hybridfree/eevblog-posts huggingface dataset:
ET5407A+ Programmable DC Electronic Load teardown - Page 1
Forum section: electronics / testgear

author: hve
author_rank: Regular Contributor
timestamp: March 19, 2024, 01:15:54 pm
content: Hi All,Just received my mailbag, so I thought just share with you. Please not it is not a full review.Here are some internal pictures of the low cost ET5407A+ Programmable DC Electronic Load.The kit is about 120 euro's including shipping.Max Specs: 200W, 30A, 180VNotable components:- Powerfets 4 x IRFP250N Infineon hexfets- CPU GD32F30x Cortex-M4 core, 512K flash, 64K ramDid a few constant current tests: 1,2,3 Amps @ 20V and 10 amps @ 12V. All of these tests where within spec.I noticed during first power the LCD would scew-up when operating the buttons, flickering additional segments randomly lighting up. Turned out that some screws where missing, after fixing this the LCD was stable..Overall I am happy with the purchase.

author: adinsen
author_rank: Regular Contributor
timestamp: March 28, 2024, 12:39:38 pm
content: Thanks for your teardown and partial review. I wonder what the overall build quality is, given the lack of the two screws? Well spotted, thoughAre you planning more tests?

author: tppc
author_rank: Regular Contributor
timestamp: March 30, 2024, 08:42:43 am
content: Hi there,thanks for these pictures an information.I was wondering if this load has any communication capabilities.- Could you post a picture of the rear side of the instrument?- Does the manual mention any communication protocol?Kind Regards.PS. I found the manualhttps://www.easttester-cn.com/uploads/ET5406a+ET5407a+-DC-LOAD-User-Manual-.pdfThere is indeed a USB port but the manual does not describe the communication protocol.I should have googled before posting.

author: nixxon
author_rank: Frequent Contributor
timestamp: May 17, 2024, 02:50:37 pm
content: I just received my ET5407A+. I purchased the instrument from Aliexpress seller, East Tester Factory Store. It seems to be the manufacturer itself. The order was placed May 1 and I received the package in Norway yesterday, after only 15 days. The free shipping must have included air shipping. I paid US$ 131.49 + national 25% VAT for Norway.During initial tests (before reading the FM) I thought I had received a faulty unit. The load and my PSU was all over the place going min/max continously. It was all my bad. I believed that "Voltage/Current/Power Limits" was the target value for Voltage/Current/Power. But it was of course the cutout limit for the electronic load.The high range is displaying 0.2V lower voltage than actual voltage when in the lower voltages (1-10 volts). That is actually to be expected, as the high voltage range covers voltages all the way up to 180 volts. The low range is pretty accurate (max 21 volts). The actual amps drawn are pretty accurate to the set value, according to my Fluke 83V.The settings menu is a pain using only 7 segment display. I guess the ET5410A+ and above with a "2.8-inch TFT LCD screen with rich display contents" color display would be way easier to understand.All in all I am happy
Bosean FS-5000 Geiger counter - Page 1
Forum section: electronics / testgear

author: Calambres
author_rank: Frequent Contributor
timestamp: March 18, 2024, 08:46:39 am
content: Anyone tried the Bosean FS-5000 cheap Geiger counter. I've seen a good review but regarding youtube reviews, who knows...

author: TheQuickFox
author_rank: Newbie
timestamp: May 11, 2024, 09:51:17 pm
content: I just ordered one. I live close to an expired nuclear power plant. When it goes kaboom I will tell you if the detector works. (Or when the our wise world leaders decide in favor of nuclear war as means of conflict resolution)

author: Calambres
author_rank: Frequent Contributor
timestamp: May 12, 2024, 07:31:49 am
content: I bought one since I started this thread. It works well and give consistent readings but I do not have another counter to compare with.
OWON / VEVOR SDS1102 probe tips - Page 1
Forum section: electronics / testgear

author: Elecmuso
author_rank: Contributor
timestamp: May 11, 2024, 12:34:12 am
content: Is there a trick to removing the tips on the provided scope probes (OW3100)? I have tried with a lot of force to pull them off, any more force I feel could damage them. Is it just a case of pulling harder??!!

author: thm_w
author_rank: Super Contributor
timestamp: May 11, 2024, 12:42:34 am
content: Some probe tips unscrew, some probe tips unclip.Try to unscrew them first, if they just spin forever then they should unclip and you just need to pull a bit harder. They may get easier with use.Fairly sure those are clip ones, you could check the manual too if there is one.

author: Elecmuso
author_rank: Contributor
timestamp: May 11, 2024, 02:11:34 am
content: Cheers. Already checked / searched the scope manual and the separate manual for the probes. Not mentioned anywhere!

author: Aldo22
author_rank: Super Contributor
timestamp: May 11, 2024, 09:34:30 am
content: The first time they are often a bit tough.I had my doubts too, but it worked with pulling. (But they were not from Owon)Do they look like this? (From:https://www.amazon.de/OWON-HDS200-Handoszilloskop-Labor-Oszilloskope/dp/B0BX6KMYM2?th=1)

author: TizianoHV
author_rank: Regular Contributor
timestamp: May 11, 2024, 10:43:29 am
content: I have an OWON VDS1022I too. I had the same problem. If you want to remove the tip you have to pull a LOT.After some time they started making bad contact and I had to repair them. So you should avoid remooving them often.Now I just keep one with the tip and the other without.

author: Elecmuso
author_rank: Contributor
timestamp: May 11, 2024, 01:39:45 pm
content: Yep that's them. I will have to pull harder!

author: Elecmuso
author_rank: Contributor
timestamp: May 12, 2024, 02:43:30 am
content: Confirmed - probes now separated.
Fluke 77 - Page 1
Forum section: electronics / testgear

author: boful
author_rank: Contributor
timestamp: May 16, 2024, 05:15:41 pm
content: Greetings.Searched and just can not find what the difference is between the Fluke 77 series I versus series II.These are great basic no frills simple multimeters. Still work great after like 40 years.Thanks.

author: tooki
author_rank: Super Contributor
timestamp: May 16, 2024, 05:38:03 pm
content: One thing that’s visible just from comparing the front panels is that in the series I, the 10A range is unfused, while in series II it’s fused.
Anyone tried the RigExpert Tokenblauser GPSDO? - Page 1
Forum section: electronics / testgear

author: asmcool
author_rank: Newbie
timestamp: May 11, 2024, 07:50:33 pm
content: I can't find any reviews about this GPSDO. The RigExpert "Tokenblauser"! At $450 it costs alot more than the Chinese ebay stuff. It has some interesting features though, and schematics and source code are available. I was about to order a BG7 GPSDO but I found this thing. Could it be worth $450?https://rigexpert.com/products/ultra-precise-reference-clock/tokenblauser-low-noise-quad-channel-gpsdo/#

author: Electro Fan
author_rank: Super Contributor
timestamp: May 11, 2024, 08:50:58 pm
content: Looks interesting. RigExpert makes excellent antenna analyzers. This GPSDO is about 2x the price of a BG7TBL but it has some extra features including the 4 outputs which would be useful if you have more than 1 device to drive. On the other hand you could add an external BG7TBL distribution amp to the BG7TBL GPSDO for about $100 that would support 8 devices. Might come down to the reference clock specs.From a BG7TBL eBay ad:After GNSS is locked, frequency accuracy can reach 5E-9 (0.05Hz@10MHz) within 5 minutes. Finally, accuracy will reach 2E-11 (0.0002Hz@10MHz)
NI-210SU, China VI curve tracer with LCD-screen, noisy input B - Page 1
Forum section: electronics / testgear

author: eev_fan
author_rank: Contributor
timestamp: May 12, 2024, 03:55:13 pm
content: Boughtthistracer from AliExpress.As seen in the videos below channel B is noisy, both open and shorted to ground.Are they all like this?https://youtu.be/YOFYb0VQqDUhttps://youtu.be/wewnjm7-cPg
Youtube video for HM8118 LCR meter? - Page 1
Forum section: electronics / testgear

author: Faringdon
author_rank: Super Contributor
timestamp: May 09, 2024, 06:27:27 pm
content: Hi,Any decent guides to HM8118 (Hameg)..just need to measure some SMPS transformer leakage inductances, and pri and sec inductance.i only found this

author: RolandK
author_rank: Regular Contributor
timestamp: May 09, 2024, 07:10:39 pm
content: Transfomer measurement is described in chapter "8.3 4-wire Transformer Test Lead R&S®HZ186" of the manual. The manual may have multiple languages, just look for your preferred one.

author: pdenisowski
author_rank: Super Contributor
timestamp: May 09, 2024, 07:50:31 pm
content: I have videos on how to do this (leakage, primary, and secondary inductance) with the HM8118's successor, the LCX. The interface on the LCX is somewhat different, but the concepts are the same:(the parts you might be interested in start at 7:33)And another one by our LCR meter product managerIf you prefer reading to videos, the same material is in an educational note I wrote:https://www.rohde-schwarz.com/us/applications/understanding-transformer-testing-educational-note_230850-1471874.html

author: Faringdon
author_rank: Super Contributor
timestamp: May 11, 2024, 12:41:34 pm
content: Thanks, at 24:21 of this Hameg HM8118 LCR meter video, the Device wrongly selects parallel mode and gives totally the wrong inductance measurementSurely most capacitor and inductor readings would be in series mode.....so why did it default to parallel mode.?Also, at 11:50 of the video, he measures the test voltage which is set to 1V....i would think this would be a good thing for us to do as a cheap way to see if the LCR meter is calibrated?....we will also measure the frequency of this test voltage and check it corresponds to what was set.___----__---___---___Hi, At 8:51 of this video, they show measuring the primary inductance of a transformer with the LCX-Z5 test fixture.......However they do not show how to do a suitable open/short calibration method prior to this. Is it OK to connect the H leads together and L leads together to do the open calibration?...and then all of them shorted together to do the short circuit calibration?......i ask, because the open/short calibration prior to transformer measurements, shown at 02:40 of the video, does not do it like this.Also, if you have the LCX-Z5 , but are using it with the Hameg HM8118, then can you simply use the LCX-Z5 to measure inductances, by pressing the "L-R" button? (ie not the "M" or "N" buttons)____________----------------Also, regarding the Hameg HZ186 transformer test fixture, the open/short calibration is described on page 62 of the following.....https://scdn.rohde-schwarz.com/ur/pws/dl_downloads/dl_common_library/dl_manuals/gb_1/h/hm8118_1/HM8118_UserManual_de_en_06.pdfHowever, 2:20 of this video.........shows the open/short calibration being very different for the LCX-Z5, which is equivalent to the HZ186. Do you know the reason for the difference?
DMM that beeps short and long in Diode Mode? - Page 1
Forum section: electronics / testgear

author: dreico33
author_rank: Newbie
timestamp: May 09, 2024, 02:15:58 pm
content: Hellow guys, glad to be here.I am looking for a DMM that does that , Beeps Short if the component is ok beeps long when is not.What you would suggest me, i am on budget so i can not afford too many $$.Thank you very much.

author: ebastler
author_rank: Super Contributor
timestamp: May 09, 2024, 03:24:01 pm
content: It's not entirely clear to me what you mean by "OK vs. not OK". But I assume you are after the feature discussed here:https://www.eevblog.com/forum/testgear/dmm-other-than-flukes-that-chirp-on-diodetransistor-test/

author: elantric
author_rank: Contributor
timestamp: May 09, 2024, 07:13:44 pm
content: UNI-T UT117C provides this feature , often common on Fluke meters

author: ebastler
author_rank: Super Contributor
timestamp: May 09, 2024, 09:25:51 pm
content: The older thread I linked to mentions the UT117C, as well as various other Uni-T and Brymen meters which have this function.

author: Martin72
author_rank: Super Contributor
timestamp: May 09, 2024, 09:46:49 pm
content: Quote from: elantric on May 09, 2024, 07:13:44 pmDefinitely the 87V (short beep then indication of forward voltage, continuous beep on short circuit), but we also have fluke 115/117/175/179 and a few other models, I could test these the week after next.

author: Anthocyanina
author_rank: Frequent Contributor
timestamp: May 09, 2024, 10:06:56 pm
content: Quote from: Martin72 on May 09, 2024, 09:46:49 pmjust checked, the fluke 117 does this too

author: Martin72
author_rank: Super Contributor
timestamp: May 09, 2024, 10:42:29 pm
content: Nice

author: dreico33
author_rank: Newbie
timestamp: May 10, 2024, 01:35:40 pm
content: Thank you very much guys , i guess i gave plentey info.!
dual knobs for time/div on leader 8060 oscilloscope - Page 1
Forum section: electronics / testgear

author: danielphantom
author_rank: Newbie
timestamp: May 10, 2024, 01:04:58 am
content: Hello,I have been trying to see how to use this knob that has 3 sections. Top right of the panel-- The larger outer knob is labeled "A" the middle knob is labeled "B" and the inner knob is labelled "A variable"When the outer knob for "A" is turned, the middle and inner knob follow along. When manually move the middle "B" knob, both traces (channel 1 and channel 2) change in their time/div so both waveforms stretch or contract. I was thinking that the A knob controls channel 1 and the B knob controls channel 2.Am I misunderstanding what that middle knob is for? Can it change the time/div setting for channel 2? Am I confusing A and B for channel 1 and channel 2?Here is a pic, the knob I'm talking about is at top right of course.Thanks in advance for any tips,Daniel

author: bdunham7
author_rank: Super Contributor
timestamp: May 10, 2024, 01:31:02 am
content: A and B are triggers, also called A sweep and B sweep. The scope is dual-timebase, which means that it can use two different horizontal sweep rates for the two different trigger events. This is a "zoom" function that allows you to magnify (horizontally) one particular part of the waveform. This is not the same as CH1 and CH2, you cannot have different timebases for the channels. The B-sweep cannot be slower than the A-sweep, so if you turn the B-sweep timebase knob counterclockwise, it should eventually catch the A-sweep knob and turn that as well. If it hasn't done that, then adjusting the B-sweep timebases should have no effect on your A-sweep appearance. The picture you posted shows the scope configured to only show the A-sweep but I can't read the B-sweep timebase setting so I don't know if this is an issue or not.

author: CatalinaWOW
author_rank: Super Contributor
timestamp: May 10, 2024, 05:37:44 am
content: Note also the B Trigger switch near top center. As position it works as bdunham7 describes. The other choices aren't completely different, but are useful at times. Some less so as NTSC/PAL aren't very common anymore.
AliExpress IT1008 injection transformer  - Page 1
Forum section: electronics / testgear

author: georgeharker
author_rank: Newbie
timestamp: May 04, 2024, 03:20:27 pm
content: I’m going to be doing some analysis on a synchronous buck dc dc power supply and am looking for a signal transformer.I am aware of the DIY solutions which look amazing but I fear my side project count is already too large, and I am aware of the several commercial options which are pretty pricey.I came across this:https://www.aliexpress.us/item/3256804910302075.html?gatewayAdapt=glo2usa4itemAdaptAnd for the price I’m tempted to give it a shot. Anyone have any thoughts / experiences?

author: coromonadalix
author_rank: Super Contributor
timestamp: May 04, 2024, 03:25:55 pm
content: and you are aware that many things from Ali could be not as advertized .... sure you have some warranties if the shipping doesn't take too long

author: georgeharker
author_rank: Newbie
timestamp: May 04, 2024, 04:15:13 pm
content: Absolutely. I’m just curious if it’s worth the punt to see if it would do the job. Could never arrive or could not work as advertised. I’d definitely measure before using.

author: georgeharker
author_rank: Newbie
timestamp: May 10, 2024, 05:59:01 am
content: Ok. Bit the bullet on side projects and wound a core myself. It’s looking decent. Current measurements say -3db at about 25Hz and pretty flat out to 1MHz rolling off to -2db at about 4MHz. But I’ll wait until I’ve housed it with proper terminations and premature before posting results properly.
Agilent 34410A without LXI - Page 1
Forum section: electronics / testgear

author: StefikMichal
author_rank: Contributor
timestamp: May 08, 2024, 10:27:36 pm
content: Hello, some time ago, I bought an Agilent 34410A from an auction site. I was just playing with it, scrolling through the menus, measuring some values, and saw some weird thing. Although it has an RJ-45 LAN connector, the LXI marking above it is whithened, and there is also no LXI logo on the front panel. You can see that in the attached pictures. I haven't tested the network functionality yet, but from my judging, it's some kind of early model (because all the other 34410As I've ever seen had the LXI logo). What does that mean for me from the perspective of network capabilities as a hobbyist?

author: coromonadalix
author_rank: Super Contributor
timestamp: May 08, 2024, 10:50:52 pm
content: fw version ? there are fw upgrades available as for LXinormally it should answer scpi commands thru lan or usb, verify in the menu if they are activeinstall R&S visa package you have 32bit and 64 bit tool in them to send commands ...

author: StefikMichal
author_rank: Contributor
timestamp: May 08, 2024, 10:55:51 pm
content: Thanks for reply. I don't remember FW version, will check that when I got home.
agilent dsox2024a probe recommendations - Page 1
Forum section: electronics / testgear

author: lamikr
author_rank: Newbie
timestamp: May 08, 2024, 09:47:16 am
content: I bought the Agilent's dso x 2024a oscilloscope and would need some recommendations for probes. It's a 4 channel/200mHZ model and I do not have any probes for it at the moment. According to Dave's EEVblog #143 review, this scope has originally relased with 4 300mHZ N2863B passive probes.According to keysight, that probe is now obsolete but some are available on ebay. Would you go with this probe or something else? Not sure for example whether there exist 3rd party probes? Or possibility to use other vendor probes with some bnc adapter?

author: 2N3055
author_rank: Super Contributor
timestamp: May 08, 2024, 10:43:15 am
content: Quote from: lamikr on May 08, 2024, 09:47:16 amOn scope front panel next to BNC there is specification in form of 1MΩ // 14pF.OTOH, the probes in their specifications specify "compensation range".If probe has capacitance of your scope in compensation range", you will be able to compensate probe and be able to use it with your scope. It can be noname, Rigol, Siglent, Testec, Hantek, Owon, no matter.There will be differences in quality, type and number of accessories of course.Usually even inexpensive probes will work well enough..

author: AndyC_772
author_rank: Super Contributor
timestamp: May 08, 2024, 01:00:30 pm
content: Keysight N2843A is the current 500 MHz model, and should be directly compatible. I've been replacing my N2890A probes with them as and when they've worn out.Personally I wouldn't buy used probes, you don't know how they've been handled or how much use they've had, and they don't last forever.

author: Aiy
author_rank: Regular Contributor
timestamp: May 08, 2024, 04:44:17 pm
content: Hi there,I use Tektronix TPS0201's with mine. P2220 and TPP0200 are also alternatives.Usually available at reasonable prices new or old stock from many sources.I really like the tek probes that "lock" with a satisfying click when you put on the the probe hook tips.Best regards,

author: lamikr
author_rank: Newbie
timestamp: May 08, 2024, 05:19:31 pm
content: Quote from: AndyC_772 on May 08, 2024, 01:00:30 pmYes, I think you are right about used ones, unless they come from some test company. This agilent scope is for my personal/home use and for that the N2843A is quite pricey. I think I will try to find some cheaper 100-300mHZ options.
Wavetek & Beckman Breakout Boxes - Page 1
Forum section: electronics / testgear

author: Brians6
author_rank: Newbie
timestamp: May 08, 2024, 01:08:12 pm
content: I'm doing some work with interfaces & doing some research on the test equipment & interfacing.I'm interested in both serial & parallel & the various types of test equipment, breakout boxes, line monitors & "Smart Cable" interface aids.I haven't managed to find a manual for a Parallel Breakout Box even though I've seen photos of them.Breakout boxes & line monitors are available on ePay etc but most do not have the manuals with them.I am sure that there are members with lots of experience & that may even have manuals laying around.I'd appreciate if members could look to see if they do have manuals & contact me if they have specific hints on interfacing.I have seen the occasional comment about equipment that will damage test equipment or is particularly difficult to interface but haven't found a single repository so I'm starting to put it together for myself.I'm also interested in the link between the Wavetek & Beckman Industrial brands for their breakout boxes.The products appear to be the same although Beckman uses the "Easy Bob" terminology.One breakout box I've seen is Beckman but the manual with it is Wavetek.I should be getting some information on the 725, 735, 775 & 785 but I don't have anything on the 730, 750 etc series.Many thanks,Brian Symons.
Hantek HDP4000 power supply series - Page 1
Forum section: electronics / testgear

author: ddavidebor
author_rank: Super Contributor
timestamp: May 04, 2023, 08:09:45 pm
content: I have looked at the Hantek website for the first time in 5 years, and they seem to have released some interesting pieces of equipment.This is onehttp://www.hantek.com/products/detail/171883-4 channel PSU, good specs, UI, and connectivityCannot find any teardown or reviews, does anyone have info?Price seem similar to rigolhttps://vi.aliexpress.com/item/1005003533705317.html?gatewayAdapt=glo2vnm

author: jjoonathan
author_rank: Frequent Contributor
timestamp: May 04, 2023, 08:37:51 pm
content: I, too am waiting for a review. I like the industrial design and the specs of these power supplies.Unfortunately I cannot be the one to take the leap of faith because I have trust issues with Hantek: I had an extremely negative experience with Hantek USB scopes about a decade ago and since then I've seen more than a few data points indicating that their products continue to lie on the far end of the buggier side of the quality spectrum. I've killed expensive prototypes with cheap power supplies (the kkmoon supplies that dump 48V capacitors into the output if you interrupt power), so you can imagine how these factors combine to give me 0 desire to be the guinea pig on this one.But I do like the industrial design. I hope my caution is not warranted and I hope someone else comes along to prove itFWIW, my 4 channel GW Instek supply continues to serve me well.

author: DavidAlfa
author_rank: Super Contributor
timestamp: May 04, 2023, 11:19:47 pm
content: I'd run from any Hantek-made device...

author: cmato
author_rank: Newbie
timestamp: May 07, 2024, 11:24:30 pm
content: I am also interested for this Hantek PSU, it looks similiar as Keysight E36300. In Hantek manual are screenshots from Keysight PC software. But who know what is inside... I also didn't find detailed review, or experiences. Only another topic with ethernet, firmware issue. I have cheap switching PSU, one analog, and one digital, but both are crappy... Or maybe I will repair old analog huge linear PSU. Keysight is for me very expensive. I want to have separate knobs for voltage and current and data logger is also good feature.Can somebody write experiences with Hantek PSU?

author: Microcheap
author_rank: Frequent Contributor
timestamp: May 08, 2024, 08:53:20 am
content: I got one HDP4324 recently. I didn't have the time to fully test it but, at least, the basic functions are working as expected.I took some quick pictures for reference, the build quality seems good.I've been planning to run a full test of my power supply for some time. I hope I will be able to do that soon and then I can post more details about it, I will also try to take some better pictures.
ZKETECH chargers/loads question - could it be used to test PSU? - Page 1
Forum section: electronics / testgear

author: Bobson
author_rank: Regular Contributor
timestamp: May 04, 2024, 06:43:39 pm
content: Could ZKETECH EBC/EBD series be used as an electronic load to test small DC PSUs?Also I have 2-quadrant Hewlett Packard PSU which is very versatile, but can handle only low loads.Don't know if it is feasible. Now using Rigol DL load, but it is not always available.

author: Kean
author_rank: Unknown
timestamp: May 05, 2024, 07:57:53 pm
content: I don’t see why not. I have a couple of ZKE EBC-A05 units but never tried then as a dummy load other than for discharging batteries.The 2-quadrant HP supplies like the 6612B can sink up to 1A but it isn’t programmable. Other 66xx models have different limitations. Of course your test circuit will need to be able to handle an input voltage from the PSU, or you’ll need a blocking diode.

author: Bobson
author_rank: Regular Contributor
timestamp: May 07, 2024, 06:38:49 pm
content: Thanks. Yes, my 66312A can sink only 1.2A max, so it is not good for the task ( I need to measure 12V and 19V power bricks 3 to 5A). But it is programmable.
Inlet power filter grounding considerations - Page 1
Forum section: electronics / testgear

author: Nevada
author_rank: Contributor
timestamp: May 07, 2024, 05:40:49 pm
content: Hi,I have some older test equipment with "classical" power input filter (by Schaffner), without ground pin. The device is double insulated, so it can't be grounded to the PE (AFAIK).How can I replace the filter correctly? If I simply buy a new filter with the usual IEC socket (L/N/PE), then I technically ground the device to the PE, since it has metal case, and the filter has also a metal shield, which is directly connected to the ground (PE pin). The other problem is that the circuit in the new filters is also connected to the metal shiled, which means that at least one or two capacitor is present between the L and the metal housing. I feel that I can't simply put a new (grounded) filter in it if I don't want to break the double insulation rules.
Bode 100 to measure ESL and ESR of SMD electrolytic? - Page 1
Forum section: electronics / testgear

author: Faringdon
author_rank: Super Contributor
timestamp: May 06, 2024, 07:00:20 pm
content: Hi,Do you have any better tutorials than this for measuring ESL and ESR of 50V, 470uF Al Electro cap (SMD) at 450kHz, and over 1kHz to 1Mhz?

author: Martin72
author_rank: Super Contributor
timestamp: May 06, 2024, 08:02:35 pm
content: Hi,https://www.eevblog.com/forum/testgear/measure-capacitor-for-esl-and-esr-and-c-over-frequency/Why a new thread ?

author: Simon
author_rank: Unknown
timestamp: May 07, 2024, 06:32:20 pm
content: Just buy wurth capacitors, they give full ESR graphs.
Relocate R&S 835-8011-58 SMHU output from rear panel to front panel? - Page 1
Forum section: electronics / testgear

author: usagi
author_rank: Frequent Contributor
timestamp: May 07, 2024, 04:17:15 am
content: Anyone know how to relocate the outputs of the R&S 835-8011-58 SMHU from the rear panel back to the front panel?I bought a used one off ebay and the ports are in the back. The operating manual indicates they can be moved, but gives no details how this is done.The service manual doesn't describe this either.
ifr /aeroflex 2399 firmware request - Page 1
Forum section: electronics / testgear

author: jry
author_rank: Newbie
timestamp: May 06, 2024, 10:04:21 pm
content: I have a 2399 that no longer boots.looking for a copy of the firmware.it's on an IDE flash drive ...pretty small by todays standards ...around 256 MB IIRC.a linux based gzip'd dd image would be greatthanksJohn
Keysight/Agilent N5306A PCIe Analyzer license issue - Page 1
Forum section: electronics / testgear

author: Myriad79
author_rank: Newbie
timestamp: December 26, 2023, 09:53:35 pm
content: Hi there,for a hobby project I'm working on, I recently bought some Agilent N5302A chassis, a N5306A PCIe Analyzer board and some N5315A-A04 passive probe on Ebay.After having messed around with the Software for quite some time, I got it to boot using DHCP and FTP hosted on an old WindowsXP machine. So far so good.However, it seems I'm lacking some kind of license to go along with it.When I start the Protcol Analyzer software and am about to start capture, I get an error dialog saying "Unable to start analyzer: Port handle is invalid. Module 101 is not licensed for Protocol Analysis at current port speed."This is regardless of which link speed I'm using, which probe type I select, etc.Now I'm wondering whether I'm missing some license to be installed on my local machine, despite the hints Alex has given inhttps://www.eevblog.com/forum/testgear/agilent-n5306a-pcie-protocol-analyzer/msg1199751/#msg1199751.Unfortunately, he hasn't been around in years.Does anyone know ifa) there's indeed a license file neededb) the module I have might be unsuitable (even though it is an N5306A PCIe Analyzer and was declared as such on Ebay, its back has a sticker labeled "Protocol Analyzer for Infiniband x12 enabled", whereas others read e.g. "x8 Analyzer for PCIE 5Gb/s")c) there are still possibilities in retrieving a key directly from Keysight, despite it's been discontinued already some years ago and I have no original documents such as order etc.d) alternatives do exist? (I briefly looked at the software but this seems a humongous venue to reverse)Thanks in advance!BR Thomas

author: darkroom
author_rank: Contributor
timestamp: May 06, 2024, 07:34:29 pm
content: Hi,The license is actually in the card from my understanding.Did you have to do anything special to get the FTP working? I got the DHCP working, but when I try to run the diagnostics, it tries to load a file, and that doesn't work. I'd be interested in what you had to do.Thanks!Austin
Can someone show me the DIG board of a CMU200 ?  - Page 1
Forum section: electronics / testgear

author: electronic_guy
author_rank: Regular Contributor
timestamp: April 07, 2024, 05:11:49 am
content: Hi,It has been discussed to length that faulty DIG board can freeze the CMU200. But having opened the B68 and B21, I can see several small boards with the sticker DIG on them. See the picture attached, it shows inside the B21. I’m confused as to what they refer to when they say replacing the DIG board. Can someone show me a picture and in which module this module board exists ?Thank you.

author: electronic_guy
author_rank: Regular Contributor
timestamp: April 09, 2024, 09:23:43 pm
content: Can someone please support on this ?

author: _Wim_
author_rank: Super Contributor
timestamp: April 10, 2024, 08:05:07 am
content: When talking about the digital board, it is the complete board in slot A7, not a separate module on one of those boards...

author: electronic_guy
author_rank: Regular Contributor
timestamp: May 05, 2024, 12:22:56 pm
content: Thank you for the clarification.Is there any way I can buy a digital board to replace mine ? I found that ebay doesn’t have any listings for those. Is there a number or something I should use to search it ?
service manual - Page 1
Forum section: electronics / testgear

author: Eduad
author_rank: Newbie
timestamp: May 06, 2024, 09:24:09 am
content: Hello. I have a repair here with DVM645BI multimeter, someone has service manual for my. Photos follow, thanks

author: coromonadalix
author_rank: Super Contributor
timestamp: May 06, 2024, 10:00:27 am
content: ask velleman ?Sold iunder this name Velleman DVM645BIand maybe other names ...https://cdn.velleman.eu/downloads/1/dvm645bisoftware.rarcontrol software attached. remove the txt extension it's a rar filethe best thing is open the meter and search for the main dmm ic many Mastech have Fortune Semiconductor, or maybe Cyrustek ic'sexamples here :https://sigrok.org/wiki/Multimeter_ICs
DIAL - AN - OHM DA52-3X by General Resistance *Teardown - Page 1
Forum section: electronics / testgear

author: Vertamps
author_rank: Contributor
timestamp: May 05, 2024, 10:17:38 pm
content: The switches depending on mechanically settle/snugged up or down on its selection caused change in resistance. The low ranges were pretty off (non-cal-ed meters,non metrology connections), So i figured taking it apart.Notes: Copper rivets are 2.38mm with a few ribs (wider). I chose to solder some solid copper wire to hold the pcb's back in place. Do not drill out the rivets like i did on the second board, just snip them(rounded out the pcb). I bought two 1.1111k boxes. Will fully clean the contacts when i have suitable rivets.Nye lubricants said that there RHEOLUBE 362CP is what there potentiometer customers use. So i use it on all contacts and pots i rebuild.
Lecroy Wavesurfer 44MX vs WS3054 - Page 1
Forum section: electronics / testgear

author: newtekuser
author_rank: Frequent Contributor
timestamp: April 23, 2024, 05:29:46 am
content: Apart from slight bandwidth and sampling difference, does one have an edge over the other? From what I’ve read both are Windows scopes based on the MAUI interface.I’m not able to find any official info on the 44MX on Lecroy’s website and not familiar with their scopes brand, but I am familiar with their PCIe and network traffic analyzers which I’ve used at work.

author: alm
author_rank: Super Contributor
timestamp: April 23, 2024, 07:18:11 am
content: I haven't used either scopes, but from this thread it sounds like the WS3000 series might be a bit under-powered with simpler software than the full Windows-based MAUI scopes:https://www.eevblog.com/forum/testgear/lecroy-wavesurfer-3054/The Wavesurfer 44MX is a full Windows scope that will likely perform better, although it sounds like itspower supply is not the most reliable.

author: tautech
author_rank: Super Contributor
timestamp: April 23, 2024, 07:51:09 am
content: Quote from: alm on April 23, 2024, 07:18:11 amWS3000/SDS3000 is a 10+ year old collaboration with Siglent that we have never seen in the west other than as a LeCroy.A few years back to address the lack of processing power and utilise the new Xilinx processors the updated WS3000Z was born and the LeCroy/Siglent marketing agreement continued.https://www.siglent.com/products-overview/sds3000x/I got my hands on a SDS3104 when visiting Siglent HQ in 2014 however the UI only offered a Chinese language option.

author: 2N3055
author_rank: Super Contributor
timestamp: April 23, 2024, 10:39:29 am
content: Make note there is also WS3000Z which is much newer refresh that is much faster and has some things improved..

author: Martin72
author_rank: Super Contributor
timestamp: April 23, 2024, 10:57:19 am
content: For heaven's sake, hands off a WS3000 without Z....Very slow, at least two nasty bugs still present, absolutely not recommended.We had the WS3024, but it has since been replaced by a WS3024Z, which is much faster and doesn't have the bugs.

author: newtekuser
author_rank: Frequent Contributor
timestamp: April 23, 2024, 02:44:53 pm
content: Thank you all!

author: newtekuser
author_rank: Frequent Contributor
timestamp: May 05, 2024, 04:50:24 pm
content: Does anyone know how much faster the UI of the 44mxs-b is compared to an older tds5054b scope? I know the latter is a much much older scope and feels sluggish (I own one). What about more modern Siglent 1000/2000 HD series compared to the 44MXs-B, or is this comparing apples to oranges?
Rigol DG800 burst/sweep wont trigger on external signal - Page 1
Forum section: electronics / testgear

author: eTobey
author_rank: Super Contributor
timestamp: May 06, 2024, 08:06:39 am
content: Hi,i tried using the ext trigger input, but i cant get it to work. But i could get FM modulation to work, so i think there is no issue on the "outside" of the device.Using the manual trigger, it works.Anyone else had issues here?

author: TurboTom
author_rank: Super Contributor
timestamp: May 06, 2024, 06:58:24 pm
content: On mine, it's working perfectly well. I used Ch2 to trigger Ch1, arbitrary burst. I found the Ext. trigger threshold to be approx. 1.6V with a hysteresis of round about 120mV.I'm using firmware 02.05.00.00 on mine since the later firmware 02.06.00.01 broke the selection menus for arbitrary waveforms (and Rigol specified the reduced set of built-in arbitraries in their latest user's guide, p.52, so it's not a bug but a feature...).I don't know if the firmware also causes your difficulties to get the external trigger input running. I didn't update mine for testing.
Bench top signal generators vs AD9850 DDS chip - Page 1
Forum section: electronics / testgear

author: e100
author_rank: Frequent Contributor
timestamp: May 05, 2024, 01:21:12 am
content: Other than providing a friendly user interface, do low cost bench top sig gens actually do more than what a basic DDS chip such as the AD9850 can do?

author: rfdave#gmail.com
author_rank: Contributor
timestamp: May 05, 2024, 02:11:37 am
content: adjustable output power, wider frequency range, analog/digital modulation all come to mind

author: 2N3055
author_rank: Super Contributor
timestamp: May 05, 2024, 08:20:33 am
content: Quote from: e100 on May 05, 2024, 01:21:12 amAD9850 is a single chip that, sitting on a desk has no capabilities.AWG device is a complete, functional device.Download few datasheets for AWGs and read what they provide.And then take a piece of paper and start writing all the stuff you need to add to AD9850 to achieve parity..Or maybe you meant to ask can AWG create more (different ?) waveform shapes than AD9850 ?That is also in AWG device datasheets.. Short answer, they do.

author: Aldo22
author_rank: Super Contributor
timestamp: May 05, 2024, 09:23:20 am
content: 2N3055 is right.I don't know exactly what you're comparing it to, but it's a bit like asking “can a car do more than an engine”?If you take a cheap AWG like theFY3224sas a comparison, then I would say:It's an AWG with lots of built-in waveforms and you can define your own on the PC (arbitrary waveforms) and upload them to the AWG.DC and pulse are also supported.It has max. 20Vpp (no load) amplitude.You can adjust each channel separately: Frequency, Amplitude, Offset, Duty cycle, Phase and Pulse width if required.It has a sweep function.It has a burst function.It is fully controllable via serial interface.Frequency and counter measurements are possible.It has two TTL outputs that can be used externally as triggers.Presets can be saved and loaded.etc.
Tektronix P5200A "teardown" - Page 1
Forum section: electronics / testgear

author: PwrElectronics
author_rank: Regular Contributor
timestamp: May 04, 2024, 11:04:05 pm
content: I found a P5200A Tek Differential probe in the broken tools bin recently.Decided to check it out. Maybe a simple fix or at least some tear-down photos??This thing was not easy to get into. Its not designed to be taken apart or serviced. The membrane switch overlay also hides the screws holding the clam shell together. So, you will end up cutting the ends of the overlay to get at the screws. I found this out after more carnage trying to cut the case apart.Once "IN", here are some pictures of the board, etc.A video of my troubleshooting of this.https://youtu.be/rYr7fdZKJQATurns out that someone applied reverse voltage to the power and blew/shorted a clamping diode across the power input. I was able to get this working again with removing the destroyed diode. But, the mechanical damage caused by me to get access to this would prevent it from being a viable repair in any corporate lab situation.
HP 3585a Spectrum Analyser throws "Calibration Error 17" error - Page 1
Forum section: electronics / testgear

author: timshoe
author_rank: Newbie
timestamp: May 09, 2024, 01:37:55 am
content: I just got an HP 3585a from a fellow Ham because it quit working and he was tired of lugging an 88 lb door stop around. After a couple days work, I tracked down the problem to a shorted tantalum cap on the A26 board that was pulling down the 15v supply. The unit seems to work well now except that it keeps trying to do a calibrate every few minutes and throws a "Calibration Error 17". I went through the manuals and found the error code, but not much information on what causes it.Has anyone seen this problem and fixed it? I searched the web with no joy.Thank you.Tim

author: KE5FX
author_rank: Super Contributor
timestamp: May 09, 2024, 02:28:33 am
content: You might check with the HP-Agilent-Keysight-equipment mailing list on groups.io -- that error code may ring a bell with someone.The 3585A here doesn't get used too much but it has been surprisingly reliable for years, given its age. I feel lucky that I've never had to pull it out of the rack.
Fluke 8846A IEEE Error - Page 1
Forum section: electronics / testgear

author: Louis_C
author_rank: Contributor
timestamp: May 03, 2024, 06:48:23 pm
content: Does anyone know what could be causing this error to occur? Every time we connect this unit to IEEE, it causes this error and does not allow other devices to be detected on the IEEE chain. This screenshot is of NI IO Trace watching the unit as it goes through the INT when you open a Met Cal Runtime.

author: alm
author_rank: Super Contributor
timestamp: May 04, 2024, 10:04:35 am
content: Have you tried sending *IDN? from NI MAX? Have you tried connecting it to a separate GPIB bus using for example a USB-GPIB adapter? Does it work via other interfaces than GPIB? I find it odd that the commands seem to fail immediately despite the timeout being set to 1s and even 10s.

author: Louis_C
author_rank: Contributor
timestamp: May 04, 2024, 06:59:53 pm
content: When you send the INT to the 8846, it gives the proper string when queried. It's when you try and run ANY runtime procedure, it dumps the error code and the other devices in the IEEE chain stop as well. Procedure stops and throws an error. It does NOT go SRQ high though.

author: m k
author_rank: Super Contributor
timestamp: May 04, 2024, 07:29:08 pm
content: Can you send other single respond commands?Something where the machine has a bit more to do than just an ID.
Keysight 34450A Help - Page 1
Forum section: electronics / testgear

author: Louis_C
author_rank: Contributor
timestamp: May 03, 2024, 05:57:23 pm
content: Hello all. I'm looking for some help on a Keysight 34450A. All calibration tests pass except for 100mV AC @ 100kHz. It reads 94.837. The Low limit is 96.700 and the high is 103.3. I tried performing the internal calibration and entering the new corrected reading for this test point and the unit rejects it and fails. I flashed the firmware to the latest version available ( 01.03-01.02). I'm not sure what else to do here. Can anyone give me some advice as to what to look at next? Thanks!

author: Eraldo
author_rank: Regular Contributor
timestamp: May 04, 2024, 12:31:18 pm
content: Honestly speaking, as long as the devicevis within spec with the other ranges i see no reason to try and fix that specific range which you will rarely, if not ever use at that high of a frequency (assuming it's within spec for lower frequencies)Also i saw that you have been asking this question in other parts of the forum and duplicate posting is frowned upon.
Rigol DG800 Combining waveform with arbitrary waveform - Page 1
Forum section: electronics / testgear

author: eTobey
author_rank: Super Contributor
timestamp: May 02, 2024, 04:05:46 pm
content: Hi,i just unpacked my Rigol DG812 and had a bit of a play with it.I can not figure out, how i can set the arbitrary waveform, when combining it with another waveform. It does add the arbitrary waveform, but there is no option to choose.The manual did not help here.The firmware is 00.02.06.00.01 which i could not find a newer version of it.Anyone has used this feature?

author: thm_w
author_rank: Super Contributor
timestamp: May 02, 2024, 10:45:48 pm
content: As mentioned in the manual:- Tap the Channel desired in the bottom left of the screen- Select CombineSet to On- Choose your waveform to combine with, settings desired, etc.- This function is only valid for the basic waveforms.If you want to choose Arb, choose that as the main waveform and then combine it with something else. I don't know if you can do Arb with Arb, I guess if you combine CH1 and CH2 then thats the only option?https://beyondmeasure.rigoltech.com/acton/attachment/1579/f-08a5/0/-/-/-/-/DG800_UserGuide_EN.pdf

author: eTobey
author_rank: Super Contributor
timestamp: May 03, 2024, 05:30:24 am
content: Quote from: thm_w on May 02, 2024, 10:45:48 pm- check- check- check... wait i cant choose the arb waveform. Its just the on i have used before.The manual is from July 2018, which is also the one i have found.

author: thm_w
author_rank: Super Contributor
timestamp: May 03, 2024, 09:26:08 pm
content: Quote from: eTobey on May 03, 2024, 05:30:24 amYou understand this part right? "This function is only valid for the basic waveforms."If you want Arb then set your channel 1 as the Arb waveform and combine with something else (square, sine, etc.) shown here:If you want Arb with Arb, then you can try to combine channel 1 and channel 2.

author: eTobey
author_rank: Super Contributor
timestamp: May 04, 2024, 08:36:05 am
content: I can combine a sine with arb, no problem. Its just that i cant select the kind of arb. If it is not intented to add arb to a basic waveform, then i consider this a bug that is actually a feature.But i figured out a way:Choose arb as normal waveform of the kind you want. Then choose the waveform you want to add the arb to. Then go to combine and choose arb. Et voila: You successfully combined a waveform with and arb waveform.
MSO5102D Block... - Page 1
Forum section: electronics / testgear

author: zol
author_rank: Newbie
timestamp: May 04, 2024, 12:12:09 pm
content: Hello to all...!After a bad firmware upgrade , my MSO5102D is stuck at the beguinning start cycle : at switch ON appears the blue screen with strips of different colors ( as usual ) but suddenly turns black with some little dots at top and, after some seconds, start again with the blue screen ( in an eternal loop...).I have attached a serial-usb converter inside the circuit internal ( after some intense search info ) and I have the initial boot log (attached to this message) (I guess is well attached...)The serial number is : T 1G/012 009551The soft version is : 2.07.1 ( 130321.0 )The hard version is : 10070x555583e9Of course I don't have any backup of the original Filesystem...!!I guess some upgrade of a correct image or some important files are needed to turn the MSO to life....Any help is well received ....!...and thanks in advance too...!!!Zol