hybridfree/eevblog-posts huggingface dataset:
fluke 77iii- spend my money - Page 1
Forum section: electronics / testgear

author: deth502
author_rank: Frequent Contributor
timestamp: January 16, 2014, 02:20:00 am
content: im laid off now. i have a very limited time opportunity to get a nib fluke 77iii shipped to my door for about $120. if i buy it ill be in ramen noodles for the next month. from what i can see its a killer price, but ive already got a few dmm's. i surely dont "need" it. is it worth incurring the debt right now?

author: Monkeh
author_rank: Super Contributor
timestamp: January 16, 2014, 02:27:40 am
content: It's not a bad price if it's actually unused in box, but..I wouldn't.

author: deth502
author_rank: Frequent Contributor
timestamp: January 16, 2014, 02:36:00 am
content: Quote from: Monkeh on January 16, 2014, 02:27:40 amthe box looks like its been around the block once or twice, but yeah, unopened.

author: wilheldp
author_rank: Regular Contributor
timestamp: January 16, 2014, 02:41:39 am
content: You should buy it and flip it for some quick cash. You could probably get $150 for it in the BSW section on this forum (maybe even from me, if it can be proven that the meter is unused and operational).

author: deth502
author_rank: Frequent Contributor
timestamp: January 16, 2014, 08:56:53 pm
content: ok, not looking to resell, so thats 2 votes for no, 0 yes. im passing.thanks for the opinions!
Fluke Scopemeter 97 scope problem - Page 1
Forum section: electronics / testgear

author: ijchan223
author_rank: Contributor
timestamp: January 16, 2014, 02:46:28 am
content: Hi, i just picked up a fluke 97 scope-meter i am having some problems with the scope portion of it. With a sine wave input it displays something like a sawtooth .Also while in scope mode it the amplitude of the signal it display is 10x smaller than the actual signal. i doubled checked that the probe setting matches the setting on the scope , could it be a bad probes?

author: ijchan223
author_rank: Contributor
timestamp: January 16, 2014, 03:14:34 pm
content: I figured out what the problem was, it turned out to be a bad probes,. it even have somewhat of a function generator built inwhat a awesome tool

author: Anks
author_rank: Frequent Contributor
timestamp: January 16, 2014, 03:19:25 pm
content: Ive had this with the 1x 10x switch on a cheap Chinese probe
multimeters - Page 1
Forum section: electronics / testgear

author: Chopsticks
author_rank: Regular Contributor
timestamp: January 16, 2014, 04:32:02 am
content: Hi, I was going through the my grandpa's (he passed away a little while ago) old shed out on our family farm with the rest of the family and came across a couple of meters while sorting out the rubbish from whats worth keeping. the first is a Fluke 77 and the other is a hioki 'Hi Tester' model 3000 analogue meter.obviously the analogue meter will find a place on my shelf as i dont own one atm but i can't find any details on the specs of it so if anyone can point me in the right direction I'd really appreciate itas for the fluke 77 it comes with a grey holder so it's pretty old and i was wondering how this one compares to my BK Precision 2709B that i picked up about a year+ or so ago after watching daves shootout videos.i can post pictures of the hioki if neededregards,Matt

author: retiredcaps
author_rank: Super Contributor
timestamp: January 16, 2014, 07:15:59 am
content: Quote from: Chopsticks on January 16, 2014, 04:32:02 amI don't have a BK, but the Fluke 77 is a basic multimeter that is well built and likely still within its calibration specs even after close to 20+ years. The 77 continuity is slow while the BK shown in Dave's $99 shootout is really quick.

author: Chopsticks
author_rank: Regular Contributor
timestamp: January 16, 2014, 10:22:05 am
content: thanks for the info, i guess i'll keep it handy as a spare

author: lowimpedance
author_rank: Super Contributor
timestamp: January 16, 2014, 11:45:50 am
content: I have a 77 in its grey holster (my first 'purchased DMM!) and its proven very reliable indeed. It did shift slightly off spec. After a quick check on the works calibrator and a tweek all is good again. (there is only one adjustment internally for 3 v DC!).Its a solid little meter to have as a backup.
Java 7 is not allowing me to connect to my Agilent meter. - Page 1
Forum section: electronics / testgear

author: Bob S
author_rank: Contributor
timestamp: January 16, 2014, 02:20:10 am
content: I just updated to Java 7 and I now getting the following message when trying to access my meter via my LAN:Missing Application-Name manifest attribute for: http://(my LAN address)/A34972_sfp_01_00a.jarAnyone know how to fix this problem?Thanks

author: Bob S
author_rank: Contributor
timestamp: January 16, 2014, 03:37:34 am
content: Problem solved. There is a Java control panel that can be found in the following path: /windows control panel/programs/Java/security that allows you to include a given LAN address to be accepted.
Soar 4020 Teardown from mid 80's - Page 1
Forum section: electronics / testgear

author: Hagis2k
author_rank: Regular Contributor
timestamp: January 19, 2014, 06:32:43 pm
content: Well i have this old multimeter and been using this for like 20 years, been pretty ok over the years i decided it was time for a regular service/cleaningof this 28 year old multimeter as i do believe they came out on the market 1985-86 or so.Well when you look into this old device it is not the most protected on the (V) terminal Z1 must be a zener diode as it is between (V) and (Common) then later up after the red cable there is a small PTC got no CAT markings i assume that was not even "invented" back then but just look at the fuses rated at 250V and the multimeter should be able to handle 750V/AC 1000V/DChaha long before HRC fuses.But for being a 28 year old multimeter it works flawlesslyWhat did really happen to SOAR did they just vanish?

author: Zbig
author_rank: Frequent Contributor
timestamp: January 19, 2014, 07:02:22 pm
content: Quote from: Hagis2k on January 19, 2014, 06:32:43 pmWell, they definitely didn't SOAR, that's for sureSorry. It actually looks quite nice and modern for the times to my eyes. I'm also quite surprised they were already doing autoranging (or at least "soft-ranging") back then - I somehow got the idea of it being a relatively new feature. Maybe that's because no such things were available these sides back then. Well, not much else was for that matter but that's a whole different story.

author: retiredcaps
author_rank: Super Contributor
timestamp: January 19, 2014, 11:19:49 pm
content: Quote from: Hagis2k on January 19, 2014, 06:32:43 pmI'm fairly certain Yokogawa made the multimeter for SOAR (and HP at the time). The similiarities can be seen here.http://mrmodemhead.com/blog/yokogawa-7534-03-multimeter/PS. Thanks for the teardown photos. I always enjoy seeing the internals especially on meters that are not easy to get here in Canada/North America.

author: Hydrawerk
author_rank: Super Contributor
timestamp: January 20, 2014, 12:46:11 am
content: Oh, this is a very decent multimeter even today. Well, compare this SOAR to that Digimer 10...https://www.eevblog.com/forum/blog/eevblog-482-retro-iskra-multimeter-teardown/msg351343/#msg351343
Keithley 2100 /  Agilent 34461A  - Page 1
Forum section: electronics / testgear

author: London Lad
author_rank: Regular Contributor
timestamp: January 12, 2014, 12:42:57 pm
content: I'm thinking of treating my lab to a decent 6.5 digit meter. Something I know I can rely on.I seem to be coming down in favour of either the Keithley 2100 or the Agilent 34461AThe 34461A is about £240 more than the Keithley in the UK.I'm interested in anyone's views or alternative suggestions.I'm semi retired from the electronics world and mainly use my lab for general experimentation and simple prototyping with a little electronics repair thrown in for good measure.

author: TiN
author_rank: Super Contributor
timestamp: January 12, 2014, 01:00:18 pm
content: Get 34461A. 2100 isnot that old genuine Keithley anymore..Or you can hunt for Kei 2000, there are plenty of those on ebay for half a price of 34461, but conditions/cal is up to you

author: robrenz
author_rank: Super Contributor
timestamp: January 12, 2014, 03:37:21 pm
content: 34461A is well worth the twice the price difference. Those two meters are not in the same league.

author: London Lad
author_rank: Regular Contributor
timestamp: January 13, 2014, 04:41:21 pm
content: Thanks guys

author: KJDS
author_rank: Super Contributor
timestamp: January 15, 2014, 10:13:53 pm
content: I've still got a pile of Keithley 2015THD in stock, which is a 2000 with added harmonic distortion measurement.
Any experience with Toellner signal generators? - Page 1
Forum section: electronics / testgear

author: hari
author_rank: Contributor
timestamp: January 13, 2014, 11:53:32 pm
content: I could get a Toellner 7723 signal generator for small bucks, hence I'm wondering if folks here have good experiences with SGs from this manufacturer. I'd appreciate any feedback.br hari

author: qno
author_rank: Frequent Contributor
timestamp: January 14, 2014, 10:15:59 pm
content: Toellner used to be quite expensive.Never used it though. Because of the price.

author: hari
author_rank: Contributor
timestamp: January 15, 2014, 12:49:23 am
content: yeah, the price of the 7723 was 2280.- EUR without tax in 2008.

author: Nick
author_rank: Newbie
timestamp: January 15, 2014, 08:39:32 pm
content: In automotive industry Toellner is a reference testing equipment supplier. I had done a lot of tests in the past using them to simulate noise on wire harness. Positive experience with them.
DT-830B OneHungLow multimeter teardown - Page 1
Forum section: electronics / testgear

author: Fabiusp98
author_rank: Contributor
timestamp: January 14, 2014, 07:31:26 pm
content: Here it is a teardown of a fantastic OneHungLow branded DT-830B multimeterwith the exclusive SuperCheap tecnologyI bought this for 5€(7,60 A$) for a chinese store whe I started getting interested in elecronics. Now I bought another multimer, it's chinese but is at least fused and autorange.This multimeter doesn't come with a box or an instruction manual, I'll try to get the specs by hand but it seems to be 2 and a half digits.The case says 750V, 1000V, 500V, 300V max and CATII rating(I think it's a false rating), or I don't know how those things workor the designer is veeeeeery stupid.On the back there is written "To prevent damage and injury install quick acting fuses with amp/volt ratings shown", I have to install the protection fuses?!?It measues volts both AC and DC, ohms, amperes, diodes and transistor.It's powered from a 9v battery().The banana jacks are unshrouded and not compatible with the shrouded ones(yes, I tried); they're made of a tube shaped iron foil, absolute shit.There isn't any tipe of protection and there is only a chip-on-board.if I made some mistakes i accept constructive criticism since I'm a beginner.Sorry for bad english but I'm italian.

author: Rerouter
author_rank: Super Contributor
timestamp: January 14, 2014, 07:38:45 pm
content: The circuit and layout is exactly the same as jaycars $10 digitech multimeter, the moment the battery voltage drops below about 8.7V the reading starts going high,equally in my work at-least they die about once every 1.5 years, (we have a cheap little test bench where we just need to know if the voltage changes, not the value)

author: nuhamind2
author_rank: Regular Contributor
timestamp: January 14, 2014, 07:42:32 pm
content: Hey, look very similar O.oand it's my first multimeter too and still my current one

author: Fabiusp98
author_rank: Contributor
timestamp: January 14, 2014, 08:12:49 pm
content: I think the OneHungLow company had manufactured bilions of those units and the they are been rebadged over bilions of names. Probably almost everyone on this forum has or had one of those multimeters.

author: SeanB
author_rank: Super Contributor
timestamp: January 14, 2014, 08:15:45 pm
content: Just like the DT832 I have, with a slightly better board inside. Actually branded Mastech.

author: electronics man
author_rank: Frequent Contributor
timestamp: January 15, 2014, 01:40:17 pm
content: That is very poor quality the electrolytic cap looks awful it doesn't have or I can't see any isolation slots, movs or thermistors. I have a question I have never seen transistor test on any dmm whitch isn't a onehunglow cheapywhy is that?

author: Fabiusp98
author_rank: Contributor
timestamp: January 15, 2014, 03:40:07 pm
content: This is because the transistor testing is absolutely useless, they wack in this function only for marketing.
Help - CD software for Axiomet AX-DS1022C is needed. - Page 1
Forum section: electronics / testgear

author: npelov
author_rank: Frequent Contributor
timestamp: January 15, 2014, 02:44:54 pm
content: I lost the software for Axiomet AX-DS1022C oscilloscope. If someone has the drivers pls share them. Thanks!
Tektronix 1230 Logic Analyzer - Page 1
Forum section: electronics / testgear

author: mdanh2002
author_rank: Contributor
timestamp: January 14, 2014, 04:19:43 pm
content: Hi,I got this Tektronix 1230 logic analyzer for a cheap price from a Singapore electronics equipment seller. It comes with no probes or manual, just the unit. After a month of searching, I managed to purchase the probes from eBay and now I am waiting for its arrival. However I am still looking for the manual for this unit and the PC software for remote control via RS232-C. I believe the PC software for this unit is called as S43R101 by Tektronix.A Google search reveals very little useful information, apart from this advertisementhttp://www.mgoodguy.com/specs/TEK1230.pdfwhich contains some basic description on its features and part numbers, and another post on the Microchip forumhttp://www.microchip.com/forums/m81437.aspxfrom somebody who was looking for the same.Any help is appreciated! Thanks.

author: Vgkid
author_rank: Super Contributor
timestamp: January 14, 2014, 06:55:49 pm
content: Have you tried emailling Tektronix, they can be pretty good about that.

author: mdanh2002
author_rank: Contributor
timestamp: January 15, 2014, 01:46:17 am
content: I did post on the Tektronix forum with no reply yet.As for emailing technical support, I am thinking of doing so. However, as the Tek 1230 is no longer supported, I am not sure if they will even reply. Let me try.
Agilent 34461A vs Fluke 289 microamps accuracy - Page 1
Forum section: electronics / testgear

author: cio74
author_rank: Regular Contributor
timestamp: January 14, 2014, 09:56:17 pm
content: Hello,I have both of them and was trying to figure out which one to consider 'more accurate'. Agilent is 6.5 digit, did a quick test with a 73K2 0.1% tolerance resistor and a TTI Precision power supply.Got the following results (unless I screwed computing percentage), seems Agilent is actually a better tool for micro amps, but when do you get to care about that level of precision anyway?

author: robrenz
author_rank: Super Contributor
timestamp: January 14, 2014, 11:57:35 pm
content: 289 max. error at 1µA is 20% of reading34461A max. error at 1µA is 2.55% of reading 7.8X more accurate on paper.

author: SArepairman
author_rank: Frequent Contributor
timestamp: January 15, 2014, 12:17:40 am
content: Quote from: cio74 on January 14, 2014, 09:56:17 pmit's mad important when you wanna talk mad shit about other peoples meters on eevblog
6022BE Clipping at 5v - Page 1
Forum section: electronics / testgear

author: Jon86
author_rank: Frequent Contributor
timestamp: December 26, 2013, 11:59:47 am
content: I know there's already a thread about this scope, but they're all talking about development and I don't want to change the topic.Anyway, just recently I've realised that my scope's clipping at 5V! Any signals above that just show up as a perfect straight line, surely that can't be right?! It says 35v max on the input, or is that overload conditions?It has a 5V/Div setting so surely it must have an input voltage range much higher than that?Any help would be greatly appreciated.

author: Psi
author_rank: Super Contributor
timestamp: December 26, 2013, 12:03:17 pm
content: check you have the scope inputs set to match the probes (x1 x5 x10 etc)if they dont match you maybe confusing yourself.

author: Jon86
author_rank: Frequent Contributor
timestamp: December 26, 2013, 12:04:49 pm
content: Nope, all on x1.

author: Psi
author_rank: Super Contributor
timestamp: December 26, 2013, 12:07:10 pm
content: Then there's likely something wrong with itIs it like that on all channels?

author: Jon86
author_rank: Frequent Contributor
timestamp: December 26, 2013, 12:10:40 pm
content: Damn, yep it's on both channels.Is there a possibility that's how it's designed? Maybe you have to use x10 to get higher than that?Seems strange though...

author: Psi
author_rank: Super Contributor
timestamp: December 26, 2013, 12:12:51 pm
content: Actually, looking at the specs it says there is input protection of +/- 5V so maybe that's normal?Seems really weird to me though because it also says it supports 5V/div on 1xYour confusion is understandable.

author: Jon86
author_rank: Frequent Contributor
timestamp: December 26, 2013, 12:24:48 pm
content: Yeah it's a weird situation...Thanks for your help anywayI guess it could just be something hardware related, maybe a failed frontend? I think it's time to have a chat with the seller.

author: womai
author_rank: Contributor
timestamp: January 14, 2014, 07:37:46 pm
content: Actually this is the way it is designed - it does clip at this low voltage. The 35V is the maximum safe voltage to apply without causing damage to the hardware, not the maximum voltage you can actually display. It did a review of this instrument on a different thread, in a nutshell - very decent hardware but very crappy software, and a few limitations that make it unusable for anything exceeding audio frequencies...

author: Mark_O
author_rank: Frequent Contributor
timestamp: January 14, 2014, 09:56:32 pm
content: Quote from: womai on January 14, 2014, 07:37:46 pmNo argument there.QuoteIf you're referring to the hardware, that's a serious exaggeration.
Replacement 34401a VFD displays - Page 1
Forum section: electronics / testgear

author: manticore00
author_rank: Regular Contributor
timestamp: January 14, 2014, 03:35:45 am
content: Anyone have any experience buying replacement 34401a VFD displays from ebay? I found this listing on ebay:eBay auction: #251169866676but thought I'd check and see if anyone has had any horror stories or endorsements to share before I pull the trigger and order?

author: JoeD
author_rank: Contributor
timestamp: January 14, 2014, 08:36:45 pm
content: I brought one of these last year and they did a very poor job on packaging it. The package got crushed in transit and the legs were horribly mangled. Luckily it didn't affect the glass to metal seal and after a lot of careful manipulation I was able to straighten them out and fit to the unit. I raised a case with eBay and got most of my money back but it was unnecessary hassle.JoeD

author: John_L
author_rank: Contributor
timestamp: January 14, 2014, 09:08:11 pm
content: Installed one last year.Works well.
Hantek DSO5072P paused in welcome window - Page 1
Forum section: electronics / testgear

author: diegostreetbob
author_rank: Newbie
timestamp: January 14, 2014, 07:40:51 pm
content: Hello,i,m Diego from Spain, in the firs place thanks for this forum and nice to met you.The last octuber 2013, I bought a DSO5072P at sure electronics ebay store, from these days to today work fine, now when I power up the oscilloscope the screen work fine with the welcome window(Hantek, dso5072P, etc,etc,),but not continue is paused, and if I push same buttons they don,t lighting.Any idea??Thanks from Spain
Instek  GFG-8219A - Page 1
Forum section: electronics / testgear

author: Cali-Sam
author_rank: Contributor
timestamp: December 30, 2013, 01:09:09 am
content: I found a used function generator instek GFG-8219A for $100.Is that a good deal??

author: saturation
author_rank: Super Contributor
timestamp: January 14, 2014, 01:29:45 pm
content: Yes, but if you want good output stability check the 1003:http://www.amazon.com/GW-Instek-SFG-1003-Generator-Frequency/dp/B009D6PQRE/ref=sr_1_1?s=industrial&ie=UTF8&qid=1389706085&sr=1-1&keywords=instek+1003
DP832 Noisy fan - Page 1
Forum section: electronics / testgear

author: flukee
author_rank: Newbie
timestamp: January 13, 2014, 06:26:33 am
content: HiJust got my Rigol DP832 triple output PSU.It's noisy (acoustically).I've seen all the furore about the overheating part and the various Rigol revisions.Has anyone changed the fan for a quieter one?I did this modification to my Rigol DS1052E, and now it's whisper quiet! - was wondering if anyone's done it for the DP832.Also, has anyone modded up a little 5V SMPS module to replace that hot little LM317? Maybe the fan could be smaller/slower.Can't stand noisy gear.ThanksLuke
Rigol DS1074Z Programming Manul=al - Page 1
Forum section: electronics / testgear

author: echen1024
author_rank: Super Contributor
timestamp: December 24, 2013, 09:57:36 pm
content: Anyone have it? I'm anxious to play around with LXI over LAN.

author: sync
author_rank: Frequent Contributor
timestamp: December 24, 2013, 10:04:04 pm
content: It's onwww.rigol.com.

author: echen1024
author_rank: Super Contributor
timestamp: December 24, 2013, 10:32:22 pm
content: FOund it. Thanks,

author: Mark_O
author_rank: Frequent Contributor
timestamp: December 28, 2013, 08:39:20 am
content: Yes, I wrote about thisa couple weeks ago, in the 1000Z thread. There's a direct link to the manual there.The manual is dated Dec02'13, so it's pretty fresh. Sadly, it appears to have some unnecessary SCPI limitations, compared to the DS2000-series, which werebeing discussed here, just a few lines below the announcement.

author: marmad
author_rank: Super Contributor
timestamp: January 12, 2014, 02:42:18 pm
content: I'm expanding my Rigol UltraVision Utilities (RUU) to include the DS1000Z/DS1000Z-S series. I'm almost finished, but since I don't own the DSO I'm looking for an owner to help me out withthe following info (as posted here):

author: echen1024
author_rank: Super Contributor
timestamp: January 12, 2014, 08:04:54 pm
content: Hi, I will be sure to try that with the output of my Agilent 33120A
$15 quick 16 channel 20Mhz Logic Analyzer (STM32F4Discovery) - Page 1
Forum section: electronics / testgear

author: SolarSunrise
author_rank: Regular Contributor
timestamp: January 11, 2014, 08:30:03 pm
content: On a Saturday morning, I was struggling on establishing an SPI communication between my STM32F4 and an ADC chip. I did not have my logic analyzer nor my oscilloscope with me, so I thought I was screwed. But after researching on the internet, I found that an STM32F4Discovery board could be turned a 16 channel 20Mhz Logic Analyzer! Brilliant!All I had to do was flash the board with a bin file from a website. Here's the website where I got the files & the directions:-https://code.google.com/p/logicdiscovery/<= Go to the download page for the download-http://habrahabr.ru/post/165853/<= The page is in Russian, unless you can read Russian, Google Translate!Note: Thanks to the user who made this awesomeness! All thanks goes to him/herThis program interfaces with a program called open logic sniffer. It is a fully featured logic analyzer program (operating on the SUMP protocol) and is open source, available on Win, OS X, and Linux(yay!)Here's the download link:http://www.lxtreme.nl/ols/#Download/(By the way, the link is also in the guide above.)This literally saved my a$$ from hours of trouble shooting. Also, if you do not have a logic analyzer and are on a tight budget, I think this could be a solution. STM32F4Disc is only 15 bucks on digikey, so it can be a cheap, powerful alternative. Once you get a proper logic analyzer, use it as a development board, like it was suppose to beHere's the spec given on the author's Google project page:Quote

author: han
author_rank: Frequent Contributor
timestamp: January 12, 2014, 10:57:32 am
content: great,i will try it..
rigol dsa 815 firmware update - Page 1
Forum section: electronics / testgear

author: carlos10
author_rank: Newbie
timestamp: November 10, 2013, 09:24:24 am
content: hello,how can this be done in generalthanks carlos

author: echen1024
author_rank: Super Contributor
timestamp: November 10, 2013, 04:35:15 pm
content: read the manual.

author: dr.diesel
author_rank: Super Contributor
timestamp: November 10, 2013, 04:37:19 pm
content: Yes, but good luck getting Rigol to send it to you.

author: Rory
author_rank: Frequent Contributor
timestamp: November 10, 2013, 04:45:21 pm
content: Here are the directions from a Rigol PDF. It also may work by copying the firmware file to the root directory of a thumb drive and boot the device with the thumb drive in the USB.

author: Rory
author_rank: Frequent Contributor
timestamp: November 10, 2013, 05:13:25 pm
content: Quote from: dr.diesel on November 10, 2013, 04:37:19 pmWhen I had problems with my DSA815-TG, in an attempt to resolve the problem Rigol NA sent me a link to a sys file containing the newest firmware. Link still works, BTW.

author: dr.diesel
author_rank: Super Contributor
timestamp: November 10, 2013, 05:16:15 pm
content: I filled out their online firmware request form 3 times and emailed the guys I met from the Dayton Ham fest, all were ignored. I eventually got the firmware from a user here.Rigol support this known to suck, must be managed by the same group that designed the DP832 power supply.

author: Vtech
author_rank: Regular Contributor
timestamp: January 09, 2014, 12:40:15 pm
content: I've posted new firmware 00.01.08 (full name 00.01.08.00.03) dated 2013-12-02 here:https://www.eevblog.com/forum/testgear/spectrum-analyzer-rigol-dsa815/msg364423/#msg364423I've received firmware download link less than hour after requesting it on this site:http://beyondmeasure.rigoltech.com/acton/form/1579/0012:d-0001/1/index.htmLooks like you need to request it using this site if you want to have it fast. The site shown on the product page on the main rigol site looks to be broken.
Schematic/Service Manual for a Kikusui COM 3051 CRO. - Page 1
Forum section: electronics / testgear

author: aargee
author_rank: Frequent Contributor
timestamp: January 06, 2014, 12:56:12 am
content: It seems to be the season for fixing test gear on my bench.Last night the smoke let go in a big way from the rear of my little portable Kikusui oscilloscope. I reckon its an electrolytic in the AC-DC converter as the power was applied but the unit wasn't on at the time.Before I get stuck into it I thought I'd try and find a service manual/schematic for the unit. So far the web has only turned up the users manual, anyone out there with any service info?TIARob.

author: aargee
author_rank: Frequent Contributor
timestamp: January 09, 2014, 11:51:19 am
content: Turns out I didn't need a schematic, two .1uF X2 rated capacitors let go on the mains input filter circuit. Coated everything nearby with a nice brown tar like residue.Capacitors replaced and the battered old unit is back in service.
Mooshimeter - Page 1
Forum section: electronics / testgear

author: poorchava
author_rank: Super Contributor
timestamp: January 09, 2014, 08:25:30 am
content: Hey,I stumbled across this on hackaday:http://hackaday.com/2014/01/08/mooshimeter-the-why-didnt-i-think-of-that-multimeter/http://www.dragoninnovation.com/projects/34-mooshimeterThey are not shipping yet, but mention some prototypes having been distributed. Has anyone had a chance to lay hands on one of those? Any comments?I do some automotive diagnostics on roads from time to time and I always hated pulling the test leads from underneath the hood.

author: con-f-use
author_rank: Unknown
timestamp: January 09, 2014, 08:51:21 am
content: One unified place to discuss the Mooshimeterwould be nice.
Equus - Innova 3300 DMM Teardown, $9.10 worth! - Page 1
Forum section: electronics / testgear

author: smoothtalker
author_rank: Regular Contributor
timestamp: January 09, 2014, 12:15:30 am
content: I did a teardown of the Innova 3300 DMM that i purchased from Amazon with free shipping for USD9.10! Unbelievable, the accuracy is pretty damn good for a meter almost 40x cheaper than the 87v.The meter has a good solid feel to it. Nice clear digits and no creaking on the plastic. The input protections are quite crappy. but hey! it better than the Harbor Freight i'm sure! the 10A input is unfused, while the mA input has a poor litter 340mA glass fuse. is that a PTC on the voltage input? i'm not an engineer so not really sure.The top side of the board has nothing. but it's interesting to see 2 "ball bearings" on how they implement the range switch. Buttery smooth? hahaha, not quite.

author: xrunner
author_rank: Super Contributor
timestamp: January 09, 2014, 12:24:57 am
content: I love the Chinese battery names they come up with too."Golite". LOL.

author: mos6502
author_rank: Frequent Contributor
timestamp: January 09, 2014, 02:01:27 am
content: LOL, Golite. That's really funny. I think I had some that were branded "Keysight". What kind of a dumb name is that?

author: smoothtalker
author_rank: Regular Contributor
timestamp: January 09, 2014, 02:09:37 am
content: that's a sign for Agilent! Keysight Technologies instill no confidence.
Intermittent BNC Cable - Page 1
Forum section: electronics / testgear

author: tony3d
author_rank: Frequent Contributor
timestamp: January 08, 2014, 06:29:52 am
content: I ordered a MALE BNC TO BNC cable, and found out its intermittent, and only make contact when I pull on the ends slightly. Yet, when I check it with on continuity tester it's fine. What gives? It's a cheapo from eBay. The only thing I can figure is the the connectors are out of tolerance.

author: Unknown
author_rank: Unknown
timestamp: January 08, 2014, 06:33:12 am
content: Cheap BNC connectors are total shit. I have fitted thousands (mostly decent ones) so speak from experience.

author: VK5RC
author_rank: Unknown
timestamp: January 08, 2014, 06:41:16 am
content: Don't BNC come in both 75 and 50 ohm varieties, that don't fully mate, or can even damage?

author: Unknown
author_rank: Unknown
timestamp: January 08, 2014, 06:44:59 am
content: Quote from: VK5RC on January 08, 2014, 06:41:16 amPhysically they are exactly same, from a mating faces POV.

author: vk6zgo
author_rank: Super Contributor
timestamp: January 08, 2014, 07:23:56 am
content: Quote from: VK5RC on January 08, 2014, 06:41:16 amYou're thinking of "N" connectors.

author: VK5RC
author_rank: Unknown
timestamp: January 08, 2014, 07:28:00 am
content: Lurch and vk6zgo, thanks for the info, regards

author: JDubU
author_rank: Frequent Contributor
timestamp: January 08, 2014, 07:45:00 am
content: Quote from: Lurch on January 08, 2014, 06:44:59 amThey have been physically compatible since 1978 (1978 standard IEC 169-8).

author: vk6zgo
author_rank: Super Contributor
timestamp: January 08, 2014, 09:53:43 am
content: Quote from: JDubU on January 08, 2014, 07:45:00 amThey pretty much always were,that just formalised it!

author: ConKbot
author_rank: Super Contributor
timestamp: January 08, 2014, 01:17:41 pm
content: Crimp pins meant for (presumably) RG-58 which is multi-stranded, crimped onto a solid center conductor of RG-58ish cable can give nice intermittent joints like that. That or the shield breaking off from flexing, but if you can see into the back of the crimp, then you can inspect that.

author: tony3d
author_rank: Frequent Contributor
timestamp: January 08, 2014, 09:15:32 pm
content: I ordered a new Cable from Saelig, and it works great!
Power supply with log capabilities - Page 1
Forum section: electronics / testgear

author: cio74
author_rank: Regular Contributor
timestamp: January 08, 2014, 10:10:54 pm
content: Hello,I'm after a power supply which can be programmed with a list of voltage and max current, ideally with the voltage max of 60 volts and 2 amps min. There a are a few, what I need extra is the ability to create a log with the recorded values; or just the ability to save the recorded values as csv or similar, then I can produce a graph.I am not sure if Rigol 832A is a valid option (use outputs in series to get desired voltage), it seems buggy? Perhaps I'm wrong and just minor glitches?I am also considering:Tektronix PWS4602 (it has a list but not sure if it does produce logs)AIM-TTI INSTRUMENTS - QL355TP (this one seems programmable)Any opinion on the above or a recommendation?Thanks.
HP 4262 Thoughts - Page 1
Forum section: electronics / testgear

author: echen1024
author_rank: Super Contributor
timestamp: January 07, 2014, 05:07:56 pm
content: What does everyone here think about the HP/Agilent 4262 LCR meter? I know it's quite old (1983), but it seems like a decent instrument. Also, this is my first time seeing the 5 terminal test benches. How is the 5 lead test fixture better than the standard 2 lead?Thanks for the help, as I am new to LCR meters.

author: Vgkid
author_rank: Super Contributor
timestamp: January 07, 2014, 06:49:49 pm
content: How much are you getting it for? Consider the genrad 1658 better accuracy/resolution, more compute abilitie, and simple to troubleshoot. The downside is no 10khz.

author: PaulAm
author_rank: Frequent Contributor
timestamp: January 07, 2014, 08:31:24 pm
content: I picked up one of those for under $100 US.Accurate, reliable, has a low level output for in circuit tests, GPIB interface, 100/120 Hz, 1Khz and 10 KHz.Footprint is a bit large compared to modern instrumentation, otoh it's repairable if necessary. I've never had a problem with mine.

author: echen1024
author_rank: Super Contributor
timestamp: January 07, 2014, 11:07:43 pm
content: For about $100
Affordable analog/digital scope - Page 1
Forum section: electronics / testgear

author: nicksydney
author_rank: Regular Contributor
timestamp: January 07, 2014, 05:36:33 am
content: Hi,Anybody from Sydney can tell me what kind of affordable scope available (range between $100-$150) locally ? it can be used or old but something useful for someone like me doing development with MCU ?I've searched on eBay but would get opinion / advice from the experienced people in this forum.Cheers

author: vk6zgo
author_rank: Super Contributor
timestamp: January 07, 2014, 06:18:29 am
content: Try Hamfests!There are quite a few around NSW throughout the year.As a general purpose Oscilloscope,you can't go past an old analog Tektronix,but a DSO would probably meet your needs better.Unfortunately,older digital 'scopes are usually a bit overpriced,considering their quite poor performance.
HPS140I calibration fault or coding error - Page 1
Forum section: electronics / testgear

author: R_G_B_
author_rank: Frequent Contributor
timestamp: October 28, 2013, 03:20:34 pm
content: On the x10 setting the probe attentuates the signal by a factor of 10.On the hps140i I select x10 on the user interface to let the oscilloscope know that I am using a 10x probe.So with a 10 volt peak to peak sin wave @ 1Khz at the probe shows the peak to peak volatge as being 20V peak to peak.This is not correct.However when the probe is set to x1 everyhing seems correct all conditions are met.I have used two different probes and get he same result.

author: stephenjs
author_rank: Newbie
timestamp: January 06, 2014, 11:52:42 pm
content: Hello;I just purchased one - when I open it up I will try to test for same effect.Im in the LA area. I may want to network with you on this interesting DSP and its capabilities / limitations. Thank you.Steve
DS2072 bug? Incorrectly negative cursor delta = negative frequency displayed - Page 1
Forum section: electronics / testgear

author: Circlotron
author_rank: Super Contributor
timestamp: January 06, 2014, 12:21:40 pm
content: Check out this screen shot. Only noticed it long after I did the measurement. Cursor A is left and cursor B is right, presumably because of the time positions in the box. Notice delta X isminus960uS not plus. Also the inverse of this negative period is displayed asminus1.042kHz. A bug?

author: Altemir
author_rank: Contributor
timestamp: January 06, 2014, 01:37:04 pm
content: Yes. This is bug. dT=Tb-Ta. Bug is absent on page 151 from User's guide:http://www.batronix.com/pdf/Rigol/UserGuide/DS2000_UserGuide_EN.pdf(see bottom picture)What You will see, when Ta with minus and Tb with plus?

author: bogdan546
author_rank: Contributor
timestamp: January 06, 2014, 04:27:00 pm
content: 500us-(-500us)=1.000ms is correct, but at first it should be 960us

author: Circlotron
author_rank: Super Contributor
timestamp: January 10, 2014, 02:27:35 am
content: Perhaps a related matter is this statement at the bottom of page 66 of the User's Guide ->"In the horizontal direction, the screen can display a maximum of 700 points with the leftmost as 350 and the rightmost as -350."Left is negative number and right is positive number. This would indicate the age of the data point rather than the time of occurrence as is usual. Maybe the firmware writer got it right in his own mind, just different to the rest of the world.

author: Altemir
author_rank: Contributor
timestamp: January 10, 2014, 04:47:31 am
content: On MSO4024 fw00.02.00.00.04 I have no this bug.

author: marmad
author_rank: Super Contributor
timestamp: January 10, 2014, 02:04:32 pm
content: Quote from: Circlotron on January 06, 2014, 12:21:40 pmPerhaps - but you're running older firmware. The cursor box looks different in the latest version - and no negative error in my image:BTW, you'd likely get quicker/more responses/information if you posted these issues in the"REVIEW - Rigol DS2072 - First Impressions of the DS2000 series from Rigol" threadthen creating separate threads for each question.
Keithley Instruments 261 Picoampere Source on EBay - Page 1
Forum section: electronics / testgear

author: idpromnut
author_rank: Unknown
timestamp: January 06, 2014, 12:48:33 am
content: Just an FYI about this great piece of kit; I'd buy it if it wasn't for the international shipping penalty that I will pay to get it here to CanadaNo power cord, no power on check, but it's likely to work, and for 150$ with best offer, it could be very interesting for someone in the US(And no, I'm not affiliated with the seller in any way, just popped up on my routine searches on EBay)eBay auction: #201015425366Cheers,Chris

author: idpromnut
author_rank: Unknown
timestamp: January 06, 2014, 01:09:16 am
content: And in hindsight this should probably have gone in the "Buy/Sell" section, if a moderator would like to move it

author: don.r
author_rank: Frequent Contributor
timestamp: January 06, 2014, 04:22:56 am
content: Looks like it was sitting at the bottom of the ocean for the last few years! Keithley sources go for outrageous sums, however. Even the brown era bench DMMs are now fetching a pretty penny. My 196 is now 3 times what I paid for it!
EEtimes selects uCurrent on its list of inexpensive must-have's - Page 1
Forum section: electronics / testgear

author: free_electron
author_rank: Super Contributor
timestamp: December 30, 2013, 03:24:19 am
content: http://www.eetimes.com/document.asp?_mc=SM%5FEET&doc_id=1320482&page_number=2Well done old chap !

author: wilheldp
author_rank: Regular Contributor
timestamp: December 30, 2013, 03:31:11 am
content: That's awesome promotion for Dave, but did you see the gadgets surrounding the uCurrent? The oscilloscope watch, USB oscilloscope, and DSO app for smartphones.

author: free_electron
author_rank: Super Contributor
timestamp: December 30, 2013, 05:24:27 am
content: The watch is a gimmick, the usb scope is junk, the dso app for smartphones.. Meeeh

author: zapta
author_rank: Super Contributor
timestamp: December 30, 2013, 04:35:43 pm
content: The article suggests a parallel diode for better high current protection.

author: free_electron
author_rank: Super Contributor
timestamp: December 30, 2013, 04:55:08 pm
content: My first reaction when i read that suggestion was : suggestion made by a doofus....Why?Here is why:1) Anything you put in parallel will deviate current and create false readings. You'll need a diode with extremely low leakage. Both forward and reverse..... Good luck with that. And you will need to put two antiparallel....2)What is daves smallest snese resistor?10 milliohm. 0.01 ohm. 0.7 volt across that gives 70 ampere... That smd resistor went toast way before the diode could come into conduction.The next resistor is 10 ohm. That requires 70 milliamp to reach 0.7 volt. So you are burning 50 milliawatt. Ok so here the diode would work. Lets take the diode up so we can use full range. Maybe a 3.0 volt zener. Requires 300milliamp. That is 270 milliwatt... The resistor is toast again.Conclusion: written by a doofus

author: jmcdonald
author_rank: Contributor
timestamp: January 04, 2014, 10:55:37 pm
content: Quote from: free_electron on December 30, 2013, 04:55:08 pmI had the same thought the whole idea of the ucurrent is that it has a low burden voltage.

author: Napalm2002
author_rank: Regular Contributor
timestamp: January 05, 2014, 02:45:17 pm
content: We'll put free electron. I like your sense of humor in the morning!Mike
Economical 1976 multimeter: HP 3476B teardown - Page 1
Forum section: electronics / testgear

author: daqq
author_rank: Super Contributor
timestamp: December 31, 2013, 09:39:04 am
content: I peeked inside another one of my meters: The HP 3476B:http://www.daqq.eu/?p=787Not half as fun or interesting as the big one I peeked inside last time ( HP3455A :http://www.daqq.eu/?p=577), but interesting still.Enjoy!David

author: warp_foo
author_rank: Unknown
timestamp: December 31, 2013, 04:24:59 pm
content: Thanks for posting that.

author: daqq
author_rank: Super Contributor
timestamp: January 04, 2014, 06:32:09 pm
content: You're welcome. There'll be another one of a different bit of HP gear soon there.

author: Vgkid
author_rank: Super Contributor
timestamp: January 04, 2014, 11:15:38 pm
content: Thanks for the teardown.It is rather interesting to see a custom chip in an economical meter, along with the gold traces.

author: daqq
author_rank: Super Contributor
timestamp: January 05, 2014, 08:35:39 am
content: I'm guessing it's more of a hybrid actually - there's a lot of functionality on it. My guess is that there are two or more chips - one with analog switches and stuff, the second is the logic, and passives - resistors and such. Although it's strange that they didn't go all the way and have analog stuff all around the board - when they're going ASIC they might as well have integrated the integrator, AC block, polarity stuf... onto that chip and have just one IC sitting in the middle.Dunno :-)It's interesting that there are atleast two revisions of the board, and one uses the ceramic hybrid (mine), while the other one took a different path:http://www.flickr.com/photos/anachrocomputer/7514330102/#in/photostream/And, well, economical, the thing cost 225 USD in 1976. It was their bottom of the line, but I'm guessing that their line was set pretty high for the time.
Correct scientific terminology to describe bottleneck in measurement accuracy - Page 1
Forum section: electronics / testgear

author: king.oslo
author_rank: Frequent Contributor
timestamp: January 03, 2014, 09:09:57 pm
content: Hello there,I have a DUT. In the design there are several elements, A, B, C etc, which all contributes to the overall error of the DUT.I want to say that "Element A contributes with most of the error in the DUT", however I want to say this in fewer words. And I want to use terminology which is suitable for scientific publication. I though of "Element A is the bottleneck in the measurement", however, buttleneck does not sound correct, nor scientific.Any suggestions?Thank you for your time.Kind regards,Marius

author: Bored@Work
author_rank: Super Contributor
timestamp: January 03, 2014, 09:12:49 pm
content: dominates

author: king.oslo
author_rank: Frequent Contributor
timestamp: January 03, 2014, 09:19:12 pm
content: Thanks, what would you say then? "Element A dominates the measurement?"Thanks.M

author: Unknown
author_rank: Unknown
timestamp: January 03, 2014, 09:22:39 pm
content: The fault is mainly due to element A

author: Bored@Work
author_rank: Super Contributor
timestamp: January 03, 2014, 09:24:11 pm
content: Since it is about the error, something likeThe error introduced by A dominates the overall error.

author: G0HZU
author_rank: Super Contributor
timestamp: January 03, 2014, 09:32:15 pm
content: I would expect the 'error' to be described as measurement uncertainty.Therefore, I'd expect to see a measurement uncertainty stated for A, B and C and also a statement of overall measurement uncertainty.You can also make the reader aware that A is the largest contributor to the overall measurement uncertainty but usually it's obvious if the info is presented clearly.

author: G0HZU
author_rank: Super Contributor
timestamp: January 03, 2014, 09:39:58 pm
content: If you google "measurement uncertainty" you will see that it is an industry standard term. It will be used by all the major RF manufacturers of test equipment to help define the performance of their products.Note that 'uncertainty' isn't the same thing as 'absolute error' because the uncertainty refers to a potential measurement error window for the instrument (or for each sub section of it)Unless your DUT has a 'certain' or fixed/known error for A, B and C then I'd expect to see you use measurement uncertainty to describe each error.
Rohde & Schwarz APN04 Audio Frequency Generator - Page 1
Forum section: electronics / testgear

author: Mark666
author_rank: Contributor
timestamp: January 02, 2014, 08:52:02 pm
content: I bought the APN04 on eBay for a reasonable price but cannot find a PDF file containing the user manual or service manual anywhere online, I have also tried the Rohde and Schwarz website and found nothing whatsoever. The generator does come with a slide out card but it seems quite vague.I would much appreciate any help in locating either of the documents if anybody has access to them?Thank you.

author: deephaven
author_rank: Frequent Contributor
timestamp: January 02, 2014, 10:19:27 pm
content: I could only find thishttps://www.ntecusa.com/docs/APN62_data.pdfwhich gives the spec of the APN04

author: Mark666
author_rank: Contributor
timestamp: January 03, 2014, 06:42:58 pm
content: That's the only document I could find online. Thank you for looking.Might try my luck and email Rohde & Schwarz support. I have no idea on why there is such a lack of information available. Seems to be worth the £150 I paid though. The output is very nice.
Wierd looking HP 3468A - Page 1
Forum section: electronics / testgear

author: maxjenius
author_rank: Newbie
timestamp: January 03, 2014, 10:08:59 pm
content: Hello Everyone!I've been following the EEVBlog for a few years, but this is my first post...I just purchased an HP 3468A from eBay and wanted to show you the guts...I've never seen anything like this before!When I got it home, I immediately tested it and was getting no response from the input jacks, so I thought Whoo Hoo!, it's trouble shooting time! The first weird thing about it was that it had an odd connector on top. I had never seen this connection on any photos of it online...When I opened it up, I saw that it had a completely seperate board on top labled "Ohms Converter". Also, the two input jacks on the front panel were not connected at all! It was routed to the top board.So now I don't know what to do next...this threw me off, and now I want more info on it. Anybody seen this version before?P.S. Happy New Year everyone!

author: PedroDaGr8
author_rank: Super Contributor
timestamp: January 03, 2014, 11:24:24 pm
content: It almost looks like maybe they created their own scanner card. For scanning multiple items to test. I'm just guessing this based upon the large number of relays. Where does the ribbon cable go?Sent from my EVO using Tapatalk

author: maxjenius
author_rank: Newbie
timestamp: January 03, 2014, 11:46:18 pm
content: It sure does look like a custom job, interesting! The ribbon cable connects to the main board near the power switch:The power drawn to the board is bodged right on the main board on the +15V rail:Very interesting...on a side note, I disconnected the input wires and connected them back on the input jacks, and the meter works perfectlyYou can hear all those relays working when probing around...very curious as to what that board does, but yeah...definitely makes sense if it was used to automatically scan devices.