hybridfree/eevblog-posts huggingface dataset:
Interesting BK Precision scopes - Page 1
Forum section: electronics / testgear

author: echen1024
author_rank: Super Contributor
timestamp: January 29, 2014, 02:49:49 am
content: Is there anyone who knows the OEM to this BK Precision? It has a decent arbitrary generator, and the scope has acceptable specs. I wonder, if there is an OEM, and it can be purchased, will this become a new standard for the ultimate budget lab?http://www.bkprecision.com/products/oscilloscopes/2540B-GEN-60-mhz-1-gsa-s-digital-storage-oscilloscope.html

author: GiskardReventlov
author_rank: Frequent Contributor
timestamp: January 29, 2014, 02:57:40 am
content: As you probably saw here:https://www.eevblog.com/forum/buysellwanted/scopes-on-ebay-questionable/msg377231/#msg377231The 100MHz model can be bought for $674 plus shipping, seems like a good deal but I don't know if they're made by BK or not. Someone needs to do a teardown on these.

author: Bored@Work
author_rank: Super Contributor
timestamp: January 29, 2014, 03:04:11 am
content: Quote from: echen1024 on January 29, 2014, 02:49:49 amTonghui.

author: sync
author_rank: Frequent Contributor
timestamp: January 29, 2014, 03:06:24 am
content: http://www.tonghui.com.cn/en/goods/index/122.htmlWhen tried to download the specification I got this

author: Co6aka
author_rank: Unknown
timestamp: January 29, 2014, 03:15:28 am
content: Quote from: sync on January 29, 2014, 03:06:24 amAah, I see the problem...

author: GiskardReventlov
author_rank: Frequent Contributor
timestamp: January 29, 2014, 03:19:00 am
content: Never heard of tonghui what other names are put on these scopes?http://tonghuielectronic.en.alibaba.com/product/398255339-211880280/100M_Digital_Storage_Oscilloscope_TDO2102A.html

author: echen1024
author_rank: Super Contributor
timestamp: January 29, 2014, 03:41:06 am
content: For $560, you get a 60MHz 1GS/s, 2.4Mpts scope and a 25MHz arb gen. Not a bad deal after all.http://item.taobao.com/item.htm?spm=a230r.1.0.0.Z8ZhpK&id=24087740089
DSO FFT Noise Floor for 100MHz -2dBm (0.5Vpp) sine wave (easy or painful ?) - Page 1
Forum section: electronics / testgear

author: rfbroadband
author_rank: Unknown
timestamp: January 29, 2014, 06:10:55 am
content: After my response to the DSO vs SA post, I thought maybe it would be interesting for people to share how easy (or painful) it is to setup their scope to display the frequency response of a 100MHz sine wave at 0.5Vpp trying to get the noise floor as low as possible. I have used many scopes and almost all of them had a terrible FFTs and FFT GUIs and implementations. On some of them (even Agilent), if you don't select the correct combination of parameters (sampling freq, memory depth, number of points etc) the screen simply went blank. If you think this is an interesting experiment, please share your experiences on setting up your scope to display a simple spectral component of a 100MHz signal at 0.5Vpp (-2dBm) in the frequency domain with the noise floor reduced as much as possible. Upload a screen shot.Attached the screen shot of a R&S RTO scope. Setup was very easy, because the scope FFT mode GUI behaves like a spectrum analyzer...

author: nctnico
author_rank: Super Contributor
timestamp: January 29, 2014, 10:58:57 am
content: After some fiddling my TDS744A does ok. When set to high-res, long record length and averaging the FFT results it works albait a bit slow.

author: TomThomas
author_rank: Contributor
timestamp: January 29, 2014, 12:31:09 pm
content: Quote from: rfbroadband on January 29, 2014, 06:10:55 amShort comment on RTOs FFT:There is a big difference between RTOs FFT and a let me say classical DSO FFT. R&S use a DDC (digital downconverting) technique before calculating the FFT and they added their experience from their SAs. So you get a great FFT ... but you have to pay for that...
UNI-T UTD2042C possible Hack?? Serial Commands!?? - Page 1
Forum section: electronics / testgear

author: vandersonpc
author_rank: Contributor
timestamp: January 29, 2014, 10:19:19 am
content: Hi Guys,I teardown My UNI-TREND UTD2042C 40Mhz scope and found it uses the same board than UTD2102, a 100MHz model from the same manufacturer. I tried to apply the same commands described on the Rigol DS1052 hack, but it didn't work. Looks like the Uni-T units are not compatible with the IEE488 commands. I tried to install the UTD2102 firmware, but the unit refuses to get it and show a message that firmware is not compatible with the current unit.So, have you guys any experience hacking this UNI-T units? Or know which serial protocol it uses?Or how to change the model number through USB or RS232!?Please, any help you very much appreciated!Many Thanks!Cheers, Vanderson

author: Rerouter
author_rank: Super Contributor
timestamp: January 29, 2014, 10:42:25 am
content: as its a different unit and very likely to be a different firmware variant to the rigol your likely going to need to start out at square one with finding out what the differences are between the 2 firmwares,

author: vandersonpc
author_rank: Contributor
timestamp: January 29, 2014, 10:57:13 am
content: Yes, my first thought was that the UNI-T units were compatible with IEE488 as the Rigol Units are. Even Tektronics, Agilent, etc. which have a programming manual for they units.My UNI-T UTD2042 uses the same MCU than Rigol units (Analog Devices ADSP-BF531) and the same Altera Cyclone FPGA, but I know the Rigol firmware is not compatible with my unit.Cheers, Vanderson
Purpose of Page and Count in Logic Analyzer (Logic Cube) - Page 1
Forum section: electronics / testgear

author: spinnaker
author_rank: Regular Contributor
timestamp: January 29, 2014, 01:42:06 am
content: I have a Logic Cube Logic Analyzer. The help file is extremely poor. I have looked for both Count and Page in regard to trigger but found nothing. I would assume that count would be that it triggers on the Xth trigger. Is this correct? If not what is it?What is the purpose of Page?
Low thermal EMF Test Leads - Page 1
Forum section: electronics / testgear

author: iTist
author_rank: Contributor
timestamp: January 28, 2014, 08:51:07 pm
content: Hi,where can i get low thermal EMF Test Leads (4mm) for my DVM ? Or is it possible to make them at home.Thanks in advance.GreetzOliver

author: Jay_Diddy_B
author_rank: Super Contributor
timestamp: January 28, 2014, 09:19:35 pm
content: Hi,Have a look at this thread:https://www.eevblog.com/forum/buysellwanted/diy-low-emf-cable-and-connectors/I use these Pomona leads:http://www.pomonaelectronics.com/pdf/d5291a_1_01.pdfJay_Diddy_B

author: robrenz
author_rank: Super Contributor
timestamp: January 28, 2014, 09:33:43 pm
content: Just remember that the material your meters jacks are and what they are plated with are going to form a thermocouple with whatever material the "low thermal EMF leads are terminated with. And that will occur with whatever is connected on the other end also.
Lascar Power Supply - Page 1
Forum section: electronics / testgear

author: Einsteins_Ghost
author_rank: Newbie
timestamp: January 27, 2014, 09:21:15 pm
content: Hi All,I am curious if there are any opinions about the Lascar power supply:http://www.amazon.com/gp/product/B0008D5FZ4/ref=ox_sc_act_title_4?ie=UTF8&psc=1&smid=A15XFZ7B3RNOXMWe used these at work and they are just great little guys. The thing that strikes me as odd is that their form factor is so compact and this sets them apart from all other PS units that I have seen in this price range.Since I cannot take apart the ones at work (without just cause) I was considering buying one and taking it apart to compare it to, say, the Korad or something in the sub $100.00 USD range.Rated: 30V @ 1.5A.... GREAT for hobbyists and low power designs!Cheers!!-"Spooky action at a distance"
Ordered The Agilent U1273A - Page 1
Forum section: electronics / testgear

author: tony3d
author_rank: Frequent Contributor
timestamp: January 27, 2014, 09:54:46 pm
content: Hi All, Thanks for all your help In my decision to buy a new Multimeter. This will be my first really high quality meter. I really wanted the U1272A, but TEqupment could not get it for me. They could get either the U1271A, or The U1273A. For the price I got it at I couldn't resist going all the way! $375.96! The display battery life really won't be an issue for me, as I'm only using on my hobby bench. I really like the Agilent features, the fact it has easy access to fuses, comes with calibration certificate, and the fact it is 30000. Finally should have a decent reliable meter! If for some reason I don't like the display, Beth said I could simply return it within 30 days. TEqupment seems very nice to deal with. The I got charged no shipping, no tax, and got the EEVBlog discount was great! Thanks to you guys, I wasn't even aware of that discount. So anyone that has this meter, I'd like to hear the pro's, and con's. I know it's a bit late, but what the heck.
Busted Tek TDS1001C-EDU - Page 1
Forum section: electronics / testgear

author: katzohki
author_rank: Frequent Contributor
timestamp: January 17, 2014, 10:14:05 pm
content: Apparently one of our techs at work fed his scope a little too much voltage. We test high voltage products here and he thinks he had a transient spike up to 6000V during a stability test. I doubt his front end saw near that much since we use a 1000:1 divider, but still it does seem to be busted.It powers on and eventually just sits at a blue screen that tells me the model number and serial number and probably firmware revision. So to me it seems like it self tests and then stops when trying to communicate with what they call the "main board" in the service manual. I guess I was thinking I'd find something in the input stage and just replace it, but I don't have any experience with Tek's digital scopes.What do you guys think? Is it worth bothering with? Or should I just toss it?

author: PedroDaGr8
author_rank: Super Contributor
timestamp: January 18, 2014, 12:34:01 am
content: Its quite possible that he killed the input stage but its also quite possible that its a coincidence. Most of these tend to be pretty difficult to repair unless you find something simple. Its up to you on what you want to try and if it's worth your time.If all else fails you can give it to me rather than tossing itI'd love to play with trying to fix it. heck I'd love just tearing it down even if its FUBAR.

author: katzohki
author_rank: Frequent Contributor
timestamp: January 27, 2014, 06:25:16 pm
content: Looks like they decided to send it out for repair. I suggested they find out if a new one will be cheaper, of course.
Nitrate test meter - Page 1
Forum section: electronics / testgear

author: akis
author_rank: Frequent Contributor
timestamp: January 26, 2014, 02:35:42 pm
content: HiDoes anyone know the basics/basis of how to test water for nitrates - usually it is a figure given in parts per million, ppm for short.There are a couple of handheld meters on the market but they are prohibitevely expensive for the hobbyist aquarium keeper!If we had a schematic or some basis of operation we might be able to design something. It does not need to be 0.1% accurate, even 10-20% will do just fine.Many thanks

author: kripton2035
author_rank: Super Contributor
timestamp: January 26, 2014, 02:58:56 pm
content: the probe itself makes the price of the meterjust poking around shows a good electrode is some $250then it's only a 0-200mV measurementI dont think you can make a DIY probe for that.http://www.frederiksen.eu/uploads/tx_tcshop/media/CI-6735.pdf

author: akis
author_rank: Frequent Contributor
timestamp: January 26, 2014, 03:10:53 pm
content: OK thanks. It appears complicated and convoluted enough even with the ready made probe!I have bought a "total disolved solids" TDS meter very cheaply on ebay which measures ppm of total dissolved solids in water and it seems to be correct. Tap water measures at about 220-250 ppm, mildly filtered water at about 200ppm, and water coming out of my RO filter unit at just 15ppm!I do not know how the TDS meter works but I thought the Nitrate meter would be just as simple

author: SeanB
author_rank: Super Contributor
timestamp: January 26, 2014, 03:36:10 pm
content: TDS meter works by using some carbon electrodes to measure the conductance of the water. Simple to do and calibrate, and no parts to wear out, the calibration is simple to do and the dimensions of the cell are easy to measure to calculate the output.The nitrate and such kits use the water as part of a chemical cell that makes a small voltage that is proportional to concentration. You need a specific set of electrode materials, reagents that only respond to the specified chemicals that you are interested in, a temperature sensor to provide compensation and a micropore filter to allow the reagents to contact the water. All consumable materials that are both hard to make and use with the required purity at home easily.

author: kripton2035
author_rank: Super Contributor
timestamp: January 26, 2014, 03:38:50 pm
content: diy tds meter here :http://www.octiva.net/projects/ppm/

author: PeterL
author_rank: Regular Contributor
timestamp: January 26, 2014, 08:19:41 pm
content: You could also use this device:http://www.iorodeo.com/colorimeterMeasuring Nitrate in an aquarium is quite a complex proces with this device, but described here in detail:http://public.iorodeo.com/docs/colorimeter/lab_3.html

author: GeoffS
author_rank: Unknown
timestamp: January 27, 2014, 01:50:34 am
content: Cheapest place I've found for these sort of sensors isAtlas Scientific.I was looking at their dissolved oxygen sensor, not sure if they also have nitrate detection.
power supply  - Page 1
Forum section: electronics / testgear

author: R_G_B_
author_rank: Frequent Contributor
timestamp: January 27, 2014, 04:15:05 pm
content: Does anyone know where I can get dual rail power supply for around £100. I have seen a linear power supply on maplins website looking for something that can give + - 12vTo power op amps etc.Any good:http://www.maplin.co.uk/p/375w-linear-dc-variable-voltage-bench-power-supply-rp10l

author: N2IXK
author_rank: Frequent Contributor
timestamp: January 27, 2014, 04:32:48 pm
content: That one looks to be a single supply, not dual output. And FAR more current than you need for typical opamp circuits, with no current limiting circuit to dial it down. That looks like it is intended for servicing car stereo gear and the like, high current 12V stuff.For a bench supply for opamp prototyping, you want something more like this:http://www.amazon.com/Mastech-HY3005F-3Triple-Linear-Power-Supply/dp/B004ISD7T6/ref=sr_1_1?s=industrial&ie=UTF8&qid=1390840325&sr=1-1

author: nanofrog
author_rank: Super Contributor
timestamp: January 27, 2014, 06:22:07 pm
content: You're in luck.Topward Electric Instruments TPS-4000 Dual Tracking 0-30v 0-3a DC Power SupplyThurlby PL310 K1 Module. (274)Farnell stabilised power supply L30AT AC/DC Power SupplyAll 3 are dual output @ 30V each (tracking capable, which is what you'll need),notlisted as "parts" units, and sellers have a return policy.Hope this helps.
Agilent EL display panel "upgrade" to LCD, etc? - Page 1
Forum section: electronics / testgear

author: Co6aka
author_rank: Unknown
timestamp: January 25, 2014, 07:00:07 pm
content: Would like to ditch the EL panel in my E4438C for something easier on the eyes. Not finding anything on the web (lotta noise, no signal.) Anyone familiar with the type(s) of panel Agilent used, the interface, and etc? (Haven't torn it down yet; too much going on that I need it for right now, so... I'm a beggar.)
Siglent sdg805 arbitrary wave form generator good choice? - Page 1
Forum section: electronics / testgear

author: electronics man
author_rank: Frequent Contributor
timestamp: January 23, 2014, 05:19:30 pm
content: I am looking to buy a function generator or arbitrary waveform generator for und £215 deliverd is the sdg805 a good choice, it looks good value for money for me but I'm not an expert. Does any one know of a better one for that price or lower.

author: electronics man
author_rank: Frequent Contributor
timestamp: January 24, 2014, 08:07:50 pm
content: Does someone have an answer it is quite urgent!!!!!

author: commongrounder
author_rank: Frequent Contributor
timestamp: January 24, 2014, 08:32:05 pm
content: That series is pretty new, so there may not be very many users yet. I have the SDG1000 series unit (dual output version). I like it, its very flexible, but it has its quirks (firmware revisions are improving things). Looking at the specs, the SDG800 series seems to have less jitter (500ps) in the pulse and square outputs than the 1000 series. More like the SDG5000 series units. At the time I purchased mine, it was the best value I could find in an AWG. If you end up getting one, let us know how you like it.

author: electronics man
author_rank: Frequent Contributor
timestamp: January 24, 2014, 08:36:58 pm
content: Thanks so much for you response I think i will get it it does look very good for its price.

author: echen1024
author_rank: Super Contributor
timestamp: January 25, 2014, 03:47:06 am
content: Ask around. I asked Agilent and they kindly donated a 33120A generator. Much better than whatever Chinese stuff you get. maybe old universities, schools, labs, etc...

author: electronics man
author_rank: Frequent Contributor
timestamp: January 25, 2014, 05:08:36 pm
content: Quote from: commongrounder on January 24, 2014, 08:32:05 pmI have just ordered it from siglent eu I will (try to)do a full review of it when I get it won't be a wile though.
New UNI-T Products - Page 1
Forum section: electronics / testgear

author: echen1024
author_rank: Super Contributor
timestamp: January 24, 2014, 07:39:40 pm
content: I see some new products on the Uni-T site.I see the UT2000 series function generator, which looks a lot like the Rigol DG1000Z series, minus the 16Mpts memory:http://translate.google.com/translate?sl=auto&tl=en&js=n&prev=_t&hl=en&ie=UTF-8&u=http%3A%2F%2Fwww.uni-trend.com.cn%2Fcp-show.asp%3Fyy%3D%E4%B8%AD%E6%96%87%26ProductNO%3D723&act=urlDepending on the price, this might become a pretty good deal.Also, I see 2 new, probably very expensive, oscilloscopes the 5000 and 8000 series. Both top out at 1GHz, but are 2 channels only. The 5000 series has, holy hell, 128Mpts of memory and 20k wfm/s.The 8000 series is much less impressive, but has touch. Not sure where UNI-T wants to go with these. No serial decoding, but there is DPO functionality.More excitingly, we seem to have one of the first Chinese manufacturers of IR cameras. The 640x480 sensor, however, is imported.It seems as if you need to look at these on the Chinese site, not the English one.

author: true
author_rank: Frequent Contributor
timestamp: January 25, 2014, 02:30:31 am
content: Your link to the function generator points to the 8000-series scope.

author: echen1024
author_rank: Super Contributor
timestamp: January 25, 2014, 03:32:04 am
content: Oops. Sorry.

author: iloveelectronics
author_rank: Frequent Contributor
timestamp: January 25, 2014, 03:47:41 am
content: Quote from: echen1024 on January 24, 2014, 07:39:40 pmThe 8000 series is less impressive in terms of memory size (24k vs 128M) and sampling rate (1G/s/ch vs 5G/s total), but it features intensity grading. Uni-T calls them "3D scope", the 3rd dimension being the intensity. It is not mentioned on the brochure, but I have seen it being advertised on some Chinese websites.

author: echen1024
author_rank: Super Contributor
timestamp: January 25, 2014, 03:51:52 am
content: Can you get prices for any of these?

author: iloveelectronics
author_rank: Frequent Contributor
timestamp: January 25, 2014, 04:16:33 am
content: Quote from: echen1024 on January 25, 2014, 03:51:52 amThe UTD8062C (60MHz) is about 5,000 RMB on Taobao, which is about US$830. The UTD5062C (600MHz) is 21,500 RMB (about US$3,570). Huge difference in prices, which is to be expected due to the vast difference in bandwidth and sampling capabilities. And of course these are prices in China. As Uni-T doesn't seem to have many overseas distributors to buy them from China you will need to factor in shipping costs too.

author: Wytnucls
author_rank: Super Contributor
timestamp: January 25, 2014, 05:01:01 am
content: Most of the stuff was in the 2013 catalogue already:https://www.eevblog.com/forum/testgear/uni-trend-2013-catalogue/
Fluke 101 Multimeter Teardown - Page 1
Forum section: electronics / testgear

author: dexters_lab
author_rank: Unknown
timestamp: January 21, 2014, 10:47:57 am
content: picked up one of these Fluke 101 to sit in my toolbox, thought it'd take it apart and share.Bought from Ebay, £42.00 including the shipping

author: Wytnucls
author_rank: Super Contributor
timestamp: January 21, 2014, 12:30:34 pm
content: It doesn't measure currents but it has a 13.8V 750mA fuse (LF075) on the positive side of the battery connector, followed by a beefy diode (zener?) to protect the circuitry.http://www.tripac.com.tw/pdf/passivecomponent/LITTELFUSE/1812L.pdf

author: dexters_lab
author_rank: Unknown
timestamp: January 21, 2014, 03:30:49 pm
content: i have to say i am quite impressed for the money especially on the inside. Though there is no replaceable fuse, but i guess at this price point if you fry it, just buy a new one.range switch has a good feel to it, the display is nice and clear. Continuity test is latching and fairly quick but does miss a few flicks if you do it quick enough. The test leads are nice and long with a rubbery grip feel to them with fluke branding.biggest downside is it's not True RMS

author: dexters_lab
author_rank: Unknown
timestamp: January 21, 2014, 03:41:04 pm
content: sorry to all, i had not noticed a similar teardown had been posted up before by awardcat last year, i did search but it didn't show up!

author: Wytnucls
author_rank: Super Contributor
timestamp: January 21, 2014, 04:12:38 pm
content: The test leads and probes are too big for the meter really. I replaced them with a set of leads I had lying around, which are shorter and smaller, for convenience. Of course, for high energy stuff, the original leads should be used.The meter is well protected and will have to be subjected to some serious mishandling before it expires.

author: retiredcaps
author_rank: Super Contributor
timestamp: January 21, 2014, 05:20:31 pm
content: Quote from: dexters_lab on January 21, 2014, 03:41:04 pmNo need to apologize because I like seeing another set of clearly focused photographed pictures from a different angle or perspective as it may help identify components for future repairs.

author: BravoV
author_rank: Super Contributor
timestamp: January 21, 2014, 05:36:19 pm
content: Quote from: retiredcaps on January 21, 2014, 05:20:31 pm+1 , and also possibilities of seeing different versions, thanks for sharing btw.

author: zapta
author_rank: Super Contributor
timestamp: January 24, 2014, 06:15:37 am
content: Quote from: dexters_lab on January 21, 2014, 03:41:04 pmThe more, the better ;-)I have a similar one (107) and love the small size. The 101 is even smaller.

author: dexters_lab
author_rank: Unknown
timestamp: January 24, 2014, 05:05:59 pm
content: i have a 107 on order as well to replace my old Mastech
So, I won multiple Logic Analysers on e-Bay. - Page 1
Forum section: electronics / testgear

author: stabilize
author_rank: Newbie
timestamp: January 24, 2014, 09:28:21 am
content: Hello, I am new here, from the UK and can finally afford to start buying all the electronics goodness...Anddd that is exactly what I did, I won 3 Logic analysers on e-bay dirt cheap complete with pods and case's.I will mostly likely only be keeping 2 of them (depends if I love them all) but just wanted to know if anybody has had any experience with them. They as follows:1. Philips Fluke PM3585 Logic Analyzer 200MHz with Pods.2. HP 1651B Digital Logic Analyzer 32 Channel 100MHz with Pods.3. AGILENT 1630D LOGIC ANALYZER with Pods.I was bidding on a few oscilloscopes but I believe they are in higher demand and were more aggressively bid on.Should I be wary of anything on these (common issues/problems etc).ThanksStabilize
Owon SDS8202 vs SDS-8202V?  - Page 1
Forum section: electronics / testgear

author: cswilsn
author_rank: Contributor
timestamp: January 23, 2014, 02:25:01 am
content: Hello Again Everyone.Well, I broke down and bought a Tek TDS2024 while on the road to finding a decent Chinese scope. I'm going to take the plunge though and grab an owon, mainly because I know I really wont care if I kill it in the field, and the battery option is nice.Can anyone possible details the differences between the Owon SDS-8202 and SDS-8202V?From what I can gather, I think one has a RS-232 port and the other does not?Any more insight into this unit would be great, I've been gathering information for the past 5 days on these units as I can...and a lot of stuff seems to be a contradiction of others.

author: AndrejaKo
author_rank: Frequent Contributor
timestamp: January 24, 2014, 07:20:35 am
content: Main problem here is that Owon constantly keeps changing their scopes, so there are several versions of each scope with slightly different performance.As far as I remember, only units from 2011 had serial port. All new units (as in 2012 and 2013) have USB host and device ports and a LAN port. In addition to that, the V versions have a VGA port. That's the only difference there is.Also you can always ask in the Owon SDS7102 thread, it contains a lot of information on the whole series and internally most of the scopes in SDS series are more or less the same. I myself am using an SDS7102, mostly because the V version was not available in my region.
Question about Hantek DSO5102B - Page 1
Forum section: electronics / testgear

author: bogdan2013
author_rank: Regular Contributor
timestamp: November 03, 2013, 06:13:07 pm
content: Hello all !I don't know why at 200 us time base I can't acces 1M memory depth . Know someone ? Not a problem for me , just for curiosity . I have the latest firmware (2.06.3) .P.S. : I don't found anything about memory depth in Help menu .Thanks !

author: tinhead
author_rank: Super Contributor
timestamp: November 03, 2013, 06:41:07 pm
content: there is nothing "wrong", by design (so since the first DSO from that platform in 2009) there is no 1M when in 200us/DIV and no 2M (for models with 2M) when in 400us/DIV. It looks like they can't scale the buffer to screen width/given samplerate.So yeah, it is like that.

author: bogdan2013
author_rank: Regular Contributor
timestamp: November 03, 2013, 06:52:58 pm
content: I understand . Thanks !

author: Hydrawerk
author_rank: Super Contributor
timestamp: November 03, 2013, 08:00:55 pm
content: These Tekway (=Hantek) scopes have always been strange. Well, Tekway has never been a large test equipment company as Rigol or Siglent... Tekway just produces one type of scopes still very similar to the 2009 design... In 2009, it was good. There were no Rigol DS2000 or Owon SDS7102.

author: bogdan2013
author_rank: Regular Contributor
timestamp: November 03, 2013, 09:38:18 pm
content: Not bad those scopes , really . Those over/under shoots are fixed , same for overtime at triggering , but still have problems with that very slow response time at long memory depth . If you turn on all channels , put 512K memory depth and you try to ajust the trigger level it locks . I hope is just the software .

author: limpid
author_rank: Contributor
timestamp: January 22, 2014, 08:45:15 am
content: aha
selector - Page 1
Forum section: electronics / testgear

author: GEuser
author_rank: Frequent Contributor
timestamp: January 17, 2014, 04:52:33 am
content: Q

author: Macbeth
author_rank: Super Contributor
timestamp: January 22, 2014, 07:56:12 pm
content: Pic 5 - have they really split, or are they designed this way? I mean electrically they are all the same contact point. I imagine Won Hung Lo in charge of copper contact springs realised he could save $0.000000001 by having those open to begin with!

author: Lunasix
author_rank: Regular Contributor
timestamp: January 22, 2014, 08:09:16 pm
content: It could be done to have each contact independant in motion from the other ? Not the case when the spring is modified with solder.
worlds cheapest osilloscope - Page 1
Forum section: electronics / testgear

author: electronics man
author_rank: Frequent Contributor
timestamp: January 22, 2014, 06:04:32 pm
content: i have just found this scope is this the cheapest scope on the markethttp://www.techsupplies.co.uk/epages/Store.sf/en_GB/?ObjectPath=/Shops/Store.TechSupplies/Products/OSC001I may just buy it to see if it is worth the £9.99 probably not.

author: Rick Law
author_rank: Super Contributor
timestamp: January 22, 2014, 06:33:37 pm
content: Quote from: electronics man on January 22, 2014, 06:04:32 pmYeah, keep us posted. Some cheap toy to poke around is always fun.

author: Maxlor
author_rank: Frequent Contributor
timestamp: January 22, 2014, 06:54:52 pm
content: Seems a bit of a stretch, calling that an oscilloscope. Like calling an electric wheelchair a car. It has 4 wheels, a motor, rudimentary steering and it transports people... but that's not quite enough.
Rigol DS1102E issues - Page 1
Forum section: electronics / testgear

author: rexxar
author_rank: Frequent Contributor
timestamp: January 18, 2014, 11:20:41 pm
content: Hi all, I just got a DS1102E, and I've noticed a few annoying bugs. First, when you press the multi-function knob to select something, it sometimes doesn't register the key up event, and the help screen pops up. And occasionally when you turn the position knobs fast enough, it will jump backwards. I'm not sure if this is a firmware bug or not. I sent Rigol a message, and they just offered to send me a replacement. Has anyone else seen these issues?I'm not sure what the current firmware version is, but I've got 00.04.01.00.02.

author: Maxlor
author_rank: Frequent Contributor
timestamp: January 19, 2014, 12:10:37 pm
content: I haven't encountered any skipping or misinterpretation of steps when turning the knob so far. Missing of the key-up event and subsequent help display I've encountered once or twice, but it's very rare.

author: GiskardReventlov
author_rank: Frequent Contributor
timestamp: January 21, 2014, 09:45:19 pm
content: Can this scope be gently coerced into a 200Mhz model? There was LONG thread on this meter but I couldn't extract that data. Or did Rigol kill the customer-engineered upgrade feature?This looks like a great scope.
BK Precision 886 vs BK Precision 879B - Page 1
Forum section: electronics / testgear

author: mikec
author_rank: Contributor
timestamp: January 19, 2013, 08:39:44 pm
content: HiNew to this forum, I've been hanging about on youtube watching Dave's videosand I've gradually found my way here!! Great stuff, I may also head to the blogs later!I had a question about the BK precision LCR Meters:1. The 886 states that it can measure Ls, Lp, Cs and Cp.. Now the 879B doesn't specify it however when reading the table specs there is a mention of parallel and serial measurements. Can anyone confirm it can perform Ls, Lp, Cs and Cp. It appears to have all the other functionality of the 886 besides from what I can see. How important are these parameters?2. The 886 is clearly an older model, although still available. It also has a basic accuracy of .2% versus .5% for the 879B. Also looks like it can do 100kHz test frequency versus max 10kHz for the 879B. (the 885 part of the 886 family has a max of 10kHz). However looking on Amazon the older 886 and the 885 are more expensive than the 879B by $300 to 400$ which is hugh in my opinion. I am a bit lost as to how and explain this difference, although I am guessing that in critical apps the .2% is a good start. But I also have to bear in mind that the 879B offers the modern USB interface and PC software features etc.I guess there are 2 parts to this question.Can anyone explain the most critical feature that is keeping the older 886 at its high retail price?And if faced with the decision to purchase one of these 885 for around US$250 on ebay is the older model in this case worth the money (an 879B? costs about US$269I happen to notice I believe an even older model 875B is about US$30 less than the brand spanking new 879B... at least it is good to know that these test instruments hold their value.http://www.ebay.com/itm/BK-Precision-875B-LCR-Meter-/190784372961?pt=LH_DefaultDomain_0&hash=item2c6ba280e1Regards,Mike

author: Telimage
author_rank: Newbie
timestamp: January 21, 2014, 12:13:06 am
content: https://www.eevblog.com/forum/Smileys/default/confused0024.gifNo reply? I am also in the market for an LCR/ESR meter and would really like to see someone come up with an intelligent answer.

author: PedroDaGr8
author_rank: Super Contributor
timestamp: January 21, 2014, 05:27:31 am
content: I can't check those out on phone but the most commonly recommended model of LCRright now is the Der EE DE-5000. It's the OEM for the IET labs model. Check it out and see if it matches the specs you want.Sent from my EVO using Tapatalk

author: GreyWoolfe
author_rank: Unknown
timestamp: January 21, 2014, 02:11:54 pm
content: I just got the DER EE and am learning how to use it. Here is a link:http://www.ebay.com/itm/DE-5000-LCR-Meter-With-TL-21-TL-22-TL-23-DER-EE-/231129161138?pt=LH_DefaultDomain_0&hash=item35d05f1db2If you are not interested in connecting it to a computer. If you are, then get the plain meter for about $93 shipped and this kit:http://www.ebay.com/itm/TL-21-TL-22-TL-23-USB-CD-set-for-DER-EE-DE-5000-LCR-Meter-/161183104369?pt=LH_DefaultDomain_0&hash=item258742fd71It comes in cheaper than the BK meters.
HP 6010A - 1kW adjustable power supply teardown - Page 1
Forum section: electronics / testgear

author: daqq
author_rank: Super Contributor
timestamp: January 20, 2014, 04:46:13 pm
content: So, I took a peek into another one of my tools: The HP 6010A power supply:http://www.daqq.eu/?p=838Enjoy!

author: Jay_Diddy_B
author_rank: Super Contributor
timestamp: January 20, 2014, 05:21:19 pm
content: Hi,There is an article on the HP6012A in the HP Journal. This is a similar product to the 6010A.http://www.hpl.hp.com/hpjournal/pdfs/IssuePDFs/1981-08.pdfI have repaired these units with IRF450 TO-3 MOSFETs.I have a HP6030A 200V 17A 1000W. The HP 6030A is a later version of the HP 6010A.These supplies are flyback supplies. The flyback topology enables the constant power curve.There should be a safety cover over the line connections. May be a job for a 3-D printer?Jay_Diddy_B

author: pomonabill221
author_rank: Frequent Contributor
timestamp: January 20, 2014, 07:19:01 pm
content: WOW what a monster!That piggy back board on the back was kludged on and pretty nasty looking! Also exposes the line input.. not too good.Looks like some of the mods were half as#ed too!Thanks for all the detailed pics and explanation! and the manual!

author: nctnico
author_rank: Super Contributor
timestamp: January 20, 2014, 07:33:12 pm
content: @Jay_Diddy_B: Thanks for the link to the HP journal. I received my HP6012A today (dunno if it works; it needs a thourough cleaning first) and I have two HP6024A PSUs.

author: daqq
author_rank: Super Contributor
timestamp: January 21, 2014, 06:44:26 am
content: Thanks for the journal link, interesting reading.pomonabill221: Normally the board is not exposed, but my unit was missing this part. This is the unit in its normal form:http://www.ebay.com/itm/AGILENT-hp-6010A-DC-POWER-SUPPLY-0-200V-0-17A-1000W-5-/110906129711Still, I don't like it.
Sourcing parts for Tektronix 2445A - Page 1
Forum section: electronics / testgear

author: Nuchaz
author_rank: Newbie
timestamp: January 20, 2014, 02:52:35 am
content: Hello! I've been a long time EEVBlog viewer and lurker, but this is my first post. Hopefully this is in the right area.I just bought Tektronix 2445A off from ebay for $200 and everything on it seems to work great except the intensity knob has been broken off. The shaft of the pot has broken off so it's not usable at all. I'm trying to search for a replacement and was wondering if anyone on here knows of any good places for sources these older parts like this. I would like something as close to the original as I can get, but I don't really want to spend like $20 for a 5K pot and another $15 for a plastic knob. I'll hack in a different style pot/knob if I need to just to get it working, but it would be nice to have it looking original. I am missing the plastic knob all together and the plastic shaft extension piece is broken as well. The pot itself is a clarostat 311-2174-01 5k ohm with USA markings.Does anyone know where I might be able to find the pot and/or knob fairly cheaply?I added a couple pics as attachments here, the first is just a pic of it running. This is actually my first scope and I am really happy with it. I figured I better start with an analog scope as per Dave's advice.Other than the knob, everything seems to work good. In the second image you can clearly see where the pot had broken off. It seems the scope had taken a drop and the intensity pot/knob took the brunt of the damage. The focus / readout intensity / scale illum where all slightly bent too, but I was able to straighten them without a problem.

author: c4757p
author_rank: Super Contributor
timestamp: January 20, 2014, 02:59:11 am
content: These folks have theknobfor $8 and thepotfor $8 as well. The "correct" knob (with the line) is out of stock, but the blank one will fit as well and look practically identical.

author: Nuchaz
author_rank: Newbie
timestamp: January 20, 2014, 08:43:40 pm
content: Thanks!, that looks like a pretty good site for sourcing all kinds of these obsolete parts.
Rigol DS1000D/E - which firmware version changed the waveform format? - Page 1
Forum section: electronics / testgear

author: MartinL
author_rank: Regular Contributor
timestamp: January 20, 2014, 02:12:24 am
content: Hi all,I'm one of the developers of the sigrok project (http://www.sigrok.org/), an open source software suite for all sorts of test & measurement gear. I wrote and maintain the Rigol DS driver for sigrok, which currently supports the VS5000, DS1000 and DS2000 series, as well as the Agilent DSO1000A series, over USB, serial and network connections.We have a small but annoying issue with the DS1000 series support, in that it appears that the data format returned by the:WAV:DATA?command has changed between firmware versions. We can support both formats, but we need to be able to know which to expect for a given device. So we want to know which firmware versions return which format.In early versions,:WAV:DATA?simply returned a block of binary data, 600 bytes for each analog channel or 1200 for the LA channels. We see this e.g. on a DS1052E hacked to DS1102E, running firmware 2.02.In later versions, the block is prefixed by a 10-byte ASCII header e.g.#800000600which indicates the length of the data to follow. This is the same format used in the DS2000 and other later series. We see this e.g. on a DS1102D that shipped with firmware 2.06.Can you please help us out by running this command on your scope, and telling us your firmware version and whether you see a header?If you're running Linux, plugging your scope in by USB and running this python script will probably do the trick:Code:import osdevice = os.open('/dev/usbtmc0', os.O_RDWR)os.write(device, ':WAV:DATA? CHAN1')print os.read(device, 10)You should get either a header of the form#800000600or ten random characters. Tell us your firmware version and which you see!You can also use the RS232 port, simply type in that command and look at the first 10 bytes you get back. You can follow any of the many threads on the forums for how to set up a serial connection to type commands to the scope.We'd be particularly interested in firmware versionsbetween 2.03 and 2.05, as well as3.0 and higher.Thank you!

author: rexxar
author_rank: Frequent Contributor
timestamp: January 20, 2014, 02:46:43 am
content: I got 16 and #800000600. I've got firmware 00.04.01.00.02. This is a not-hacked DS1102E.

author: jfuller000
author_rank: Contributor
timestamp: January 20, 2014, 07:46:03 am
content: I got #800000600 with firmware 00.03.01.00.00 on a DS1102E (unhacked).

author: Vtech
author_rank: Regular Contributor
timestamp: January 20, 2014, 01:30:47 pm
content: I got #800000600 with firmware 00.03.01.00.00 on stock DS1102D

author: MartinL
author_rank: Regular Contributor
timestamp: January 20, 2014, 02:16:11 pm
content: Thanks folks. I also now have a report of a header on version 2.04, so it looks like 2.04 and upwards all have it, 2.02 and below do not.The only version I'm not sure about would be 2.03, but it doesn't look like such a version was ever released - I can't find any reference to it anywhere.
Rigol DG3101A Waveform Generator hack? - Page 1
Forum section: electronics / testgear

author: Audioeejit
author_rank: Newbie
timestamp: January 19, 2014, 11:00:41 pm
content: Hi. I use the Rigol DG3101A waveform generator that has a frequency limit of 100Mhz. Since it came out at the same time as the early Rigol scopes and produce software generated waveforms, it seems reasonable to assume that it could be hacked to meet the 120MHz limits of its sister generator. Has anyone had a look at the firmware within this unit?Sent from my iPad using Tapatalk
Fluke serial number decode - Page 1
Forum section: electronics / testgear

author: cio74
author_rank: Regular Contributor
timestamp: January 19, 2014, 07:02:24 pm
content: Hello,Just wondering if someone can decode the year /month of production of the fluke equipment, I have two Fluke 289 and both stats with '9' and in the menu it says calibrated 2009, which I ssume is the year they have been produced also?Can you determine Fluke year by serial number?Thanks.

author: Vuk
author_rank: Newbie
timestamp: January 19, 2014, 09:33:22 pm
content: If calibration counter is 1 then calibration date is when unit was mnf. (or couple of days before). Unless your unit was repaired and main board was replaced.
Agilent 33410A Noisy Fan or Normal? - Page 1
Forum section: electronics / testgear

author: K1JOS
author_rank: Regular Contributor
timestamp: January 18, 2014, 09:36:22 pm
content: I just got a used 33410A and so far it seems to work perfectly and in excellent shape. However, the fan appears much noisier than I expected sounding almost like the noise one hears from a drafty window on a windy day. More troubling than the noise is the varying pitch of the low-pitched whistling exhaust making me worried about a power supply stability problem. I have not disassembled it yet as I ahve a right to return it. The meter is spotless without dirt/dust apparent. Apart from opening it up and checking the fan voltage for stability , any other advice would be appreciated.Jerry

author: Noise Floor
author_rank: Regular Contributor
timestamp: January 18, 2014, 11:14:09 pm
content: What's the build date? You mention you have the right to return it, is it from a used/rental retailer? If so, see if you can listen to an identical model and see if it sounds the same.

author: K1JOS
author_rank: Regular Contributor
timestamp: January 18, 2014, 11:20:32 pm
content: It was a remote purchase - i live in the sticks :-)jerry
HP 163Xx pod connectors? - Page 1
Forum section: electronics / testgear

author: AndersG
author_rank: Contributor
timestamp: January 20, 2014, 01:54:30 pm
content: Just wondering. I have a HP 1631D where two pods lack the connector for the flying leads. The connector has a 3,96mm spacing, but I have been unable to find any off the shelf connectors that fit. Any suggestions?Have been toying with the idea of creating my own connector, using crimp terminals such as the TE 929939-6.
Fluke 12 Photo Needed - Page 1
Forum section: electronics / testgear

author: vsboost
author_rank: Contributor
timestamp: January 01, 2014, 09:06:36 am
content: Hi Guys,Was wondering if anybody could please take a nice close up shot of the contact pads on a Fluke 12 multimeter, this one was my dads and he gave it to me to play with years ago after he blew the tracks off it. I was thinking of making some sort of template and using some conductive paste/glue to re create the blown tracks (circled red).Cheers

author: retiredcaps
author_rank: Super Contributor
timestamp: January 01, 2014, 09:13:24 am
content: The 12 service manual has a schematic.http://www.techedu.com/pdf/Fluke/10_11_12_ServiceManual.pdfExcavatoree provided a picture of the Fluke 10 in this threadhttps://www.eevblog.com/forum/chat/fluke-25-my-first-digital-multimeter/msg36115/#msg36115

author: vsboost
author_rank: Contributor
timestamp: January 01, 2014, 09:22:56 pm
content: Thanks for looking that up for me but the photos don't show the solder pads unfortunately.Cheers

author: Sjokolade
author_rank: Regular Contributor
timestamp: January 01, 2014, 09:53:42 pm
content: I got a few pictures of the Fluke 10 - they might have similar pads.

author: vsboost
author_rank: Contributor
timestamp: January 02, 2014, 12:08:52 am
content: Thanks Sjokolade,Do you happen to have one front on?

author: Mike S
author_rank: Contributor
timestamp: January 02, 2014, 01:09:02 am
content: Fluke 12 Board

author: vsboost
author_rank: Contributor
timestamp: January 02, 2014, 01:49:29 am
content: Thanks Mike S,This is exactly what i needed, will report back once my conductive glue gets here.

author: Sjokolade
author_rank: Regular Contributor
timestamp: January 02, 2014, 11:36:37 am
content: I only have those two pictures.Mike S - what camera did you use for your pictures ?

author: Mike S
author_rank: Contributor
timestamp: January 02, 2014, 11:50:48 am
content: Quote from: vsboost on January 02, 2014, 01:49:29 amNo problem.Quote from: Sjokolade on January 02, 2014, 11:36:37 amAn old Canon Rebel XTi with the "kit" lens.

author: vsboost
author_rank: Contributor
timestamp: January 17, 2014, 08:01:34 am
content: Well the results are in.Pic one: I printed a picture of what Mike S sent me to scale approx 13.8mm wide and used the needle of the syringe to make the holes where the solder pads are (that took ages i made many holes like a tattoo gun then gently scraped the paper away)Pic two: After making the template and squeezing some solder paste/gluePic three: Cleaned up some of the mess, not the best lookingPic four: It works yay!! all buttons and modes function correctly

author: retiredcaps
author_rank: Super Contributor
timestamp: January 17, 2014, 08:11:25 am
content: Quote from: vsboost on January 17, 2014, 08:01:34 amGreat repair job.Thanks for sharing and reporting back.

author: Gromitt
author_rank: Regular Contributor
timestamp: January 18, 2014, 05:00:05 pm
content: Quote from: Mike S on January 02, 2014, 11:50:48 amThats a Canon EOS 400D for anyone outside of North America BTW, I have one to, old but OK./stefan
How Wonderful! Detailed Specifications! - Page 1
Forum section: electronics / testgear

author: Carrington
author_rank: Super Contributor
timestamp: January 17, 2014, 03:18:46 pm
content: Detailed Specifications! I love it!This is awesome:http://sine.ni.com/ds/app/doc/p/id/ds-247/lang/es#detailedspecs-sectionHave you seen something similar from another manufacturer?If so, please leave your comment.
Anyone have softcopy of Agilent 89600S VSA Service manual - Page 1
Forum section: electronics / testgear

author: han
author_rank: Frequent Contributor
timestamp: January 17, 2014, 06:21:34 am
content: Is Agilent 89600S VSA have a service manual, i search in internet without any result...so did the service manual even ever exist?note: Service manual is not User Manual...thanks