hybridfree/eevblog-posts huggingface dataset:
Can Rigol DP832 do ATX? - Page 1
Forum section: electronics / testgear

author: williakz
author_rank: Newbie
timestamp: August 05, 2015, 11:01:24 pm
content: So I'm working on some Meridian audio equipment (highly glorified PC architecture) with a bad power supply. I need simultaneous +/-12VDC, 5VDC, and Common. Staring at my DP832, I dimly remembered something untoward about sense/power lines tied to ground so I got skittish about tying reds to blacks to greens. Instead, I went into the parts bin and pulled out an old Dell ATX supply from a long-gone PC. There was my +/-12, 5, common easy-peasy (yellow,blue,red,black). Voila!So did I dodge a bullet with the DP832, miss a section in a manual somewhere, or need to do Electronics 101 all over again at the local CC? Thanks for any and all responses.

author: codeboy2k
author_rank: Super Contributor
timestamp: August 06, 2015, 12:06:46 am
content: This is the relevant post.https://www.eevblog.com/forum/testgear/how-to-get-10v-from-dual-power-supply/msg713896/#msg713896From that post :Quote

author: hobbified
author_rank: Newbie
timestamp: August 07, 2015, 07:54:55 am
content: Yes, you can do it. Expanding on what codeboy2k said, if you want +12/-12/+5 you should set CH1=12V, CH2=12V, CH3=5V, and common together CH1+, CH2-, and CH3-. Then you will have -12 at CH1-, +12 at CH2+, and +5 at CH3+. You can also tie your common ground to the case ground (green), which I think a real ATX supply would.The DP832 is pretty "small" for an ATX PSU (I'd call it effectively a 55 - 60 watter given that no one ever draws much from -12V; maybe even lower if the 5V is the limiting factor) so I hope your gear doesn't draw that much
Not necessary repair of Keithley 2000 - Page 1
Forum section: electronics / testgear

author: BFX
author_rank: Frequent Contributor
timestamp: August 06, 2015, 08:09:50 pm
content: I got this very good unit on de ebay. (it's specific for german seller that they able to send only to german)It's good for me since I work in Deutschland.AnyhowI know that this unit have something behind and capacitors are not bestAnd I replaced all capacitors in power lines.I hope that this unit will work next 10 years:)

author: BFX
author_rank: Frequent Contributor
timestamp: August 06, 2015, 08:17:06 pm
content: New capacitors are Rubicon and Panasonic life in between 3000- 10000 hours
Multimeters with "event" (threshold) logging? - Page 1
Forum section: electronics / testgear

author: Timur Born
author_rank: Regular Contributor
timestamp: August 04, 2015, 09:56:15 pm
content: Ahoi!Fluke 180/280 meters offers a data logging function that allows to specify event thresholds. As far as I understood, this means that the meter only logs events that pass that threshold while keeping all the other measurements out of the log.I would like to log possible drops and spikes of 220V mains over the course of days. If drops or spikes occur I'd like to know their duration and amplitude. But obviously I am not so much interested in recording hours and days of stable measurements, just to find single short anomalies. On top of that the lower time-resolution of regular logging mode smight be problematic (i.e. only 1 sample per second on the Flukes).Do other data logging meters offer anything similar to those Flukes?

author: Timur Born
author_rank: Regular Contributor
timestamp: August 05, 2015, 08:42:17 pm
content: Or to ask the other way around: How do you folks measure intermittent drops and spikes in mains?I am thinking of stuff that could make a PC run unstable (up to hanging), because the PC's PSU cannot deal with it. Like too long a dropout, too high a spike.

author: Wytnucls
author_rank: Super Contributor
timestamp: August 05, 2015, 09:58:55 pm
content: The Gossen MetraHit 26M (50,000 data points) has something similar. Read the user manual for more details. One sold recently for about 150$. PC interface and logging software are needed to analyze the data afterwards.In fact, it sold for a bargain: 121 euroshttp://www.ebay.de/itm/Digital-MultimeterMETRAHIT-26M-/121668758132?pt=LH_DefaultDomain_77&hash=item1c5405ea74&nma=true&si=awPLB55UIfSiodh235UhfRtJ5f4%253D&orig_cvip=true&rt=nc&_trksid=p2047675.l2557

author: Timur Born
author_rank: Regular Contributor
timestamp: August 06, 2015, 06:28:52 am
content: Thanks! I will have a look at it.
Behavior of oscilliscope software bandwidth limiters - Page 1
Forum section: electronics / testgear

author: GlowingGhoul
author_rank: Regular Contributor
timestamp: August 05, 2015, 05:45:32 pm
content: Do scopes that have software upgradeable bandwidth exhibit the typical 3db dropoff at the artificial maximum bandwidth? It would seem like the designers would have to out of their way to make that happen when the actual front end has a bandwidth significantly higher than the software limited bandwidth, but maybe they do?

author: Fungus
author_rank: Super Contributor
timestamp: August 05, 2015, 06:02:02 pm
content: The DS1054Z has a switchable capacitor on the front end to reduce the bandwidth, it's not software on that particular scope.So yes, it will have a fairly standard rolloff.

author: GlowingGhoul
author_rank: Regular Contributor
timestamp: August 05, 2015, 06:06:52 pm
content: Quote from: Fungus on August 05, 2015, 06:02:02 pmDo Tek and Keysight use a similar technique for bandwidth limiters? Seems like something that wouldn't require hardware to accomplish really...

author: Fungus
author_rank: Super Contributor
timestamp: August 05, 2015, 06:25:04 pm
content: Quote from: GlowingGhoul on August 05, 2015, 06:06:52 pmI'm sure people will let us know :-)It's really cheap to do in hardware (one capacitor+one transistor). Doing it in analog hardware probably gives a nicer result, too.So ... even though it's notnecessary, I'd be willing to bet they do it in hardware.

author: Wuerstchenhund
author_rank: Super Contributor
timestamp: August 05, 2015, 06:32:09 pm
content: Quote from: GlowingGhoul on August 05, 2015, 06:06:52 pmYes, the big brands (Keysight, LeCroy, Tek, R&S) use a similar approach (hardware filters).It's also simpler to do in hardware than in software, because you can't just tell the scope "ignore any signal about XXX MHz". You would have to filter out signal components over the desired cutoff frequency, which usually means you have to employ FFT which is pretty compute-intensive and would slow down your scope a lot.

author: Howardlong
author_rank: Super Contributor
timestamp: August 05, 2015, 06:39:58 pm
content: This might be worth a readhttp://literature.cdn.keysight.com/litweb/pdf/5989-5733EN.pdf?cmpid=zzfindevaluatingbandwidth

author: Fungus
author_rank: Super Contributor
timestamp: August 05, 2015, 06:47:40 pm
content: Quote from: Wuerstchenhund on August 05, 2015, 06:32:09 pmIt would also distort the signal slightly - not good in a device like an oscilloscope.

author: tautech
author_rank: Super Contributor
timestamp: August 06, 2015, 02:48:45 am
content: Quote from: GlowingGhoul on August 05, 2015, 05:45:32 pmNo, not AFAIK.
Metrix 2 channel differential probe unit. - Page 1
Forum section: electronics / testgear

author: JSE009
author_rank: Contributor
timestamp: August 05, 2015, 08:29:51 pm
content: Browsing the net I came around an announcement of Metrix of new 2 channel differential probe unitsMTX 1032-BandMTX 1032-Chttp://www.chauvin-arnoux.com/en/produit/mtx-1032.htmlMTX 1032-C• Bandwidth: 50 MHz• Compliance up to 600 V/Cat. II• Used with coaxial/banana cables and oscilloscope probesMTX 1032-B• Bandwidth: 30 MHz• Compliance up to 600 V/Cat. III• Used with sets of banana leadsThese units can be coupled directly to the scopes of Metrix but also be used as standalone.This could be very interested for using in a fixed setup on the test bench.I only wondering about the pro’s and con’s of using such fixed unit or using a separate 1 channel differential (cable) probes?Any comment or suggestions?

author: pascal_sweden
author_rank: Super Contributor
timestamp: August 05, 2015, 08:52:40 pm
content: Looks a nice concept to have it in a desktop caseBut do you have to connect the inputs from the scope on the front as well?Would have been nicer if they had the inputs from the scope on the back, and just the new isolated inputs on the front! This way you just hook up your scope once on the back, and can't miss with the leads on the front! The front acts as your new isolated scope front-end input.Do you know a distributor for this product in Benelux or Scandinavia? What is the recommended sales price?Conrad sells them in their webshop, but usually the sales prices from Conrad are on the high side:http://www.conrad.com/ce/en/product/123248/Chauvin-Arnoux-MTX-1032-B-DIFPROBE-MTX-1032-B-30MHz-Compatible-with-Scope-Meter-MTX-1052Note that I have 2 DP-30HS high-sensitivity differential probes from a company called Pintek.Excellent build quality! Most bang for buck differential probes that I know about!http://www.pintek.com.tw/product_detail/landersound/index.php?Product_SN=97781&Company_SN=6002&Product_Site_Classify_SN=17072I bought them from Pintek directly! They come in a nice case! Paid about 300 EUR for two.

author: nctnico
author_rank: Super Contributor
timestamp: August 05, 2015, 10:24:19 pm
content: I have seen similar boxes like the Metrix ones before. Basically a differential probe with BNC inputs instead of banana leads.
Does 85-90F temp in my lab is bad for my test equipment ? - Page 1
Forum section: electronics / testgear

author: danny_isr
author_rank: Regular Contributor
timestamp: August 05, 2015, 04:17:46 pm
content: So I measured the temperature during the hot summer days in my lab/office. It can get even to 92F.When I work there, I have the central A/C on and a fan (drops to around 82F). But when I'm at work I don't leave those on.I just wonder as calibration goes, can those temperature make my calibration drift ?I have thereRigol DLP 832Rigol 1054zTek 2225HP 34401aSiglent 1025

author: dom0
author_rank: Super Contributor
timestamp: August 05, 2015, 05:51:25 pm
content: The only precision instrument in your lab is the 34401a, and I wouldn't worry about it at 35 °C ambient temperature. I didn't look it up, but it's probably specified for the usual 0 ... 55 °C ambient range.

author: Kleinstein
author_rank: Super Contributor
timestamp: August 05, 2015, 07:04:14 pm
content: Drift and aging is expected to be slightly faster at high temperature. So at about 10 K above normal room temperatures one should expect about a 2 fold speedup. Since the high temperature are usually not year round, but only a few weeks, this is usually not a problem. A normal summer should be included in calibration intervals.The other thing is possible over-temperature in instruments with to low margin of safty. This might be a problem if you are at high altetude, which also hinders cooling. Critical parts are something like low cost linear power supplies and older high frequency parts that run rather hot even under normal operation.Having 85 F is not good for precision measurements - 30°C is better, because it works better with SI.

author: danny_isr
author_rank: Regular Contributor
timestamp: August 05, 2015, 08:25:47 pm
content: Quote from: Kleinstein on August 05, 2015, 07:04:14 pmWell I do live in Colorado, but I don't run anything in those high temp. It's was a question more of "storage temp". Because it does gets hot there during the day when i'm at work.I am just wondering if I should get maybe a window A/C for that room, and leave it running at 80F or so ?

author: Vgkid
author_rank: Super Contributor
timestamp: August 05, 2015, 09:03:09 pm
content: For storage that should be fine. the 34401A is -40-70C(-40to158F), with an op temp from 0>55C(32-131F) so as long as you keep it between thoe parameters it should be good.
4 Quadrant 3/1 Phase AC+DC Power Supply Recommendations - Page 1
Forum section: electronics / testgear

author: magicsmoke
author_rank: Regular Contributor
timestamp: August 05, 2015, 03:00:53 am
content: Does anyone have any recommendations for manufacturers or models of 4 quadrant 3/1 phase AC+DC power supplies? I am interested primarily in models of 10 kVA and below (probably 5 kVA or lower) with +/-300V or higher output voltage. This will primarily be used for testing power electronics, both DC/DC converter and inverters/active rectifiers.What I have run across so far are Kepco (linear and switch mode) and Chroma Regenerative Grid Simulator Model 61800 (The smallest is 30 kVA so larger than I need).

author: Stray Electron
author_rank: Super Contributor
timestamp: August 05, 2015, 07:16:04 pm
content: I'm not sure what you mean by "4 quadrant 3/1 phase AC+DC" but I've used both CI and Elgar brands of variable voltage/variable frequency AC power supplies and they both work fine. Elgar is by far the one that I most commonly see.http://www.programmablepower.com/brands/elgar.htmWhere are you located? I just picked up a three phase Elgar that I'm going to get rid of as soon as I do a couple of tests with it. I don't recall the ratings on it but it weights about 135 pounds! Oh here it is: Model 503A; output is 0 to 130 VAC and 45 to 5k Hz. Output power per phase 167 (probably VA).
Philips PM 2422 A & RFT G-1001.500: Service Manuals? - Page 1
Forum section: electronics / testgear

author: schwarz-brot
author_rank: Regular Contributor
timestamp: December 05, 2013, 12:55:01 pm
content: Hi there,got the two vintage meters in the Headline. Now I hope to find someone who has some Service-.pdfs for me. Else it will become quite interesting for me service these beauties.Thank you,Jan

author: rsjsouza
author_rank: Super Contributor
timestamp: December 05, 2013, 06:22:21 pm
content: I don't think there would be a problem for you to readthis PM2422 manual.

author: schwarz-brot
author_rank: Regular Contributor
timestamp: December 06, 2013, 11:37:19 am
content: Thank you, rsjsouza.Indeed it is no problem to read this. I found this one, too. I am not sure how much the standard 2422 differs from my 2422 A since I did not open it up yet. It seems to be older and has some features or solutions that do not exist anymore on my model. Since I found some costy sources for the A-models manual I know there has to be one around. But of course I am not willing to pay more for an copied manual than for the original device

author: PA0PBZ
author_rank: Super Contributor
timestamp: December 06, 2013, 11:50:58 am
content: http://www.oudio.nl/service/PM2422A%20Service%20Manual.pdf

author: schwarz-brot
author_rank: Regular Contributor
timestamp: December 06, 2013, 03:26:37 pm
content: Perfect! Thank you a lot!I Also got a complete documentation for the RFT on another forum. If anyone needs it feel free to contact me.See you!Jan

author: reinhardz
author_rank: Contributor
timestamp: August 04, 2015, 10:05:20 pm
content: Quote from: PA0PBZ on December 06, 2013, 11:50:58 amHello,I'm searching for PM2422A service manual, too. Unfortunately, the link doesn't work any more. Would you (or another helpful soul) provide a working link? Thank you very much in advance!Best regardsreinhardz

author: Guni
author_rank: Regular Contributor
timestamp: August 04, 2015, 11:48:11 pm
content: https://www.eevblog.com/forum/testgear/vintage-teardown-and-hopefully-repair-rft-g-1001-500-benchmultimeter/http://elektrotanya.com/rft_g-1001.500.pdf/download.html

author: reinhardz
author_rank: Contributor
timestamp: August 05, 2015, 12:05:29 pm
content: Quote from: Guni on August 04, 2015, 11:48:11 pmHi Guni,thank you very much, though I'm actually searching for the service manual for Philips PM 2422A. Unfortunately, the link provided by PA0PBZ doesn't work anymore, and the manual which can be downloaded from Elektrotanya doesn't contain the complete schematic.Best regardsreinhardz

author: PA0PBZ
author_rank: Super Contributor
timestamp: August 05, 2015, 12:39:46 pm
content: Try to send Jan a PM, he downloaded it.
Who makes the best test leads and acccessories? - Page 1
Forum section: electronics / testgear

author: GlowingGhoul
author_rank: Regular Contributor
timestamp: August 04, 2015, 03:59:05 pm
content: Is it Pomona? Fluke?(By "best", I mean in terms of quality, without regard to value/price. I am also referring to everyday bench use, not some exotic application).

author: dr.diesel
author_rank: Super Contributor
timestamp: August 04, 2015, 04:00:42 pm
content: I've got piles and piles of Pomona stuff, haven't failed me yet.Their mini pinchers and grabbers are very nice as well.

author: bitwelder
author_rank: Super Contributor
timestamp: August 04, 2015, 04:47:40 pm
content: There is already an ongoing thread about that subjecthttps://www.eevblog.com/forum/testgear/finest-possible-multimeter-test-leads/Or is your question different?

author: nanofrog
author_rank: Super Contributor
timestamp: August 05, 2015, 01:16:37 am
content: Quote from: GlowingGhoul on August 04, 2015, 03:59:05 pmYour location will play an important role as to what's available to you as well. If you go into your user profile and set your country, it's flag will display beneath your userID. Makes it easier on everyone.That said, there's several quality test lead makers, some you may never even heard of. But some do better with certain items than others. For example, the pogo test lead set from Fluke/Pomona aren't that wonderful, but the ones from Probemaster are much better.Test Lead Manufacturers (teir 1, no particular order):Fluke/Pomona (Fluke owns Pomona, which is owned by Danaher, which also owns Tektronix and Keithley)ProbemasterHirschmann(much easier to get in the UK/EU for example)Oldaker(very similar to Probemaster)MuellerEZ-HookOthers may be able to add to this list, as it's likely I've forgotten a couple/few.

author: GlowingGhoul
author_rank: Regular Contributor
timestamp: August 05, 2015, 03:33:29 am
content: Thanks for that comprehensive answer, just what I was looking for.

author: Electro Fan
author_rank: Super Contributor
timestamp: August 05, 2015, 03:49:36 am
content: Maybe not the best but decent with a good selection - worth a look:http://www.caltestelectronics.com
JBC CD-2BD soldering station unboxing photos - Page 1
Forum section: electronics / testgear

author: ElectronicsNewbie
author_rank: Contributor
timestamp: August 04, 2015, 08:59:21 pm
content: Hi,I'm having trouble with attaching the photos - after clicking the post button, the page refreshes and there is no content I have inserted...So here is a single preview photo:The rest is on my Dropbox:https://www.dropbox.com/sh/wrlreocr5hgep3p/AADjM5hoDt2Ndn4gA9FeikEFa?dl=0Hope you will enjoy the photos... the quality isn't the best but...

author: GlowingGhoul
author_rank: Regular Contributor
timestamp: August 04, 2015, 09:08:51 pm
content: Teardown?

author: ElectronicsNewbie
author_rank: Contributor
timestamp: August 04, 2015, 10:09:36 pm
content: Quote from: GlowingGhoul on August 04, 2015, 09:08:51 pmMaybe in the future... first of all, I need to find a solution for this issue:https://youtu.be/YmaAblWp1xg

author: mackrc1
author_rank: Contributor
timestamp: August 04, 2015, 10:37:34 pm
content: Quote from: GlowingGhoul on August 04, 2015, 09:08:51 pmThat's BB version I'm sure it pretty much the same though.

author: nanofrog
author_rank: Super Contributor
timestamp: August 04, 2015, 10:41:25 pm
content: Perhaps try a KISS approach to fix the wobble in the meantime?For example, a bit of non-corrugated cardboard from a cereal box or similar +/- sheets of paper as needed under the "offending" rubber foot to stop the wobble should fix the issue (temporarily or permanently).Once you've the height right, then add a piece of non-foam type of double sided tape between the cardboard & rubber foot (use a glue stick for any paper to the cardboard).Just a thought, as it's a PITA to have to send it back and be without it until it's replacement arrives (you may also get a refurbished unit if you do send it back).

author: ElectronicsNewbie
author_rank: Contributor
timestamp: August 04, 2015, 10:51:28 pm
content: Quote from: nanofrog on August 04, 2015, 10:41:25 pmYes, I know.I made a separate topic for this issue:https://www.eevblog.com/forum/testgear/my-little-rant-on-jbc-regarding-built-quality-of-my-new-cd-2bd-soldering-iron/I would like to know their point of view on this... for me, this is unacceptable at this price tag... Hope their R&D team will find some solution... they are working on it for a week now...

author: nanofrog
author_rank: Super Contributor
timestamp: August 05, 2015, 12:40:57 am
content: Quote from: ElectronicsNewbie on August 04, 2015, 10:51:28 pmSee other thread.
Kelvin Varley Divider as good 10K resistance - Page 1
Forum section: electronics / testgear

author: VintageNut
author_rank: Frequent Contributor
timestamp: August 04, 2015, 11:56:55 am
content: My model 2000 DMM is recently repaired and calibrated at the factory. As returned 10K range is 9.99999K ohms. A good opportunity to measure the KVD and find any good settings for a standard resistor.0.1000000 setting results in 10K output impedance that wanders no more than 3 ppm over an 8 hour period.

author: Vgkid
author_rank: Super Contributor
timestamp: August 04, 2015, 03:30:05 pm
content: That is pretty good resistance wise. I knew they would be pretty stable.
First Teardown: How old is my multimeter? TILLQUIST DT-443 - Page 1
Forum section: electronics / testgear

author: GrandTheftAuto4life
author_rank: Contributor
timestamp: May 22, 2013, 04:28:31 pm
content: Since EEV Blog'sgot me interested of what's inside my meter, I thought I'd try to make my own teardown.This meter is pretty much unknown to the web, so it's either rare or old. Possibly both.This teardown is not going to be a video though.You can read my teardown here:http://reizero.biz/projects/multimeter/dt-443.phpWhat I would like to know is the age of this product and if it was a good or a bad teardown.Also if possible, I'd like to know in which class this would probably sit in, based on build quality.

author: larry42
author_rank: Regular Contributor
timestamp: May 22, 2013, 04:54:01 pm
content: Age: It looks like a standard 80s or 90s multimeter.Rarity: kidding, right?Teardown: photos suffer from camera shake and insufficient lighting. You're not going to compete with Dave or iFixit.Meter quality: looks like they used reasonable fuses, no blast shield, no CAT ratingMy take: probably a fine meter for around the home or general lab use. I would consider it ok to test the mains with on occasion (though this is not recommended due to lack of CAT rating / adequate probes).mvhLaurens

author: kfitch42
author_rank: Frequent Contributor
timestamp: May 22, 2013, 06:50:35 pm
content: I saw two ICs with discernible date codes: 9145 and 9203. So, early 90s.

author: Lightages
author_rank: Unknown
timestamp: May 22, 2013, 06:55:22 pm
content: For an off brand meter of that vintage it is not too badly built but I would keep it away from high energy stuff. And yes you need better lighting.

author: Bored@Work
author_rank: Super Contributor
timestamp: May 22, 2013, 07:10:16 pm
content: Seems you can still buy that model in Swedenhttp://zenit.winbasonline.se/SE/Catalog/CFysik/Ellara-matapparatur/12-000443.htmlApprox. 92 Euro - special ripoff price for education institutions.

author: GrandTheftAuto4life
author_rank: Contributor
timestamp: May 23, 2013, 07:30:28 pm
content: That's interesting.I'll admit that the lightning is crap and the photos should have been taken using a stand.Hopefully some day I'll have a proper environment to work with electronics in.

author: poorchava
author_rank: Super Contributor
timestamp: May 24, 2013, 07:44:15 am
content: I can spot some voids between walls and the leads of the components. Kinda crappy soldering, as wave soldering technology was pretty advanced at that time.

author: retiredcaps
author_rank: Super Contributor
timestamp: August 04, 2015, 10:10:28 pm
content: This meter was sent into Dave for eevblog 775 (mailbag).https://www.eevblog.com/forum/blog/eevblog-775-mailbag/
Rigol DP832 Display Smearing - Page 1
Forum section: electronics / testgear

author: sacherjj
author_rank: Frequent Contributor
timestamp: July 29, 2015, 08:44:16 pm
content: Today is the first time I've seen this and I thought I would ask before I took it apart to look. I was running something on it and looked up to adjust and thought my eyes were going from too much time under the microscope. What I saw was this:I'm running 1.09 firmware. I haven't looked inside if it before, so I'm hoping I just have a temperature cycling connection issue on the LCD connector or something. Anyone run across this before?If I turn it off for a few minutes, it looks good most times on boot. Just turned in on from being cold for about 30 minutes. In the time it took to type above, the smearing started again.

author: LA7SJA
author_rank: Regular Contributor
timestamp: July 30, 2015, 06:13:28 am
content: How old is the unit and what is average room temp? Is the unit on 24/7 or just a few hours now and then? Could be a problem with the digital 5v supply due to heat. Ther is quit a few youtube videos on the DP832. But i would start as always with the powersuply of the unit.Johan-Fredrik

author: sacherjj
author_rank: Frequent Contributor
timestamp: July 30, 2015, 11:19:04 am
content: I made sure to wait until after the heat fix before getting it. It runs at most a few hours a day, average of 10 days a week. It seems to be holding working properly, short of the display. I'll try to set aside some time to take a look at it next week.

author: LA7SJA
author_rank: Regular Contributor
timestamp: July 30, 2015, 11:54:33 am
content: I am genuinely sorry for you , 6 days a week in Thailand is hard enough so I can only imagine how 10 days week feels like. If you don't find anything wrong with the power on the DP832 the fault lays in the front panel hope it's not one of the BGA solders gone bad. When I manage to regain controll of my serverpark in Norway I should be able to find the service manual for you.Johan-Fredrik

author: sacherjj
author_rank: Frequent Contributor
timestamp: August 04, 2015, 06:21:57 pm
content: Yeah, 10 days a month is a little more realistic.
re  5KY review   - Uni_T  61E  Meter   - UK/EU stockists ? - Page 1
Forum section: electronics / testgear

author: picandmix
author_rank: Frequent Contributor
timestamp: August 03, 2015, 09:18:12 pm
content: Like the sound of the Uni T 61E as feaured in 5KYs great meter review.However, seems the only places with stock for the UK are a couple of Far East sellers, but shipping from the UK.Their prices seem lower than I expected compared to those quoted on 5KY reviews.Wondered if , like Hakko, there was a thriving clone/copy market for the Uni _T meters ?Only found Rapid Electronics UK listing it, but at £79 and out of stock for 2+ months !Anyone know of a reputable UK/EU source with stock at a fair price ?

author: Deathwish
author_rank: Unknown
timestamp: August 03, 2015, 09:25:10 pm
content: only place I can see it is on amazon.co.uk for £45.19

author: retiredcaps
author_rank: Super Contributor
timestamp: August 03, 2015, 09:29:33 pm
content: Quote from: picandmix on August 03, 2015, 09:18:12 pmUni-trend, the company who makes the Uni-T multimeters, are rebranded by other companies and resold under their label.For example, Voltcraft resells some Uni-T multimeters under their own name, but wth upgraded components/safety to meet German safety regulations.I have not seen any Uni-T counterfeits.

author: picandmix
author_rank: Frequent Contributor
timestamp: August 03, 2015, 09:54:42 pm
content: Quote from: Deathwish on August 03, 2015, 09:25:10 pmIf you look at the detail, also a CN based seller, £7 dearer than ebay sellers, expect coming from the same uk stock outlet.Quote from: retiredcaps on August 03, 2015, 09:29:33 pmFrom a quick look , unable to see anything similar spec in the Voltcraft from Conrad.As you suggest, it seems the ebay / amazon Uni T ones are not likely to be counterfeits.

author: PedroDaGr8
author_rank: Super Contributor
timestamp: August 04, 2015, 05:10:07 pm
content: Quote from: picandmix on August 03, 2015, 09:54:42 pmThere is a European version of the ut61e that has upgrades input protection componets and a more proper CAT rating, plus TUV certification. This one is more expensive than the version sold in the rest of the world for the above reasons. Ones coming from China will be the cheaper less safe version.
BGA rework hot air or IR preferred?  - Page 1
Forum section: electronics / testgear

author: 0miker0
author_rank: Newbie
timestamp: August 04, 2015, 01:50:02 pm
content: My first post here so hopefully it's in the right locationI'm looking for a hot air or IR tool that someone can might be using and can highly recommend when reworking smaller BGA chips. Years ago I used an IR wand/IR preheater that I used to remove and replace smaller sized BGA and LGA chips. I've had great success but over the last few years have been outsourcing it other companies. Now i'm hoping to hand assemble the odd prototype myself and just looking for recommendations. A few other notes:- $1500.00 or so max $$- BGA pitch usually 0.8mm- not an everyday toolMike

author: Jason_Zhang
author_rank: Newbie
timestamp: August 04, 2015, 02:24:40 pm
content: I used a hot air rework station and IR preheater to solder many of BGA chips, a big problem is setting BGA chip into the PCB component area.
What's in the Box? - Page 1
Forum section: electronics / testgear

author: ant907
author_rank: Newbie
timestamp: August 11, 2015, 01:14:51 pm
content: Was digging around the scrap heap until a came across this box.Its a portable potentiometer Type 3184 D Made by H.Tinsley & Co. LtdThe inside lid has full schematic, its a bit damaged but still quite distinguishable. The guts of it looks and smells 1940-50s maybe,I know nothing about this unit or what it is used for, just thought someone may now something about it, Never heard of "Portable Potentiometer" until a found this.Any information would be great.Cheers!
European training program on Rigol test equipment - Page 1
Forum section: electronics / testgear

author: pascal_sweden
author_rank: Super Contributor
timestamp: August 04, 2015, 10:37:04 am
content: Just a question towards Rigol DS1054Z and Rigol DSA815-TG users:Where did you guys/girlslearn how to use the advanced features in your Oscilloscope or your Spectrum Analyzer?Did you just learn by doing and hands on experiments?Or did you read the manual in details? Many engineers AFAIK don't read user manualsI had courses about Fourier and Signal Processing, but never really learned on how to use all the advanced features of an Oscilloscope and a Spectrum Analyzer.Do they have affordable trainings on this topic?Maybe an idea for Rigol, to setup a European training program on test equipment, such as basic Oscilloscope principles, basic Spectrum Analyzer principles, advanced Oscilloscope features, advanced Spectrum Analyzer features, etc.The training participants could use actual Rigol test equipment during the training, and Rigol could offer a discount to the training participants when buying Rigol test equipment after the training.People would have access to an affordable training in which they can learn the basic principles and the more advanced features, and at the same time they can learn on using actual Rigol test gear, while Rigol can indirectly market their product portfolio. Win win for everybody.

author: Wuerstchenhund
author_rank: Super Contributor
timestamp: August 04, 2015, 11:22:38 am
content: Quote from: pascal_sweden on August 04, 2015, 10:37:04 amI'm not a user of those Rigol instruments so I hope you don't mind my answer.Most of the time I get familiar with a new instrument by reading the manual (yes, there are engineers for which it's not beneath them to read a operating manual) and taking a new instrument for a spin around the block (i.e. spend some time with it trying out the various functions).That's pretty common in the environments I work in.QuoteRigol? I doubt it, if only for the fact that none of their equipment can be considered "advanced" in any way. Even their top end scopes are pretty basic, as are their spectrum analyzers.QuoteAgain, because Rigol has neither the experience (as a company) nor any products which can be considered "advanced" in any way I don't think they could add much to doing advanced analysis.As basic courses go, there are already plenty of options out there. Just pick one you want.QuoteThe question is how "affordable" is training if a 3 day session easily exceeds the purchase price of a new DS1054z (or even the price of a DSA815)? Actually, how many hobbyists do spend money on training instead of teaching themselves via the vast amount of free resources on the internet?
Keysight 34470A - Free - Page 1
Forum section: electronics / testgear

author: noexperience
author_rank: Newbie
timestamp: August 04, 2015, 01:13:31 am
content: I am not a lucky guy so I did not even remember entering Keysight's Dream Bench Sweepstakes. Last week I got an email saying I was this month's lucky winner and my prize was a 34470A!I have attached some porn, I don't post much so hopefully the attachments are there.Playing around with it right now. Some things to note in comparison to Dave's review of a few years ago:You can now display dual scales on the meter.It has capacitanceThe bar graph is still wank, but I have not read the manual.This thing is going to be a lot of fun! That is the only reason I play around with electronics, because I enjoy it. I never cared much for the name Keysight, but now I'm thinking I will change my name to KeysightFanBoy!

author: noexperience
author_rank: Newbie
timestamp: August 04, 2015, 01:15:24 am
content: OK so here is the other picture I meant to post.

author: EEVblog
author_rank: Unknown
timestamp: August 04, 2015, 01:17:02 am
content: SCORE!

author: noexperience
author_rank: Newbie
timestamp: August 04, 2015, 01:22:14 am
content: Should also mention that I got a nice set of leads (in the picture,) USB cable and a copy of BenchVue. I don't think any of those things come standard with the meter.

author: Vgkid
author_rank: Super Contributor
timestamp: August 04, 2015, 01:33:03 am
content: Nice score. Ill trade you a recently calibrated hp3456a and a broken Solartron 7065 for your crappy Keysight.

author: TheSteve
author_rank: Unknown
timestamp: August 04, 2015, 01:33:24 am
content: Very cool, but it appears you need to trade it in for a Rigol!

author: noexperience
author_rank: Newbie
timestamp: August 04, 2015, 01:43:33 am
content: For what I paid for it, the Keysight is the clear bang for buck winner. I'm a hobbyist so that is way there is a lot of Rigol kit on my bench. It is all stock too.
Pls ignore...duplicate ... - Page 1
Forum section: electronics / testgear

author: Ldg
author_rank: Newbie
timestamp: August 03, 2015, 11:22:25 pm
content: I'm new here, so bear with me.I'm waiting for my SDS1072cml to arrive from amazon.Thanks for the help here to make that choice for my first dig scope.One thing I want to do with it, is to test some solar charge controllers.I also will test some 12v chargers, supposedly with de-sulfation (provides high current pulses)I want to record Voltage on one Ch and Current (through a shunt) on the other.I would like to do this over a 24 hr period.Could that be done, only using the internal memory, or would I have to record to a USB drive, and view the results on a PC?Thx for the helpLDG

author: tautech
author_rank: Super Contributor
timestamp: August 03, 2015, 11:38:53 pm
content: Welcome to the forum.An oscilloscope is not the best for extended datalogging, it will unlikely you will see any changes in detail over a 24 hr period.The manual explains the waveform recorder function and how to replay the captured data.Internal memory is used up to 6M.If it's your first scope beware of the connection method used to avoid ground loops that may damage the scope or the DUT.But I'd certainly give a try to attempt to get the data required.
Help with data logging on DSO - Page 1
Forum section: electronics / testgear

author: Ldg
author_rank: Newbie
timestamp: August 03, 2015, 11:20:48 pm
content: I'm new here, so bear with me.I'm waiting for my SDS1072cml to arrive from amazon.Thanks for the help here to make that choice for my first dig scope.One thing I want to do with it, is to test some solar charge controllers.I also will test some 12v chargers, supposedly with de-sulfation (provides high current pulses)I want to record Voltage on one Ch and Current (through a shunt) on the other.I would like to do this over a 24 hr period.Could that be done, only using the internal memory, or would I have to record to a USB drive, and view the results on a PC?Thx for the helpLDG

author: tautech
author_rank: Super Contributor
timestamp: August 03, 2015, 11:40:50 pm
content: Posted on your duplicate.Edit the other and then delete this one.
IFR_Marconi 2965A boot failed - Page 1
Forum section: electronics / testgear

author: mrf245
author_rank: Regular Contributor
timestamp: August 03, 2015, 09:01:26 am
content: HelloI have IFR/Macroni 2965A radio test set,first time It showed RTC battery lost,I replaced battery to new so machine work fine.But next day I turned on it showed Macroni LOGO,and displayed all self-test pass,first line showed"no program please download from PC".Is 2965A lost progarm or other?Any one could help me?Really appreciated.
Any dual (bipolar) slim (vertical form factor) power supplies about 0-30V/0-5A ? - Page 1
Forum section: electronics / testgear

author: Franz Zinn
author_rank: Contributor
timestamp: August 02, 2015, 11:54:14 am
content: Hi,I am looking for a linear, regulated, dual (bipolar +/-) power supply about 0-30V and 0-5A (2x) but importantly in the vertical (slim) form factor. These seem to be surprisingly difficult to find in that form factor. The only one I could find until now was the Digimess PM3006-2. And that has only a one page spec sheet, but seems to be and SMPS.I will be grateful for any suggestions here. Availability in the EU/UK will be nice.regards

author: ebastler
author_rank: Super Contributor
timestamp: August 02, 2015, 07:27:19 pm
content: You are right; these seem to be rare (or non-existent?). Maybe the transformers and heat sinks for a dual linear supply with the parameters you are looking for just take up more space than what is available in the narrow form factor?In fact, it appears to me that the Digimess PM3006 you mentioned has the "narrow" case only in the single-supply version. The two-channel version, PM3006-2, seems to have the wide body?

author: commie
author_rank: Frequent Contributor
timestamp: August 02, 2015, 07:42:04 pm
content: Not sure which country you are in?, but if its the U.K., then here:http://www.jprelec.co.uk/store.asp/c=1551/LCD-30V-Dual-meter-PSU

author: Franz Zinn
author_rank: Contributor
timestamp: August 02, 2015, 10:24:23 pm
content: Appreciate the help. Though I think "LCD 30V Dual meter PSU" is probably not a dual (or bipolar) power supply. The datasheet does not mention two outputs or bipolar outputs. I did find two others1) BK Precision 1737 (http://uk.mouser.com/ProductDetail/BK-Precision/1737/?qs=WY7X8zGOEbAxCey1NVYMEA%3D%3D)But the datasheet/manual does not mention it being Linear so I presume it is a SMPS. Also it is not clear to me if this is really a bipolar supply even though the specs say it has two outputs but the picture only shows one set of output terminals.2) Rapid HY3005F-2 (http://www.rapidonline.com/Electrical-Power/Rapid-HY3005F-2-Dual-Output-Bench-PSU-LED-1x0-30V-0-5A-1x-5V-3A-85-1943)This seems to be most promising since it clearly has dual outputs. However again no mention of it being linear and besides there is an inconsistency in the title and specs. The latter suggests it has two equivalent outputs but the title indicates otherwise.Oh well. I guess I have to contact their tech support and search continues :-(.regards
seek thermal DIY lens ? - Page 1
Forum section: electronics / testgear

author: sarepairman2
author_rank: Frequent Contributor
timestamp: August 01, 2015, 09:24:47 pm
content: So I see the seek thermal, the seek thermal XR and the seek thermal ghetto home made foam lens attachments being sold on ebay.Has anyone used all these products? Is the seek thermal XR good for use with PCBs? Or would I still need a macro lens (website specifies its usable by "electrical engineers", idk if this means electronics or electrical lol)How hard are germanium optics to procure in order to make your own lens ? (I assume if you put some machining and work into it you can make a nice home made lens that beats whatever anyone is selling? )

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: August 01, 2015, 09:49:25 pm
content: ZnSe laser-cutter lenses are readily available pretty cheaply

author: Kleinstein
author_rank: Super Contributor
timestamp: August 02, 2015, 10:04:03 am
content: Germanium is rather expensive and also quite brittle. So Grinding your own germanium lense is not a real option.A mirror is a real alternative to lenses - just needs to be a surface mirror with metal on the outside.There are instructions how to make a mirror for a asto-teleskop - in the IR range the required quality is much lower.

author: sarepairman2
author_rank: Frequent Contributor
timestamp: August 02, 2015, 02:53:31 pm
content: Quote from: Kleinstein on August 02, 2015, 10:04:03 amah yes, i noticed this playing with thermal imagers. a coarsely brushed vehicle door interior was as reflective as a mirror for the heat wavesI am wondering if the XR version of seek thermal is worth getting, considering I can make telescope style mirrors and buy ZnSe lens

author: frenky
author_rank: Unknown
timestamp: August 03, 2015, 07:01:51 am
content: This is with cheap ZnSe lens:50mm ZnSe:100mm ZnSe:TL-WR703N:
Rigol DG1022 vs DS1022A differences - Page 1
Forum section: electronics / testgear

author: Deathwish
author_rank: Unknown
timestamp: August 02, 2015, 04:29:15 pm
content: I cant see the difference , been looking at the specs on their site and I am buggered if I can see it, anyone know what it is ?

author: dadler
author_rank: Unknown
timestamp: August 02, 2015, 06:00:33 pm
content: When I was looking into these two models, the only differences I could find were:- $120- 5MHz higher sine max frequency outputI think there are some other extremely minor differences, like slightly higher max frequency in some output modes, too.It confuses me why they even bother to make two different models at this point. Confused at this, I decided to go for the DG1032Z instead.
Keithley 2220 and 2230 power supply Labview source Sweep - Page 1
Forum section: electronics / testgear

author: VintageNut
author_rank: Frequent Contributor
timestamp: July 30, 2015, 10:59:00 pm
content: I was asked via PM by a member here for my Labview KE2220/2230 Labvew VI. I actually have two. This first one performs a two channel sweep that you could use to gather the data for a transistor family of curves. I do not have one of these power supplies to check operation. I used Labview 2012 to create these. YMMV
Vintage Pifco All in One Radiometer Teardown - Page 1
Forum section: electronics / testgear

author: chrisabird
author_rank: Newbie
timestamp: July 30, 2015, 06:06:58 pm
content: This old Pifco All in One Radiometer belonged to my grandfather, it's spent the past 15 or so years in my fathers garage hidden behind a box of valves (a project for another day). I believe that these were sold from about 1930 to around 1950's for 12 Shillings and 6pence, somewhere in the region of £37GBP in todays money.So here it is, still a bit crusty & dusty, but still happily working around 56+ years later. (I say this is a tear down but there is very little in this to show)I was thrown here for a second that the common terminal had a red cap.And, all those magical insides...And still working, showing my Rigol is actually pumping out 5v.The 60mA fuse had long since crumbled into dust, it's a very odd size but hopefully i can find something to replace it.

author: AF6LJ
author_rank: Unknown
timestamp: July 30, 2015, 06:20:10 pm
content: Very Cool, thank you for sharing.
Akigawa AD-901 digital multimeter - Page 1
Forum section: electronics / testgear

author: dgonner
author_rank: Newbie
timestamp: July 29, 2015, 05:17:38 pm
content: Hello all,I have this old multimeter, a Akigawa AD-901, that I recently replaced with a Fluke 17B+.I got it from my dad some 20 years ago. The only thing I can find online about this multimeteris a german article in Computerwoche (Computer week) from 1983 that does a quick review.The multimeter is apparently from 1983, it's digital 3.5digit display and auto ranging. At thetime of introduction it was sold in Germany for 215 DMark.here's the article:http://www.computerwoche.de/a/akigawa-ad-901-stellt-sich-selbst-ein,1181429My question is this: Is this multimeter anything special and of interest to a collector or is it justa piece of old junk I should throw out?The one i have is in working condition, except the plastic bushing inside that holds the case together brokeoff. Can be fixed with some glue.I would love to know if anyone knows anything more about this meter.ciao!Dave

author: retiredcaps
author_rank: Super Contributor
timestamp: July 29, 2015, 08:59:37 pm
content: Quote from: dgonner on July 29, 2015, 05:17:38 pmDo NOT, I repeatDO NOT, throw this away. Why?It is the likely the older brother of Dave's Soar ME-533. The ME-533 was Dave's first digital multimeter. He might appreciate as a collector's item?https://www.eevblog.com/forum/chat/for-dave-soar-multimeter-the-high-cost-of-cheap-meters-fluke-ad/Is yours made in Japan? I have seen similar ones to yours labelled as Beckman. I think the OEM is Yokogawa.Dave's teardown of his beloved ME-533 (25:45 into video).

author: Wytnucls
author_rank: Super Contributor
timestamp: July 29, 2015, 09:20:16 pm
content: Akigawa Electronic Corporation (Tokyo) was making meters of their own design in the 80s. Masahiro Tanabe was the designer, with at least one US patent and a possible commercial link to Amprobe.

author: Wytnucls
author_rank: Super Contributor
timestamp: July 29, 2015, 09:45:40 pm
content: The SOAR ME-530 is virtually identical:(Sold for 18$ recently)SOAR was a Japanese company selling relabeled meters from other manufacturers.

author: dgonner
author_rank: Newbie
timestamp: July 30, 2015, 10:31:14 am
content: Thank you guys for shedding some light on this. Mine was indeed made in Japan,see the picture of the backside.I quess it may be special to some people, but it's not special in general.Maybe I'll send it to Dave for a teardown.

author: ModemHead
author_rank: Frequent Contributor
timestamp: July 30, 2015, 12:42:13 pm
content: Quote from: retiredcaps on July 29, 2015, 08:59:37 pmNot exactly the same model, but the internals are remarkably similar to this Beckman CircuitMate DM77.

author: retiredcaps
author_rank: Super Contributor
timestamp: July 30, 2015, 05:05:15 pm
content: Quote from: dgonner on July 30, 2015, 10:31:14 am+1.