hybridfree/eevblog-posts huggingface dataset:
Looking for a 32 Channel Logic Analyzer - Page 1
Forum section: electronics / testgear

author: smbaker
author_rank: Regular Contributor
timestamp: May 23, 2022, 03:37:32 am
content: I do a lot of vintage computer diagnostics, and while I currently have a cheap 16-channel logic analyzer knock-off, it seems like 16 channel is just never enough. 24 channels would probably suffice, but 32 channels would be even nicer. Feature I need are:1) 5V TTL tolerant, as I primarily work with 5V vintage computers.2) 24 channels minimum, 32 channels ideal.3) At least good enough to do a ~ 20 MHz CPU.4) USB-based with decent software so I can capture a log of the logic transitions and post-process them.I'm currently looking at the Digilent Digital Discovery. Do folks here have some experiences with this, including the quality of the software that goes along with it? Is there anything else I should be looking at?Thanks,Scott

author: jeremy
author_rank: Super Contributor
timestamp: May 23, 2022, 12:24:55 pm
content: Alsohttp://sigrok.org/wiki/Hantek_4032LI have the digital discovery; it does what it says. Waveforms is pretty good, especially given that it is free.

author: zzattack
author_rank: Regular Contributor
timestamp: May 23, 2022, 12:35:52 pm
content: Self-plug, but seems to fit the bill:https://www.eevblog.com/forum/buysellwanted/fs-(eunl)-intronix-logicport/

author: nfmax
author_rank: Super Contributor
timestamp: May 23, 2022, 01:36:41 pm
content: I second the Intronix. It has a proper state capture mode with real hardware clock qualifier inputs, great for 8-bit micros. It's biggest drawback is the limited memory
Recondition IGBT test approach - Page 1
Forum section: electronics / testgear

author: ow19m
author_rank: Contributor
timestamp: May 29, 2022, 05:56:51 am
content: Hello to all ,I need 4 single IGBT's modules for testing purposes which could possibly blow during tests and trials , so without taking risks , Im getting my self some recondition IGBT modules that look absolutely fine and are a bit cheap , I was wondering if someone could advice me ways to test the performance and life expectancy of these IGBT's (for knowledge purposes) or stress analysis is my only option ? by the way its aFZ800R12KE3Infinion module.Thanks ,

author: Martin72
author_rank: Super Contributor
timestamp: May 29, 2022, 09:20:20 pm
content: Hi,On the first thoughts I would test some of the points from the datasheet.Like on/off time, leakage current and "breakdown" voltage, close as possible.We´re manufacturing power inverter/converter which running thousands of working hours and we´re servicing them also.My experiences with used IGBTs are more or less "digital" - Either they work or don´t.Most defectives are short circuit between C-E, followed by dead gates (rare).When I´m testing IGBTs I use a circuit I´ve created for building a static switch for (resistive) loadsteps, see pic below - much better than simply using a multimeter.Of course you could use simply a generator directly connected (via gate resistor) to the IGBT.But I won´t trust the output of the gen because of the gate-capacitance of the IGBT.Plus you won´t have a galvanic isolation when supplying the IGBT with higher voltage.Breakdown voltage I would test with an isolation megger, when no dedicated high voltage supply is avaible.Martin
Dynamco oscilloscope - general/7202 timebase information wanted. - Page 1
Forum section: electronics / testgear

author: Dr Wobble
author_rank: Contributor
timestamp: April 25, 2016, 02:39:37 pm
content: I have a vintage Dynamco oscillscope which is in a bit of a state. It's missing an IC and a few transistors- see pic. In order to be able to get it fully working (it has a trace,so the CRT is ok ) I'm trying to find a schematic at the very least of the timebase section 7202. If not, if any one has one of these scopes, a picture of the PCB would be of great help.The scope is well made and made up of three "modules". These come apart, making servicing easy, neat eh?. Firstly there's a 7212 Y amplifier module, a 7200 display module and thirdly the 7202 timebase module. I've managed to find info on the first two, but despite intensive searching, can't find anything on the 7202. This had a delayed sweep function.These scopes were used by The Post Office in the UK, now BT (British Telecom), this one has a plate on the back indicating this was used by the PO. A date is written on the EHT PSU saying made 22 Sept 1976 or 8. All I glean about Dynamco LTD who made these scopes and the voltmeter Dave recently tore down, is that a team from Solartron left to form Dynamco, which was later bought be Sclumberger. Any info on Dynamco LTD would be most appreciated.Searching is made difficult because there is a modern company in the States who makes Neumatic valves, and there's a few other companies of the same name, one of which is a Scientific company in the UK, who I've also contacted for info.TFL, Andy.Will post pics later, unable to loa

author: Chris56000
author_rank: Frequent Contributor
timestamp: October 16, 2020, 05:01:17 pm
content: Hi!These Dynamco 7200 (called "72 Series") are even rarer than the 71 series and in 4 years I have only come across two examples – one being the incomplete example shown above by the OP, which I subsequently bought with the OP's agreement, and a second (hopefully complete internally!) example I won a couple of weeks ago for a very appealing price on the evil bay!Anyway with the aid of the recently acquired example and the Dynamco 71 and 72 handbooks I do have, I will start work on a new book for the 7202 over the next few months, and post it here and on k04BB when completed!The book will be produced in Dynamco format in similar style to the original and will be complete!Chris Williams

author: MikeOfDukes
author_rank: Newbie
timestamp: May 05, 2022, 09:02:45 am
content: I have a working Dynamco 72 series scope with 7202 delay trigger timebase.I also have the four Technical handbooks for this kit.

author: Chris56000
author_rank: Frequent Contributor
timestamp: May 22, 2022, 03:58:04 pm
content: Hi!A copy of the '7202 Delay TB book would save me innumerable hours of painstaking and difficult work–PM sent!Chris Williams
Oscilloscope TDS5054B - Is it possible to convert to 1 GHz bandwidth ? - Page 1
Forum section: electronics / testgear

author: max-bit
author_rank: Frequent Contributor
timestamp: May 23, 2022, 11:23:55 am
content: Simple question as in the title:Oscilloscope TDS5054B - Is it possible to convert to 1 GHz bandwidth ?

author: Jwalling
author_rank: Unknown
timestamp: May 23, 2022, 06:57:39 pm
content: No. They use a different acquisition board for the 5104X.
Identifying Hantek Scope Probes - Page 1
Forum section: electronics / testgear

author: PP3331
author_rank: Contributor
timestamp: May 20, 2022, 09:22:14 pm
content: I have a number of Hantek probes sitting here, but as far as I can tell they have no identifying markings (they did come with Hantek scopes, however) so I can't tell which is which. Is there any way to tell them apart without actually trying to measure their bandwidth in use? Thanks.

author: Jasonsbx
author_rank: Newbie
timestamp: May 22, 2022, 05:35:05 am
content: If they are black and unlabeled they maybe PP80, 60meg maybe 80.
ADVANTEST R3753 series service manual - Page 1
Forum section: electronics / testgear

author: mrf245
author_rank: Regular Contributor
timestamp: February 04, 2015, 08:33:18 am
content: Hello,I have bought ADVANTEST R3753A network analyzer and maybe it has some issue in RF unit.I can just found operation manual and nothing about repair.If anyone has service manual or other document about reapir would like share to me,I will so appreciated.Thinks

author: HalfSpace
author_rank: Regular Contributor
timestamp: February 04, 2015, 08:54:58 pm
content: Hi mrf245,I don’t think ADVANTEST have service manuals for their network analyzers, they call them maintenance manuals with have no schematics or technical descriptions only calibration and maybe an error code listing to tell you which module/PCB to replace!I have fixed some of their network analyzers so give us some more details of the fault I may be able to help.HalfSpace

author: ARF
author_rank: Regular Contributor
timestamp: May 21, 2022, 08:49:08 pm
content: I will update the topic.I received such a network analyzer and planned to use it instead of my R3754A.I don't have much experience with such devices, but it seems to me that the 3753 does not work properly.I had to repair the display and replace the capacitors (almost all 33uF25V degraded), but this did not change the operation of the analyzer.I turned on the analyzer, connected it with wires:Output 2 and input ROutput 2 and input Ar3753_connection.pngI see on the screen from time to time flashing the inscription "Rch Overload"adv1.jpgI figured out that the problem is with the transmitter.You can notice spikes on the waveform, which is why I see the overload message.adv2.jpgadv5.jpgIf I do not set the full range (5Hz-500MHz), but with 1MHz, then the problem goes away.adv3.jpgThe problem does not appear in the low frequency range of 5 Hz - 999.999 kHzadv4.jpgI found out that this is a problem of switching from 999.9999KHz to 1MHzadv6.jpgadv7.jpgI don't have any ideas yet.Does anyone have such a device?
HP 4192A strange behaviour - Page 1
Forum section: electronics / testgear

author: Nevada
author_rank: Contributor
timestamp: May 22, 2022, 12:35:14 pm
content: Hi,I'm facing with a HP 4192A which has a strange issue: it displays constantly UCL in the 5kHz - 25kHz frequency range when I try to measure small values, and also cannot performs short circuit compensation in this range.It passes the self tests.Any suggestion?
MSO5000 calibration hangs at 3% - Page 1
Forum section: electronics / testgear

author: meener777
author_rank: Newbie
timestamp: May 16, 2022, 03:10:00 am
content: I have an MSO 5074 just five months old and very lightly used back in early 2022 for (successfully!) debugging a broken ESQ-1 digital synthesizer from the '80s that I restored. Pulled it out for some digital tracing on another synth project this weekend and it isn't getting signal on the display. I tried reflashing the firmware to latest official RIGOL, and Utility>System>Self Cal>Start (all cables disconnected). It consistently hangs at 3% calibration and will not progress past that. Ive also "hard" reset it using the "single" button on boot method. No dice. I am not an EE just a synth nerd who has had some luck learning my way around circuits a bit so it could very well be something really dumb.Any help or advice would be most appreciated!

author: perdrix
author_rank: Frequent Contributor
timestamp: May 16, 2022, 09:23:00 am
content: If it's truly only five months old - claim on the warranty.D.

author: Fungus
author_rank: Super Contributor
timestamp: May 16, 2022, 08:01:04 pm
content: Getting stuck on self-cal is usually a sign that one of the input channels has failed.

author: meener777
author_rank: Newbie
timestamp: May 17, 2022, 11:01:02 am
content: Sending it off for warranty repair, let you all know how it goes. So far supports was responsive, no nonsense.

author: meener777
author_rank: Newbie
timestamp: May 20, 2022, 07:01:10 pm
content: Heads up my unit arrived at RIGOL's facility in Portland yesterday and they have already completed diagnosis and are sending me a new unit. My experience with their tech support has been A+, so nice to just have absolutely zero nonsense and super fast responsive support.
Tektronix logic analyzer TLA7AA4 P6880 - Page 1
Forum section: electronics / testgear

author: dmderev
author_rank: Contributor
timestamp: May 21, 2022, 08:22:45 am
content: I would like to use P6880 probes - their active amplifier hybrids look the same as P6860 externally and have same footprint. Does anyone know if these hybrids can be set to differential mode on P6860? Or they are hardwired to differential mode? I also looked into "way pods" which connect two ribbon coaxial cables from the probe hybrids to a single ribbon wire to LA. Are the probe heads for P6860 and P6880 identical?

author: nctnico
author_rank: Super Contributor
timestamp: May 21, 2022, 10:56:41 am
content: Quote from: dmderev on May 21, 2022, 08:22:45 amI think the circuitry on the hybrids is different. My guess is that Tektronix designed the connector part identical so you can use the same footprint on your PCB.
Fluke 8060A DMM DC Parasitic Leakage Current - Page 1
Forum section: electronics / testgear

author: RF-Engineer
author_rank: Contributor
timestamp: May 20, 2022, 01:09:19 am
content: The Fluke 8060A is my all-time favorite DMM. Among several reasons, I like to manually range my DMMs without having them hunt to an appropriate range.Over the last few years, 9V battery replacement has been needed way too often. The 8060A can be sitting on the shelf in the off position for weeks at a time but when I grab it for measurement, it nearly always shows a low battery voltage indication. My thought was that a parasitic leakage current was occurring somewhere to prematurely drain the battery.In reviewing the schematic, only one component is always across the battery and it's a 0.01uF 50V X7R ceramic disc cap. The cap is used to assist with transient reduction when a DC wall-cube is used for DMM powering. I never use a wall cube with my 8060A so I extracted the cap and didn't replace it. Given the age of the 8060A, the cap was likely manufactured in the late 1980s. But so far, so good: a new battery has lasted for several months.White papers describing capacitor insulation resistance make it seem like small X7R cap sizes should have a near infinite DC resistance, even with aging. So, is it likely that it's a bad component from the initial manufacturing processes, or something age related?Paul

author: daisizhou
author_rank: Super Contributor
timestamp: May 20, 2022, 11:54:41 am
content: I am also using fluke 8060a which ceramic capacitor are you referring to? Are there any pictures?

author: Kleinstein
author_rank: Super Contributor
timestamp: May 20, 2022, 12:18:20 pm
content: MLCC, especially the SMD versions are somewhat susceptible to mechanical damage, e.g. from flexing the board. With a mechanical crack there can than be additional leakage or even a short.The THT parts are usually quite reliable, inless really stressed.

author: RF-Engineer
author_rank: Contributor
timestamp: May 20, 2022, 06:54:34 pm
content: Quote from: daisizhou on May 20, 2022, 11:54:41 amIt's C37, located on the PCB near the 9V battery compartment.Paul
RFTGm-II-Rb (KS-24019) GPS disciplining question - Page 1
Forum section: electronics / testgear

author: tymm
author_rank: Contributor
timestamp: May 20, 2022, 04:14:56 pm
content: Hi,I've got one of the Lucent RFTGm-II-Rb oscillators that I've used on and off for the past 10 years, without the matching XO unit and have just started to sort through getting it listening to a GPS unit (using an Oncore w/v2.2 firmware a number of years ago). I'm attempting to connect the Oncore externally through J5 rather than mounting it internally, but from my understanding there should be little difference as the connectors are directly connected internally. My GPS unit is running without a battery, so there wouldn't be any stored configuration to confuse things.Possibly related, but I have Rev 1 of the hardware, with an Efratom rubidium unit, so guessing firmware may be older than other units.Documentation I'm basing my approach on:Pinouts & related informationhttps://www.mail-archive.com/time-nuts@lists.febo.com/msg01561.htmlSuper helpful write up from ZigmundRat on doing an internal GPS:https://www.eevblog.com/forum/repair/need-gps-board-for-ks24361-aka-rftgu-o/msg3547273/#msg3547273I'm using the beta Linux version of Lady Heather for checking, and the RFTG software from Ko4bb's site.I've hooked up the Tx pin of the GPS to J5 pin 4 (GPS IN), and the PPS output to pins 8 and 9 (PPS IN / GPS PPS IN), and have programmed an ATTINY85 from the code given in the previous link, which I've done quick checks via Lady Heather is generating what seem to be correct output (Lady Heather is able to get time & satellite info from the output stream).I've double verified that the J5 connector is directly wired to the internal GPS connector (no inverters or level shifting required). And using the beta Linux version of Lady Heatherseemsto pull the correct time from the unit... but the "NO GPS" indicator stays lit, and the RFTG software indicates that the GPS time on the unit is unchanging, set to midnight 1980-01-06.Wondering if anyone has tips on next steps trying to get it working -- I'm not sure if it's likely to be an issue with the GPS rollovers that have happened since the unit was deployed, a hardware issue, GPS receiver issue or something else.
High speed pulse generator - Page 1
Forum section: electronics / testgear

author: ezalys
author_rank: Frequent Contributor
timestamp: May 13, 2022, 04:38:13 pm
content: Does anyone know of a pulse generator that provides variable length pulses with a minimum of 50 picoseconds? The PSPL10070A went down to 100 ps, but is no longer available. Is there a modern alternative or are all the T&M companies just going to try and sell me an AWG?

author: ezalys
author_rank: Frequent Contributor
timestamp: May 17, 2022, 04:51:57 pm
content: Just bumping this. 100 ps I should say could be acceptable. Highland technology seems to make something around 100 ps, but I'm shopping around.

author: tggzzz
author_rank: Super Contributor
timestamp: May 17, 2022, 08:24:30 pm
content: Might be worth looking at Highland Technologyhttp://www.highlandtechnology.com/categories/digital_delay_generators.shtml

author: graybeard
author_rank: Frequent Contributor
timestamp: May 20, 2022, 12:48:14 am
content: Thisone's minimum pulse width is 300 ps, but it will do a <70ps rise time for a 5V pulse.

author: graybeard
author_rank: Frequent Contributor
timestamp: May 20, 2022, 01:01:32 am
content: Quote from: graybeard on May 20, 2022, 12:48:14 amThisBerkeley Nucleonics Modelappears to be a repacked version of theActive Technologies Generator.

author: KE5FX
author_rank: Super Contributor
timestamp: May 20, 2022, 06:32:46 am
content: A 50 ps pulse is pretty short. What's the application?
HP / Agilent 54621A 54622A - loud fan - Page 1
Forum section: electronics / testgear

author: mapleLC
author_rank: Frequent Contributor
timestamp: May 15, 2022, 10:40:48 am
content: HP / Agilent 54621A 54622A - loud fanI like having mine on all the time but the fan is loud. Has anyone replaced the fan with something quieter?

author: mapleLC
author_rank: Frequent Contributor
timestamp: May 16, 2022, 12:43:59 am
content: This thread has the same query but no responses.The concern was static pressure.https://www.eevblog.com/forum/testgear/agilent-54600-series-quiet-fan-replacement/

author: mapleLC
author_rank: Frequent Contributor
timestamp: May 16, 2022, 12:47:41 am
content: This is the fan being considered from that thread.https://noctua.at/en/products/fan/nf-a8-flxLike that poster, I would be concerned that the fan is replaced with the right kind.

author: PlaneSailing
author_rank: Contributor
timestamp: May 18, 2022, 01:47:21 pm
content: I have a 54622D with probably the same original Panasonic FBA08A12U fan, and replaced it with a Noctua NF-R8 redux-1800 ($10 Amazon). Had to file a bit of the plastic fan frame - otherwise a simple swap out, just don't use the third yellow wire. The airflow specs went down from 47CFM to 31CFM, but though OK as I'm not operating the scope in the desert at an ambient 50 degC, and the scope dates from the "over engineered" HP era. Have not experienced any cooling issues, but I do not leave it on all the time. My ears really appreciate the reduction in background noise, recommended.

author: mapleLC
author_rank: Frequent Contributor
timestamp: May 18, 2022, 04:13:08 pm
content: Damn you!I just hit submit on an amazon order like 10 minutes ago!The outcome info is much appreciated, I am going to try it and report back for others.

author: mapleLC
author_rank: Frequent Contributor
timestamp: May 19, 2022, 09:55:51 pm
content: Quote from: PlaneSailing on May 18, 2022, 01:47:21 pmI swapped mine, everything was smooth save for the screws. I didn't have to file anything.I left the 2 prong in and snipped the wire, then spliced the new fan.The screws didn't fit and this version I bought of the fan didn't have those brown mini sex toys that are ribbed and replace the screws. They feel soooo go going in.Luckily, ehem, I had a few from an old fan replacement and it works a treat. The scope is quiet as a mouse.If you have one of these, definitely make this change unless you run it hard and need the cfm, then look for something else.
Rigol MSO7054 Touchscreen Protector - Page 1
Forum section: electronics / testgear

author: dieciduej
author_rank: Newbie
timestamp: May 19, 2022, 12:28:37 pm
content: Hello all,I just recently purchased a Rigol MSO7054 oscilloscope and I'm happy with it but for one point. As Dave mentioned in his unboxing video of the MSO7054 the screen is vastly reflective, which is an issue with my bench arrangement and lighting. I either see myself, and I have a face made for radio, or the room lighting.Has anyone tried any of the touchscreen oscilloscopes with a matte finish screen protector? Just looking for some feedback on the issue.Thanks.

author: Fungus
author_rank: Super Contributor
timestamp: May 19, 2022, 12:47:06 pm
content: Micsigs are shiny but they come with a matte screen protector in the box. It's definitely ahugeimprovement when it's on.I'd definitely try one if it bothers you, they're only about $10 and very easy to apply if you know the tricks.(I hate shiny screens...)
Keysight InfiniiVision 3000G X‑Series Oscilloscopes  Linux ? - Page 1
Forum section: electronics / testgear

author: msuthar
author_rank: Contributor
timestamp: May 19, 2022, 03:03:44 am
content: nfiniiVision 3000G X‑Series Oscilloscopes ,Yesterdays question answer session did I hear linux ?one more hint was that same processor and architecture shared between 1000G series and 3000G series.Can any one zoom in and find out ?[attachimg=1

author: TheSteve
author_rank: Unknown
timestamp: May 19, 2022, 03:28:19 am
content: Perhaps some other newer scope will run linux. As of right now Keysight has firmware posted for the 3000G series on the website and it is identical to the 3000T series. So WinCE it is.
Fluke 355 - Page 1
Forum section: electronics / testgear

author: RAL97
author_rank: Newbie
timestamp: May 19, 2022, 08:04:55 am
content: Hello everyone,Hope you are doing great.I have a Fluke 355, but the right jaw that has the flat cable is broken just 1 mm when it comes out the inner section of the clamp. Trying to fix it I did some permanent damage to it and now it cannot be fixed anymore. I contacted Fluke for a spare jaw but they didn't agree on it saying is beyond repair. So I am asking you my fellow EE enthusiast where to find this specific part.Any help or indication is greatly appreciated.Thank you very much for your time.Best Regards

author: BeBuLamar
author_rank: Super Contributor
timestamp: May 19, 2022, 09:37:46 am
content: How old is the meter?

author: RAL97
author_rank: Newbie
timestamp: May 19, 2022, 09:40:46 am
content: to be honest i don't know. If you want I can send you the serial number.

author: BeBuLamar
author_rank: Super Contributor
timestamp: May 19, 2022, 11:14:13 am
content: Well it's an expensive meter and is warranted for 3 years. So that is the reason why I asked. If it's less than 3 years just send it to Fluke. Actually I would contact Fluke for the repair any way even if it's out of warranty.

author: RAL97
author_rank: Newbie
timestamp: May 19, 2022, 11:46:41 am
content: Well I contacted them and they said that Fluke doesn't repair this model, even changing a part they don't do it.That' why I am asking and searching for a third party retailer. I also thought of using the clamp of Fluke 319, but the flat cable was very short.

author: BeBuLamar
author_rank: Super Contributor
timestamp: May 19, 2022, 12:23:21 pm
content: Very strange! The 355 as well as the 353 are quite expensive and yet they are made in China. Perhaps Fluke rebrand them?? Anyone knows?

author: RAL97
author_rank: Newbie
timestamp: May 19, 2022, 12:56:12 pm
content: To be honest I don't have any idea. I didn't even managed to find a service manual. I am writing to different companies in USA, that repair fluke in hope they can give me a solution. But because I live in Albania, I doubt they will ship me the part I need.
Tektronix TDS3064B probe sensing terminals - scope reset - Page 1
Forum section: electronics / testgear

author: adsos
author_rank: Newbie
timestamp: May 17, 2022, 08:08:24 am
content: Hi All,I recently bought a used Tektronix TDS3064B - seller mentioned that the control board (front panel board) got replaced. I was hooking it up to a signal generator to do some initial testing using ordinary BNC connector and noticed that when pushing it in, the scope would reset. The only explanation is that the BNC connector shorts the probe sensing pads on the scope. My question is - is it "normal" or should I be worried that the scope is faulty?Many thanks for all replies!

author: picburner
author_rank: Frequent Contributor
timestamp: May 17, 2022, 08:46:52 am
content: Hi,the distance between the top of the female BNC and the sensing pad is about 11.30mm. I tried to insert a non-isolated male BNC and, even when pressing, it does not touch the sensing pad (even if it goes very close).Check that the distance between the top of the bnc and the sensing pad is not less than the measurement I have provided.

author: adsos
author_rank: Newbie
timestamp: May 17, 2022, 09:12:21 am
content: Thanks a lot for the info - I will check the distance. Would you know if shorting the sensing pads would cause the scope to reset?

author: picburner
author_rank: Frequent Contributor
timestamp: May 17, 2022, 09:17:31 am
content: On the sensing pad there are the power supplies for the probes, + 5V/-5V, +12V/-12V.These voltages should be protected by a PTC for each line but if the bnc touch in the bottom shorting everything together to ground it is understandable that the scope will reset.

author: adsos
author_rank: Newbie
timestamp: May 17, 2022, 09:46:40 am
content: Thanks again for explanation - I would have expected the scope to issue an error message instead of abruptly resetting but I guess it is what it is. Now I suspect that either I have some doggy BNC connector which is not of the standard size but more likely, after installing the control board, it was not seated properly and is moved a little bit inward - I will check it after I receive my USB floppy emulator as don't want to open up the scope twice....
Mastech ms5308 on discount on amazon - Page 1
Forum section: electronics / testgear

author: davebb
author_rank: Frequent Contributor
timestamp: May 18, 2022, 06:24:57 pm
content: Hi i have just got a Mastech ms5308 on discount on amazon,https://www.amazon.co.uk/gp/product/B07HT2HW7N/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1the unit has 30% off price, So it cost £128.13 with all test leads and a nice bag, but no ac adaptor, there is a long list of postsabout the one that use to be supplied with the tester,i had it the next day with prime, the only problem i had with it was it kept tuning it self on and then off as soon as you tuned it on, so i opened up the unit, there are no anti tamper labels, and on the main pcb were the power switch is wired to both wires were stripped to long, and the wire was going over the other pad/track it was so close that you could push down on the case and it would turn on,off,all is fixed now after 5mins,it has the same chip set as the DER 5000 tester ,i am playing and learning now, i just need to find out what size dc plug i need for it,Thanks Dave 2E0DMB
brymen bm525s logging ?? - Page 1
Forum section: electronics / testgear

author: picclock
author_rank: Contributor
timestamp: May 15, 2022, 10:20:15 am
content: I've recently purchased from Welectron (thanks J-R), a Brymen 525S, with the usb dongle for readout to pc of stored data.Great meter but ..Although I can upload the meter Data, and save it, it's in a propriety .slr format.Does anyone know of a format conversion tool, say .slr to .csv ??Cant even copy and paste from the screenBest Regardspicclock

author: J-R
author_rank: Super Contributor
timestamp: May 16, 2022, 02:21:08 am
content: I don't have this exact model, but is perhaps what you're looking for under the Export button instead of Save?

author: picclock
author_rank: Contributor
timestamp: May 16, 2022, 06:25:18 am
content: @J-RI'm an idiot, and your spot on correct. The export button/menu item sorts it all, allowing csv data, and graphical bmp's.I suspect brain fade .. .Clicking the data import button on the Graphical Recorder, which then opens a new window with the Data Logger, on which I have to click data import again to get it displayed (Logger icons have no help text), seems a bit naff, like its been bolted on as an afterthought.Despite this minor idiosyncrasy, its a very impressive meter, and the ability to log things in such a portable way is incredibly useful.Thanks for your assistanceBest Regardspicclock

author: J-R
author_rank: Super Contributor
timestamp: May 16, 2022, 05:58:25 pm
content: It's not you, the software is a bit rough!I see HKJ's Test Controller software supports the BM525s, not sure about downloading the logged data. Might be worth checking into.https://www.eevblog.com/forum/testgear/program-that-can-log-from-many-multimeters/
Pricing DP832 - Page 1
Forum section: electronics / testgear

author: metrologist
author_rank: Super Contributor
timestamp: May 16, 2022, 02:30:55 pm
content: There is a used one no accessories. I usually target 2/3 retail and I offered $350 for this one and he wants $400. So I guess it would be at least $100 for a new one, with a discount if I find one, with free shipping and tax.I am mildly interested in entertaining this offer a bit more, to see if he will provide delivery. Maybe that will make it more worth it?Used, like new, might have an issue, no warranty, and still used. I've almost talked myself out of it.
Neutrik A2 - Page 1
Forum section: electronics / testgear

author: our.man.flint
author_rank: Newbie
timestamp: May 14, 2022, 02:37:12 pm
content: Hi folks. I wonder if anyone can help with my A2. I just bought it, upgrading from my ancient HP339a with all its broken plastic dials, and have stupidly, eagerly, pressed all the wrong buttons and got it stuck trying to calibrate. Unboxed it, saw a poor noise floor reading on ch b, thought I'd try the calibration routine and, well, now I'm buggered. Looks like ch b has an input problem, repeated low gain messages and no obvious way to cancel the calibration. Every power cycle its back. After that just to make it all worse I've pressed buttons during power up and now its looking for a digital input, it doesn't doesn't have the digital option fitted but, well, after holding down the level button during power up it wants to see one..Muppet.Anyone, pleae help!!

author: our.man.flint
author_rank: Newbie
timestamp: May 15, 2022, 01:19:20 pm
content: So I’ve found the settings page and turned digital in off and have found the ‘next step’ button which lets you skip through the failed tests and complete the cal. Done. Lots of failed tests. The machines no good. No outputs basically, I’m guessing I was getting input gain errors during cal. as there’s literally only a few millivolts of level on the signal outs. Also if I plug in a tone from my hp339, it can’t read it. I’ve bought a turkey, eBay return procedure has been started!

author: our.man.flint
author_rank: Newbie
timestamp: May 15, 2022, 01:20:12 pm
content: I am interested in the service manual if anyone has it
Can Rigol MSO5000 series do multiple horizontal scales? - Page 1
Forum section: electronics / testgear

author: Doogs75
author_rank: Newbie
timestamp: May 14, 2022, 08:45:28 am
content: Hi. After work (school) foolishly throwing out a great old CRO (that weighed a tonne), I've delved into the world of digital oscilloscopes, in particular the Rigol MSO-5074 (a product creep/upsell from a 1000 series). I've been very surprised to find that they don't seem to support multiple/different horizontal scales - something the old analogue CRO did well. Looking through the manual seems to suggest "No", and there seems to be no-one who has asked the question (according to Google and my searching on this forum.Does anyone know if it's possible (hidden feature, hack, big obvious button I'm missing, obscure menu, whatever)? I'd really like to use it (as I used to with the CRO) to show kids to show the method used by PWM dimming of LEDs and trailing-edge dimming of a triac based dimmer.... Funnily enough, 20Mhz and 50Hz don't quite show well at the same scale! Any suggestions, techniques to achieve the above, or ideas greatly appreciated (not sure if I can return/swap it if other makes/models do the job - but I'd try if they're ball-park same price). Absolute confirmation of "No" will also be appreciated, but in a different way.Thanks in advance.

author: Fungus
author_rank: Super Contributor
timestamp: May 14, 2022, 09:40:44 am
content: The feature you want is called "Alternate Triggering". I don't know of any DSOs that can do it. It's just not the way they work.There might be one somewhere but the Rigol MSO5000 isn't it.Cue list of DSOs that can do it...

author: Doogs75
author_rank: Newbie
timestamp: May 14, 2022, 01:16:26 pm
content: Amazing what knowing the correct terms mean.... here's a pre-existing thread on the topic, which makes it sound like I'm actually after multiple timebases, which doesn't seem to exist any more:https://www.eevblog.com/forum/testgear/out-of-curiosity-are-there-dsos-with-alternate-trigger/And this thread which degenerates into analogue/digital, but still has some interesting info scattered throughout.https://www.eevblog.com/forum/testgear/dual-timebase-oscilloscopes/

author: 2N3055
author_rank: Super Contributor
timestamp: May 14, 2022, 04:00:34 pm
content: Quote from: Fungus on May 14, 2022, 09:40:44 amAlternate triggering is useful to look at signals that are similar in frequencies but not related so you need to trigger on then separately 1 -2 ,1-2 ..If one signal is millions of time faster, you need alternate triggerandseparate timebases (or two different zoom ratios....).If you are looking at PWM that gets demodulated to 50 Hz, you trigger on demodulated signal, that one will be synchronous with PWM modulation, and look at high frequency signal in zoom window....

author: egonotto
author_rank: Super Contributor
timestamp: May 15, 2022, 11:30:37 am
content: Hello,the DSO 2074G can trigger from all active channels with individual timebasehttps://www.eevblog.com/forum/testgear/experience-with-dso-2074g/msg1194745/#msg1194745egonotto
Tektronix TLA6402 68 Channel Logic Analyzer - help? - Page 1
Forum section: electronics / testgear

author: keepitsimple
author_rank: Newbie
timestamp: May 15, 2022, 06:24:57 am
content: Sorry if I'm in the wrong area, here. I posted this in the sale section earlier, but someone on Reddit suggested I try this particular section of the forums because it's a really specific item. I'm actually hoping someone can help me figure out a fair price for this thing. There is one of these with no extras on eBay right now for 9 grand - whether that itself is fair or not, I have no idea. I know absolutely nothing about logic analyzers.The one I have includes what seems to be about $2,500 worth of probes and extra gear, plus a Tektronix cart made for this thing. It's got:2 bags TPP1000 probesP5910 probe or connector thingaccessory kit 020-2662-01dust protectordocuments and manualskeyboard/mouse and coverIt looks great - clean as hell and boots up fine. I'm not even positive if the thing was used.This seems to be a fairly niche item, and from what I can tell, most people buy much smaller logic analyzers for under 2 or 300 bucks. Should I list this stuff to match the eBay guy's price? Or would I just end up sitting on it for months? I could use the cash and am not too greedy - maybe I should just start an auction at around 5k and hope it goes higher?Excuse the messy background - my tiny office/warehouse is packed and needs a good cleaning.Any advice or input would be appreciated - thanks!

author: james_s
author_rank: Super Contributor
timestamp: May 15, 2022, 07:00:22 am
content: It's worth whatever someone will pay for it. A rough guess I'd say a few hundred bucks to the right buyer, there is not much demand for logic analyzers these days, I paid $25 for my 128 channel HP logic analyzer and spent another $200 on probes, mine is only 100MHz but I use it to work on vintage equipment which I think is probably what most people are using a logic analyzer for. Ignore the asking prices on ebay, many of them are pure fantasy and the stuff just sits forever. Search by sold items and see what similar units have actually sold for. I could be completely off base but I would be absolutely shocked to see any logic analyzer sell for $5k, they just have very limited applications these days since modern gear is so tightly integrated. A high performance model like this was state of the art maybe a decade ago, but now it's faster than needed for vintage gear but not fast enough to debug modern high speed systems.

author: TiN
author_rank: Super Contributor
timestamp: May 15, 2022, 08:12:01 am
content: 5k is unlikely, as far more versatile TLA7012 sell for few K$ lately, often even less. I got mine for $600 and bunch of modules including PCIe Gen3 one for few hundred $. TLAs also have no support from Tek anymore, as lineup officially killed.
Advantest R3132 firmware - Page 1
Forum section: electronics / testgear

author: frettore
author_rank: Newbie
timestamp: March 09, 2017, 12:32:39 pm
content: Hi,I'm looking for the firmware of this SA.My R3132 doesn't complete the boot sequence, and I suspect a CF card corrupted.Unfortunately I didn't make a copy.Does anybody knows where to get an image of the CF card?

author: nctnico
author_rank: Super Contributor
timestamp: March 09, 2017, 12:42:26 pm
content: Are you sure you got the right model number? The R3132 doesn't have a CF memory for the firmware.

author: frettore
author_rank: Newbie
timestamp: March 13, 2017, 12:18:34 pm
content: I confirm is a R3132, here is a pic of the mainboard

author: nctnico
author_rank: Super Contributor
timestamp: March 13, 2017, 12:37:43 pm
content: That looks way more different from the R3131 than I expected. Sorry.

author: prot_brot
author_rank: Contributor
timestamp: December 25, 2017, 07:56:39 pm
content: I know this is an old topic, but just in case if you still need it.Hope that helps.

author: IW1EPY
author_rank: Newbie
timestamp: February 12, 2018, 05:22:17 pm
content: my R3132 have lost the narrow band option 27 .No way to recover?

author: rainbow
author_rank: Contributor
timestamp: May 16, 2022, 06:48:00 am
content: IW1EPY: have you tried to use the R3131 procedure?Code:Use the following sequence to restore the TG option:<Shift> <9>Password: 882323 <Hz>"TG Option >""Load"“Exit”
Keysight DSOX1102G trigger offsets at different volts per division - Page 1
Forum section: electronics / testgear

author: Anthocyanina
author_rank: Frequent Contributor
timestamp: May 15, 2022, 04:23:35 am
content: I got this scope a few days ago, and today i noticed that the trigger point is offset from where it's set. The offset varies with different volts per division settings on the same waveform. Is this a common thing with this oscilloscope? is it fixable? Since it was factory calibrated in 2019, i ran a user cal after it had been running for about an hour so it was at a stable temperature, and it was the same after it was done. all self tests passed too, both before and after i did the user cal.Thank you!
Unable to read from HP-IB device using Agilent E5810A and python-vxi11 - Page 1
Forum section: electronics / testgear

author: matthuszagh
author_rank: Frequent Contributor
timestamp: May 15, 2022, 12:00:51 am
content: I'm trying to setup a collection of old HP-IB instruments for programmatic access, but I'm having some trouble reading data from devices. Sending data works fine. I'm using an Agilent E5810A LAN/GPiB gateway as the HPIB interface.I've tried two methods: the first is simply to login to the e5810a web interface using the local IP and the "Find & Query Instruments" tab. The second is to use the python-vxi11 package. Both methods yield the same results. For example, here's the output when using python-vxi11:Code:>>> import vxi11>>> e5810_ip = "192.168.4.43">>> e5810 = vxi11.InterfaceDevice(e5810_ip)>>> e5810.find_listeners()>>> hp3457a = vxi11.Instrument(e5810_ip, "gpib0,22")>>> hp3457a.write("RESET")>>> hp3457a.write("NPLC,100")>>> hp3457a.write("DISP,OFF")>>> hp3457a.write("DISP,ON")>>> hp3457a.write("NPLC,10")>>> hp3457a.ask("STB?")Traceback (most recent call last):File "<stdin>", line 1, in <module>File "/nix/store/3582hv8bqn3b6rv7gs0llxpakwpj2ncj-python3-3.9.9-env/lib/python3.9/site-packages/vxi11/vxi11.py", line 743, in askreturn self.read(num, encoding)File "/nix/store/3582hv8bqn3b6rv7gs0llxpakwpj2ncj-python3-3.9.9-env/lib/python3.9/site-packages/vxi11/vxi11.py", line 731, in readreturn self.read_raw(num).decode(encoding).rstrip('\r\n')File "/nix/store/3582hv8bqn3b6rv7gs0llxpakwpj2ncj-python3-3.9.9-env/lib/python3.9/site-packages/vxi11/vxi11.py", line 701, in read_rawraise Vxi11Exception(error, 'read')vxi11.vxi11.Vxi11Exception: 15: IO timeout All the write commands appear to work as expected. Using the web interface is similar, but I just enter the contents between the quotes in the entry line and then use send or query instead of write or ask, respectively.Several other observations:- using the "Read STB" button of the E5810A web interface works: it reads data fine. So, it seems like I'm doing something wrong with my queries, rather than there being a hardware fault. I also get the same results for another instrument, which also suggests the problem is with something I'm doing.- the 3457A seems to beep when I give it a bogus command (e.g., write("badcmd")). But the timeouts don't beep.I expect I'm missing something simple here, but I don't see it. Any help appreciated, thanks!

author: Venturi962
author_rank: Regular Contributor
timestamp: May 15, 2022, 01:51:25 am
content: HP 3457A is a bit different in that it doesn't assert GPIB EOI after a Reset (you can check a list of all the settings that the Reset command sets in the Operating Manual), this will cause timeout issues as it looks like the transmission hasn't ended. To test out if that is the issue, after you issue the RESET, write 'END ALWAYS' and then try to ask/query the 'ID?' command.

author: matthuszagh
author_rank: Frequent Contributor
timestamp: May 15, 2022, 03:02:08 am
content: Quote from: Venturi962 on May 15, 2022, 01:51:25 amThat worked, thanks!
Beware of cheap Kelvin clips - Page 1
Forum section: electronics / testgear

author: NaxFM
author_rank: Regular Contributor
timestamp: May 14, 2022, 10:41:29 pm
content: I needed a pair of 4 wire Kelvin clips to use with my 6,5 digit multimeter.Nothing fancy, so I opted for those cheap Chinese clips you find everywhere on aliexpress.I knew that the quality with unknown brands was questionable, so I bought them from the official Uni-T store, since I have a Uni-T UT61E and I love it.https://a.aliexpress.com/_mLj5XN4Today the clips arrived, togheter with a receipt with my name and the Uni-T branding.Well, they don't work...They totally neglected to connect both Low terminals to the clips. The cables are coaxial and as you can see on the picture only the core is soldered to one side of the clips, the shielding is just cut and with a shrink wrap applied...I knew I wouldn't have received something similar to Pomona 250$ clips, but still, coming from a big brand like UNI-T I expected at least they were assembled properly...Anyway, I asked a refund and the clips are already fixed and working, this was just a little rant to tell you to not expect a working product when you order this type of clips...

author: Martin72
author_rank: Super Contributor
timestamp: May 14, 2022, 10:52:13 pm
content: Hmmmm......Must take a look at my clips, got two versions with bananas and bnc...
Is Trenz a reputable source for FPGA eval kits (TEF1001) - Page 1
Forum section: electronics / testgear

author: matthuszagh
author_rank: Frequent Contributor
timestamp: May 12, 2022, 05:59:22 am
content: I'm starting a project using a Xilinx Kintex-7 160T FPGA. Before I design this system myself I'd like to prototype it with guaranteed-working hardware. Trenz sells an eval board that is nominally suitable (TEF1001,https://shop.trenz-electronic.de/en/TEF1001-02-B2IX4-A-PCIe-FMC-Carrier-with-Xilinx-Kintex-7-160T-4-Lane-PCIe-GEN2-DDR3-SODIMM-ECC?c=524) and reasonably priced. The only other suitable option I've found is the KC705 from Xilinx, which is nice but much more expensive (it uses an upgraded FPGA too, but that's ok with me).Does anyone have any experience with Trenz in general, and their eval kits in particular? Especially interested to know if anyone has used this particular eval board.

author: KE5FX
author_rank: Super Contributor
timestamp: May 12, 2022, 07:41:44 am
content: I've never used one of Trenz's products but I've always liked how accessible their product documentation is. They've been around forever and I wouldn't hesitate to use them if I needed to.AFAIK the free Vivado edition doesn't support the XC7K325T, only the XC7K160T. So if you go with the KC705 board and don't already have a paid-up Vivado license, make sure it still has a valid entitlement certificate for Vivado. The KC705 I bought several years ago for a specific project came with an ISE 14 certificate, and I'm sure I'd be up the creek if I needed to use it today.

author: matthuszagh
author_rank: Frequent Contributor
timestamp: May 13, 2022, 12:49:28 am
content: Quote from: KE5FX on May 12, 2022, 07:41:44 amThat's my understanding too. The eval kit does come with a Vivado license, with 1 year of updates. Their documentation seems a bit contradictory on whether this means the license expires after 1 year, or just that you can no longer update Vivado/ISE/whatever. For example, in the UG973 they state (emphasis mine)QuoteBut, in the forums (https://support.xilinx.com/s/question/0D52E00006hpm3LSAQ/question-about-license-for-zcu111-evaluation-kit-license-length?language=en_US) they clarify that the 1 year is just for updates, the license tied to a specific version of Vivado/etc. is permanent. So you might be stuck with old software, but at least you'll still be able to use it without shelling out more money.In any event the Trenz option looks like a better deal, if only either of this would become available again...
Python library for DE-5000 LCR meter - Page 1
Forum section: electronics / testgear

author: 4x1md
author_rank: Regular Contributor
timestamp: September 16, 2017, 09:15:54 pm
content: I created a simple Python library for reading data from DE-5000 LCR meter which was much discussed here.As I don't have the original USB module, I used the RS-232 IR receiver which comes with UNI-T UT61E. It is not mechanically compatible with DE-5000 but was enough for experimenting.The code with detailed description can be find here:https://github.com/4x1md/de5000_lcr_pyI hope somebody will find this library helpful.

author: thomasLE
author_rank: Newbie
timestamp: May 14, 2022, 03:39:41 pm
content: Thanks for your Python library 4x1md! I did find it helpful indeed.I took the liberty to fork your repository and make some changes. Most notably I made it compatible with Python 3and added support for writing the output directly to a CSV file.For anyone who's interested, here's the GitHub repository:https://github.com/tsitle/der_ee_de5000_lcr_meter_cli/