hi, I Fnirsi's manual have found that x100 or evem x1000 probe should be used for high-voltage measurements:"The bandwidth of the 1X probe gear of the accessory probe is 5MHz, and the bandwidth of the 10X probe gear is 200MHz. When measuring a frequency higher than 5MHz, you need to switch the probe to the 10X gear, and the oscilloscope should also be set to the 10X gear. Otherwise the signal will be greatly attenuated, as is the case with all oscilloscopes. Because the probe line of the oscilloscope itself has a capacitance as high as 100~300pF, which is a large capacitance for high-frequency signals! The signal has been greatly attenuated when it reaches the input end of the oscilloscope through the probe, and the equivalent bandwidth is 5MHz. Therefore, in order to match the hundreds of pF of the probe line, the input end of the probe line is first attenuated by 10 times (the switch is at 10X), so that hundreds of pF capacitors are just used for impedance matching.At this time, the bandwidth is 200MHz. Note that only probes with a bandwidth of 200MHz or above can be used."Since Hantek's probe is for 100 MHz, can it be used with Fnirsi?Thanks
EastTester ET4410 LCR meter new Kelvin probes - Page 1
Forum section: electronics / testgear

author: gaminn
author_rank: Frequent Contributor
timestamp: June 05, 2024, 01:49:54 pm
content: Hi, I recently purchased ET4410 LCR meter and I'm happy with it but I need longer test probe (the supplied one has approx 70 cm only). It would also be nice to have SMD Kelvin probe for this LCR meter. I found this listing on AliExpresshttps://www.aliexpress.com/item/1005004873453343.htmlwhich has both alligator and SMD clips, 1 meter long (which should be enough, but 1.2 m would be optimal), with "junction box" to be able co quickly change the probe. Any idea if it will be compatible with ET4410 (BNC center to center distance)? I can see ET4410 has a reverse order of the BNCs compared to the probes (Hcur Hpot Lpot Lcur compared to Lcur Lpot Hpot Hcur), but that should be no problem, in the worst case I will relabel the polarity of the alligators/SMD clip.Or is there a better option where to buy Kelvin probes for ET4410 for reasonable price?

author: mawyatt
author_rank: Super Contributor
timestamp: June 05, 2024, 04:08:56 pm
content: We've spent a lot of time and $ wrt SMD device for accurate repeatable results. Bottom line is forget the tweezers and Kelvin Clips for SMD devices. See below and all our related posts.https://www.eevblog.com/forum/testgear/cheap-smd-lcr-fixture-the-good-bad-and-ugly!/As you can see you'll need to modify the fixtures for best results, and the longer the cables the more uncertainty in the measurements, so keep the cables as short as possible.Please follow all our related posts for these fixtures, including the DC Bias fixture which allows adding DC bias to the DUT and see how this affects the DUT parametersGood luck with your new LCR meterBest,

author: gaminn
author_rank: Frequent Contributor
timestamp: June 05, 2024, 04:31:32 pm
content: Thanks. Regarding the fixture, is the BNC center to center distance 22mm?

author: mawyatt
author_rank: Super Contributor
timestamp: June 05, 2024, 04:37:42 pm
content: Yes, standard BNC spacing on our TH2830 and IM3536 LCR meters.Best,
New LCR meter, JyeTech M181, SMD DIY kit (May 2024) - Page 1
Forum section: electronics / testgear

author: tunk
author_rank: Super Contributor
timestamp: May 27, 2024, 01:35:38 pm
content: - Resistance range: 0.1ohm — 10M ohm- Capacitance range: 1pF — 10000uF- Inductance range: 1uH — 20H- Fully automatic ranging- Accuracy: about 1%- Measurement frequency: 1KHz/100Hz selectable- Measurement voltage: 0.6Vpp- edit may 28th: size 66x32x19mmMore info, including manual, assembly guide and schematics:https://jyetech.com/m181-lcr-meter/A few videos:https://www.youtube.com/@JyetechVideo/videos

author: tunk
author_rank: Super Contributor
timestamp: May 31, 2024, 12:44:43 pm
content: Starting to show up online for US$33:https://accudiy.com/collections/meters/products/m181-lcr-meter-diy-kit
Tektronics TDS754C schematic - Page 1
Forum section: electronics / testgear

author: carlton_mick
author_rank: Newbie
timestamp: May 22, 2024, 10:05:29 pm
content: HiHave a TDS754C with faults, wont boot and know it has faults on the video memory. really need schematics to trace faults on the processor pcb. anybody able to help?

author: vaualbus
author_rank: Frequent Contributor
timestamp: May 23, 2024, 10:27:55 am
content: No schematics has ever been released to any TDS scope apart from TDS520/544/644 and 544B.Good luck, if they will never publish them, it would be like find gold.

author: carlton_mick
author_rank: Newbie
timestamp: May 25, 2024, 12:03:27 am
content: Vaualbus. Thanks for the info. I am sure many elements will be similar so will search out those you list. I have some problems with dsp memory and info on the I10412-01 daculator.

author: cedinu
author_rank: Newbie
timestamp: May 25, 2024, 06:47:50 am
content: IMP I10412 is 16 DACs 12bit. No datasheet AFAIK. You can see the pinout in 1740A WFM service manual.

author: nctnico
author_rank: Super Contributor
timestamp: May 25, 2024, 10:51:58 am
content: Quote from: carlton_mick on May 25, 2024, 12:03:27 amYour assumption is correct. You can use the schematics for other oscilloscopes from the same series (start by looking for 'TDS520B component level service manual') to figure out what the problem is. Over time there have been some optimisations but the basic designs are the same. There are quite a few ASICs in these oscilloscopes which would make it hard to make radical changes without needing to do a costly re-design of the ASICs.

author: vaualbus
author_rank: Frequent Contributor
timestamp: May 31, 2024, 09:38:22 am
content: But the CPU board is completely different on C/D models, they switched to a 68040 CPU so probably the schematics are not correct at all.Even between 540 and 540A the CPU was redesigned.I think A and B model CPU are the same maybe?A.V
MSO2000 DPO2000 application module hack - Page 1
Forum section: electronics / testgear

author: volvo_nut_v70
author_rank: Regular Contributor
timestamp: July 10, 2019, 04:05:19 pm
content: This is just a summary of the existing threads herehttps://www.eevblog.com/forum/testgear/mso2000-application-module-hack/. The two methods are re programming/creating a TDS module. The second is applying a patched firmware to the scope. I have tried the firmware and it works, the module rewrite works with the TDS3000 series (uses a 24C02)https://www.eevblog.com/forum/projects/tektronix-tds3000-oscilloscope-modules-tds3uam/msg581285/#msg581285, didn't verify this one.Requires host TDS3 module + 24C08 (to replace the 24C02)http://web.archive.org/web/20140729081735/https://sites.google.com/site/blinkyoontz/hacktekFirmware hackhttps://github.com/dmitrodem/tek_softhack​Torrent links to patched V1.56 firmware (which is the latest)https://www.nmsbt.com/nms/TEK/1-2-1-1.htmlhttps://translate.google.com/translate?hl=en&sl=zh-CN&u=http://btdiggcn.org/0zsU-uxNllB1GGnJEDrI5krGH-A.html&prev=search

author: darkstar49
author_rank: Frequent Contributor
timestamp: July 10, 2019, 04:14:56 pm
content: why the heck would anyone create new TDS modulesBuy some cheap TDS3FFT or TDS3TRG modules (which are useless anyway, as those options are activated by default in the TDS3K FW since an eternity), and reprogram those... done this a 1000x times !!!

author: darkstar49
author_rank: Frequent Contributor
timestamp: July 10, 2019, 04:20:43 pm
content: BTW, modules work for TDS3K, DPO2K, DPO3K (not for BW upgrades, but keygen available) and DPO4K.For MDO's, there's a keygen (in this forum, didn't search...) for the MDO3K, and some work has been done for MDO4K's as well, but you'd have to check the related thread (don't remember if it's just the key that changes, or if the algo is slightly different...).

author: blackfin76
author_rank: Regular Contributor
timestamp: November 11, 2022, 11:00:20 am
content: Firmware hack works like advertised, you get four application modules instead of just two with the hardware modules.Now I no longer need to switch hardware modules to change to another serial bus decoder.

author: [steven]
author_rank: Contributor
timestamp: May 30, 2024, 10:41:15 pm
content: Does anyone still have the patched firmware? The link in the first post seems to be offline and I'm also having issues compiling my own firmware.
Flir cm275 or fluke 279Fc - Page 1
Forum section: electronics / testgear

author: Демян
author_rank: Newbie
timestamp: May 30, 2024, 09:24:31 am
content: HiI want to buy new multimeter with IR camera. I'm thinking about fluke 279fc or flir cm275. Flir is clamp meter and it have better camera, but fluke is better as normal meter and I have never worked with flir multimeters.I have possibility to buy both of this meter at the same price ( 750$). Is it worth to try it?Thanks for replyBest regardsDamian

author: BeBuLamar
author_rank: Super Contributor
timestamp: May 30, 2024, 10:46:14 am
content: I have never used the FLIR but I have used the Fluke. I don't like it at all. Fix focus, low resolution and the worse part is that the battery is always dead when I want to use it. I wouldn't buy a thermo imager that has some form of DMM function built in.

author: J-R
author_rank: Super Contributor
timestamp: May 30, 2024, 10:16:42 pm
content: Closest I have is the Flir DM166 and my thought is that you're really better off with separate devices for a couple reasons. First is that the battery life is very short due to having to run the color display, even for just DMM functions. Second is that combo devices are frequently poor at their individual functions and both the Fluke and Flir appear to follow this trend.Why not get a Flir IR camera that attaches to your cell phone then a nice DMM?
Heathkit IG-102 RF signal Generator Restoration - Page 1
Forum section: electronics / testgear

author: jcrubin
author_rank: Frequent Contributor
timestamp: February 26, 2017, 07:15:48 pm
content: This thread chronicles the restoration of my IG-102

author: TimFox
author_rank: Super Contributor
timestamp: February 27, 2017, 05:09:10 pm
content: Your photo is of an IT-11 or IT-28 capacitor checker, not the IG-102 signal generator.

author: edpalmer42
author_rank: Super Contributor
timestamp: February 27, 2017, 06:08:42 pm
content: Watch the video.He uses the capacitor checker to check a couple of capcitors in the RF generator.

author: jcrubin
author_rank: Frequent Contributor
timestamp: February 28, 2017, 02:59:36 am
content: I will applaud your astuteness. Most people would have missed that. However youtube gives you 3 crappy photos at random when you upload a movie, not having time to make a custom one yet, I choose the one that wasn't my hand and the one that wasn't the oscilloscope.

author: Radio Tech
author_rank: Frequent Contributor
timestamp: March 06, 2017, 02:06:28 pm
content: Will watch the series tonight, thanks for sharing.

author: W3KW
author_rank: Contributor
timestamp: May 28, 2024, 02:14:33 pm
content: I'm currently restoring three 102's. Two are of the "S" variety. They have a pre-attenuator sample port on the front. If you look at the back of any -102, you will see two holes in the sub-chassis where the probe banana jacks are mounted. It's not difficult to add them to any -102. There is no cathode follower or buffer for the change. It will drag your frequency a bit, but you'll be using a frequency counter anyway when using the generator, so it doesn't really matter.One of my 102's had an intermittent issue. It had no output unless I put side pressure on the main tuning capacitor knob. Clearly there was a bad solder joint, but visual inspection could not find it. I reheated every joint near the capacitor and bam, back to life and good as new. Whomever calibrated this one did an amazing job. It's super close at 455 and many other local haunts. Sweet.So far, all the tubes are Mullard. Nice! I looked into buying a 12AT7. Gulp. Unreal expensive. Audiophiles are driving up all the prices?

author: jcrubin
author_rank: Frequent Contributor
timestamp: May 30, 2024, 08:39:00 pm
content: Ebay drives up the prices for reasons unknown to me.
Wiring of Keithley trigger link cable 8501-1 - Page 1
Forum section: electronics / testgear

author: voltsandjolts
author_rank: Unknown
timestamp: May 30, 2024, 07:53:23 am
content: I don't want to pay£130for a 8-pin mini din male-male cable.Can anyone confirm if this keithley cable is straight through wiring?The datasheet implies that it is, as shown on second page.Just want to be really really sure before plugging in.
JUNTEK JDS6600 - Page 1
Forum section: electronics / testgear

author: snickers
author_rank: Contributor
timestamp: December 07, 2023, 09:13:23 am
content: Hello everybody.Does anybody know, how to enter service menu in this generator/counter to fine tune the internal reference?I need to set it to zero.

author: coromonadalix
author_rank: Super Contributor
timestamp: December 07, 2023, 01:23:15 pm
content: not even sure there is one ??where do you take this information ? here ?https://www.eevblog.com/forum/testgear/anybody-know-anything-about-this-signal-generator/

author: snickers
author_rank: Contributor
timestamp: December 07, 2023, 02:46:18 pm
content: yes, this one.Beacuse all same chiniese models have that abbility in hidden menu to fine tune internal oscillator correction.

author: Aldo22
author_rank: Super Contributor
timestamp: December 07, 2023, 03:34:07 pm
content: I only know this for the Feeltech fy3200, but that's a different model.https://www.eevblog.com/forum/testgear/feeltech-fy3224s-24mhz-2-channel-dds-aw-function-signal-generator/?action=dlattach;attach=1600705

author: snickers
author_rank: Contributor
timestamp: December 07, 2023, 03:43:21 pm
content: I know it ...But on JDS6600 model this magic combination do not work.And it is the aim of my question. I'm sure that this model also have such one and i bielive that somebody knows it ...

author: Aldo22
author_rank: Super Contributor
timestamp: December 07, 2023, 03:55:35 pm
content: I would ask the manufacturer Hangzhou Junce Instruments Co., Ltd.http://www.junteks.com/lxwm

author: cinealfa
author_rank: Newbie
timestamp: May 30, 2024, 06:43:20 am
content: Did you ever figure it out, Snickers?
Tektronix CSA 7404 SPC hang? - Page 1
Forum section: electronics / testgear

author: danielg30
author_rank: Newbie
timestamp: May 29, 2024, 07:23:20 am
content: Hi All,Newbie here, just got a Tektronix CSA 7404 from ebay. Machine boots and runs, and even passes self tests. However, when I go to run SPC, it never finishes. Left it for an hour (despite saying should take 7 minutes), screens shows its performing a long operation, that never terminates. After rebooting and warmed up, SPC changes to fail. Is there any logs I can pull or other procedures?Thanks,Daniel

author: coromonadalix
author_rank: Super Contributor
timestamp: May 29, 2024, 10:04:05 am
content: spc can take longer than 7 mins for sure, around 15-20 mins on a 7404do you have errors codes in the tek software ? and as you may know, the spc is run without any probes ...i had an dallas battery dead, and reconfigure the power pc VX WORK boot script (no tek SW would load, simply hang)an eeprom error who created an error code who made the spc failyou have an huge tds7k thread here and i posted a few times, and other have too

author: danielg30
author_rank: Newbie
timestamp: May 30, 2024, 04:05:31 am
content: I left it for about an hour, it never finishes. Ran without probes. No error codes that I could see in self test (Instrument Diagnostics). Can you specific where I should check?Thanks,Daniel
How good is the SV4401A or SV6301A handheld VNA? - Page 1
Forum section: electronics / testgear

author: szoftveres
author_rank: Regular Contributor
timestamp: May 27, 2024, 06:56:05 pm
content: I'm on the market for a cheap VNA with adjustable output power level down to at least -30dBm and interested in any bad experience with either of these VNAs - there's a groups.io thread about some battery related start-up issues and PC connection related problems, wondering if there are any more gotchas.(RF/Microwave topic might be more successful in terms of getting responses for this question, but heck, let's stick to the rules)

author: KeBeNe
author_rank: Regular Contributor
timestamp: May 30, 2024, 12:06:58 am
content: Hi,I have an SV4401A, it has no problems with the battery, the software connection also works, but I rarely use the software.I am delighted with the device, up to 3Ghz very good, above that with less dynamic range.So here the device runs very stable, for the price (at that time) about 330€ with shipping fully in order.
Test equipment rental service recommendation request - USA - Page 1
Forum section: electronics / testgear

author: AJbotic
author_rank: Newbie
timestamp: May 28, 2024, 08:18:09 pm
content: Hello colleagues,I'm looking to rent a ~2.5kW DC electronic load for a few weeks until I have time to design a rudimentary one of my own for the bench. Does anyone have any equipment rental services they use in the US which they'd recommend? I've stumbled across Electro Rent (where I've submitted some quote requests), but having trouble finding rental vs buy options at the other google hits. Thanks in advance.-AJ
Tektronix TDS5000 Thermal Printer - Page 1
Forum section: electronics / testgear

author: Jamieson
author_rank: Regular Contributor
timestamp: May 06, 2024, 05:15:44 pm
content: I'll soon be owner of a Tek TDS5000 oscilloscope with the built in thermal printer. I've been using TDS5000 series scopes for many years but never encountered one with the built in printer option.Does anyone know what size paper this thing takes? 110mm?I believe the printer is Tek part number 655-4920-xx and a single roll of paper is Tek 016-1897-xx, not much more info available on these.

author: colorburst
author_rank: Regular Contributor
timestamp: May 07, 2024, 05:13:38 pm
content: Yes, the printer takes 110mm paper. Mine came with a 40mm OD roll, but 50mm might just barely fit.

author: Jamieson
author_rank: Regular Contributor
timestamp: May 13, 2024, 12:10:52 pm
content: Thanks for the info. I've got a few paper rolls on order and will test it out this week.If it works I'll likely remove it and offer it for sale. Perhaps there are some TDS5000(B) owners out there who would be interested.

author: pascal_sweden
author_rank: Super Contributor
timestamp: May 13, 2024, 01:38:59 pm
content: Can you make a full picture of the oscilloscope to get a better impression where the thermal printer is located in the oscilloscope?

author: colorburst
author_rank: Regular Contributor
timestamp: May 13, 2024, 02:12:28 pm
content: It's on the top, see attached.

author: coromonadalix
author_rank: Super Contributor
timestamp: May 13, 2024, 04:35:04 pm
content: normally the roller is the giveaway for the paper width ...

author: Jamieson
author_rank: Regular Contributor
timestamp: May 14, 2024, 11:42:50 am
content: 110mm width is kind of unusual, not usually something office supply stores keep in stock in the US.I've ordered these thermal paper rolls, 110mm wide, 7m length, 30mm OD.https://www.amazon.com/dp/B0BTPNFVRQ?ref=ppx_yo2ov_dt_b_product_details&th=1TDS5000 scopes without the printer option have a hinged door and small storage compartment on top. Maybe a probe or two could be jammed in there.

author: Jamieson
author_rank: Regular Contributor
timestamp: May 20, 2024, 02:49:56 am
content: The cheap 110mm paper rolls I found on Amazon work just fine with this printer.

author: Jamieson
author_rank: Regular Contributor
timestamp: May 28, 2024, 03:17:04 pm
content: This printer is listed for sale:https://www.ebay.com/itm/186459172960