hybridfree/eevblog-posts huggingface dataset:
Pretty Good Surplus Score: EDC 501-J Programmable DC Voltage Standard - Page 1
Forum section: electronics / testgear

author: DarkStar
author_rank: Contributor
timestamp: May 04, 2014, 03:16:11 am
content: Well, I caught the local surplus electronics store slipping - saw aEDC 501-J Programmable DC Voltage Standardfor $25 USD on the shelf. I figured for the price, I might as well plug it in - though the label stated that it needed "tinkering" (their way of saying it was broken).Borrowed their Fluke multimeter and plugged the guy in and couldn't find any issues - counts seemed right on... Needless to say, I threw my $25 at them and got outta there!Installed options are B, C, D, AM-1 and IS-40.I never thought I would have a nice reference in the lab - fortunately myel-cheap-o multimeterseems to be just as accurate as I had hoped, though I told my wife there is a Fluke on my Christmas list!

author: Vgkid
author_rank: Super Contributor
timestamp: May 04, 2014, 03:38:28 am
content: Great score, and really neat unit. A BCD voltage reference.post up some pics.

author: DarkStar
author_rank: Contributor
timestamp: May 04, 2014, 03:58:33 am
content: Let's see how these attachments turn out...

author: staxquad
author_rank: Frequent Contributor
timestamp: May 04, 2014, 04:33:27 am
content: $25US???

author: DarkStar
author_rank: Contributor
timestamp: May 05, 2014, 03:30:52 pm
content: Haha! I love that!I dug the label that they put on it out of my recycling (attached) - when I asked them about this they told me that the negative output or LED worked and all the lights would come on with the switches not doing anything. I figured if nothing else I could probably get it working well enough, but looks like a case of RTFM - no negative output because that option module wasn't installed and all the lights were coming on since they had it in program mode instead of manual.I am looking for a complete service manual though for this, as the one Krohn-Hite has on their website has the best pages removed (theory of operation, calibration, schematic, etc). I found someone else that was told a new manual costs $100 - probably not a bad price given the value of the unit.

author: XOIIO
author_rank: Super Contributor
timestamp: May 05, 2014, 03:58:16 pm
content: Aw maaaaaan, this is why I hate Canada sometimes, you'd never see a store like this around here, especially in SaskatchewanNice find.

author: miguelvp
author_rank: Super Contributor
timestamp: May 06, 2014, 04:24:30 am
content: I found a cal pdf that shows the adjustment locations don't mind the name on the pdf they were calibrating a couple of devices:http://www.pearl-hifi.com/06_Lit_Archive/15_Mfrs_Publications/HP_Agilent/HP_3456A_Cal.pdfAnd they refer to the manual you linked, but that is missing a lot of pages as you mentioned.Edit: Not a lot of info and it's hard to read and only one page and some of the procedure, but better than nothing (although might be worse since it's illegible)
GPS-1072B Oscilloscope - Page 1
Forum section: electronics / testgear

author: sigma
author_rank: Newbie
timestamp: April 28, 2014, 12:47:36 pm
content: Hi All,I'd like to buy an oscilloscope .when i search for some brand and model.. i found a brand named 'GPS' (General Polytronic System).the website is :www.gpslimited.comthis company is in UK . now Is there anyone who has worked with this brand?i 'd like to buy gps-1072b model (bw 70MHz, realtime 1gs/s, equvalant 50gs/s, 2ch, 32 automatic measurement ,7" Display, ...)thanx 4 answer

author: electronics man
author_rank: Frequent Contributor
timestamp: April 28, 2014, 12:53:26 pm
content: It's probably a rebadged model from another manufacturer

author: Hydrawerk
author_rank: Super Contributor
timestamp: April 28, 2014, 01:42:39 pm
content: These GPS oscilloscopes are made by Siglent, China. They are not bad, but I am never gonna buy any. Do some search at this forum.http://www.gpslimited.com/products/1000c.htmlSiglent scopes are sold as LeCroy WaveAce, BK Precision and Atten.Please see this Siglent SDS 1000CFL Series.http://www.siglent.com/en/product/detail.aspx?id=100000003683915&nodecode=119008001

author: sigma
author_rank: Newbie
timestamp: April 28, 2014, 01:56:34 pm
content: thanksi want to know, is the gps comparable to gw-instek or regol ?

author: Hydrawerk
author_rank: Super Contributor
timestamp: April 28, 2014, 01:59:50 pm
content: Well, many GPS scopes have bloody short memory like 24kpoints or so. Rigol or GW Instek is better.
Advantest 6581 manuals - Page 1
Forum section: electronics / testgear

author: quarks
author_rank: Frequent Contributor
timestamp: April 28, 2014, 04:20:14 pm
content: Hello all,I am looking for (english) documentation for the above 8.5 Digit DMM.So far I only found japanese/korean/chinese versions.Google, Bing and other translators unfortunately did not really work.For example I triedhttp://www.adc-tech.co.jp/techinfo/product/catalog_ducument/list/c_6581.htmlhttp://www.adc-tech.co.jp/techinfo/product/catalog_ducument/pdf/catalog_6581.pdfhttp://www.adc-tech.co.jp/techinfo/product/catalog_ducument/pdf/Spec_6581.pdfhttp://www.adc-tech.co.jp/techinfo/product/catalog_ducument/pdf/CommandMatrix_6581_1.pdfandhttp://www.doc88.com/p-601276996043.htmlAny helpful hint is appreciated.Thanksquarks
Rigol Ultra-Sigma - USB or Ethernet initialization - Page 1
Forum section: electronics / testgear

author: ats3788
author_rank: Contributor
timestamp: April 21, 2014, 06:17:28 am
content: Hello Guys I'm new in this Forum I like Dave's Internet Performance, very much.I think he is doing a great funny JobOn this Link you can see the initialization routinehttp://www.rigol-uk.co.uk/kb_results.asp?ID=29#.U1Sy_-lZqUkI ask this because I would like to write a Delphi Program toread the Oszi Information more handy.I need the initialization sequence, to receive data from the Oszi.I could do this with wireshark, but maybe someone can help me out.Greetings from Frankfurt Germany

author: miguelvp
author_rank: Super Contributor
timestamp: April 21, 2014, 06:35:47 am
content: Welcome to the forum.You might be interested in this thread:https://www.eevblog.com/forum/projects/software-tips-and-tricks-for-rigol-ds200040006000-ultravision-dsos/Haven't tried myself yet, although I did finally download it.

author: Harvs
author_rank: Super Contributor
timestamp: April 21, 2014, 08:33:57 am
content: I know nothing about Delphi, however what you want to do is find a library that allows you to communicate with the scope using NI-VISA. A quick google search shows some promising app note from Agilent on the matter.If you can get to that point, then it's simply a matter of sending it text based SCPI commands which are all documented in the programming manual for whichever scope you've got.If you really want to communicate with the scope without the aid of NI-VISA libraries, then you can do it, it's just a hell of a lot harder. Here's a short investigation I did into it quite a while ago using Python implementing USB-TMC to control the DS2000 scope.https://www.eevblog.com/forum/projects/rpi-to-ds2000-control-commands/

author: ats3788
author_rank: Contributor
timestamp: April 22, 2014, 07:22:16 pm
content: Thx you GuysIt will take a while till I have read this

author: MatCat
author_rank: Frequent Contributor
timestamp: April 22, 2014, 07:33:33 pm
content: Downloading that is not going to help you much, it's closed source. What you really want ishttp://www.rigol.com/download/Oversea/DS/Programming_guide/DS1000Z_Programming%20Guide_EN.pdf

author: ats3788
author_rank: Contributor
timestamp: April 27, 2014, 08:50:50 am
content: MatCat that sounds really good THX
Vintage teardown- Weston 6000 - Page 1
Forum section: electronics / testgear

author: reagle
author_rank: Unknown
timestamp: February 17, 2014, 07:17:29 pm
content: More of a "first look and take pictures" rather than a full teardown and analysis, but it's pretty non-the-less:http://kuzyatech.com/vintage-multimeter-weston-6000If anybody has access to schematics, Weston-to-Normal parts mappings or the LCD glass- please let me know!

author: reagle
author_rank: Unknown
timestamp: April 26, 2014, 05:08:04 pm
content: Just updated with a scan of the user manual.

author: Vgkid
author_rank: Super Contributor
timestamp: April 26, 2014, 06:53:37 pm
content: Did you ever figure out what the Weston marked ic's were?

author: SeanB
author_rank: Super Contributor
timestamp: April 26, 2014, 07:11:28 pm
content: Easy enough to work out a rough mapping for the LCD by simply tracing the ITO traces on the top of the glass and tracing to the edge. It likely is a standard pinout, 28 pins says it likely is a standard 1888 display with a DP per segment and a single backplane. TRy looking online for 1888 LCD displays with a single side connection, it is likely to be a similar pinout as the ITO can not handle any other layout easily.

author: reagle
author_rank: Unknown
timestamp: April 26, 2014, 08:54:37 pm
content: Yep, working on that- it's a pretty standard pinoutQuote from: SeanB on April 26, 2014, 07:11:28 pm

author: reagle
author_rank: Unknown
timestamp: April 26, 2014, 08:56:21 pm
content: Not yet. They do site a patent describing how they do ADC conversions, so the chips could could potentially be custom. The display driver I initially though was the standard meter chip, but it's definitely not.Quote from: Vgkid on April 26, 2014, 06:53:37 pm
Another alternative to software EasyScope 3? - Page 1
Forum section: electronics / testgear

author: pub2000
author_rank: Newbie
timestamp: April 25, 2014, 04:21:37 pm
content: Hello everyone,This is my first post here and I have queries, to explain: I have a ATTEN1102CAL and use it with software EasyScope3.I want to measure the THD, as is done with other software as PicoScope6. I don't know if PicoScope6 recognize my oscilloscope? What do you think? And if the software does not do this, I which software to use? Some advice please?Regards,pub

author: pub2000
author_rank: Newbie
timestamp: April 26, 2014, 07:47:49 am
content: No one?I'll try today to see if it works PicoScope Oscilloscope Software with my ATTEN 1102 osciloscopes.Do your's know how calculating THD from FFT data ?
Newtronics 200MSP function generator - Page 1
Forum section: electronics / testgear

author: Hydrawerk
author_rank: Super Contributor
timestamp: April 26, 2014, 01:57:48 pm
content: At school we have these function generatorsNewtronics 200MSP.Does somebody know anything about them? Where were they made? How old are they? From late 1980s? Did that manufacturer produce anything else? Why is there almost no info on the internet?? Weren't they made in Korea for example? Yes, I asked the teacher and she did not know anything.

author: Hydrawerk
author_rank: Super Contributor
timestamp: April 26, 2014, 02:05:23 pm
content: I could only find this improved version of that function generator.http://goughlui.com/?p=3286!!Pictures were not taken by me!!

author: Hydrawerk
author_rank: Super Contributor
timestamp: April 26, 2014, 02:09:35 pm
content: Picture fromhttp://goughlui.com/?p=3286
Better user manuals - Page 1
Forum section: electronics / testgear

author: copper dog
author_rank: Newbie
timestamp: April 22, 2014, 02:31:10 pm
content: Everyone likes the value available in some Asian built electronic test equipment such as the Rigol line of oscilloscopes however everyone complains about the terrible instruction guides. Has anyone ever rewritten any of these guides to provide a more intelligible version? There a large number of very experienced engineers out there with a firm grasp of these devices who could supply excellent guides. They wouldn't even need to be extensive, just following the existing manual with slightly expanded descriptions of the various functions using proper grammar would be a great help. A bonus would be expanding slightly on some of the more obscure explanations found in a manual. I personally would help crowd fund something like that. If something like this has already been done I would appreciate a point in the right direction.Sent from my iPad using Tapatalk

author: aargee
author_rank: Frequent Contributor
timestamp: April 23, 2014, 11:43:49 am
content: It's been done with some gear, here's the manuals for a Baofeng UHF Amateur radiohttp://www.miklor.com/uv5r/UV5R-Manuals.htmlit really needs a keen personal/community interest.Having said that, it is a great idea.

author: Matchless
author_rank: Regular Contributor
timestamp: April 23, 2014, 04:01:40 pm
content: Have a look here (post 574) :https://www.eevblog.com/forum/testgear/hantek-6022be-20mhz-usb-dso/574/I have to agree with you, but most people never read the user manuals anyway!

author: FrankenPC
author_rank: Unknown
timestamp: April 23, 2014, 04:30:28 pm
content: This is how sad the state of affairs is with Chinese user manuals... I found an online copy of the Siglent SDS2000 series manual and was glossing through it and I was shocked to see that the text has been proofread. The manual is nothing exceptional. It's 10,000 miles away from an HP or Tektronix manual. But the grammar and spelling is not bad.That's right. I was impressed and amazed that they made an actual effort to proof their material. That is unbelievably sad.The manual:http://gigaplus.makeshop.jp/labros/pdf/SDS2000UserManual_V1.0.pdf

author: copper dog
author_rank: Newbie
timestamp: April 24, 2014, 08:55:34 pm
content: I'm sorely tempted to try re-writing the Owon Oscilloscope manual I have just to see what kind of reception it would get. (Yeah yeah I know its a crappy scope but it's one purchased often by hobbiests.) I wonder if there would be a way to crowd source something like this? A Wikipedia sort of thing where users supply the corrections to poorly written and obscure product manuals? A manual is posted and areas requiring better descriptions are highlighted for user input. The new procedures/descriptions are vetted and posted until a better one is submitted. I would suspect that, if it caught on, even the manufacturers would begin to use the 'corrected' versions of their own manuals hopefully making the site obsolete sometime in the future.Sent from my iPad using Tapatalk
Does Any one have experience with this psu - Page 1
Forum section: electronics / testgear

author: electronics man
author_rank: Frequent Contributor
timestamp: April 24, 2014, 05:22:23 pm
content: I am thinking of buying a new power supply, does any one have any experience with the tektronix pws2323 32v 3A power supply?http://uk.farnell.com/tektronix/pws2323/power-supply-1ch-32v-3a-adjustable/dp/1824784I have also found the Agilent u8000 series witch looks really good and is really cheep

author: mucek
author_rank: Contributor
timestamp: April 24, 2014, 06:24:40 pm
content: Take a look at TTi devices as well.http://www.tti-test.com/I have some and they are really great devices - and even UK based!Regards,Gregor

author: electronics man
author_rank: Frequent Contributor
timestamp: April 24, 2014, 07:17:25 pm
content: i have given tti the most consideration it just the form factor of there PSUs arnt that great for my bench i havnt got much space so i need to be able to stack equipment
HP 8752C A3 source parts identification help needed - Page 1
Forum section: electronics / testgear

author: WuLi
author_rank: Newbie
timestamp: April 24, 2014, 12:09:05 pm
content: Hi all,I'm in the proces of debugging the signal source of my vna and I need some help on identifying two zener diodes. The diodes have the following codes on them:1) 106 25K 5072) 685 35K 451I was able to retrieve the zener voltage of the first diode because there are more of them on the same board. It's a 22V zener. I'm unable to retrieve the value of the second one. There seems to be no logic in the coding. Can anybody help me out? I've attached a picture the two diodes are the ones with the black marker dots on them.

author: Thomas
author_rank: Regular Contributor
timestamp: April 24, 2014, 01:00:07 pm
content: They are not diodes, they are tantalum capacitors. The band is on the positive terminal.1) 106 = 10 with 6 zeros behind = 10 000 000 pF = 10uF, 25V. K is the tolerance.2) 685 = 68 with 5 zeros behind = 6 800 000 pF = 6.8uF, 35V.

author: Sailor
author_rank: Regular Contributor
timestamp: April 24, 2014, 01:01:58 pm
content: Are you sure they're diodes? They look like tantalum caps to me.

author: WuLi
author_rank: Newbie
timestamp: April 24, 2014, 01:20:40 pm
content: Wow guys, that was fast.. Thank you very much.
VISA/Benchvue/UltraScope mess - Page 1
Forum section: electronics / testgear

author: sportq
author_rank: Regular Contributor
timestamp: April 24, 2014, 09:42:24 am
content: A while back I installed Agilent Benchvue to control E3631A Power supplies via GPIB/HPIB, everything worked well. Then last week I bought a Rigol DS1074Z scope and attempted to use supplied UltraScope (US) software to remotely control and capture data from it as well.Agilents instrument explorer application could see the Rigol via the LXI LAN interface but it seemed like Rigol US would not use the Agilent drivers so I installed the National Instruments VISA driver on the CD supplied with the Rigol. All worked well.... for the Rigol however Benchvue has broken. It can no longer talk reliably to the E3631A, it disconnects every 2-3 seconds.I must admit, I'll completely confused by all the layers of software and drivers. Can NI VISA drivers coexist with the Agilent drivers and if not, how can I have multiple manufacturers control applications installed on the same PC?Is there a vendor neutral app that can do this? I know Matlab, NI LabView and other expensive options exist but is there anything low-cost or free?Pete

author: TiN
author_rank: Super Contributor
timestamp: April 24, 2014, 10:56:39 am
content: There is VISA conflict manager in Agilent IO connectivity suite , which is handy to allocate specific interfaces for specific VISA libraries.But yea, it can be a mess, specially with Tektronix VISA. I had to use separate computer with access with remote desktop to use TLA software, as it's VISA don't like anything else...

author: sportq
author_rank: Regular Contributor
timestamp: April 24, 2014, 12:54:18 pm
content: Jeez, so it's as bad as I thought. Thanks for the tip about the conflict manager though, I'll look into that.I forgot to mention that in Benchvue there is a drop down list in the bottom right of the window that lists both driver libraries, so it's a least aware of the NI drivers however selecting either one makes no difference, same disconnect problem after a couple of seconds.Pete
Modules Compatible with TLA704? - Page 1
Forum section: electronics / testgear

author: bench_knob
author_rank: Regular Contributor
timestamp: April 22, 2014, 07:18:58 am
content: Hi,Any one out there know whether or not TLA7Nx, TLA7Px or TLA7AAx modules are compatible with TLA704, running Win2k & TLA App 5.1?Thanks in advancebenc_knob

author: nctnico
author_rank: Super Contributor
timestamp: April 22, 2014, 10:07:38 am
content: These all work.

author: bench_knob
author_rank: Regular Contributor
timestamp: April 22, 2014, 08:15:29 pm
content: Thanks...
Hp 8563A SA - Page 1
Forum section: electronics / testgear

author: jlmoon
author_rank: Unknown
timestamp: April 22, 2014, 02:02:31 pm
content: Well spring has sprung and it is annual time to check those nvram / backup batteries.Does anyone know if a 8563A has a Dallas style or similar NVRAM or cal constant battery that should be changed. Figured while doing my spring cleaning and equipment evals I would get all the batteries up to date. Thank you in advance..JLM
Tektronix 11801/11802 information request - Page 1
Forum section: electronics / testgear

author: eurofox
author_rank: Unknown
timestamp: April 22, 2014, 09:31:06 am
content: Hi,Since I play for the moment with fast pulse generators I would like to measure them but my 1Ghz Agilent scope is limited to go into the picosecond range.I don't have any experience in sampling oscilloscope, just know that it is dedicated for repetitive signals.Sampling oscilloscope from Tektronix 11801/11802 with extra head are widely and quite cheap available on eBay.Are they using NVRAM's making them unusable in the future, I couldn't find any information in Tek service manual?Thanks in advance to share your experience.eurofox

author: nctnico
author_rank: Super Contributor
timestamp: April 22, 2014, 10:06:53 am
content: AFAIK the sampling heads are often broken. A majour nuisance is the EEPROM in the sampling head which may stop working. It can be fixed but I don't know the exact details.
Caps for HP 0370-1099 knob - Page 1
Forum section: electronics / testgear

author: Rory
author_rank: Frequent Contributor
timestamp: April 16, 2014, 03:42:01 am
content: Scored a decent eBay find of an HP 6236B power supply. Works great, cosmetically it's usable but had a few magic marker notes that I've been able to take care of.It needs a couple of the caps on the voltage set knobs. Can anybody tell me where to get two of them? Beige, about a half inch in diameter. The knob is HP P/N 0370-1099.(Fixed the model number, it was a typo...)

author: amc184
author_rank: Regular Contributor
timestamp: April 16, 2014, 05:27:20 am
content: That's not the right number, maybe you mean 6236B? I have one of them, and I think it's missing the same caps, but it never bothered me that much.I've had some luck withTucker Electronicsin the past, they stock a whole bunch of OEM HP parts.

author: Rory
author_rank: Frequent Contributor
timestamp: April 21, 2014, 12:34:23 am
content: I contacted Tucker, they had a junker 6236B with one complete knob. $25 plus shipping. Too much for one knob.I'm hoping someone on the board here has a junked out scope/gen/ps of this vintage that can part with a couple of the knobs.

author: uoficowboy
author_rank: Regular Contributor
timestamp: April 21, 2014, 06:42:38 am
content: Quote from: Rory on April 21, 2014, 12:34:23 amI wonder if they'd throw in extra parts from their junker for low cost... I'd love to get the power neon from a 6236B. That part appears to be made out of complete unobtanium. Not that I'm desperate - but if they'd do it for cheap we could potentially share the cost...One other thought for you - you could always try the HP/Agilent mailing list on Yahoo. You could probably find somebody there that'd sell you some for something more reasonable.

author: Rory
author_rank: Frequent Contributor
timestamp: April 22, 2014, 02:15:26 am
content: Tucker would be just as glad to sell that junker to you as they would to me. It only had one complete knob.
Agilent S/W bundle   - Page 1
Forum section: electronics / testgear

author: Shas-O
author_rank: Contributor
timestamp: April 22, 2014, 08:51:36 am
content: HiAny body see that agilent price drop on the S/W licenses for the 3000x scopes.Now that I've populated all mine the hard cash way they go and release them in a bundle for the price of one...*****trds.Shas-O

author: Bored@Work
author_rank: Super Contributor
timestamp: April 22, 2014, 10:28:26 am
content: Quote from: Shas-O on April 22, 2014, 08:51:36 amIf you just bought recently give them a call and ask them if they can give you a refund, a partial refund or some other compensation. Maybe they decline, but you won't know until you ask.

author: mwilson
author_rank: Contributor
timestamp: April 22, 2014, 03:05:25 pm
content: Quote from: Shas-O on April 22, 2014, 08:51:36 amYes, here's the forum thread discussing it:https://www.eevblog.com/forum/testgear/oscilloscope-feature-wars-agilent-options
What is this and what does it do? - Page 1
Forum section: electronics / testgear

author: Homer J Simpson
author_rank: Super Contributor
timestamp: April 22, 2014, 03:07:13 am
content: I have no clue on this.Comdyna Variable Diode Function Generatorhttp://www.ebay.com/itm/Comdyna-Variable-Diode-Function-Generator-Model-701-/231210733836?&_trksid=p2056016.m2518.l4276

author: miguelvp
author_rank: Super Contributor
timestamp: April 22, 2014, 03:25:45 am
content: No idea either but:http://www.analogmuseum.org/library/comdyna_functiongenerators.pdffrom:http://www.diale.org/dfg.htmlmanufacturer:http://www.comdyna.com/Some kind of analog module, so it means you need an analog computer of shorts. Edit: maybe not on that module.Some info about how they run: Edit nope this is for the analog computer.http://seit.unsw.adfa.edu.au/staff/sites/petersen/Teaching/Control_Theory_1/Lab2/lab2.pdfEdit: more info:http://www.analogmuseum.org/english/library.html

author: FrankenPC
author_rank: Unknown
timestamp: April 22, 2014, 04:11:39 am
content: Fascinating! I'm halfway considering buying it just to tear it apart.

author: Alexei.Polkhanov
author_rank: Frequent Contributor
timestamp: April 22, 2014, 05:21:29 am
content: Well simple search for "diode function generator" returns plenty of stuff to readDevice could have bunch of diodes connected in series with variable resistors in parallel making it possible to shape triangular wave or ramp on input to an arbitrary output waveform (within limits).This device may actually have series of "Ideal diodes" instead of real discrete diodes. Here is interesting link:http://schmitzbits.de/diode_tutorial/index.htmlI think I have read about the idea in "Art of electronics".Also isn't this how Electronic music was made in 60s and 70s?
Agilent 54622D and SPI/I2C decoding - Page 1
Forum section: electronics / testgear

author: EGDima
author_rank: Newbie
timestamp: April 19, 2014, 10:47:22 pm
content: Hello,I am struggling to find any information on this topic. Does Agilent 54622D support decoding serial buses and actually show data in hex or binary?Thanks!

author: 128er
author_rank: Regular Contributor
timestamp: April 20, 2014, 11:24:35 am
content: At the Agilent website they say "I²C, SPI, LIN, CAN and USB triggering". But nothing about decoding. So , it will not be ablehttp://www.home.agilent.com/en/pd-1000000811%3Aepsg%3Apro-pn-54622D/portable-mso

author: EGDima
author_rank: Newbie
timestamp: April 20, 2014, 07:43:47 pm
content: Interesting, thanks for the information. Does it mean that MSO/logic analyzer features of this unit are useless. Why would anyone use a logic analyzer without being able to see the data?

author: 128er
author_rank: Regular Contributor
timestamp: April 20, 2014, 08:04:27 pm
content: Here you can see an Agilent 54642D in action (from minute 6). The Agilent guy says something about decode and triggering.The agilent webpage about the 54642D also tells you nothing about decoding, only triggering. Maybe you have to look deeper in the manual.

author: EGDima
author_rank: Newbie
timestamp: April 21, 2014, 05:28:50 am
content: Thanks for the video link. It looks like it can actually decode data for triggering purposes but can't show the arbitrary data itself. Not sure how useful such triggering is though, sigh. But maybe I just don't know proper uses for this.

author: Mark_O
author_rank: Frequent Contributor
timestamp: April 21, 2014, 06:26:36 am
content: Quote from: 128er on April 20, 2014, 08:04:27 pmTriggering is one thing, which it does well. Decoding is something else entirely, where it interprets a bit-stream and displays bytes in various formats. It doesn't do that at all. Only newer devices can do that.QuoteThat's no accident. You can look infinitely deep, but find nothing, because there is nothing.

author: Mark_O
author_rank: Frequent Contributor
timestamp: April 21, 2014, 06:31:39 am
content: Quote from: EGDima on April 21, 2014, 05:28:50 amTriggering without decoding is useful for determining the presence, timing, and relative location of data within a bit-stream. You can see if it's structured properly, and if there are things like runt pulses, or spurious noise. You can't see the actual data values, without decoding them yourself (which I've done on occasion in the past, though it's a PITA). But sometimes you don't need that. If you do, these are not the tools you want to be using.

author: EGDima
author_rank: Newbie
timestamp: April 21, 2014, 10:22:35 pm
content: Thanks for all the answers. I think I will stick to 54622D + saleae combo. Using agilent trigger and decode by using saleae.
Tektronix 2445B 200MHz Problem - Page 1
Forum section: electronics / testgear

author: bolvan
author_rank: Newbie
timestamp: April 19, 2014, 02:44:25 pm
content: Hello, I have Tektronix 2445B with 200MHzProblem A5 PCBI have made new 10µF and 33µF capasitor.power suply the J119 with J251 A5 PCB1. -2,6V ________________14. 0V ___GND2. +4,46V ______________13 .0V3. -17,4V _______________12. +2,3V4. +1,7V ________________11. -1,4V5. -0,9V ________________10. 0V6. +2,6V________________ 9. +15,6V7. 0V ___________________8. +15,1VDS1225Y I have readWhether the data are good, I do not know .....Does anyone dump for 2445B 200MHz?

author: BravoV
author_rank: Super Contributor
timestamp: April 19, 2014, 03:06:35 pm
content: Assuming you've measured the voltages at J119 properly, looks like many of the voltages are wrong.These are the standard voltages that must be follow for your scope to work properly. Time for some serious work at the psu.

author: bolvan
author_rank: Newbie
timestamp: April 19, 2014, 03:10:17 pm
content: Thanks,power supply at the J119 with plug is removed J251 (A5 PCB)1. -15V ...........14. 0V ...GND2. +4,98V ........13. 0V3. -18,58V ........12. +4,96V4. +9,99V ........11. -8,04V5. -4,97V ------..10. 0V6. +14,96V ......9. +42,3V7. 0V .............8. +86,8VIs board A5 PCB defective?

author: casinada
author_rank: Frequent Contributor
timestamp: April 19, 2014, 04:03:15 pm
content: Look on the treads for Tektronix 2465-2467 Oscilloscopes in the forum and also at the Yahoo Tekscopes group. They are very much the same except the A1 board that is a little bit different. If you have a way to backup your DS1225Y you can download the one for a 2465B from thewww.KO4BB.comfile repository. The A5 might be bringing down the power supply or the power supply is not able to provide enough current. Have a visual inspection of the LV power supply, look for suspicious capacitors or resistors. Measure the ripple of the power supply voltages using another oscilloscope. Good luck.

author: guido
author_rank: Regular Contributor
timestamp: April 19, 2014, 04:51:04 pm
content: If it's anything like my 2465 than all supplies depend on the +10V reference voltage to be good. If that one is out, the others will also be. So check that first.In my case a 12V (iirc) zener diode on the output of the 10V reference voltage was broken, so the reference voltage was about 6V. It's just after the reference circuit on the supply pcb.

author: casinada
author_rank: Frequent Contributor
timestamp: April 19, 2014, 10:04:58 pm
content: His reference voltage is fine at 9.99V but it seems that the A5 board is bringing all the voltages down.

author: guido
author_rank: Regular Contributor
timestamp: April 19, 2014, 11:10:05 pm
content: Maybe then the a5 board brings down only the reference.

author: bolvan
author_rank: Newbie
timestamp: April 20, 2014, 09:11:38 am
content: Thanks:)J251 - Pin 15, Pin 19 and Pin 20 not busy?

author: bolvan
author_rank: Newbie
timestamp: April 21, 2014, 03:01:46 pm
content: A6 Front Panel S3004, S3013 and S3019 break down?Tektronix 260-2283-00 Voltage per Division Switch
tiq probe - bridging the gap between DMMS and 'scopes - Page 1
Forum section: electronics / testgear

author: markhen
author_rank: Regular Contributor
timestamp: April 20, 2014, 12:30:53 am
content: Hi - I'm going to launch a Kickstarter campaign shortly for piece of test equipment - it's a much-updated take on logic probes, with a high-performance pulse analyzer and a pulse generator built into a low cost handheld probe.This video shows off most of it's functionality in just over one minute:http://youtu.be/aNhjCvGdqkAIt's being discussed over in the Crowd Sourced part of EEVblog forum now:https://www.eevblog.com/forum/crowd-funded-projects/upcoming-kickstarter-tiq-probe-bridging-the-gap-between-dmms-and-'scopes/Your inputs and thoughts welcomed!Best regards -Mark

author: markhen
author_rank: Regular Contributor
timestamp: April 20, 2014, 12:45:44 am
content: QuoteI know not everybody is interested in Crowd Sourced topics so may not visit that forum. Just wanted folks interested in test equipment to know this is coming up.If this is not allowed I fully understand (are you a moderator?). And then I expect this thread to be taken down, no issues.If it's not actually breaking rules,I'd ask everyone tonot reply into this thread, but rather head on over to the Crowd Sourced forum.Apologies if I made a noob error.Mark
Hioki 3531 calibration and the Hioki policy - Page 1
Forum section: electronics / testgear

author: pico61
author_rank: Contributor
timestamp: April 19, 2014, 08:28:21 pm
content: Recently I have bought on Ebay an LCZ meter Hioki 3531 hi z meter. As often happens with the instruments bought on Ebay, it did not works well! The defect was fixed quickly: someone had removed all interior screens and the measures were unstable. I remaking all screens and now the instrument works very well. I would like to calibrate the instrument and I searched on Internet for the service manual but I haven't found anything (even the user manual). I've contacted Hioki asking for the service manual or, at least, the calibration procedure but they turned the request to local service company. I can calibrate the instrument only through them. Unfortunately I have found that aren't available service manuals for the Hioki instruments. Even for items not more supported.I think that their instruments are built well but are too expensive. If in addition of this, there is the cost of calibration, where is the convenience of buying Hioki? What do you think?
Best practice to prolong DSO life - Page 1
Forum section: electronics / testgear

author: jamesglanville
author_rank: Contributor
timestamp: April 15, 2014, 08:35:11 am
content: Hi, apologies if this has been answered somewhere already, I haven't been able to find an answer.I have a modded DS1052E that I want to last as long as possible. Does it make any difference leaving it on for hours vs frequently turning it on and off? Or is this not important and I'll want a better 'scope before it dies of old age?

author: Kappes Buur
author_rank: Regular Contributor
timestamp: April 18, 2014, 11:33:10 pm
content: I guess it's the same idea as leaving a computer on all the time versus powering it up only when needed.I think that the camp is split 50/50 on this.Personally, I keep everything off when I don't use it.

author: rexxar
author_rank: Frequent Contributor
timestamp: April 18, 2014, 11:45:35 pm
content: Quote from: jamesglanville on April 15, 2014, 08:35:11 amYou will definitely want a new scope long before this one dies.Hell, Dave gave his 1052E to Sagan, and it's still kicking. I don't think power cycling can do a whole lot more damage than a toddler can.

author: VK5RC
author_rank: Unknown
timestamp: April 19, 2014, 12:49:35 am
content: I would tend to support the on/off, depending on how much you are going to use it during the day, the other thing I do is pull the plug out as I leave for the day, some units never really switch off. I am a bit uneasy re smps being on 24x7, old paranoia!
Rohde & Schwarz FSIQ 7 Signal Analyser, screen not working. - Page 1
Forum section: electronics / testgear

author: Palmsquirrell
author_rank: Contributor
timestamp: April 18, 2014, 11:33:09 am
content: Rohde & Schwarz FSIQ 7 Signal Analyser.Unit powers up but screen does not turn on/display anything.Is there a way to hook up an external LCD to check if the problem is with the screen?Also does anyone know the Part# for the screen?Thanks

author: tautech
author_rank: Super Contributor
timestamp: April 18, 2014, 11:54:32 am
content: Usually there is an inverter for the CCFL backlight PS. If it is not working there will be no visible display.Quick check for backlight problems is to shine a bright torch at the screen and look for an image "front lit". If a "front lit" image is present then fault find the inverter circuit.They can be a quite simple free running RC push-pull primary or a more complex IC controlled type.Another check is to hold a scope probe near the transformer and look for ~20 KHz oscillation.

author: KJDS
author_rank: Super Contributor
timestamp: April 18, 2014, 12:00:19 pm
content: It could be the backlight or if it is the display then these are usually a generic type. A quick search of the net should find a replacement but you'll need to take the instrument apart to find the generic part number.
BK multimeter ohms measurement polarity - Page 1
Forum section: electronics / testgear

author: MLXXXp
author_rank: Frequent Contributor
timestamp: March 19, 2014, 06:33:13 pm
content: I recently bought a BK Precision 2709B multimeter. I was surprised to find that the voltage output polarity, for the ohms and continuity functions, is reversed. The black common connector is positive with respect to the red connector.However, the polarity is "correct" for the diode and capacitor test functions. Red is positive and black is negative.Every other multimeter that I've owned or used has been red positive and black negative for all ohms, diode and continuity tests.Are reversed polarity outputs fairly common or rare for multimeters?

author: Excavatoree
author_rank: Frequent Contributor
timestamp: March 19, 2014, 06:52:16 pm
content: It's not common, but there are a few that are like that. (reversed polarity in resistance measuring mode)

author: tom66
author_rank: Super Contributor
timestamp: March 19, 2014, 07:52:05 pm
content: The idea with this is that if you check a resistor in parallel with a diode, the diode won't be biased into significant conduction, changing the reading.

author: MLXXXp
author_rank: Frequent Contributor
timestamp: March 20, 2014, 02:29:40 pm
content: Quote from: tom66 on March 19, 2014, 07:52:05 pmOn the ohms ranges, a good multimeter will have an open circuit output voltage low enough that it won't turn on a semiconductor junction. It won't matter which way the leads are to measure a resistor in parallel with a diode. This is true with the BK 2709B, except on the 0-660 ohms range, where the open circuit voltage is about 1.2V. For in circuit measurement, I always check both ways anyway, just in case, and don't always assume that there isn't something else in parallel that's messing up the reading.I just looked at the manual for the BK 2709B again and it actually does specify negative voltages for the ohms ranges. I hadn't noticed the minus sign when I initially read the manual.

author: Bored@Work
author_rank: Super Contributor
timestamp: March 20, 2014, 05:34:23 pm
content: Negative polarity in the ohms range was typical for old analog multimeters. It was just easier doing the range switching. The meter designers didn't have to switch the COM terminal around, but could have it permanently wired to the movement.

author: MLXXXp
author_rank: Frequent Contributor
timestamp: April 18, 2014, 11:28:11 am
content: I've realised that this reverse polarity ohms thing has an advantage:When testing diodes, you can check the voltage drop using the diode test range and then just switch the meter to the ohms range to check for high impedance in the reverse direction, without having to reverse the leads.
Retro HP Electro-porn - Page 1
Forum section: electronics / testgear

author: VK5RC
author_rank: Unknown
timestamp: April 17, 2014, 12:37:17 pm
content: An old but fully working HP 5371A (Freq & Time Interval Analyser) needed its back up battery (on board A7) replaced, apart from me nearly having a hernia lifting it off the shelf I thought I would take some photos along the way.The touch I like was the screws holding the RF shielding in place not only have a knurled head (so you don't have to use a screwdriver) but also the nuts into which they screw are fully retained, I love the labelling on the covers as well.Check out the RF finger stock, in between the two RF covers.The back up battery does suck quite a bit of juice nearly 1/2 mA, I think I will be back in there pretty soon.
RIGOL DS2000A Series - How to Change the ScreenSaver to a Custom Screensaver - Page 1
Forum section: electronics / testgear

author: BTO
author_rank: Frequent Contributor
timestamp: April 17, 2014, 08:33:37 am
content: Hi GuysStraight to the Point...I Own a Rigol 2072A Scope, 70MHz (Upgraded to 300MHz + All Trial Options Converted to Licensed Options)[Note: if anyone is reading the above statement and STILL wants to know how to Upgrade their scope..... Yes, Feel Free to PM me and i will help you.. it does work]But, Let's try to keep this Thread Seperate from the Upgrade Thread (God knows it's big enough and confusing enough),and Let's (For the Most part) Stay on this topic.Now.. Considering the Scope was able to be reverse engineered to achieve such a cool upgrade[THANKS TO THE EFFORTS OF CYBERNET / MADCROW / ZOMBIE28 / KAPPES BUUR / HOOVERPHONIQE / ANDYTURK] and all the restI THINK I HAVE A SIMPLER REQUEST THAT THESE GUYS CAN PROBABLY FIGURE OUTOr.. Anyone else for that matterMY QUESTION IS THIS.....HOW DO I CHANGE THE DEFAULT RIGOL SCREENSAVER TO A PICTURE OF MY CHOICEi thought it would be cool if we could do thatThus far i know that i can go intoUTILITY / SYSTEM / SCREEN / SCREENSAVER (vALUE = Default)i'm guessing that just like any device, their would be a rigol.png or rigol.jpg in there somewhereand the fundamental basics of this is...if we substitute our own photo (to.. of course comply with the required paramaters of the scope)we would effetively be able to inject a custom screensaverPicture it.. a Scope with a Cool Highlight Green Matrix Screensaver.......... sWEET.so.. Anyone , got any ideas on how to accomplish thisI Doubt this is even close to being considered Illegal or a Hack by Rigol's Standards.adding a screensaver is hardly a hack.Now, I've tried loading a random Picture (About 1MB) Format = .jpgmy idea was that if i go to ..UTILITY / SYSTEM / SCREEN / SCREENSAVER (vALUE = Default)And where the DEFAULT Value is Greyed outit may become available if it detects a Picture File on a USB sticktherefore an Import Option may present itselfHowever, I can't seem to Change the Default Value Under "Screensaver"I"m going to go back and have a look at the upgrade .GEL file that was used in the Upgrade to 300MHzand see if that reveals anythingin the meantime, guys...Feel Free to shout out ideas to help me out on this.Thanks ahead of time, and BE COOLi thought it might be cool to put a matrix screensaver or a BSOD screensaver on the scope LOL
AIM I-Probe 520 DC offset failed - Page 1
Forum section: electronics / testgear

author: icefire
author_rank: Newbie
timestamp: April 16, 2014, 06:02:20 am
content: I have a problem with my iProbe 520.The DC offset suddenly become zero when i was measuring DC current!The device now always run on AC mode even when the AC/DC switch is switched to DC.The calibrator works in AC mode, i can measure the calibrator square waveform.If i rotate the Trace Position knob, the DC offset move a little bit. But shortly afterward, it return to zero, just like it is running in AC mode.Anyone have the same issue happened?I just bought the device on Oct, 2012, just one and a half year. And i pretty sure i have turned on the probe less than 100 hours. Didn't expect the probe is so fragile for a made in England product.
Philips PM3233 - Page 1
Forum section: electronics / testgear

author: homerwsmith
author_rank: Newbie
timestamp: April 14, 2014, 03:42:20 am
content: Dear Gentle Folk,Using an older Philips transistor scope, dual beam 10 Mhz, works well for its age.I have the manuals.Recently while tuning a Teac XL-2000R, the straight line traces with no signal while normally centered suddenly droppedto near the bottom of the screen and started to display a 120Hz soft rounded triangle wave. Straight sides, rounded top.It appears on both YA and YB channels.The amplifier knob does NOT affect it.The time base knob, DOES affect it like a normal signal.The X and Y Position knobs DO affect it, and I can bring it back up to center screen,but when the scope goes back to behaving again, the straight traces are too high.The AC - 0 - DC switches on either YA or YB do NOT affect it, its always there.The X Via YA, shows a 45 degree line as if the signal was really there.If I add an input signal of any kind, it adds into the existing aberrant signal as expected, beating and all.The amplifier knob affects the input signal, but not the aberrant traces which are about 2 cm highregardless of amplifier setting.I have the scope manual, I know some electronics, but before I go in and blow myself up at 8.5KV can someone give me a clue where I am looking?1.) Its probably not in the input streams of YA or YB because both are bad at the sametime and they are quite independent.2.) I can't see how a vertical signal could get into the X time base circuity.3.) It could be a power supply issue, with perhaps a bad capacitor putting unfilteredpower into both the YA/YB circuits but the amplifier knob only affects input signals, and not thisaberrant one. With the amp up high, the input signals are huge but still add in with the smaller aberrant ones as expected.The scope usually comes up working fine, then after about 5 minutes startsthis odd behavior.Thanks in advance,Homer W. SmithLightlink Internet, CEO

author: oldway
author_rank: Super Contributor
timestamp: April 14, 2014, 04:33:51 am
content: Use an external DC 24V 2A supply instead of mains to feed the scope and see what happen.

author: homerwsmith
author_rank: Newbie
timestamp: April 16, 2014, 12:43:44 am
content: OK, thanks for that. Didn't get to the 24 Volt power supply, but noticed knob on theback offering different volages, 220 240 110 and 120. It was set to 120, probably by methe last time I played with it. I set it to 110 and the scope works fine, brighter too. Our voltageis about 116.Shall consider this closed for the time being.Homer Smith
Lower continuity beeper volume on fluke 87-V? - Page 1
Forum section: electronics / testgear

author: Pasky
author_rank: Regular Contributor
timestamp: February 06, 2014, 05:19:33 am
content: Anyone know if I could do this via settings, or perhaps there is a simple potentiometer I can adjust?

author: Everett_Tom
author_rank: Contributor
timestamp: February 06, 2014, 06:37:43 am
content: You can turn the beeper off using the "Power-On Options".When the meter is off, press and hold the Continuity button, turn the meter on and wait about 2 second. The beeper will stay off until you turn the meter off, and then back on again.See the User manual for more info, under the section on "Power-on"http://media.fluke.com/documents/87______umeng0800.pdf

author: rodcastler
author_rank: Regular Contributor
timestamp: April 14, 2014, 12:56:38 am
content: Or you can hack it (reversible) in 120 seconds. Instructions here:http://rodelectronics.blogspot.com/2014/04/lower-volume-on-your-fluke-in-two.html

author: retiredcaps
author_rank: Super Contributor
timestamp: April 14, 2014, 05:31:38 am
content: Quote from: rodcastler on April 14, 2014, 12:56:38 amJust remember to remove the hack if sending it back to Fluke for warranty repair.

author: rodcastler
author_rank: Regular Contributor
timestamp: April 14, 2014, 02:23:23 pm
content: Quote from: retiredcaps on April 14, 2014, 05:31:38 amOr just leave it there until they realize it would be good to add the software setting.

author: GiskardReventlov
author_rank: Frequent Contributor
timestamp: April 14, 2014, 11:59:24 pm
content: I like the idea of quieting the beeper down but I wanted mine to be silent.I'm adding a switch to disable the beeper sound, instead of a sound an led will flash.https://www.eevblog.com/forum/projects/bk-precision-2709b-beeper-modification-onoff-switch-with-led-indicator/I'm looking for the right switch still.

author: pickle9000
author_rank: Super Contributor
timestamp: April 15, 2014, 12:47:06 am
content: Quote from: GiskardReventlov on April 14, 2014, 11:59:24 pmIt would be nice to have a 2 part switch. A reed for inside and a magnet on a slider (sticky back) for the outside. No holes or destruction.

author: GiskardReventlov
author_rank: Frequent Contributor
timestamp: April 15, 2014, 04:04:11 pm
content: Quote from: pickle9000 on April 15, 2014, 12:47:06 amI will reply over in the other thread, I like this idea.