hybridfree/eevblog-posts huggingface dataset:
Rigol MSO5000 - Custom Label for Parallel Decode Bus? - Page 1
Forum section: electronics / testgear

author: meener777
author_rank: Newbie
timestamp: August 03, 2022, 05:29:04 pm
content: Hey all, I have a Rigol MSO5000 scope and I am trying to decode some digital information using two parallel busses. I would like to label them so instead of Parallel 1 and Parallel 2 they would say e.g. Row, Column (this is a 41416 ram chip, I am looking at address info coming in). Labelling LA lines is easy to find but I cant seem to find any way to customize the labels for the decode lines. Anyone happen to know how to do that?

author: Marko56
author_rank: Newbie
timestamp: August 07, 2022, 08:21:56 pm
content: With LA on select Label (above More) -> select Display-ON. Select the Data Line(D0-15) and select Label. Keyboard will come up and you can set Label name

author: Kean
author_rank: Unknown
timestamp: August 08, 2022, 02:21:37 pm
content: Quote from: Marko56 on August 07, 2022, 08:21:56 pmOP wants to change the label on a parallel decode, not on a single data line.I had a look and cannot find any way to do that on my MSO5000, while it is possible on my RTB2000
CDE VTVM Mode BF100 - Page 1
Forum section: electronics / testgear

author: Robbdoe1
author_rank: Contributor
timestamp: August 06, 2022, 10:45:35 pm
content: Hello it's my first post here. Has anyone ever heard of a Cornell Dubilier BF100 VTVM? I can't find anything on it anywhere. Not even a single picture....yet one sits before me on my bench. Thanks for any help.Robb

author: Robbdoe1
author_rank: Contributor
timestamp: August 06, 2022, 10:47:57 pm
content: Here is a picture of mine.

author: Robbdoe1
author_rank: Contributor
timestamp: August 07, 2022, 07:48:09 pm
content: Anyone? It's the familiar circuit of a Heathkit V-7A
Probe Master - Can check my order looks reasonable? - Page 1
Forum section: electronics / testgear

author: dreamcat4
author_rank: Frequent Contributor
timestamp: August 07, 2022, 02:09:54 pm
content: Hi,Would like opinions trying to get my order right.So heres my current Shopping Cart over on Probe Master website. (If you ignore the 72" inch leads length, just happen to have have a very large desk...)* what could be added?* what could be removed?* what are you kicking yourself that you now really want but perhaps didn't know should get?Many thanks for any probe master owners out there. Also does anybody happen to have a discount coupon that is still valid? If not no worries, just seemed worth to ask.

author: dreamcat4
author_rank: Frequent Contributor
timestamp: August 07, 2022, 02:12:51 pm
content: Direct links to each item(s):#1https://probemaster.com/spring-loaded-micro-tip-test-lead-kit/#2https://probemaster.com/8000-series-test-lead-master-kits/#3https://probemaster.com/4958ph-pico-hook/#4https://probemaster.com/4956-pincer-micro-hook/#6https://probemaster.com/9182-test-lead-holder/#7https://probemaster.com/9176-test-lead-pouch/

author: dreamcat4
author_rank: Frequent Contributor
timestamp: August 07, 2022, 02:41:19 pm
content: oh forgot to mentionor if anything else from probe master is useful for adapting to DE-5000 also. (as an extra bonus)... but perhaps not idk. people seem to use other accessories for that
Question regarding Extech 350/355 - Page 1
Forum section: electronics / testgear

author: 9voltbrain
author_rank: Contributor
timestamp: July 11, 2022, 05:44:35 pm
content: Hi, I’m new to electronics and wanted to get myself a decent all-purpose multimeter for around 100 bucks, although for now it’s only going to be used for low voltage circuits. I live in Sweden so the selection of meters here aren’t that great. However, one reputable store does have the Extech EX350 and the EX355, which both seem like good options. The EX355 has 6000 counts and a temperature measurement for 20 bucks more.There aren’t many reviews to read about these. I found one inthis communitywhich complained about the continuity test being very slow. But I’m wondering which part of the test is slow. Is it the beeping or is it the exact ohms measurement showing up on the display? Because I don’t care much for the exact measurement, just that it beeps as fast as possible.Any other general impressions would be appreciated.

author: Martin72
author_rank: Super Contributor
timestamp: July 11, 2022, 09:45:04 pm
content: Hi,QuoteFor fast continuity tests I guess.Note that most meters will beep under a specified low resistance value, not directly zero or near by zero ohms.Apart from this, some brymen meters are in the same price range.

author: 9voltbrain
author_rank: Contributor
timestamp: July 12, 2022, 11:50:53 pm
content: Quote from: Martin72 on July 11, 2022, 09:45:04 pmYeah, I know that from the 10 dollar multimeter I already have. It takes it about a second to activate the buzzer though so holding it for that long gets pretty obnoxious. I'm hoping this one is faster.

author: Gianni
author_rank: Contributor
timestamp: August 06, 2022, 08:15:52 pm
content: I wish to report my experience with the 350. I bought it last year and I was satisfied with it. Then the continuity test started to no longer show the resistance value, but only beep/not-beep. Then it begun to get slower and slower on all the measures (many seconds).I asked for the assistance from Mouser, who sold it to me. They said me that they were not involved in assistance, so I should contact Extech. Extech don't answer to my request, so I go again to Mouser, telling them that, according Italian law, I had the right to ask assistance from the last ring of the chain, when the OEM was not responding.They said that they were not going to fight with my company for that, and send me the money back.Their attitude did not satisfy me entirely: I am not a troublemaker, I was asking only what most of us normally does with their customer.Any idea on how to repair it?
Lamps for Tek 7000-series graticule - Page 1
Forum section: electronics / testgear

author: Gianni
author_rank: Contributor
timestamp: August 05, 2022, 07:33:40 pm
content: Hi,I am not able to find spare lamps for Tektronix 7603 and 7633 oscilloscopes. According the manuals they should be:150-0029-00 for 7633150-0047-00 for 7603although they seems similar to me.There is only on seller on eBay proposing them, asking more than I spent for the oscilloscope itself (57$ + 50$ for shipping + custom)!Beyond trying to build something like that with a LED, any other idea?Thanks

author: PaulAm
author_rank: Frequent Contributor
timestamp: August 05, 2022, 08:49:11 pm
content: When you're trying to find something like this, google the Tek part numer and find a government supplier website, they will usually have the NSN number. You can then cross check the NSN number to a different supplier (eg GE) and get an actual part number.The 150-0029-00 is a 349 and the 150-0047-00 is a 398. Just quickly looking, I found the 349 for $1.59 each and the 398 for $1.25. Google those part numbers and you should find something reasonable.

author: Gianni
author_rank: Contributor
timestamp: August 06, 2022, 06:20:10 am
content: Very good, thank you very much!
Kenwood PWR18-1.8Q Linear Power Supply Calibration - Page 1
Forum section: electronics / testgear

author: pwr19
author_rank: Newbie
timestamp: August 06, 2022, 03:17:41 pm
content: Hello All,I have an old Kenwood PWR18-1.8Q linear power supply that works but the reported voltages are inaccurate by as much as 0.8 V.I just can't find any calibration procedures online.I found some information here:http://agilent34970a.blog.fc2.com/blog-entry-71.html?_x_tr_sch=http&_x_tr_sl&_x_tr_tl&_x_tr_hlCan anyone help with how to calibrate?I did open the unit and found two pots. But the silk screen is not very clear.

author: wn1fju
author_rank: Frequent Contributor
timestamp: August 07, 2022, 11:27:19 am
content: Yes, the schematic doesn't seem to be readily available online (for free).What I would do is first record the position of the two pots, then turn them a little and see what the effect is. My guess is that they are not actually adjusting the voltage and current directly, but more likely are just responsible for the two meter readings.In other words, hook up a load, an external voltmeter and an external ammeter, and see what happens when you turn the pots. If my guess is correct, only the power supply's meter readings will change.Normally, one calibrates these things by adjusting the pots so that the meter readings agree with your external metering at the full rated voltage and the full rated current.
HP 3580a known problems - CAL signal & red LED subassembly? - Page 1
Forum section: electronics / testgear

author: slbender
author_rank: Regular Contributor
timestamp: August 03, 2022, 09:07:52 am
content: Hi, all knowledgeable techs,I recently received a vintage later HP 3580a with LED digital readout. The set has a proper CRT display showing both the baseline and sweep. It appears that the red led readout display, along with the internal CAL signal are inop. and that assembly is somewhat bulging outward like the top of a bad ‘lytic capacitor.Removing the top cover, I noticed that from a prior repair, several internal screws are missing, and there is a 20 pin connector coming from that right side LED subassembly that instead of being on its 20 pins, has been forced/jammed into the space near its 20 pins, with none of the pins making electrical contact.The whole red LED readout subassembly seems to be held in place by about ten to twelve screws on the right side of the set. Is anyone sufficiently familiar with that red LED subassembly, and its switches, who can tell me for sure that the CAL signal also originates in there, or are there two different problems to solve here?Thanks,Steven

author: slbender
author_rank: Regular Contributor
timestamp: August 03, 2022, 07:37:21 pm
content: UpdateI pulled the subassembly out, plugged in the 20 pin connector and now the red LED assembly and the CAL signal are present and working pretty much as expected, might need some adjustments but working as expected.Steven
Are Rigol license keys automatically sent on purchase? - Page 1
Forum section: electronics / testgear

author: Ross
author_rank: Contributor
timestamp: August 01, 2022, 01:31:39 am
content: Hi Team,I was just wondering if there is anyone out there that has purchased a Rigol Options key via their USA website, if so did you get the key straight away? or did it need someone to send it to you?I know if you purchase from a distributor outside the US, it can take up to a week to get the key sent.Thanks,Ross

author: tautech
author_rank: Super Contributor
timestamp: August 01, 2022, 05:18:38 am
content: I wouldn't think so.Our experience since we are on the same piece of dirt as you are is unless we have licenses already in stock we must contact Siglent and order them then wait for their PI for us to pay and then a few days for the USD funds they want to be cleared into China banks, then another day or 2 before they get generated and finally emailed to us so to be emailed to the customer.Fast moving licenses we normally stock but the more obscure ones need be ordered and as you can see from the description above takes some mucking around and a good amount of time.Then if we run out then rather than place a special order for a couple or maybe just one if it's an oddball and less common license, we might instead wait for our next stock order and add it to that for just a single larger transaction that will invoke a smaller % of forex fees.At one time before free decode licenses were included in instruments, keeping up with option licensing was a real chore and sucked more cost in time than what profit there was in selling licenses.Anyways, I guess if you're buying Rigol Licenses from the US then MasTec NZ pricing or Ozzie Emona pricing (their supplier) is a bit steep.

author: Ross
author_rank: Contributor
timestamp: August 04, 2022, 12:26:17 am
content: So for any out there who wants to know, it isn't instant, it takes up to a week to get them sent to you via email.

author: Marko56
author_rank: Newbie
timestamp: August 05, 2022, 11:46:22 pm
content: Thanks for the info. I just sent them a scathing email since it's been over a week and all the serial decode trial licenses have expired.... which is the feature I bought the scope for.
Why there's no any bus analyzers plugins for Tektronix TDS5000.7000 series scop  - Page 1
Forum section: electronics / testgear

author: smaultre
author_rank: Regular Contributor
timestamp: July 26, 2022, 03:05:41 pm
content: Hello my friends. There's ton's of plugins for these series of scopes, but i didn't find any low speed bus analysers rs-232 e.t.c.Why? I can't find any reason's.

author: vmax
author_rank: Contributor
timestamp: August 03, 2022, 01:20:58 pm
content: If these functions is necessary, you just need to replace your oscilloscope.

author: smaultre
author_rank: Regular Contributor
timestamp: August 04, 2022, 02:29:20 pm
content: No, i means is there any hardware/software problems with extracting and decoding the data from beam?

author: PaulAm
author_rank: Frequent Contributor
timestamp: August 04, 2022, 04:09:51 pm
content: At the time these were in production, there wasn't a big call for that type of device. RS232 pretty much topped out at 9600 baud and there really weren't any other serial protocols. Parallel buses could be handled by a logic analyzer, and there was a LA plugin (7D02) available. HP made a GPIB analyzer, but it was pretty limited compared to what you might find now (sigrok and a $10 Saleae clone will run rings around the HP device). With some work you could use a high end LA to decode parallel buses, but it really wasn't in the state of the art at that point.Note: I'm assuming you're referring to the Tek 7000 and 5000 series here.
Rigol VS Hantek VS OWON - Page 1
Forum section: electronics / testgear

author: master.nasr
author_rank: Newbie
timestamp: August 03, 2022, 02:26:11 pm
content: Hi everyone, I'm going to buy a 4 channel oscilloscope for about $400. In my country Rigol DS1054Z (50MHz), Hantek DSO4104B (100MHz) and OWON SDS1104 (100MHz) are available and are at the same price.Theproduct overall qualityis more important than bandwidth and other technical specifications for me (because I want to start some power electronic circuits design and I need something durable). which brand (Rigol, Hantek, OWON) do you think is more reliable?In other words, imagine you're buying one of these for yourself, which one do you buy?

author: wraper
author_rank: Unknown
timestamp: August 03, 2022, 02:31:21 pm
content: DS1054Z has much better hardware than other scopes you mentioned but it also has much better software. Not that Rigol scopes have no bugs but at least they get fixed over time and DS1054Z is a quite mature model. There are better models than DS1054Z at similar price, but not sure if they are available in Iran and how much they cost in comparison. EDIT: want to add that I don't know about particular Hantek scope but Hantek tends to abandon what they release. Once I bought their logic analyzer which recently released. It had so broken firmware and PC software it was basically unusable. Guess what, they never released an update from initial version.

author: Fungus
author_rank: Super Contributor
timestamp: August 03, 2022, 02:32:12 pm
content: Rigol all the way. They're a better 'scope and totally solid build with full metal chassis.(note: the DS1054Z can easily be unlocked to 100Mhz)

author: master.nasr
author_rank: Newbie
timestamp: August 03, 2022, 02:48:50 pm
content: Quote from: wraper on August 03, 2022, 02:31:21 pmThanks, would you please write these models names, so I can search for them?

author: wraper
author_rank: Unknown
timestamp: August 03, 2022, 02:59:27 pm
content: Check SDS1104X-E, although it will be more expensive unless there is some promotion. Can be unlocked(hacked) to 200MHz. Siglent SDS1202X-E costs about the same as Rigol but has 2 channels.

author: janoc
author_rank: Super Contributor
timestamp: August 03, 2022, 03:04:59 pm
content: Is that even a contest if they are all for the same price for you?Owon or Hantek are worth considering only if they are significantly cheaper (by 50% or more) than the Rigol - and you can put up with the bugs, poor/nonexistent (i.e. good luck if the thing breaks or a fatal bug is discovered) support.I have the older (non Z) version of the Rigol and it is still a very good scope for the money, despite being quite a few years old now. Even more so if you upgrade the bandwidth to full 100MHz (it is more like 150). The only things that suck are the relatively sluggish UI and the almost unusable FFT, even though the later got some improvements in the later firmware versions.
Rigol DP711 has Output when "OFF" - Page 1
Forum section: electronics / testgear

author: 45Overload
author_rank: Contributor
timestamp: August 03, 2022, 08:48:50 pm
content: I have a small Rigol linear supply, DP711, with a weird problem. There is a soft touch button that enables/disables the output. There is no relay associated with this button. With the unit powered on (AC), you get output voltage as expected when pressing "ON". When the button is pressed again, the light goes off to signify "Off". In the "Off" mode I'm getting slowly rising d.c. voltage output between the + and - terminals. When cold the voltage is about 3 mV, which rises as it warms up to maybe 6 mV. I'm leaving this one to Rigol . I don't see how the switching can be done without a relay.45O

author: thm_w
author_rank: Super Contributor
timestamp: August 03, 2022, 09:20:24 pm
content: This is normal. Its not switching a relay as you say, its switching the output FET regulator, basically just turns it off. There may still be some leakage or voltage stored in capacitors on the output.Short the output with a multimeter and see what current you get. Then measure the voltage with a multimeter as well, if you are giving us the LCD numbers.6mV is higher than I recall seeing but within spec.

author: 45Overload
author_rank: Contributor
timestamp: August 05, 2022, 08:36:45 pm
content: It makes sense that you can't switch this type of circuit completely off without a relay. However, you would be surprised at the kind of circuit gremlins that pop up even at 5 mV! Rigol gave a very incorrect and misleading response about charged capacitors, and told me to measure with another meter. "This is normal" would have been fine.-45O
N2744A Tek - Agilent adapter fix - Page 1
Forum section: electronics / testgear

author: EE-digger
author_rank: Frequent Contributor
timestamp: April 13, 2018, 12:46:16 am
content: I bought two of these at work, new from Keysight, and on an MSO9254A and MSOX3104A, they were flakey as all get out. I cleaned the pogo pins and the mating surfaces to no avail. It seemed like they were too good to be true.Once the probes communicated and setup, I had to be very careful not to move them at all. This became tiring after a while and the adapters went on the shelf.I took another look at them recently and opened them up out of curiosity. What I found in both was that the two flat head screws left and right on the Tek side pcb were loose. This allowed the contact pattern to flop around instead of being coaxially positioned.They are now both solid. I can wiggle and jiggle the adapter or probe without any response. Only wish I had more of them for homeKudos to the Keysight designers for these adapters and the pretty nice list of supported probes. I've used them on P6245, P6249, P6247 successfully.Another plus with these adapters is that some residual noise in our 1103 (internal ac version) was now gone.

author: TheSteve
author_rank: Unknown
timestamp: April 13, 2018, 12:50:14 am
content: Pics of the inside?

author: EE-digger
author_rank: Frequent Contributor
timestamp: April 13, 2018, 12:53:08 am
content: Oops. I'll do that.

author: LaurentR
author_rank: Frequent Contributor
timestamp: August 02, 2022, 08:28:57 pm
content: Reviving this thread (with pictures!) as I hit the exact same issue on an Agilent-branded N2744A where the internal screws were really loose and causing issues with the probe getting flaky or even being recognized or not intermittently, causing the scope to go nuts.Below in order:* T6 screws to open the case.* 2 plastic pins to push in to unlock the other side of the case.* General view.* PCB coax assembly with the 2 PH1 screws that were loose and needed to be tightened.
Wavesurfer WS3054 Firmware - Page 1
Forum section: electronics / testgear

author: houly
author_rank: Contributor
timestamp: August 02, 2022, 09:55:15 am
content: Hello all,I'm looking for the last firmware of the Wavesurfer 3054, there seems to be a problem on the LECROY website I can't access to the firmware file. Does anyone have it and share it ?Thanks for your help

author: tautech
author_rank: Super Contributor
timestamp: August 02, 2022, 10:12:15 am
content: These are a rebadged Siglent SDS3000 however I got to the LeCroy FW download page via a Digikey link.This should be what you seek:https://teledynelecroy.com/support/softwaredownload/documents.aspx?sc=12

author: houly
author_rank: Contributor
timestamp: August 02, 2022, 12:13:21 pm
content: Hello tautech,Thanks for your reply, the problem is that I can't download the file :

author: nctnico
author_rank: Super Contributor
timestamp: August 02, 2022, 04:27:11 pm
content: It looks like you can't download any firmware from Lecroy at this moment for some reason. Contact their support; likely they can help.

author: hpw
author_rank: Frequent Contributor
timestamp: August 02, 2022, 07:20:31 pm
content: As I posted..https://www.eevblog.com/forum/testgear/teledynelecroy-web-logon-blockings-no-download/
hp 6030a damaged capacitors? - Page 1
Forum section: electronics / testgear

author: Fiorenzo
author_rank: Regular Contributor
timestamp: July 04, 2022, 05:28:00 pm
content: I bought an hp6030a power supply (0-200volt 0-17amp).It was set for 120volt line voltage input and someone converted It to 220 voltage mistakingly.The internal switch has been set to 240volts input but there was also a cable near the smoothing capacitors that was left to 120volt option... you can move it to a 240volt tap.I think that this cable puts the capacitors in a series configuration to double the maximum voltage rating that is 200v as stamped on them.So, do you know how this power supply works? Do you think that the capacitors bank could have been damaged?Thank you.

author: Fiorenzo
author_rank: Regular Contributor
timestamp: July 04, 2022, 06:15:47 pm
content: attached is the schematic where is possible to see the 220volt and 120volt tap

author: Fiorenzo
author_rank: Regular Contributor
timestamp: July 04, 2022, 06:21:11 pm
content: also S1 switch was left to 120volt instead of 220volt.see attached schematic

author: Fiorenzo
author_rank: Regular Contributor
timestamp: July 04, 2022, 08:03:47 pm
content: actually i think the configuration is of a bridge rectifier voltage doubler....the 120volt tap doesn't put the capacitors in parallel but instead let the circuit to double the input voltagenow i wonder what damages could have been happened to the power supply....m

author: Performa01
author_rank: Super Contributor
timestamp: July 05, 2022, 01:28:58 pm
content: I think you're on the right track. The capacitors should be fine and the switch S1 is only an inrush current limiter which protects the mains fuse and the rectifier at best. If both of them are still alive, then its incorrect setting quite obviously didn't do any harm.

author: Fiorenzo
author_rank: Regular Contributor
timestamp: August 02, 2022, 04:43:58 pm
content: so, i have checked all the capacitors with a cheap ebay ers meter.the values I read are almost similar 1800uF 0,13ohm ers at 50hz 0,6%vloss.Is this ok or should I read a lower ers for these special purpose capacitors? (1800uF 200volt low ers caps.)thank you
Mustool MDS8207 and MT8206 Scope DMMs review - Page 1
Forum section: electronics / testgear

author: Jiri Bekr
author_rank: Contributor
timestamp: July 31, 2022, 07:49:51 pm
content: Hi,I was asked by many people if I could have a look at budget oscilloscope waveform viewers, sometimes boldly called portable oscilloscopes. As there was so many requests (from my Czech fanbase), I tested them more thoroughly, and decided that english video should be made too.So it coversMustool MT8208andMDS8207Scope multimeters, and also includes these pocket typeDSO138 and Fnirsi 150"scopes".To be more practical, and actually show something, I performed few measurements on reviewed 4 dollar func gen, and also performed measurements on two DC 12V to AC 230V inverters, and one PWM regulator.To make the video complete when it comes to topic, so there are no holes to be covered later, I have also made up 11 scope categories, that are divided by their working principles.As this forum is filled with professionals, I still think you can find it useful, as there is no good quality review on these instruments. Video is therefore divided to >20 chapters, and you are free to click between them, if you want to skip a topic you know everything about.Video thumbnail file is attached to the end of this post, and video link is here:https://youtu.be/0Rh4_7IkozQYou may have seen my previous EEVblog forum post with review of Japanese Hioki multimeters. I will also be reviewing my Fluke 17B+ multimeter pretty soon.Hioki review thread:https://www.eevblog.com/forum/testgear/review-hioki-dt4261-and-dt4256/Any constructive feedback is welcome
Component tester with higher testing voltage? - Page 1
Forum section: electronics / testgear

author: andrejr
author_rank: Contributor
timestamp: July 31, 2022, 07:37:17 pm
content: Everyone loves the Aliexpress / Ebay clones of the Atmega328 based component tester from mikrocontroller.net. They're pretty useful, but mostly test at 5V maximum. This limitation prevents them from testing larger value zeners, higher voltage regulators, MOSFETs with large VGS, etc.Is there a variant that handles these things correctly? I'd like it to cover all the regular stuff, too, like LCR, etc.

author: kripton2035
author_rank: Super Contributor
timestamp: July 31, 2022, 07:51:41 pm
content: I know of this :https://fr.aliexpress.com/item/1005004347430658.htmland this :https://fr.aliexpress.com/item/1005004144368033.htmlor even this :https://fr.aliexpress.com/item/1005004207845129.htmlkind of other testers.I just ordered the first one to see what it can do.

author: janoc
author_rank: Super Contributor
timestamp: July 31, 2022, 08:22:52 pm
content: I have this tester:https://www.aliexpress.com/item/1005002594781480.htmlIt has some dedicated pins in the bottom row of the socket for testing higher voltage zeners, up to 20V.For higher voltage mosfets even the basic tester will likely do as most FETs will have threshold voltage below 5V and will start to conduct at least a little, permitting identifying the part. These testers are good for checking that the part is OK and identifying pinout, relying on the other values it shows like Rds_on or threshold voltage is rather foolish.I don't believe any of these cheap testers can handle voltage regulators. I have two of them and none of them does, they only show unknown or damaged part. However, that would be a bit too much to expect from a tester like this, IMO, especially given the various capacitance/ESR requirements especially LDOs have.
Siemens Probability Meter - Page 1
Forum section: electronics / testgear

author: EEVblog
author_rank: Unknown
timestamp: July 25, 2022, 12:58:30 am
content: Anyone have any idea what this does?https://twitter.com/spotlynx/status/1551277849268682752

author: Ed.Kloonk
author_rank: Super Contributor
timestamp: July 25, 2022, 01:08:03 am
content: Looks suspiciously like a sophisticated bullshit meter to me.Plug the news into it. Off the scale, I'm sure.

author: Someone
author_rank: Super Contributor
timestamp: July 25, 2022, 01:14:39 am
content: Looks like an input and an output on the front panel?

author: xrunner
author_rank: Super Contributor
timestamp: July 25, 2022, 01:17:50 am
content: Does it have something to do with phases of two inputs being measured?

author: EEVblog
author_rank: Unknown
timestamp: July 25, 2022, 03:55:26 am
content: Someone on Twitter said this:QuoteCould be a coherence meter?

author: tszaboo
author_rank: Super Contributor
timestamp: July 25, 2022, 07:44:24 am
content: I'm going to guess, that it's some sort of statistical meter, where you input pulses on the two coax, and it gives you some statistical probability of the process. But the minimum frequency indicated on the front makes me wonder, that it's probably not that.

author: HighVoltage
author_rank: Super Contributor
timestamp: July 25, 2022, 08:49:08 am
content: I would think it measures the phase shift between two signals.Hook it up to a function generator with 2 outputs and play with the phase angle to see how this instrument reacts.

author: georgd
author_rank: Regular Contributor
timestamp: July 25, 2022, 09:32:26 am
content: I bet it's a window comparator. Channels have separated level controls and common delta.https://en.wikipedia.org/wiki/Window_detector

author: switchabl
author_rank: Frequent Contributor
timestamp: July 25, 2022, 02:07:42 pm
content: @georgd Yes, I believe so. It will show the duty cycle of the comparator output, i.e. the percentage of time spent within the window. So if you e.g. fix ΔUREFand vary UREF(with suitable step-size) you will get a histogram. That would be U-mode, I guess it will also have an A-B correlation mode.The output will be on the back. Likely just the "probabilty" as a 0-1V voltage signal or something. Potentially with a switchable low-pass filter (the output knob has a "DC" position and another one that is not visible).Btw has anyone else noticed that the plastic knob for the UBreference voltage is not actually missing? It has just been "misplaced". Where's Wally?

author: AVGresponding
author_rank: Super Contributor
timestamp: July 25, 2022, 04:30:38 pm
content: Quote from: switchabl on July 25, 2022, 02:07:42 pmHiding the evidence that someone has overloaded it!

author: Xandinator
author_rank: Contributor
timestamp: July 30, 2022, 11:17:03 pm
content: I second the vibration analysis approach. In contrast to a scope this will also show nice readings for incommensurable cycles/nonperiodic incidents, e.g. when dealing with a lot of nonlinear stuff. Like fluid dynamics feedback on electromechanical components...
Agilent 34401a Maximum voltage between common and chassis ground - Page 1
Forum section: electronics / testgear

author: MarkKn
author_rank: Contributor
timestamp: July 30, 2022, 04:03:08 pm
content: I work with tube gear that has voltages going up to 600 volts. I am looking at getting an agilent 34401a and after reading the specifications in the manual a couple of times, I can't locate the maximum voltage the unit will tolerate between the common measuring point and chassis ground. The closest thing I can find in the manual is 'Input protection 1000 volts." Does anyone know what that voltage might be? Or maybe the common is tied to ground. Maybe this max voltage spec has a name that I am not aware of. It strikes me as a pretty important thing to know about a meter unless one always has the common lead at ground potential.Currently (pun?) I use a fluke 87v to measure voltages where the common is in the realm of 600 volts--for instance across a series resistor to determine the current passing through. In any case, I have some interest in a34401a as it appears to be beloved and quite accurate.Any help is appreciated.

author: switchabl
author_rank: Frequent Contributor
timestamp: July 30, 2022, 04:11:46 pm
content: On mine it says 500Vpk max.

author: bdunham7
author_rank: Super Contributor
timestamp: July 30, 2022, 04:12:27 pm
content: 500VPK, so not quite what you need.Many bench meters don't have the same voltage capabilities as good handhelds. For example, most won't do 1000VAC.

author: MarkKn
author_rank: Contributor
timestamp: July 30, 2022, 04:25:14 pm
content: Thanks! Here I am looking in the manual and the answer is right on the faceplate. o:While 1000v isolation would be great for me, I don't expect bench meters to be like that. I do want to know the design limits of a device so I don't brick it. I can still use this sort of meter for tube work, and 500 volts covers almost everything except for the power tubes. At the very least, one can measure the voltage on both sides of the resistor and subtract...
Tektronix 353 DMM Manual - Page 1
Forum section: electronics / testgear

author: 8850hp
author_rank: Newbie
timestamp: July 29, 2022, 11:40:10 pm
content: I'm looking for an electronic copy of the manual for a Tektronix 353 DMM. I've looked in the usual locations, Tektronix forums, Artek, Tekwiki, BAMA, KO4BB, internet search, asked at VintageTEK and have yet to find one. Would anyone have a copy?Thanksov
Does Sencore LC Meters test capacitors (for C/ESR) under voltage or at 0V bias? - Page 1
Forum section: electronics / testgear

author: yus
author_rank: Contributor
timestamp: July 27, 2022, 02:24:39 pm
content: I consider buying SENCORE LC75 as do not want to sped extra money for their automated versions lc102, lc103.From what I can find in the manuals it looks like SENCORE-s from LC75 to lc103 :* test for C/ESR at 0 V bias* test for leakage current at a given V bias.In other words the bias voltage is only applied when testing for leakage and not for C/ESR.Is this correct ? Can somebody who has SENCORE LC meter answer please ?

author: commongrounder
author_rank: Frequent Contributor
timestamp: July 29, 2022, 02:35:43 pm
content: I own a LC102, and formerly owned a LC73. Your conclusions are correct. The selected bias voltage is only applied during the actual leakage test, and is immediately discharged upon release of the test button. Value and ESR tests are performed with proprietary low amplitude waveforms.
Test bench setup USB connectivity issues with USB hubs  - Page 1
Forum section: electronics / testgear

author: smoothVTer
author_rank: Regular Contributor
timestamp: July 28, 2022, 08:34:51 pm
content: In our lab, I have a test bench with 10 instruments connected to a USB 3.0 hub which goes into a Windows 10 lab PC. The VISA driver lib for everything runs on the "Keysight IO Libraries" with the included "Keysight Connection Expert 2022" software. I typically run test suites scripted together with python, and it works 95% of the time with being able to communicate with all instruments on this 10-port USB hub. Occasionally one or more of the instruments ceases communication. It appears X'd out in the Keysight Connection Expert. Typically the instrument will not communicate again until I power it down, then power it back it, then restart windows, and then unplug the entire hub in the newly-booted PC and then replug the hub into the PC. Half the time Windows issues the warning: "USB Device Not Recognized" on one of more of the DMMs ( usually this trouble instrument is a 34461A), and I have to run the entire sequence again until, by some miracle magic, coms are restored again on all instruments.Instruments are 2000's era Keysight DMMs, scopes, R&S power supplies; some older equipment from 1990's is still in use from Agilent, Tektronix etc.I've tried looking up forums for the manufacturers for USB coms issues, but quickly descend into googling-hell with half answers that go nowhere, or answers that are first seem plausible but then discover the issue is something else completely. Trying to contact the manufacturers for advice is likewise an effort in futility, as there seem to be too many variables to get sensible answers. I am also no guru in debugging USB protocols and anything windows related.-- Does anyone else on here have experience controlling 10+ USB instruments using the Keysight IO libraries and has solved problems like I describe above?-- Anybody have a brand of USB hub that perhaps are made specifically for this purpose: Controlling many lab instruments at once? I've googled hubs for this purpose, but I am looking for anecdotes in real-usage scenarios from any of you.-- Anybody have an opinion on USB3.0 vs USB2.x hubs for these purposes? Could somehow a USB3.0 hub be "too fast" for some of these older instruments?-- Any other advice or anecdotes on USB control of 10+ instruments would be beneficial.Thanks all!
ZHIYU 60w Load - over temperature? - Page 1
Forum section: electronics / testgear

author: Aragorn_84
author_rank: Newbie
timestamp: July 25, 2022, 10:39:13 am
content: Hi folks,A while back i bought one of the ubiquitous aliexpress/ebay "60w electronic loads", i believe going under the ZHIYU brand.I've not used it much, until now mostly for testing 18650's and so running at fairly low power.However i'm having a clear out/tidy up and decided to load test a bunch of 12v leisure batteries that i've got stashed in the shed. I know some of them are pretty knackered, so i figured i'd fully charge them all, capacity test them and keep the good ones and get shot of the junk.Set up the load tester and almost immediately ran into thermal issues. Initially i started at full power, 5A, 11v cutoff in "FUN2" mode. It auto-limited itself to about 4.65A due to the battery voltage, which was fine. Except it only ran for about 2-3 minutes then shut down with "Otp" on the display.Cranked it down to 3A and tried again, same thing, just took a bit longer. Maybe 10 minutes.Took it down to 2A and it finally worked and got thru a load test on a fully charged 60AH battery. Ofcourse at 2A this takes quite a while.I've checked some reviews of this unit and none seem to mention such poor thermals. Has anyone experienced this? Is it potentially a fault? Maybe i can modify it with a much larger heatsink?Any advice greatly appreciated.

author: tunk
author_rank: Super Contributor
timestamp: July 25, 2022, 12:30:08 pm
content: Does the fan turn on?Faulty or wrong temp sensor?

author: Aragorn_84
author_rank: Newbie
timestamp: July 27, 2022, 01:01:12 pm
content: Yep the fan runs, and cranks itself up in RPM when the load is applied.I guess i need to check the temperature of the MOSFET and see if its a temp sensor issue or if it really is hitting 100c.
Serial data generator tool for Siglent SDG1000X/2000X/6000X AWGs - Page 1
Forum section: electronics / testgear

author: Hexley
author_rank: Regular Contributor
timestamp: July 24, 2022, 10:45:09 pm
content: I recently needed to create serial data strings in order to test a system, and did not want to dedicate a PC for the purpose. So I used the TrueArb function of my Siglent SDG1000X AWG to generate the serial data as a set of waveform points in the ARB memory.This was done with a Python script that reads an input text file, expands each character into the proper bit sequence, then uploads the result to the AWG. The script can handle the usual serial parameters: baud rate, data length, parity, and stop bit count. It also can generate either a logic signal (swings from a positive voltage to ground and idles high), or an "EIA" signal (swings from a negative to a positive voltage and idles low).The scope image attached shows the AWG delivering logic level data at 19200,8,N,1 from channel 1 (upper trace), and EIA level data at 9600,8,N,1 from channel 2 (lower trace). The scope is decoding the EIA data, just to confirm that things work as expected.The script is named psag1.py. If invoked with no parameters, it returns this prompt:usage: psag1.py [-h] [--name NAME_WAVE_FILE] [--chan CHANNEL] [--output OUTPUTFILE] [--baud BAUD] [--len CHR_LEN][--par CHR_PARITY] [--stop CHR_STOP] [--mode MODE] [--vmax VMAX]inputfileThe trace at the top of the scope photo was generated by the command below, where "foo1.txt" is the 5-character input file. Note that many parameters are not specified, as their default values are used.py psag1.py --chan 1 --name wave1 --mode TTL --baud 19200 foo1.txtConverting 5 characters into 5.000V TTL serial format: 19200,8,NONE,1Data conversion complete. Results stored in ./awg.dat.Sent to AWG as wave1 on channel C1.Script complete.This version of the script uses a hard-coded IP address for the AWG, and it does not do any error checking on file names. There are a few other things that could be improved if anyone feels motivated, but it works well enough for my present purposes.Although it has only been tested with an SDG1000X, it should run on the family mates SDG2000X and SDG6000X.I hope others find this as useful as I have.

author: bicycleguy
author_rank: Frequent Contributor
timestamp: July 25, 2022, 12:44:27 am
content: Nice,had to add '@py' into line 28 as below or crashed python3 with 'Abort trap: 6'rm = pyvisa.ResourceManager('@py')Iv'e had this happen before and is really hard to debug because python crashes. That and IP address were only changes. Don't know why yours runs ok?thanks

author: Hexley
author_rank: Regular Contributor
timestamp: July 26, 2022, 06:18:37 pm
content: Quote from: bicycleguy on July 25, 2022, 12:44:27 amGlad you got things working.Which model of SDG are you using, btw?

author: bicycleguy
author_rank: Frequent Contributor
timestamp: July 26, 2022, 08:48:21 pm
content: SDG2042x and python 3.10.5 with pyvisa 1.12 on a Mac with 10.15.7
HP/Agilent 6632B Calibration, "Wrong Mode" error???.... - Page 1
Forum section: electronics / testgear

author: Smokey
author_rank: Super Contributor
timestamp: July 25, 2022, 02:42:14 am
content: Been on a bit of a test equipment buying spree recently...Picked up an HP branded 6632B.Users Guide =http://ridl.cfd.rit.edu/products/manuals/Agilent/power%20supplies/CD1/Model/66332usr.pdfService Manual =http://ridl.cfd.rit.edu/products/manuals/Agilent/power%20supplies/CD1/Service/66332Aser.pdfIt mostly works, but the cal is a bit out for the "high range" current measurement. At around 100mA there is about a +3.2mA offset on the display vs what it's actually outputting. This is reflected when it's in constant current mode as the output current is still about 3.2mA high with a 100mA output (externally confirmed to be 100mA).I have already opened up the unit and set the switches to reset the cal password, so that's good to go.I can also successfully complete some sections like the "Voltage programming and measurement calibration", "Overvoltage protection Calibration", and P1 of "Current Programming and High-Range Measurement Calibration", but others fail....there are some tests like the "Current Programming and High-Range Measurement Calibration" P2 that gives an error on the display:"WRONG MODE"Neither of the manuals say anything about a "WRONG MODE" error (that I saw at least).What's the deal here? Anyone know what "WRONG MODE" means and how to get around it to finish the cal procedures?

author: Smokey
author_rank: Super Contributor
timestamp: July 25, 2022, 03:51:29 am
content: Oh. I'm using the wrong value current sense resistor."WRONG MODE" is a terrible error message for that.

author: Smokey
author_rank: Super Contributor
timestamp: July 25, 2022, 06:11:14 am
content: So what was going on was that because my sense resistor was too big, the supply was in constant voltage mode instead of constant current mode. It wants over 4A of constant current on the P2 calibration stage and it couldn't get it with the resistor I had on there and the 20V output maximum.
Uni-T UT210E Pro  mods, hack - Page 1
Forum section: electronics / testgear

author: EinHexenMeister
author_rank: Newbie
timestamp: July 24, 2022, 11:42:02 pm
content: I got a new Uni-T UT210E Pro, the one with the gray clamp, not the old org one with the red clamp and I could not find anything regarding the compatibility of the regular mods or hack on this new "Pro" version.The only difference really seems to be that in the V modes there is a Hz frequency mode added to it.This Hz mode seems to be different to the one mentioned in some mode list tables on the long chinese datasheet.I implemented all suggested changes in the UT610E so far, as I did on my old UT610E and all works. Even I have 4 V-modes on my old one (after being modded) DC, AC, DC mV and AC mV the same applies after modding in the Pro version, except the 4 V-modes now have a Hz mode added automatically after each AC selection ... in summary now 6 V-modes with 4 entries in the 8E, 9E, AE and BE fields.Also please note that the EEprom is a 24C08 (as compared to some docs I found related to the hacks, stating it as a 24C02) and has some entries in the 2nd 256 byte block, so please be careful by updating the EEprom.This serves as an add on to all the other modding and hacking instructions for the UT210E on the net
DL24P Calibration - Page 1
Forum section: electronics / testgear

author: SpottedDick
author_rank: Regular Contributor
timestamp: July 25, 2022, 09:59:18 am
content: Hi All,I know we have the "cheezball load" thread, but that's gotten quite long and I want to focus on calibrating the unit anyway.The issue I have is that I blew the MCU up and had to get replacement ICs from Atorch. The replacement ICs have obviously no factory calibration on them, so I had to do this myself.1. Voltage.This one seems like it should be easy. When you go into the menu, it has an option for a 30V calibration point. So I connected 30V to the voltage in pin, selected the option and presto! 30V shows perfectly. The problem? The lower end (where I will be mostly using the unit, like 4.2V 18650s) is WAY off when I do this. Yes, I did connect no load to the unit and do the 0 option as well. However, for example a 4.2V battery shows as 3.5V! What am I doing wrong here? Yes the unit is 4 way wired correctly and the voltage measured at the input pins is accurate, but the display is not.(EDIT: I may have figured this one out, but blew my 30V voltage source, so I can't verify it just now. I'll update when I get the 30V supply working again if my theory is correct).2. CurrentThis is completely alluding me. So like the voltage calibration option, it has a current calibration point of 3.0A. You'd imagine I'd just need to select this option when I have a 3A load connected and the job would be done, the problem? You can't get into the calibration menu when the load is on! Anyone know how this would be calibrated in the factory? It's only out by 50mA, but I'd still like it to be accurate.Any replies appreciated. Thanks!
Advantest R9211 Service Manual  - Page 1
Forum section: electronics / testgear

author: Yeson
author_rank: Newbie
timestamp: July 21, 2022, 02:16:07 am
content: Do you have Advantest R9211 Service Manual ? My equipment have problem.Self Test show 002a code

author: Yeson
author_rank: Newbie
timestamp: July 21, 2022, 02:20:02 am
content: The other problem is SG （signal generator）It have 15.75Khz -80dbV jamming signal when the signal generator is not open.

author: picburner
author_rank: Frequent Contributor
timestamp: July 21, 2022, 02:50:12 am
content: 15.75KHz? Perhaps it captures the CRT's horizontal frequency?

author: Yeson
author_rank: Newbie
timestamp: July 22, 2022, 02:25:19 am
content: Thanks you reply. But there is no 15.75khz signal when RF input is not connected with SG out.