hybridfree/eevblog-posts huggingface dataset:
Bluetooth DMM power consumptions - Page 1
Forum section: electronics / testgear

author: shakalnokturn
author_rank: Super Contributor
timestamp: November 04, 2019, 12:36:35 pm
content: Referring back to my own topic that I may revive some day:https://www.eevblog.com/forum/testgear/your-experienceopinion-adding-bluetooth-to-handheld-meters/Whoever owns a BT equipped DMM or has documentation with the figures, I'm looking for power requirements of existing BT meters when BT is being used.A comparison of power requirement with BT on vs. BT off would be even better of course.

author: shakalnokturn
author_rank: Super Contributor
timestamp: November 30, 2019, 02:16:25 pm
content: After searching around some time, no manufacturers actually give figures in terms of power, some state usage times with BT enabled.In the end it always works-out to be in the 25-35mW ballpark.

author: threephase
author_rank: Regular Contributor
timestamp: November 30, 2019, 05:42:50 pm
content: Table of the three insulation testers that I have reviewed that have a bluetooth connections. The initial measurement was just of 230V AC and then the second was the same measurement with the bluetooth enabled exporting the data to an iPad.Kind regards.

author: shakalnokturn
author_rank: Super Contributor
timestamp: December 23, 2019, 11:27:21 pm
content: Thanks for your measurements threephase.The Chauvin Arnoux is just what I expected.I'm impressed by the differences between the Flir an Fluke meters though!Is the Fluke a BLE device? (I have had a quick search for that detail, all that popped-up was that it uses the 2.4GHz ISM band.)

author: threephase
author_rank: Regular Contributor
timestamp: December 24, 2019, 09:45:10 am
content: You are welcome shakalnoturn.Yes it looks like the Fluke has a BLE device installed, attached are a zoomed in picture from the teardown and what I believe to be the manual.Kind regards
Question about autoranging and manual ranging clamp meter - Page 1
Forum section: electronics / testgear

author: channellxbob
author_rank: Newbie
timestamp: December 22, 2019, 08:36:13 pm
content: I'm looking at some clamp meters that will be used for HVAC and noticed a strange error in one of the meters. The meters include the following.Amprobe ACD-51-NAVAmprobe ACD-14-PROKlein CL450Fieldpiece SC440All of the meters, except the ACD-14-PRO, allow for manual ranging.When checking DCV with the ACD-51-NAV, it has three viable settings, AutoSense autoranging which detects and chooses between AC or DC, DC only autoranging, or manual range DC.If I measure a ~9V battery, (or any DCV source), the readings are wonkyAutoSense picks correctly and reads 8.43DCDC autoranging also correctly reads 8.43DCManual ranging to one decimal place reads 8.2VDCAll of the other meters that allow manual ranging, read correctly down to the single decimal place and read 8.43, 8.4 respectively.What is the ACD-51 doing in manual range that always delivers the wrong DC voltage?

author: gby
author_rank: Frequent Contributor
timestamp: December 23, 2019, 05:13:50 pm
content: As a guess maybe ACD-51-NAV manual range uses lo-z loading while the other modes are high impedance? Theory is the 9V battery voltage actually drops lower with lo-z load. You could check this theory with a second meter also on the battery and when switching the ACD-51-NAV into manual see if the voltage on the other meter also changes.

author: channellxbob
author_rank: Newbie
timestamp: December 23, 2019, 06:48:21 pm
content: I've read the manual and specs, and the plus 2 lsd, on accuracy, is one probable cause, but wouldn't you think it would still match the higher resolution reading like all my other meters?
Tenma "handheld" PSU - Page 1
Forum section: electronics / testgear

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: May 10, 2019, 04:36:18 am
content: Lack of earth is a bit of a concern - output will probably have a lot of common-mode AC noise on it.

author: ataradov
author_rank: Super Contributor
timestamp: May 10, 2019, 04:46:51 am
content: Note that this thing has -0.6V on the output when the output is "Off". Or at least TekPower branded unit does.

author: Scratch.HTF
author_rank: Regular Contributor
timestamp: May 11, 2019, 01:17:23 am
content: This model is also marketed under Jaycar cat. MP3844.

author: oPossum
author_rank: Super Contributor
timestamp: May 11, 2019, 03:30:03 am
content: Quote from: ataradov on May 10, 2019, 04:46:51 amThe video shows that and has a fix for it.

author: ataradov
author_rank: Super Contributor
timestamp: May 11, 2019, 06:51:52 am
content: Quote from: oPossum on May 11, 2019, 03:30:03 amThanks for pointing that out. I've applied the fix to my unit and it worked.

author: NoisyBoy
author_rank: Frequent Contributor
timestamp: May 11, 2019, 11:29:58 am
content: I like the portability, but for that price, we shouldn’t have to “fix” a brand new proud to correct a design defect and void our warranty on our own expense.I’d wait for a different product.

author: ataradov
author_rank: Super Contributor
timestamp: May 11, 2019, 05:34:36 pm
content: Quote from: NoisyBoy on May 11, 2019, 11:29:58 amI agree. It also has very counter-intuitive UI. I feel like they've got a good version 1 product. But I doubt they will ever follow up on that.

author: ataradov
author_rank: Super Contributor
timestamp: December 01, 2019, 02:44:04 am
content: Just an update on the "fix". I was using this supply with the fix applied in short bursts with low voltages and it was fine. Today I need 15 V and a very little current (basically open). Well, after ~20 minutes I smelled a typical burnt electronics smell. The disassembly of the unit shows that those resistors are burned up.So the fix does not seem to be very robust.

author: screwbreaker
author_rank: Regular Contributor
timestamp: December 29, 2019, 12:36:27 pm
content: Quote from: ataradov on December 01, 2019, 02:44:04 amThanks for reporting this.I've just removed the transistor, to get rid off the -0.6V from the output.I don't care about the discharge time of the capacitors, I don't intend to use it as a precision bench PSU.By the way my unit was full of this little residual solder balls. Probably the wrong amount of solder paste or, the wrong temperature is used during the production assembly.With an on/off switch this will be a very nice portable unit.
EXtech EX830 - calibration procedure - Page 1
Forum section: electronics / testgear

author: tony359
author_rank: Frequent Contributor
timestamp: November 24, 2019, 11:45:25 am
content: Hello all,I am looking for a service manual for the EX830 clamp meter or an extract with the calibration procedure, temperature in particular. Can anybody help me please?Thanks!Tony

author: threephase
author_rank: Regular Contributor
timestamp: November 24, 2019, 01:23:23 pm
content: I don't have the procedure for that particular meter, but in the past I have emailed support@extech.com with the model and serial numbers of the meter and they have supplied one within a couple of days. The answer to this is still on their FAQ page, so should still work.http://www.extech.com/display/?id=13759Kind regards.

author: tony359
author_rank: Frequent Contributor
timestamp: November 24, 2019, 01:36:05 pm
content: Fantastic, I sent them an email!Thanks so much for your help!Edit: the mail is "deactivated and unattended!"I'll follow the FLIR link they sent me.

author: tony359
author_rank: Frequent Contributor
timestamp: December 22, 2019, 05:50:31 pm
content: Hi allFlir sent me the manual, I am attaching it here! Thanks for your help!
Looking for photos of the logic pod for a Philips PM 3542/43 - Page 1
Forum section: electronics / testgear

author: gkmaia
author_rank: Frequent Contributor
timestamp: December 22, 2019, 03:35:42 am
content: I recently bought a Philips PM 3543 and it did not come with the logic pods.Wondering if anyone here have one at hand and could send me some photos of it?Or know about some possible replacements of another brand.
What oscilloscope to get? ( Budget ~900CAD) - Page 1
Forum section: electronics / testgear

author: villamix
author_rank: Newbie
timestamp: December 08, 2019, 10:11:05 pm
content: Hey Guys,I have been finding this forums to be invaluable so far, and i am in the process of setting up an electronics lab.Looking to pull the trigger on a new oscilloscope and narrowed down the choices to the Keysight 1000x series. I am having a hardtime choosing a scope betweenthe DSOX1102A vs DSOX1102G. From what i can tell the 1102G has a built in function generator and a frequency response analyzer. Is this worth the extra $270,(DSOX1102A - $870 CAD vs DSOX1102G - $1136). Or is there a better scope for this budget, i want to stick to keysight as their stuff is good quality and should last a long time with good service and support.Regards,Raj

author: nctnico
author_rank: Super Contributor
timestamp: December 08, 2019, 10:34:26 pm
content: If you are fixated on getting an A-brand then look at what R&S has to offer. Like the RTC1000 series. At least these have a lot more memory.

author: Fungus
author_rank: Super Contributor
timestamp: December 09, 2019, 07:36:11 am
content: Quote from: villamix on December 08, 2019, 10:11:05 pmOnlyyoucan answer that...It depends entirely on what sort of "electronics" you're planning on doing.Edit:eg. Having the signal generator inside the 'scope lets you plot frequency response graphs on screen so it's definitely worth it if you're doing audio work.

author: Keysight DanielBogdanoff
author_rank: Unknown
timestamp: December 09, 2019, 07:57:27 am
content: They're both great options, the G is definitely worth it in my opinion if you're going to use the frequency response analyzer. The function generator is nice and convenient, especially if you are cramped for desk space, but the frequency response is the really valuable part if you need/want it. Otherwise, you can find/build some comparable generator options at a more budget friendly price. Just my $.02 (disclaimer, I work for Keysight).edit: and yes, the only real difference in the G models is the function generator and FRA, the rest is the same.

author: Gandalf_Sr
author_rank: Super Contributor
timestamp: December 09, 2019, 11:17:09 am
content: The Rigol MSO5074 seems to fit your needs. Some optional features are being offered for free in several places and there's information on these forums to unlock everything including 350 MHz bandwidth. There's also a 2 channel AWG built in.There's a Keysight store on eBay where you can get some great deals if you want to go the Keysight route.FYI, I have no affiliation with KS or Rigol but I own scopes made by both companies.

author: PhilB
author_rank: Contributor
timestamp: December 21, 2019, 11:11:28 pm
content: I just went through this and researched for many weeks, on this site and others.I ended up getting the DSOX1204G. It was a bit more than the DSOX1102G, but I figured it was worth it for two main reasons:4 Channels. No need for it yet, but could come in handy.Ability to upgrade bandwidth later if needed.As far as I can tell, the DSOX1102G is limited to 100MHz, whereas the DSOX1204G has options up to 200MHz.
What audio power meter actually do? - Page 1
Forum section: electronics / testgear

author: 001
author_rank: Super Contributor
timestamp: October 14, 2019, 12:35:45 pm
content: What audio power meter actually do?It looks like simple uA-meter graduated in watts+diode bridge+8ohm power resistorfor $$$$$$$$$$$But WHY anybody need one instead voltmeter across dummy load?UPD Ohhhhhhhh I found some info. See below

author: Gyro
author_rank: Super Contributor
timestamp: October 14, 2019, 12:47:22 pm
content: I'm not sure that Audio power meters are a common thing?There are certainly power meters, many of these have frequency capability extending into the audio range, but they measure both current and voltage and correct for power factor to give true power. They don't include dummy loads.VU meters just measure signal level with defined attack and decay characteristics (the proper ones anyway) but work at signal level. Likewise Audio voltmeters, which have flat response across (at least) the audio frequency range. In the '70s, many amps had 'power meters' which just used voltage to give a rough and inaccurate indication of power, based on nominal speaker load impedance.Any examples you can point to?Measuring voltage with a meter and bridge rectifier is fine (once you get past the diode forward voltage 'dead-zone' non-linearity)as longas you're doing sinewave testing. Once you start using other waveforms or the amplifier starts to clip then all bets are off! You need true rms then (won't help with the clipping example, as you're no longer outputting a usable signal).

author: 001
author_rank: Super Contributor
timestamp: October 14, 2019, 01:31:04 pm
content: Quote from: Gyro on October 14, 2019, 12:47:22 pmIt still in the gamefor $100http://zerocapcable.com/?page_id=221

author: 001
author_rank: Super Contributor
timestamp: October 14, 2019, 01:33:33 pm
content: And somebody has built his ownhttp://www.chambonino.com/construct/const3.htmlBut why? No THD control = silly power measurments

author: Gyro
author_rank: Super Contributor
timestamp: October 14, 2019, 04:15:02 pm
content: Well the first one you listed incorporates an over-power trip and is used in actively running high power PA rigs. It seems reasonably priced.The second (home built) one is doing True RMS power measurement. It's basically doing just what you suggested in your OP, just with RMS measurement. [EDIT: It's mostly a convenient dummy load, maybe he tests a lot of amplifiers.]

author: 001
author_rank: Super Contributor
timestamp: October 15, 2019, 11:35:05 am
content: I googled for some mysterious infoThe "problem" of audiometer users is small dynamic scaleThe solution is analog square compression for needle meters like ba6138 chipAnybody here can say something about this "technology"?

author: 001
author_rank: Super Contributor
timestamp: December 21, 2019, 04:07:47 pm
content: Quote from: 001 on October 15, 2019, 11:35:05 amNo opinions yet?
New Uni-T UT123T vs UT123 - Page 1
Forum section: electronics / testgear

author: 001
author_rank: Super Contributor
timestamp: December 15, 2019, 10:38:26 am
content: HiIt is so cute. Two color indicator for continuity test! Voltage and resistanse is all I basically need.But what the difference UT123T vs UT123?Manual says what resistance mode may be damaged with voltage above 30V. Why?https://www.uni-trend.com/html/product/General_Meters/Digital_Multimeters/UT123/

author: 001
author_rank: Super Contributor
timestamp: December 17, 2019, 08:16:00 pm
content: No opinions?

author: qft1967
author_rank: Contributor
timestamp: December 17, 2019, 08:25:02 pm
content: The only difference that I could see is that the T model is ROHS and CE certified (or rather declared to be confirmitive).

author: DarrenWalker
author_rank: Newbie
timestamp: December 17, 2019, 11:32:26 pm
content: I reviewed this multimeter awhile back, it's a solid piece of gear.https://youtu.be/s8mRZVx4m6kThat being said, I have never seen a UNI-T UT123TWhere did you see this?

author: 001
author_rank: Super Contributor
timestamp: December 18, 2019, 12:32:43 pm
content: Quote from: DarrenWalker on December 17, 2019, 11:32:26 pmCheck UNI-T website. Both looks the sameWhat about Your experience with this meter? Can it be damaged with AC at resistance mode?

author: 001
author_rank: Super Contributor
timestamp: December 21, 2019, 03:58:28 pm
content: Quote from: DarrenWalker on December 17, 2019, 11:32:26 pmHiIs it True RMS?
Rohde & Schwarz FSEM20 FFT B5 option - Page 1
Forum section: electronics / testgear

author: hafrse
author_rank: Regular Contributor
timestamp: December 21, 2019, 12:59:25 pm
content: Hello,Is it possible to retrofit the FFT B5 option on a FSEM20 by taking the board from a fsea30 "parts unit" or I need a license key for that HW option?Thanks in advance for any input
HITACHI V 550B 50MHz oscilloscope, is it good ? - Page 1
Forum section: electronics / testgear

author: ElFatih535
author_rank: Newbie
timestamp: December 18, 2019, 04:49:01 pm
content: HelloI found this used analog oscilloscope, it's 80USD when converted with no probes, I live in a small country so there are not many used oscilloscopes for sale. I can either buy this or one of those PC oscilloscopes under 100$.This is the manual for it:https://www.manualslib.com/manual/1164580/Hitachi-V-550-B.html#manualI am planning on making and designing crude simple electronic devices like DC converters,different kind of audio amps, Switch mode psus and other similar stuff from scratch, just for learning how each component works ,how to read and design more complex circuits and all that, so I need an oscilloscope for troubleshooting mostly.Is this a good oscilloscope, is it good for my needs especially because it is analog, what is with the many temperature warnings ?Also I'm unfamiliar with oscilloscopes so any tips would be welcome.Thanks

author: tautech
author_rank: Super Contributor
timestamp: December 18, 2019, 07:30:22 pm
content: Welcome to the forum.Any scope is great when you haven't had one before and it opens up the otherwise invisible world of waveforms for us.Hitachi made good sound scopes but like many CRO's they have a good bit of age on them so reliability could be an issue. For probes, any of the cheap P6100 probes on eBay or Aliexpress would be fine to pair with it.Until you have some scope experience a stand alone is a good idea rather than risking whatever PC or laptop you might connect a USB scope to although they have the advantage of capturing waveforms easily so you can come to the forum with screenshots and questions of something you don't understand.

author: ElFatih535
author_rank: Newbie
timestamp: December 19, 2019, 04:28:31 pm
content: Oh ok thanks a lot.

author: AVGresponding
author_rank: Super Contributor
timestamp: December 19, 2019, 04:54:28 pm
content: Also you need to bevery carefulwhen testing smps's with a scope.If they are AC line powered especially, this is best not done until you have some experience under your belt.It's not unusual for people to give all kinds of advice for "safe" probing of such devices. It's all useful, but the most important thing to remember is that devices that are connected to the mains AC, or that generate high internal voltages, arenever safe, and should be treated with caution and respect, always.

author: ElFatih535
author_rank: Newbie
timestamp: December 21, 2019, 10:50:40 am
content: Ok ok , I'll leave smps for sometimes later then , thanks for the advice.
Rigol DS1104Z , self calibration menu not availible - Page 1
Forum section: electronics / testgear

author: newbadboy
author_rank: Regular Contributor
timestamp: December 19, 2019, 09:42:07 am
content: I updated my scope with latest FW and the last thing the PDF instruction manual said was to restart the scope and run the self calibration found under the utility menu.But under utility self cal is not present, i cannot remember that i have done self cal before so i cannot say if it has ever been present.What to do?

author: tv84
author_rank: Super Contributor
timestamp: December 19, 2019, 01:48:38 pm
content: Attached.

author: JohnPen
author_rank: Regular Contributor
timestamp: December 19, 2019, 02:14:20 pm
content: It should be present in normal circumstances.Select UtilityPress down arrow button on right side of screenTop right menu item should show Self CalSelect Self CalSelect StartWait a few minutes to finish.

author: MarkF
author_rank: Super Contributor
timestamp: December 19, 2019, 02:29:25 pm
content: Press Utility menuPress Page Down buttonStart Self-cal. (Insure scope has been powered 'ON' for 20 minutes or so.)

author: newbadboy
author_rank: Regular Contributor
timestamp: December 20, 2019, 07:29:39 am
content: Thx. ill check tonight.

author: newbadboy
author_rank: Regular Contributor
timestamp: December 20, 2019, 08:04:15 pm
content: Yup found itRunning the cal as we speak!!THX
Kontron DMM type 4021 - Page 1
Forum section: electronics / testgear

author: vu2615
author_rank: Newbie
timestamp: December 20, 2019, 09:21:13 pm
content: Can someone help me? I need a servicemanual or just the electronic schematic of a digital multimeter Kontron 4021, but it is hard to find. Tabor 4021 is the same as the Kontron 4021.In advance, thanks a lot if you will share it with me.Everhard GoosGermany
Keithley DD-51 / DD-52 VFD - Page 1
Forum section: electronics / testgear

author: TRN
author_rank: Unknown
timestamp: December 20, 2019, 11:52:30 am
content: I know that the Keithley DD-51 / DD-52 VFD displays are custom manufactured items for the Keithley 200X DMM's,but has anybody ever been able to get his hands on the datasheet of one of this displays?
TTI TG251xA Series vs Rigol DG81x & Siglent SDG8xx  - Page 1
Forum section: electronics / testgear

author: TheBay
author_rank: Unknown
timestamp: December 20, 2019, 10:15:48 am
content: I'm looking for a new function generator, does anyone have any experience with the TTI TG251xA range?I am torn between these and the Rigol DG81x series (Modified to higher versions) and also the Siglent SDG8xx.I can't find much in the way of reviews or user experience on the TTI TG251xA range.All things being equal, all the models I've mentioned will be in the exact same price range for me at the moment.Uses will range from general function generator uses to audio and ham radio.I've gone through the spec sheets and on paper they are all very similar.

author: tautech
author_rank: Super Contributor
timestamp: December 20, 2019, 10:40:25 am
content: Don't get the SDG800, get a SDG1032X instead. Both 14 bit but the 1032X has 2 channels and a heap more features. SDG2042X is another step up with 16 bit but a good few more $.

author: TheBay
author_rank: Unknown
timestamp: December 20, 2019, 10:44:27 am
content: Quote from: tautech on December 20, 2019, 10:40:25 amThe SDG1032X seems to be approx £180 - £150 more than the others which is a fair jump in price, looks very nice though.*EDIT* I've found the SDG1032X for £310 which is only about £50 - £70 more than the others, can this be "upgraded" to a higher MHz model?

author: tautech
author_rank: Super Contributor
timestamp: December 20, 2019, 10:58:06 am
content: I keep a couple of SDG810's in stock and they just don't sell.You might have noticed SDG805 is now discontinued and I wouldn't be at all surprised if the rest of the SDG800 range will be too......something to consider......not that I have any inside knowledge on this matter.OTOH SDG1032X always sells and again I'm cleaned out of them.SDG2042X sell to those that want/need the better signal purity 16 bit provides.My first decent AWG was a SDG1010, similar spec to SDG810 but 2 channels and they've also been discontinued on favor of the later X models.Your $ your choice so just gather the facts and good luck with your selection.

author: tautech
author_rank: Super Contributor
timestamp: December 20, 2019, 10:58:55 am
content: Quote from: TheBay on December 20, 2019, 10:44:27 amApparently.

author: TheBay
author_rank: Unknown
timestamp: December 20, 2019, 11:03:14 am
content: Thank you for that info, that's the SDG8xx series ruled out.Seriously considering the SDG1032X, but need to know a bit more about the TTI TG251xA series but info is thin on the ground, I can get one for much much less than the RRP and less than the SDG1032X

author: tautech
author_rank: Super Contributor
timestamp: December 20, 2019, 11:19:41 am
content: The specs look quite similar except the TTI hasn't got a frequency counter or the bigger color display.https://www.siglenteu.com/download/2412/http://www.saelig.com/supplier/tti/gen-tgxa-11pa.pdf

author: TheBay
author_rank: Unknown
timestamp: December 20, 2019, 11:25:43 am
content: Ah didn't spot the counter on the Siglent, another counter would be very useful.
Rare Tektronix ORS2488/ORS622 SDH/SONET Reference Receiver - Page 1
Forum section: electronics / testgear

author: dagema
author_rank: Contributor
timestamp: December 18, 2019, 12:03:59 pm
content: I recently purchased this discontinued Tektronix SDH/SONET Reference Receiverhttp://w140.com/tekwiki/wiki/ORS2488on Ebay, and have been searching for a user manual. Tektronix support links to nowhere, so I am hoping someone can provide me with access to a user guide, service manual, or anything related.Thanks for any help!
How electrically robust is your oscilloscope? - Page 1
Forum section: electronics / testgear

author: joeqsmith
author_rank: Super Contributor
timestamp: December 21, 2019, 02:25:56 am
content: I was watching some of the videos on VintageTEK Museum's YT channel. The last one was Watch Mr Wizard, where an old man is trying to teach a boy about an oscilloscope. They bring a van de graaff generator next to the scope and the next thing you know, it's dead and the old man is not sure why..https://youtu.be/XhUjD4mBo8k?t=477

author: BravoV
author_rank: Super Contributor
timestamp: December 21, 2019, 02:32:05 am
content: Some people are just never respect this words ... "ABSOLUTE MAXIMUM RATINGS", but see the positive side of this event, as old sayin, you never too old to learn.

author: joeqsmith
author_rank: Super Contributor
timestamp: December 21, 2019, 02:43:00 am
content: If he only had a DSO instead of that camera. I am old enough to have had the pleasure of using one of those.I liked his rubber band scope simulator.

author: David Hess
author_rank: Super Contributor
timestamp: December 21, 2019, 02:51:57 am
content: Not too long ago I read where someone said that for working on tesla coils and similar, they kept a Tektronix 545A with CA amplifier around because it was the best of the last all tube oscilloscopes.

author: maginnovision
author_rank: Super Contributor
timestamp: December 21, 2019, 03:16:47 am
content: I have a kid sleeping on me right now and can't watch the video but that reminds me of a time I accidentally built a van de graaff generator and was very confused why my simulator kept glitching and eventually totally crashing after a few seconds of running. Those things can definitely cause some problems.
Error correlation Rigol MSO5000 - Page 1
Forum section: electronics / testgear

author: Zigortxu
author_rank: Contributor
timestamp: December 18, 2019, 10:09:49 pm
content: I bought recently a rigol MSO5074 and I hacked it for full licenses, but when I measurement the same signal from analog channel 1 of oscilloscope, and D0 channel from digital channel, the signals are different in time, the analog signal has a delay of 140ns. I attach an image of this. Could anybody help me with this?Sorry for my englishBest regardsZigor

author: thm_w
author_rank: Super Contributor
timestamp: December 18, 2019, 11:22:54 pm
content: Yes, discussed here:https://www.eevblog.com/forum/testgear/review-rigol-mso5000-tests-bugs-questions/(22)Nothing to resolve this. The command exists in SCPI protocol, but does not function.You can report to Rigol, maybe they will raise the priority or let you know when it will be fixed.

author: David Hess
author_rank: Super Contributor
timestamp: December 19, 2019, 01:25:16 am
content: Some oscilloscopes have channel and probe delay adjustments.
Where to go for Fluke service/spare parts? - Page 1
Forum section: electronics / testgear

author: unknownparticle
author_rank: Frequent Contributor
timestamp: December 17, 2019, 06:14:30 pm
content: Looking for recommendations for Fluke spare parts suppliers in the UK? I've spoken to a few so called distributors that list Fluke stuff on ebay but they have been about as much use a blown fuse!!

author: andy3055
author_rank: Super Contributor
timestamp: December 17, 2019, 07:12:33 pm
content: What exactly are you looking for?

author: unknownparticle
author_rank: Frequent Contributor
timestamp: December 17, 2019, 07:35:11 pm
content: This is a VT04 visual thermometer, I need the grey moulding at the top of the image.

author: andy3055
author_rank: Super Contributor
timestamp: December 17, 2019, 07:44:36 pm
content: I think that is a very hard part to find. If you have the broken pieces, glue them and make a mold out of it and cast it from a resin. Just an idea. Unless you have access to 3D printing.

author: unknownparticle
author_rank: Frequent Contributor
timestamp: December 17, 2019, 07:56:14 pm
content: It's a current model, why would it be hard to obtain?

author: andy3055
author_rank: Super Contributor
timestamp: December 17, 2019, 11:09:10 pm
content: Just that it is a part that needs replacing very rarely. I guess even a dealer will have to special order it from Fluke as that chances of them stocking is very remote. Making your own is the option I see unless you find a defective unit for cheap somewhere. If it is that new, that chance is also remote.

author: unknownparticle
author_rank: Frequent Contributor
timestamp: December 18, 2019, 03:02:59 pm
content: Ah, I see what you mean, initially I thought you meant it would be difficult to obtain from Fluke! I fully understand that a dealer would need to order it from Fluke but the Fluke dealers I've spoken so far seem to struggle with the concept of a spare part! I was just looking for a recommendation for a competant UK dealer.
Trouble with inductive load on linear bench power supply - Page 1
Forum section: electronics / testgear

author: nx1101
author_rank: Newbie
timestamp: December 17, 2019, 06:05:44 pm
content: Hello, eternal newb here. I am driving a 24V 300mA solenoid with a Rigol DP712 linear power supply (50V 3A) and a flyback diode (1n4001) in reverse in parallel with the load. After several pulses the power supply turns off due to overtemperature protection. The power supply fan is working. Any clues as to what may be happening. Is it normal?

author: andy3055
author_rank: Super Contributor
timestamp: December 17, 2019, 06:17:32 pm
content: Why are you driving a 24 volt load with a 50 volt source?

author: Kleinstein
author_rank: Super Contributor
timestamp: December 17, 2019, 06:29:56 pm
content: The supply should be OK with 300 mA at 24 V.Normally an inductive load should not be a problem with a supply in CV mode. However it can be a problem in for the CC mode. To help regulation one could try adding something like 100 µA and 10 ohms in series in parallel to the load.If the supply oscillates the pre-regulation or transformer tap switching may not work well and thus the power loss could be considerably higher higher than normal.

author: nx1101
author_rank: Newbie
timestamp: December 17, 2019, 06:31:38 pm
content: Quote from: andy3055 on December 17, 2019, 06:17:32 pmSorry I meant to say the power supply maxes out at 50V 3A. I have it set to 24V 500mA.

author: tautech
author_rank: Super Contributor
timestamp: December 17, 2019, 07:01:14 pm
content: Quote from: nx1101 on December 17, 2019, 06:31:38 pmSet the current limiting much higher or don't use CC mode at all.

author: MadTux
author_rank: Frequent Contributor
timestamp: December 17, 2019, 09:34:49 pm
content: 1N4001 is not fast enough and PSU gets inductive spikes when switching off the inductive load?Problems with inductive loads seems like a common issue with cheap PSU and their crap design.My old cheap crap Voltcraft PSU fried it's opamps for like the 3rd time now, mostly by using it to power DC-servos.Got a nice Phillips PSU with better specs now, which doesn't mind any inductive feedback. Voltcraft crap goes to ebay.

author: Kleinstein
author_rank: Super Contributor
timestamp: December 17, 2019, 09:45:52 pm
content: The 1 N4001 is a slow diode, however it can still catch the inductive spike when turning off. A slow diode is slow when going from forward to blocking. The transition from reverse to conduction in forward direction is fast with essentially all diodes ( high voltage PIN diode can be an exception, but even these are not that slow. A slow diode could be a problem when turning on a short time after turn off. So something like PWM control does not work with a slow diode.Modern PSUs can have more problems with inductive loads as modern capacitors are often low ESR. In the old PSUs the natural higher ESR of the output capacitor helps. Ideally it needs some capacitance with some ESR at the output to get good stability. Cheap (and not so cheap) PSUs often lack the ESR.
Global Specialties 2001 Power Supply Questions - Page 1
Forum section: electronics / testgear

author: the_hefty_lefty
author_rank: Newbie
timestamp: December 14, 2019, 06:34:14 pm
content: Hey all! I'm in the process of putting together a test bench setup for audio/music electronics tinkering and I ran into a bit of an issue. While on a little buying spree, I grabbed a Global Specialties 2001 Function Generator but (unsurprisingly) it didn't come with a power cable. While this usually wouldn't be an issue since most of these seem to come with a standard IEC connector and an internal step down transformer, this rev of the 2001 is fitted with a 5-pin DIN connector and no internal step-down circuit for power. I've tried contacting the seller and GS to no avail so I'm hoping someone here can help me out. If anyone owns a similar model and can provide me with the correct power supply to use with the unit or if someone with an IEC-powered version could measure the voltage on the output of the step down circuit, I'd really appreciate it. Thanks in advance for any help!

author: JFJ
author_rank: Regular Contributor
timestamp: December 14, 2019, 09:05:45 pm
content: The schematic on page 20 of the manual (Here) shows the output from the transformer/bridge rectifier to be +17V and -17V. Those voltages are then regulated down to +12, +5 and -12 volts.

author: the_hefty_lefty
author_rank: Newbie
timestamp: December 14, 2019, 09:56:21 pm
content: Awesome! I was hunting around for the schematic but couldn't find it. Thanks for tracking that down! After cracking the unit open and taking a look, it seems like the regulator is still in there so it should run off a +/-17V supply which is proving to be a pain to source. Is it worth trying to track down the right supply or should I just take the loss and grab a different generator?

author: Chris56000
author_rank: Frequent Contributor
timestamp: December 17, 2019, 04:53:04 am
content: Hi!If you're happy with your modification skills, you can probably fit an eBay LM317/LM337 Regulated Power Supply Board Kit inside the case– these can be adjusted to +17V and –17V output, or, remove the original regulator (s) and set the kits to give ±12V output, and then you can bring out three leads to go to the secondary of a 12–0–12V transformer rated at about 15VA or about 1.25A – these kits contain their own rectifier and smoothing capacitors!https://www.ebay.co.uk/sch/i.html?_nkw=lm317+lm+337+kit&_sop=15You can quite safely use the original DIN connector socket to carry 12–0–12V a.c. from a suitable enclosed transformer no problems – a piece of 0.5mm² three core mains cable fitted to a DIN plug can be wired to the transformer's secondary terminals will do!Chris Williams
Schlumberger/Enertec 5027 Oscilloscope – Any Documents? - Page 1
Forum section: electronics / testgear

author: Chris56000
author_rank: Frequent Contributor
timestamp: December 17, 2019, 04:02:40 am
content: Hi!I recently purchased s Schumberger/Enertec 5027 Oscilloscope, it's a 4 channel instrument that seems to be derived from the 5218/5224 series which uses Seven Segment displays to display voltage/time coefficients and other functions, rather than use a marked front panel.I was going to pass it on because of the gaping hole where the "Synchronization" control was, but the seller said he had the missing knob for it, so decided to take the plunge!Do any of our International friends recognise the Enertec 5027 and is there known to be any bookwork/manuals for it anywhere?I can draw out circuits and layouts, but trying to write the adjustment procedures is next to impossible unless there's a similar model I can use as a guide!Chris Williams
TEKTRONIX MSO2024 vs. AGILENT DSO6014A  - Page 1
Forum section: electronics / testgear

author: mike96ca
author_rank: Newbie
timestamp: December 12, 2019, 07:18:48 am
content: Hello all,I apologize for the newbie question. I am still a bit of an amateur in the world of electronics; However I am considering an investment into a good scope instead of a cheap entry level. I feel this will come in handy as I continue to pursue an education in electrical engineering. I have done some searching on each model here on the forum, however I still haven't decided which scope I should get, I am looking at a local used listing for each and from the looks of it they are both roughly the same price. Both are claimed to be working according to the engineering firm who is parting with them and are in good cosmetic shape having had the chance to physically go see them and power them up myself.Anyways, again apologize for the newbie question though I would appreciate some opinions on this specific comparison and let me know what you think would be the better buy. Thanks

author: 2N3055
author_rank: Super Contributor
timestamp: December 12, 2019, 07:39:12 am
content: AGILENT DSO6014A. Without doubt.

author: mike96ca
author_rank: Newbie
timestamp: December 12, 2019, 08:19:33 am
content: Yeah I was kinda leaning towards it. Other than that I actually got off the phone with the company earlier and found out there is even a third scope. Probably a similar comparison but again second opinions are always good. Third scope is a Tektronix TPS2024

author: egonotto
author_rank: Super Contributor
timestamp: December 17, 2019, 12:46:02 am
content: Hello,is that only the scopes or are probes included?Which option are included?For the AGILENT DSO6014A exist probably a hack to get the options.The Tektronix TPS2024 has only 2.5 K points. For me that is a no go.I have an AGILENT DSO6104L and I am very happy with it.But the MSO2024 has 200MHz and the DSO6014A only 100MHz.Best regardsegonotto

author: tautech
author_rank: Super Contributor
timestamp: December 17, 2019, 12:59:49 am
content: Quote from: mike96ca on December 12, 2019, 08:19:33 amAn isolated DSO is a great thing for the novice to have as it negates the risk of ground loops however on the other hand one must always need to find a reference point connection for each probe.As we move more and more into SMD this can become a problem needing reference leads tacked onto the circuit in numerous places.OTOH it negates the need to buy differential probes.Still, performance wise a cheap Asian DSO would whip its bum with a much better feature set.

author: thm_w
author_rank: Super Contributor
timestamp: December 17, 2019, 01:19:19 am
content: Maybe the DSO6014A can be hacked:https://www.eevblog.com/forum/testgear/agilent-dso7014a-upgrade-to-mso7054a/OP: you need to post some prices though, if this is $400 its worth it, if its $4,000 then hell no.

author: KE5FX
author_rank: Super Contributor
timestamp: December 17, 2019, 01:52:41 am
content: Yay, another scope debate. Those are always fun.Also, that particular Agilent model is superior to anything produced by Tek since the 547.
Scope probe voltage derating vs frequency - Page 1
Forum section: electronics / testgear

author: schmitt trigger
author_rank: Super Contributor
timestamp: December 16, 2019, 10:05:57 pm
content: What is the reason for a scope probe to be voltage derated with frequency?This is a generic probe from TPI, but have seen the same behavior on other brands too.

author: tggzzz
author_rank: Super Contributor
timestamp: December 16, 2019, 11:09:50 pm
content: The cable is alossycoax; the core is typically 200ohms from end to end.Currents flowing in the core produce heat.With (distributed) capacitance, the higher the frequency, the higher the current - and the larger the heat dissipation.

author: Keysight DanielBogdanoff
author_rank: Unknown
timestamp: December 17, 2019, 12:42:48 am
content: We have a video on it here:https://youtu.be/zTOHuUhOnQYBut, like others have said, it's C dependent.
Output signal of DE-5000 - Page 1
Forum section: electronics / testgear

author: ammjy
author_rank: Regular Contributor
timestamp: December 16, 2019, 01:01:24 am
content: Hello, EEVBlog,I have check output signal from DE-5000 through my scope.all mode's, Lp, Ls, Cp, Cs, Rp, Rs are using same sine wave signal. (only DCR mode are using some DC signal.)Vmax, Vmin, Duty Cycle is always is same and only Frequency are changing by "FREQ" selection.DCR mode signal has 920 mVmax, 840 mVavg. But, attached measured graph has some noise I think.my scope is OWON VDS3102 USB scope, so might be more nice good scope will show more correct result.

author: DaJMasta
author_rank: Super Contributor
timestamp: December 16, 2019, 03:38:17 am
content: To measure impedance, you apply a known reference signal to one side of the device, then you read the magnitude (voltage and current) of the source and phase from the other (or in the case of SWR measurements and stuff, from the returned signal on the same side through a bridge). This gives you your impedance, which is used to determine LC parameters, so this is required for the operation of the device and is expected of any LCR meter that's operating normally.
Rigol DS4000 freeze at boot up - Page 1
Forum section: electronics / testgear

author: rudy_sj
author_rank: Newbie
timestamp: December 12, 2019, 09:36:30 am
content: Hi,I have a Rigol DS4000 series scope, the DS4024. Had it for a few years and it has been absolutely fine, until now. It locks up on booting and shows only "Rigol" on the screen and a bunch of LED's are lit. Stays like this forever. I have read other places here on this forum about something similar with other models of Rigol scopes and that they are fixing different freeze issues with some clever button pressing. However those procedures doesn't work on my scope.One thing does respond though, if I press the "Help" button on power up, it doesn't even say "Rigol". The screen is black. The only sign of life now is the "Single" button is lit. Would not surprise me if this scope also had some hidden button pressing magic tics up its sleve.Anybody having a clue?I would be very happy.Rudy

author: thm_w
author_rank: Super Contributor
timestamp: December 13, 2019, 12:17:21 am
content: Unplug ethernet or USB if they are in, just in case.Get the firmware Update .GEL file onto a FAT32 formatted USB key (I recall certain types of keys being better or worse, so you could try FAT as well I suppose).Plug into scope.Power on, keep pressing Help see if anything upgrades.You could try the Single button as well, that is used on the mso5000.Discussion here:https://www.eevblog.com/forum/testgear/rigol-mso4000-and-ds4000-tests-bugs-firmware-questions-etc/20/

author: rudy_sj
author_rank: Newbie
timestamp: December 15, 2019, 08:03:31 pm
content: It's alive! Thanks thm_w!However, I don't know exactly how it happened. I had the new firmware on a USB storage plug, tried to press the "Help" key, but same thing i think.Then I repeatedly pressed the 5. left dark grey key during boot up, and it looked dead, but there was some signs of activity on the USB disc so I left it for a while.Turned it off and on, and it started!No clue if the new firmware is in or not. It says 00.02.03.SP2 on the screen, but the firmware read me file say v00.02.01.01 2017/08/15.Anyway, I'm very happy now!Rudy

author: rsjsouza
author_rank: Super Contributor
timestamp: December 15, 2019, 11:29:46 pm
content: Rudy, I recall one of the .zip files from Rigol jad a bad readme.txt. I used the previous version (mentioned in the file) for quite some time before seeing others report a version newer than mine (the one reported by your scope)
Hp1741 oscilloscope with 3314 function generator - Page 1
Forum section: electronics / testgear

author: Applemac
author_rank: Regular Contributor
timestamp: December 18, 2019, 08:08:38 pm
content: Hi, was wondering if anyone could help.using the hp3314 to generate a square wave, triangle wave etc I noticed when turning the time/div pot I would lose the trace on the oscilloscope.I then noticed if i wiggled the pot a bit the trace would appear. This leads me to suspect its not making good contact. I have cleaned the pot and contacts but still have this issue. Just wondering if anyone has any tips to fix this. Thxs

author: Applemac
author_rank: Regular Contributor
timestamp: December 20, 2019, 07:33:15 pm
content: No one.
TDS 620A Acquisition failure - Page 1
Forum section: electronics / testgear

author: mwbarth36
author_rank: Regular Contributor
timestamp: December 16, 2019, 02:34:40 am
content: A common problem with the TDS620A Tektronix scope is that it will pass all startup test except Acquisition and/or Acquisition Interface. Yes, I know about the leaky electrolytics, and replace all before even trying the scope. However, replacing the capacitors rarely, if ever, solves the Acquisition Fail problem. Have tried to insure there are no broken traces as a result of the leaking capacitors, but the job would be infinitely easier if there were a schematic diagram available for the Acquisition board. First, does anyone know if there is any hope of obtaining a schematic for this board? I have heard the TDS520B might be similar, but looking at the board layout, it is not obvious. Any help will be GREATLY appreciated!

author: madao
author_rank: Frequent Contributor
timestamp: December 16, 2019, 04:35:23 am
content: Have you washed PCB after removing of bad capacitor?Only replacing of eletrolytics doesn't run good.Than, pleas run SPC, if it fails , tries again (2-3x try)TDS640A Schematic exitist. But it is not exact same, but nearly to TDS620Ahttp://hakanh.com/dl/docs/hardtofind/TDS644A_A10(Acq).pdfI have a wish: Pleas shot a pic of your TDS620A Acquisition board, good quality. I want seeing him and added it to tekwiki (w140.com)regardsMatt

author: nctnico
author_rank: Super Contributor
timestamp: December 16, 2019, 11:54:46 am
content: You don't need the schematics. Just make sure to wash the board with alcohol and then Simple-green / St Marc. If there are still problems then resolder joints which have corrosion on them. From what I've seen one failure during boot is not so bad and replacing the capacitors + washing the board should do it. From what I've been told the board should never be washed using an ultra-sonic washer.

author: shakalnokturn
author_rank: Super Contributor
timestamp: December 16, 2019, 12:56:21 pm
content: https://www.eevblog.com/forum/repair/tds-620-still-failing-after-recap/msg1605454/#msg1605454Just cross-linking... I haven't got any further on mine since.Would be interested in some voltages / waveforms on a working scope's FISO for reference.

author: mwbarth36
author_rank: Regular Contributor
timestamp: December 17, 2019, 01:32:22 am
content: Will try to get a good photo of the acquisition board and send it. May take a few days. I have washed the board and checked the lands and feed thru's. Could have missed some, for sure, but feel there is another problem with this board. The schematics you reference are close, for sure, and will help a lot. Thanks again.

author: george.r
author_rank: Contributor
timestamp: December 17, 2019, 06:45:10 am
content: Check the flat cables going between A10 and A11. They are finicky and may cause ACQ to fail. Also the weird busboard right to the side of them, try reseating that a few times.
Looking for a logic analyzer - Page 1
Forum section: electronics / testgear

author: JuanGg
author_rank: Regular Contributor
timestamp: December 15, 2019, 05:21:25 pm
content: I am looking for a logic analyzer that will get used in the following scenarios.-A TTL CPU I'm designing.-Microcontrollers running at 50 MHz + and also dealing with CAN bus.One case requires more channels, less speed, and the other the opposite. I already have a 1054z DSO, but it does not have CAN decoding and more channels would come in handy for monitoring buses etc.My budget is around 100€, give or take.I have been looking into the DSLogic, which seems to have positive reviews (and it has state analysis!), yet I'd like to hear any recommendations. Also, I don't know if I should get the Plus or the Basic version, does the buffer memory justify the price difference?Many thanks, Juan