hybridfree/eevblog-posts huggingface dataset:
Just got my first O-scope !! - Page 1
Forum section: electronics / testgear

author: sycho123321
author_rank: Regular Contributor
timestamp: December 13, 2014, 03:43:36 am
content: Hi all today i just ordered my first oscilloscopeit is the b&k 1477 thought i would share this and see what everybody thinks of this scopeThanks!Lukas

author: FrankenPC
author_rank: Unknown
timestamp: December 13, 2014, 04:42:50 am
content: Pics?

author: radhaz
author_rank: Regular Contributor
timestamp: December 13, 2014, 05:26:57 am
content: Looks like a decent scope. What are you going to do with it?

author: Electro Fan
author_rank: Super Contributor
timestamp: December 13, 2014, 06:11:52 am
content: Congrats on your scope!Here are some videos on the 1477 in case you haven't already seen them:The guy who made these might have some more on your model. Enjoy.EF

author: sycho123321
author_rank: Regular Contributor
timestamp: December 13, 2014, 07:19:18 am
content: Hey thanks for all the replys! im hoping to make pong (or tenis for two) for my first projecthttp://www.electronixandmore.com/projects/scopepong/index.htmlthat is just one of the guides i found and i do a bit of trobleshooting and ive been needing a scope im really excited for it to arive in the mail.

author: -jeffB
author_rank: Regular Contributor
timestamp: December 13, 2014, 04:25:51 pm
content: You're going to have LOTS of fun.I bought a new B&K Precision 1535A dual-trace 35MHz scope back in 1983 or so. The only trouble I ever had with it was some trace noise when switching vertical settings after 10 or 15 years. It's currently on loan to a pair of home-schooled twins -- actually, they're in college now, studying computer engineering. Still going strong, as far as I know.I eventually bought a used Tek 7834 and a bunch of plug-ins, because I was a bit of a gear-head. But, frankly, the simple B&K analog scope was more fun to use, and more useful for the stuff Iactuallydid (as opposed to daydreaming about). And you can't argue with 30 years of reliable service!

author: Macbeth
author_rank: Super Contributor
timestamp: December 13, 2014, 04:48:06 pm
content: ENJOY! There is nothing quite like owning your first ancient analogue 'scope.My first one was an ancient Telequipment D51 I paid 20 notes for back in 1989. It had some nice ECC83 valves and stuff like that, all glowing in good health.It had a trigger fault. I managed to get a service manual from one of the tech guys in my college, and then used that and actually used the scope to probe and diagnose itself and found a shorted diode. Worked a treat after replacing with a 1N4148. I gave that 'scope away to a friend but I think it is wasted on him.

author: sycho123321
author_rank: Regular Contributor
timestamp: December 13, 2014, 05:35:23 pm
content: Yep I bet im going to have lots of fun
Uni-T UT208 Clamp Meter question - Page 1
Forum section: electronics / testgear

author: Melkor
author_rank: Contributor
timestamp: January 25, 2014, 01:26:29 pm
content: I'm thinking about getting an UNI-T UT208 clamp meter.I see that it does have an inrush current button, however the downloaded manual is not very informative about it.As I don't have physical access to it to see how it works before buying, is there anyone that can shed some light about the inrush current functionality of this meter ?Also any info about issues with this meter that are not obvious from the specs would be appreciated.Thank You.

author: Wytnucls
author_rank: Super Contributor
timestamp: January 25, 2014, 01:51:46 pm
content: Here is short review in Russian of the similar UT207:Uni-T.??? UT 207Unfortunately, he didn't test the inrush current feature. Perhaps for good reason, as if the sampling rate is really only 3 per second, it would be rather useless.I see that the latest A models in the series have dispensed with that feature altogether.

author: Hrvoje-CRO
author_rank: Contributor
timestamp: December 12, 2014, 03:54:25 pm
content: Quote from: Wytnucls on January 25, 2014, 01:51:46 pmI disagree because thishttp://hr.rsdelivers.com/product/iso-tech/ipm245/power-meter-model-ipm245-absolute-maximum-ac-current-measurement-1000a-ac/7542769.aspxhas also sampling rate 3Hz and it is much much more expensive.
Marconi/Aeroflex 2030,2031,2032 - Page 1
Forum section: electronics / testgear

author: EMUD
author_rank: Regular Contributor
timestamp: December 12, 2014, 08:53:19 am
content: Hello,has someone the binaries for the system EPROMs (2) and the display EPROM Version 6.xxx, 7.xxx or 8,xxx for me to help me with my generator. I think the problems I have are caused by a mix of the revisions (i.e. 7.001 system and 7.003 display). Aeroflex could not give me the binaries, but they would like to sell the complete set of 3 EPROMS for about 700€ ! In this case it would be easier to buy another generator used.Please help!Many thanksEMUD
Lafayette fg39b function generator - Page 1
Forum section: electronics / testgear

author: Nanospark
author_rank: Newbie
timestamp: December 10, 2014, 04:28:47 pm
content: Has anyone had any experience with the Lafayette brand? I'm looking for low cost function generator and wondered whether anyone could give a good recommendation on this particular brand and model. Im pushing towards Instek but thought I'd get your opinions on this first.

author: jeremy
author_rank: Super Contributor
timestamp: December 10, 2014, 07:12:17 pm
content: Do you have any links? The only Lafayette I know is "galeries lafayette" which sells perfume and handbags...

author: retiredcaps
author_rank: Super Contributor
timestamp: December 10, 2014, 07:20:31 pm
content: http://www.ellepishop.it/product.php?id_product=2590

author: jeremy
author_rank: Super Contributor
timestamp: December 10, 2014, 08:12:30 pm
content: Where are you located? I would highly recommend you buy a DDS based generator that lets you key in the frequency, rather than twiddling a knob; it's much less painful when you need an exact frequency. You can get a brand new Siglent or Rigol for the price of that Lafayette on ebay (if you're in the US, probably even cheaper!).

author: PA0PBZ
author_rank: Super Contributor
timestamp: December 10, 2014, 09:08:51 pm
content: I remember Lafayette as an amateur and CB radio brand. My guess is that someone bought the name.Look at a Siglent SDG1010 which costs less and gives you a lot more.

author: Hydrawerk
author_rank: Super Contributor
timestamp: December 11, 2014, 12:29:29 am
content: It is a function generator made by MCP in China.

author: Nanospark
author_rank: Newbie
timestamp: December 11, 2014, 12:01:42 pm
content: Thanks for your feedback guys, I'll look into getting one of the models that you have suggested. The punch in one sounds good.

author: GreyWoolfe
author_rank: Unknown
timestamp: December 11, 2014, 12:56:58 pm
content: Quote from: PA0PBZ on December 10, 2014, 09:08:51 pmTheir Criterion line of floor loudspeakers were good low end speakers. I had them for years, loved the sound.

author: Hydrawerk
author_rank: Super Contributor
timestamp: December 11, 2014, 10:20:25 pm
content: I forgot to give the link.http://www.mcpsh.com/SG1639A%20B.html

author: whipman
author_rank: Contributor
timestamp: December 12, 2014, 12:22:52 am
content: Quote from: GreyWoolfe on December 11, 2014, 12:56:58 pm
Amprobe AM-520  Oddity - Page 1
Forum section: electronics / testgear

author: Marteck
author_rank: Newbie
timestamp: December 19, 2014, 02:35:41 pm
content: Hi,My first post here so if this is the wrong sub forum then I apologize but as its regarding test equipment I thought it may go here.This week I bought a couple of Amprobe AM 520's both came from two different suppliers, both are new and both appear to work as they should, there is one thing odd with both of them, they have this strange hand written initialing on the meter stand and inside the battery case, I have supplied a picture to show the marking on one meter stand.I have made inquiries with the suppliers and no one seems to know what they are, the only markings like these I have seen before are those put there by owners, unless its normal practice to let someone loose with a marker pen in the factory !Does anyone have an idea what these are or has anyone seen something similar EG: inspection marks, I am a little perplexed about this as it looks a bit well, errr naff :-(--

author: grantbob
author_rank: Unknown
timestamp: December 19, 2014, 04:13:02 pm
content: Do they both say CAL?Might be something they do after the unit has be calibrated.

author: Marteck
author_rank: Newbie
timestamp: December 19, 2014, 05:52:24 pm
content: Thanks for replying,The lettering is UL, its hand written, something I don't expect an new gear, I wondered if they where pre owned and returned but the chances of someone with initials UL returning two of these back to two separate suppliers has to be impossible so that leaves something Amprobe has done, its on the stand, the battery compartment and taking a peek inside, its on the rear case housing, so its in three places, very odd.
Rigol DS1054Z, DS1074Z or DS1104Z to bump up to 100MHz - Page 1
Forum section: electronics / testgear

author: 366Cobra
author_rank: Newbie
timestamp: December 07, 2014, 10:03:23 pm
content: Hi All,I am wanting to buy a Rigol 4 channel scope - am a hobbyist.Have been reading a lot about Rigol DS1054Z, DS1074Z and DS1104Z and bumping the first two up to 100MHz.What I have not been able to find is, if the hardware in all of them is the same and that the software selects the MHz.Since budget is an issue, can I get a DS1054Z and bump it up to a DS1104Z?Or would it make more sense to get a DS1074Z and bump it up to a DS1104ZAt the moment I do not need 100MHz, but I like things to be future proof.Any input is appreciated.ThanksMartin

author: hammy
author_rank: Unknown
timestamp: December 07, 2014, 10:34:32 pm
content: Hi Martin.Unfortunately you are asking some questions who are already discussed over and over again. ,-)Please use the search function and have a look ...The short answer is: Yes, it is the same hardware. Yes, it is possible. Yes, it is your own decision.

author: 366Cobra
author_rank: Newbie
timestamp: December 08, 2014, 11:07:14 pm
content: thanks for the answer, that made it easy.Sorry, but I was searching Google and in here for two days and could not find your answer.@hammyBesten Dank

author: hammy
author_rank: Unknown
timestamp: December 11, 2014, 12:18:28 pm
content: Quote from: 366Cobra on December 08, 2014, 11:07:14 pmKein Problem. Viel Spaß mit dem Oszi!
Agilent 6671A 8V 220A supply current regulation FAIL? - Page 1
Forum section: electronics / testgear

author: m121212
author_rank: Newbie
timestamp: December 09, 2014, 10:37:29 pm
content: I set my supply to 5V, with a 10A current limit.When I short-circuit the terminals, I get a ~200A spike, with a slow decay, taking it over 2 seconds to get to current regulation.In the attached plot, the green curve is the current, at 10mV / A. 10 amps corresponds to the horizontal cursor.Also, you can see the slow recovery to 5V when the terminals are opened in the yellow curve.I just wanted to check your opinions to make sure this is probably a hardware failure, and not some funny setting i missed on the supply controls.

author: rx8pilot
author_rank: Super Contributor
timestamp: December 09, 2014, 11:14:33 pm
content: Why do you think its broken, that may just be how it is designed. If there are big caps on the output, the current limit may take action but you still have the energy in the caps to bleed through a dead short. A slow, post alarm, recovery does not seem outrageous. I now nothing of your supply or how it was intended to behave with a dead short, but I would not intermediately say its broken. Does it work under more normal conditions? Do you have an electronic load or even a resistive load bank to test it?I have some cheap supplies that have a very slow reaction to inrush currents, but they work as they were designed and built - CHEAP. I also have some HP supplies that react very fast to transients but weigh 50lbs and are huge.

author: nctnico
author_rank: Super Contributor
timestamp: December 09, 2014, 11:36:30 pm
content: I'm pretty sure this PSU has some big caps on the output. 500ms recovery time seems slow though.

author: m121212
author_rank: Newbie
timestamp: December 10, 2014, 03:27:06 pm
content: Everything was working fine until this week. I had a dynamic load in series with the supply and a switch (short circuit).I set the load to limit at something like 10A, and the supply to limit at say 15A.I noticed I was getting much larger currents, so to simplify I removed the dynamic load entirely and measured the supply response, which was in that scope screenshot.
Motorized semi rigid cable stripper Omni Spectra - Page 1
Forum section: electronics / testgear

author: Mr Simpleton
author_rank: Unknown
timestamp: December 10, 2014, 10:53:16 am
content: "They" are cleaning out the storages here, and I see a Omni Spectra/Macom semi rigid cable stripper. Motordriven and with a manual micro meter adjustment. Remember using this 20 years agoWe are now using micro computer controlled all-singing-and-dancing-do-it-all-stripperQuestion is if I should pick it up or let it go to scrap?.... Could be handy just for getting a nice "strip" not especially for crimping SMA connectors. But my basement getting filled up with all sorts of useful gadgetsTried to search the web, but seems this one was extinct before the web and left no trace.

author: 3roomlab
author_rank: Frequent Contributor
timestamp: December 10, 2014, 11:36:22 am
content: it would be great to make a video of it working. like a video museum

author: KJDS
author_rank: Super Contributor
timestamp: December 10, 2014, 11:43:15 am
content: Quote from: 3roomlab on December 10, 2014, 11:36:22 amAren't there already enough videos of strippers on the web?

author: Mr Simpleton
author_rank: Unknown
timestamp: December 10, 2014, 02:08:15 pm
content: Well... old strippers that would be a new twist

author: Howardlong
author_rank: Super Contributor
timestamp: December 10, 2014, 07:22:07 pm
content: I'm with you, if I had the space such an item would be welcome, but on the basis that I would only use it once or twice a year, I'll stick with the sharp knife, a box of blades and rickety pipework.Edit: I wonder how much those things cost when new?

author: KJDS
author_rank: Super Contributor
timestamp: December 10, 2014, 08:00:32 pm
content: Quote from: Howardlong on December 10, 2014, 07:22:07 pmI've a feeling that the non-motorized version was about £1000 in the early 90s
TEKTRONIX: MSO2014B vs MSO2024B - Page 1
Forum section: electronics / testgear

author: onemilimeter
author_rank: Frequent Contributor
timestamp: December 09, 2014, 11:04:12 am
content: Hi...At my place, the MSO2014B (100MHz) is sold around USD300 cheaper than MSO2024B (200MHz). The specs of both scopes can be found in the following link:http://www.farnell.com/datasheets/1854407.pdfIs it worth to spend extra USD300 to buy the MSO2024B? Will MSO2024B give much advantages in measurement compared to MSO2014B? Will the 2.1ns rise time of MSO2024B a significant advantage over the 3.5ns rise time of MSO2014B?Kindly advise. Thanks.

author: Wuerstchenhund
author_rank: Super Contributor
timestamp: December 09, 2014, 11:35:15 am
content: Quote from: onemilimeter on December 09, 2014, 11:04:12 amYes, maybe, no. Who knows. Since you couldn't even be bothered to give at least some basic information about what you want to use the scope for, no-one can say if the $300 are a good investment. So I'm not sure what you expect.Is there a reason you're looking a Tek only? It's overall specs are pretty underwhelming (it doesn't even come with a network port as standard), and in the same price range you'll find other options (i.e. Keysight or Rigol) which might be the better choice.But again, without you giving some details what the scope should be used for, it's hard to say.

author: onemilimeter
author_rank: Frequent Contributor
timestamp: December 09, 2014, 02:04:16 pm
content: Thanks for reply. The scope will be mainly used for debugging power electronic conversion circuits. The switching freq is less 100kHz...

author: onemilimeter
author_rank: Frequent Contributor
timestamp: December 09, 2014, 02:15:03 pm
content: I choose Tek because it is currently in promotion by a local dealer...

author: nctnico
author_rank: Super Contributor
timestamp: December 09, 2014, 03:39:06 pm
content: In that price range I'd look at Agilent/Keysight as well.

author: onemilimeter
author_rank: Frequent Contributor
timestamp: December 09, 2014, 09:55:52 pm
content: Thanks for your reply. Would you please recommend one Agilent/Keysight scope in the price range of MSO2014B or MSO2024B?
who has replaced a Rigol oscilloscope fan because of noise? - Page 1
Forum section: electronics / testgear

author: djacobow
author_rank: Super Contributor
timestamp: August 16, 2014, 03:22:19 am
content: My DS2072 is not particularly noisy, but it's the noisest thing in my lab and it kind of bugs me. I've seen lots of people talk about replacing the fan to make their scope quieter, but I don't think I've seen anyone report back.I suspect a good portion of the noise is the wind through the grill, not the fan itself. If so, replacing the fan won't help much.Who has done it and what were your results?

author: WesleyK
author_rank: Contributor
timestamp: August 16, 2014, 08:20:04 am
content: I believe the fan itself is quite noisy, so you might want to replace the fan too. The fan rigol is using is a GLOFN GFA06015H12H which produces 36dBa of noise while doing 34m3/h. I might replace mine with a noiseblocker or noctua fan:Noiseblocker 29m3/h, 17dBa:http://www.blacknoise.com/site/de/produkte/noiseblocker-it-luefter/nb-blacksilent-pro-series/60x60x25mm.phpNoctua 29.2m3/h, 19.3dBa:http://www.noctua.at/main.php?show=productview&products_id=48&lng=en&set=1But both have a slightly lower airflow than the stock fan so I'm not sure yet. They should be much quieter though.

author: Mark_O
author_rank: Frequent Contributor
timestamp: August 16, 2014, 12:47:48 pm
content: Quote from: WesleyK on August 16, 2014, 08:20:04 amWes, it depends on what kind of environment you'll be using them in. They have to be designed to handle worst-case ambient temps. For those of us working in air-conditioned offices or homes, and not in tropical heat, I wouldn't worry at all about the 10% lower airflow on the two units you pointed out.I'll probably pick up one of the NoiseBlocker PR-2's you pointed out, if I pick up a new Rigol. So thanks for the links.

author: djacobow
author_rank: Super Contributor
timestamp: August 16, 2014, 07:29:11 pm
content: Quote from: WesleyK on August 16, 2014, 08:20:04 amThanks, guys for the feedback. I'm going to try one of these, but not the case mod.

author: Salas
author_rank: Frequent Contributor
timestamp: December 09, 2014, 08:52:14 pm
content: The DS2072 always seemed somewhat noisy to me too. I recently watched this video:Could find the specific fan type locally for ~6 Euros. So I did the mod as recommended in the video. PSU end male connector has reverse polarity on the replacement fan, so wire colors need be switched at the splice not to use the old connector for keeping the original fan intact. Air pressure did not seem as strong as original in my free air test. The video footnote says the chips temps were tested adequate though. My subjective noise result is 50% quieter and lower pitch than before. Happy about that and agreeing to the video author. Regarding heat after well warmed up with both channels running, it gives 35C at the side exit for 22C room ambient.
Datron 1071 starts in HOLD without Display and switching to CAL is impossible - Page 1
Forum section: electronics / testgear

author: e61_phil
author_rank: Frequent Contributor
timestamp: April 05, 2014, 06:39:08 pm
content: Hello again,new problems with my Datron 1071After power up it starts in HOLD mode without any display. After pressing HOLD or MAN the DMM starts to measure and light up the display. From now on everything is working fine for the RUN mode.The second problem is: I can't switch to CAL mode. After switching the Key to CAL nothing happens. No "cal" display and the function keys are acting as in RUN mode.I've measured the pullup on the CAL/RUN switch and the voltage changes as expected. I've measured the signal in and out of the tristate buffer to the data bus and the logic level is as expected.I think these problems are related to each other.Anyone any ideas?I've also started a thread in the german mikrocontroller.net forumhttp://www.mikrocontroller.net/topic/329626however, I think in the eevblog forum are more people with such a DMM.ThanksPhilipp

author: e61_phil
author_rank: Frequent Contributor
timestamp: April 15, 2014, 12:56:27 pm
content: Hello again,the problem was a wrong setting of the DIP switches for the GPIB Interface at the backside.http://lowcurrent.wordpress.com/2014/04/14/kalibrierung-des-datron-1071/Best regardsPhilipp

author: soldersplash
author_rank: Newbie
timestamp: December 05, 2014, 11:39:49 pm
content: Hi Philip,Was the IEEE address setting effecting the start up in hold issue as well as cal?Kind regards,Daniel.

author: soldersplash
author_rank: Newbie
timestamp: December 09, 2014, 09:36:14 pm
content: Now I've found and RTFM I see that it does indeed!
conducted emissions test (CE, FCC) - Page 1
Forum section: electronics / testgear

author: Zedy
author_rank: Contributor
timestamp: December 08, 2014, 03:10:30 pm
content: Dear eevblog users,Are there some requirements for laboratory grounding solution to be able perform conducted emission test (AC). I can't find any requirements. I am looking for impedance value or some physical grounding electrode configuration.Specifically I am interested, when measurement is made in anechoic chamber. Should anechoic chamber ground reference be grounded at different places or it is enough to ground it at one place.Any help would be appreciated.

author: KJDS
author_rank: Super Contributor
timestamp: December 08, 2014, 03:43:46 pm
content: Conducted emission testing requires a LISN to set the mains network impedance. It does not require a chamber.http://www.ets-lindgren.com/pdf/LisnElec.pdfIt is usually done on an earthed plate which should be grounded to the LISN and the LISN earthed to the DUT.
New Hakko FD210-01 downgraded  FX888 Analog  version - Page 1
Forum section: electronics / testgear

author: Mikek400
author_rank: Regular Contributor
timestamp: December 07, 2014, 02:05:39 pm
content: I thought this was interesting so I decided to share it.It appears here in Japan Hakko has released a downgraded version of the FX888 Analog.It is called the Hakko My Pen FD210-01 It uses a different handpiece than the FX888 and has a finer looking tip.Unfortunately it is intended to be used as a wood burner. I'm not too sure on the details since it's all in Japanese. It also lacks temperatures on the adjustment dial. It only has numbers 1-10I thought it interesting because it looks just like the FX888 Analog version except it is Orange. Check out the pictures attached at the bottom.Anyhow just found it while looking for other stuff on the internet and couldn't find anything about it in English so I decided to post here.Here are the specs.======================================Model Number FD210-01Operating Voltage AC100V 50/60HzPower Consumption 45WOperating Temperature Room Temp to 550CStation SpecsOutput Voltage AC 13VDimensions 100(W)×120(H)×130(D)mmWeight 0.8kgPen Specs 40W (13V)Pen Type 1B Type (No.T21-B1) 8K Type (No.T21-K8)Cord Length 1.2mTotal Length 95mm======================================Here is a link to it on Hakko's website. (sorry its only in Japanese)http://www.hakko.com/japan/products/hakko_my-pen_alpha_set.html#productNavThis is a link to it on Amazonhttp://www.amazon.co.jp/%E7%99%BD%E5%85%89-%E3%83%8F%E3%83%83%E3%82%B3%E3%83%BC-%E3%83%9E%E3%82%A4%E3%83%9A%E3%83%B3-%E3%82%A2%E3%83%AB%E3%83%95%E3%82%A1-FD210-01/dp/B003ZSB20Q/ref=pd_sim_diy_8?ie=UTF8&refRID=11K8QRX0QXS5YQ6XRQ4BThey also have a less useful version which is fixed temperature which is called the Hakko My Pen FD200-1.http://www.hakko.com/japan/products/hakko_my-pen.htmlhttp://www.amazon.co.jp/%E7%99%BD%E5%85%89-%E3%83%8F%E3%83%83%E3%82%B3%E3%83%BC-%E3%83%9E%E3%82%A4%E3%83%9A%E3%83%B3-%E3%82%A2%E3%83%AB%E3%83%95%E3%82%A1-FD210-01/dp/B003ZSB20Q/ref=sr_1_11?ie=UTF8&qid=1417959274&sr=8-11&keywords=hakko

author: ivan747
author_rank: Super Contributor
timestamp: December 07, 2014, 03:31:50 pm
content: I'm not into wood burning but I can only say that color scheme looks very pretty on it. It has sort of a vintage feeling to it.That said, I expect it to be top quality.The price in US dollars is about $82 at the current rate. It's 10,000 yen, more or less.

author: Mikek400
author_rank: Regular Contributor
timestamp: December 07, 2014, 04:17:50 pm
content: Yeah. I could care less about wood burning too. Just when I first found it I thought it was a soldering iron.After doing the research for making this post I found out that even though it looks like you could connect a 907 iron to it, the voltage is only 13V instead of 26V.

author: ivan747
author_rank: Super Contributor
timestamp: December 08, 2014, 11:16:04 am
content: Really they are only using the case, which is a very nice case. Sadly, they ruined the feeling of the FX-888 when they made the digital version without a knob. Now instead of retro it looks retarded.
HP 8664A Signal Generator - Page 1
Forum section: electronics / testgear

author: avvidclif
author_rank: Regular Contributor
timestamp: December 08, 2014, 05:36:18 am
content: Picked one up off of Ebay for a good price. Seems to be working Ok. Supposedly has an error message and I did find one obsecure one that doesn't seem to affect the operation (10,130,311).Anyone familiar with them and have any pointers, I'm about to go blind trying to read the OM.

author: VK5RC
author_rank: Unknown
timestamp: December 08, 2014, 06:15:15 am
content: I would use the nose test, see whats burnt etc, check the voltage rails, DC supplies. I have found the error codes often misleading and some of the diagnostic trees cumbersome .Also check the yahoo group Agilent Hewlett Packard repair. Good hunting.
So current digital oscilloscopes ever save waveforms direct to USB? - Page 1
Forum section: electronics / testgear

author: Ecklar
author_rank: Regular Contributor
timestamp: December 12, 2014, 04:18:50 am
content: The new Rigol DS2000 show memory depth of 14M and optional 56M. Do any of these current digital scopes ever use a plugged in USB stick as memory depth? It seems like to easy a solution; what am I missing? I'm new to scopes.Eck

author: H.O
author_rank: Frequent Contributor
timestamp: December 12, 2014, 06:32:27 am
content: Hi,Not sure what you mean exactly.....On most (all?) modern DSOs you can save screenshots and/or actual waveform data (once captured) to a USB drive.But if you're talking about having the USB drive as the main acquisition memory (and therefor get a memory depth of 4G for a couple of bucks) then no, it doesn't work like that.Your typical DSO captures tens of thousands of waveforms per second, each waveform cosisting of tens of thosands of bytes (depending on scope settings of course). These bytes needs to be continuosly "streamed" to memory (and from memory in order to build the waveform you see on the screen). For this you need fast RAM "tightly" tied in with the ADC's and main processing CPU/FPGA etc. Having FLASH memory on USB won't work.

author: Mark_O
author_rank: Frequent Contributor
timestamp: December 12, 2014, 07:04:24 am
content: Another way to put it would be to ask the OP, "What USB memory sticks are you aware of that write at 2 GB/sec?"A little bit of common sense can go a long way in this field.
Test Equipment Packaging Experiences Good & Bad  - Page 1
Forum section: electronics / testgear

author: tautech
author_rank: Super Contributor
timestamp: December 10, 2014, 11:18:49 pm
content: There have been a few posts in recent times about concerns of packaging upon receipt of your precious gear.These have been posted about several brands.Buyers that acquire product through the mail need to know product is well packaged to withstand any possible bad handling and heaven forbid….weather, if left unattended on your doorstep.FYI here are a few packaging photos of my recently acquired SDM3055A bench meter.Please let me walk you through NORMAL Siglent packaging ex-factory.Single units ex-factory are double boxed, both made of corrugated cardboard, however when sourced from suppliers that have received a bulk order supply, each unit will likely be supplied in single boxing.Siglent orders come to me with a single sticker warning showing: Up, Fragile and Keep Dry in international symbol form.All box folds and wings are taped closed and one corner will be stapled.Units are packaged in slip-on foam skeletal mouldings that give substantial clearance from the box to the unit.Normally these are 2 piece mouldings.Further protection is offered with goods enclosed in a perforated plastic bag with 4 small holes, double folded and double taped.This bag will also contain a small bag of Silica Gel.Power leads, probes, test leads will be in plastic bags, some re-sealable.The only exception seems to be the USB lead that is only wire tied and loose in the package.User/Quick Start manuals will have any CD placed inside the booklet for protection. Manuals often come in plastic folders, but not always.Some accessory modules (GPIB etc.) come in their own small boxes, tucked securely alongside the main unit.Of the Siglent equipment I have received, the above has always been their standard.I unpack each item and power for only 1 time and do several checks before forwarding to customers.I always add Fragile/Keep Dry stickers to boxes that may have come to me in a bulk order and then send with tracking and/or signature required.I believe this level of care, packaging and shipping/delivery is what you should expect when buying expensive equipment.Please share your good or horror stories.

author: SoundTech-LG
author_rank: Frequent Contributor
timestamp: December 11, 2014, 03:36:10 pm
content: Good info. My experience has been ZERO damages in properly double boxed packages, that would include some type of buffer between the 2 boxes, usually those pesky peanuts...

author: nctnico
author_rank: Super Contributor
timestamp: December 11, 2014, 04:38:43 pm
content: I have never had new equipment arrive in poor packaging. Second hand equipment is a different story. If it is broken a seller quickly learns his/her lesson through a Paypal claim though. I have reiceved fragile logic analyser modules which where wrapped in nothing more than a single layer of corrugated carboard.
Fluke 8010A Voltage Regulator Issues? - Page 1
Forum section: electronics / testgear

author: VintageTech
author_rank: Contributor
timestamp: December 05, 2014, 11:27:01 pm
content: I recently got a Fluke 8010 multimeter from a friend who no longer needed it. When I went to power it up, nothing happened. As I checked the supply voltages (thou shall check voltages), I realized that the voltage was around 1.25 volts and proceeded to do some head scratching. Then, the strangest thing happened. It started to work. The AC range was causing the screen to fade out. Possibly caused by a few bad caps. But other than that it was working, About 5-10 minutes later, it shut down and would not restart. As I checked the main regulator, I was shocked to find that It was well above nominal temperatures. My thoughts are that the regulator went into thermal shutdown mode and did not recover, thus causing the meter to shut off. Also keep in mind that I could have killed it. I managed to screw up another Fluke that was given to me. Simply by attempting to repair some solider joints that had failed after 20 years of being beaten by travel and use in an industrial environment.I guess I'll leave you with two questions:What else should I look for?Will I still be able to have it calibrated If I try to replace the regulator?

author: VintageTech
author_rank: Contributor
timestamp: December 06, 2014, 02:37:28 am
content: Update:Upon more troubleshooting, I concluded that there was a short in the batteries. I removed the batteries to discover that the unit is entirely functional. Repair: Success

author: radhaz
author_rank: Regular Contributor
timestamp: December 06, 2014, 03:15:42 am
content: Congratz!
Analog Dummy Load..!! - Page 1
Forum section: electronics / testgear

author: tuxitheone
author_rank: Newbie
timestamp: December 05, 2014, 01:21:37 pm
content: hey Dave, I've looked a little on your schematic on the dummy load, and i have also made a test version, but I could not quite understand way it could not adjust as I expected, so I was forced to look at schematic again .I came to change shunt resistance to a 0.10R 1W SMD resistor, in order to get it to work as I would like.Now I can adjust from 0-20 AMP without problem. So I have made a small pdf with my / your schematic in with the changes is made. Take a look at it and say what you think about it, and if there is something you think i could change, to get it to work more effectively, then just write in the forum. i'm glad to have this little thing of awesomeness, because i´m working on a Big Power Supply 0-48Vdc and 15 Amp, because i have some big motors i would like to run at full capacity, and this well do..so thanks for the schematic...

author: tom66
author_rank: Super Contributor
timestamp: December 05, 2014, 01:22:44 pm
content: Your 0.1R 1W resistor will dissipate 40 watts at 20 amps. This may shorten its life somewhat.You will need a very large heatsink to dissipate 48V * 15A = 720W. Certainly need more than one MOSFET as otherwise the SOA is going to be massively exceeded. I am assuming you do not require full current at full load voltage, but you don't say if you do.Your 10uF capacitor on the leg of your potentiometer has an effective ~6second 3RC factor, which will create a considerable "lag" when changing the load current. At best this will be irritating, but at worst it will make it hard to set the right current.You may need to add some compensation to the control loop to prevent the circuit oscillating, typically IC2A would be converted into an inverting integrator with gain, using a capacitor and resistor in parallel as feedback. IC2B would calculate the error voltage to feed into the integrator.What's with the 8uH inductor & 10uF capacitor? I take it's a noise filter but you'd do better with a good voltage regulator. The inductor and capacitor need to be bigger to have the desired effect.

author: tuxitheone
author_rank: Newbie
timestamp: December 05, 2014, 01:39:00 pm
content: hi yes I test at 1 Vdc and maximum 15 Amp else would be sick, compared to the noise damping is to avoid my internal power supply doing strange things. compared to my shunt resistor may well be that it does not hold so long, but if you have a 1R 7W resistance instead it does not work as I thought it should.and thanks for the feedback, i well look a little more on my op amps ...
Analog discovery vs Tektronix 2205 - Page 1
Forum section: electronics / testgear

author: rishabh
author_rank: Newbie
timestamp: December 05, 2014, 05:54:09 pm
content: Hi All,I have heard Dave's rant about using analog scopes. you might think I am going against what he said but here is my problem...I have a tektronix 2205 (20MHZ BW) , I am thinking of selling it and replacing with Analog Discovery usb scope (no money). Well the obvious tradeoff is BW (20mhz to 5mhz), but Discovery offers a lot of measurements (Bode plot, FFT etc., seehttp://www.ganssle.com/tem/tem233.html). Plus it has logic analyzer and signal generator, not to mention the carry-in-pocket size. Except for some shielding issues between probes (due to lack of BNC, seehttp://dangerousprototypes.com/2012/04/25/digilents-analog-design-kit/), I think it does beat the 2205.I am a budding bioinstrumentation engineer and wish to ' learn' in detail about opamp circuits (CMRR measurements, filter design, noise floor etc) and I think having more measurement options is better.What do you guys think? Should I keep the 2205 or replace it with analog discovery? Do you think analog discovery is good for serious low frequency circuit analysis.Rishabh

author: mtdoc
author_rank: Super Contributor
timestamp: December 05, 2014, 06:20:39 pm
content: The bandwidth of the Analog Discovery scope is actually closer to 10 MHz. You do want to get their $20 breakout board if you are going to use it for any signals greater than a few MHz.For $99 (with student discount) it is an incredible value IMO. The function generator and logic analyzer functions are useful as well. If you're not currently a student you can sign up for a free MOOC course like theUT embedded programming course through edXand get the discount that way. (the course if very good too!).A good short review of the Analog Discovery can be foundHereI have a soft spot for old tektronix scopes so if there is any way you can afford to keep it and still get the $99 Analog Discovery I would do that!

author: Syntax_Error
author_rank: Regular Contributor
timestamp: December 06, 2014, 03:47:02 am
content: I have the Analog Discovery and the BNC adapter board. I love it. I recommend *any* student or hobbyist to get one, but get one in addition to a scope, not instead of one.As for "serious" work, no. Not at all. It is a fantastic tool for learning and even experimenting, but it is not even a semi-professional tool. It is perfect for breadboarding, much in the same way that breadboards are perfect for rudimentary prototyping, but nothing more. Don't get rid of your scope, even if it's "only" 20MHz.If you cannot afford an Analog Discovery right now, I would save up and buy one before selling your scope. Or sell something else you own to get the money. To each his own, but this is my recommendation.

author: rishabh
author_rank: Newbie
timestamp: December 06, 2014, 04:41:37 am
content: Thanks a lot guys. So its unanimous, not sell the oscilloscope. So be it.
Can MSO5054F(G) be upgraded? - Page 1
Forum section: electronics / testgear

author: gooberPat
author_rank: Newbie
timestamp: December 02, 2014, 09:06:02 pm
content: Didn't see an answer for this, so can the MSO5054F(G) be upgraded?

author: gooberPat
author_rank: Newbie
timestamp: December 03, 2014, 04:36:47 pm
content: Quote from: gooberPat on December 02, 2014, 09:06:02 pmClass??Class??

author: miguelvp
author_rank: Super Contributor
timestamp: December 04, 2014, 03:29:33 am
content: Don't know, but a search on the forum it shows:https://www.eevblog.com/forum/testgear/hantek-tekway-dso-hack-get-200mhz-bw-for-free/msg457974/#msg457974You should search that thread.
Philips PM3266 scope opinions - Page 1
Forum section: electronics / testgear

author: dr_chernobyl
author_rank: Contributor
timestamp: December 08, 2014, 03:40:33 am
content: Hi, I would like to know is it worth it to buythis(eng translation) scope for ~220 USD(I think it is a good price, here in Croatia test equipment is very expensive, and it comes with two probes). I am a newbie but I have some experience with analog scopes.Thanks

author: coppice
author_rank: Super Contributor
timestamp: December 08, 2014, 03:53:17 am
content: That's a storage tube model. Be really careful the tube is in good condition before you buy.I have never used a Philips storage tube scope, but I used a lot of their similar 100MHz scopes without storage (around 1980 when they were new). I was always happy with them.

author: HighVoltage
author_rank: Super Contributor
timestamp: December 08, 2014, 09:03:15 am
content: For the same price you can buy a much newer Philips FLUKE Combiscope of the generation after the PM3266But then may be they are not available in your country.Can you not import from other parts of EU or US?If the PM3266 is in good working order, it is a good scope.I had several of them, a long time ago.

author: dr_chernobyl
author_rank: Contributor
timestamp: December 08, 2014, 12:13:06 pm
content: Guy says the tube is in good condition but I will of course check it out myself if I decide to buy it.@HighVoltage I can import but the shipping is very expensive and I would like to buy locally so I can check the scope out before I buy itThanks for the opinions guys

author: oldway
author_rank: Super Contributor
timestamp: December 08, 2014, 01:57:02 pm
content: I do not recommend this oscilloscope for two reasons:- The storage CRT has a limited life and it is rare to find one in good condition. However, it can often still be used without the storage function if it is not too burnt.- In Pm326X series, attenuators are different from most others Philips oscilloscopes.Philips generally use reed relays to switch the resistances of the Y input, and that is very fine.But here, this is not the case, there is no reed relay, it is contacts.These attenuators give a lot of bad contact problems ... a true disaster ...

author: dr_chernobyl
author_rank: Contributor
timestamp: December 08, 2014, 09:11:25 pm
content: Quote from: oldway onTodayat 12:57:02 AM

author: Shock
author_rank: Super Contributor
timestamp: December 08, 2014, 09:21:02 pm
content: http://www.batronix.com/shop/oscilloscopes/Rigol-DS1054Z.htmlThey are doing free shipping to EU countries. You will have to check the VAT and power requirements.
What is the best bang for the buck with thermal imagers... - Page 1
Forum section: electronics / testgear

author: alank2
author_rank: Super Contributor
timestamp: November 22, 2014, 06:17:01 pm
content: Hi Everyone,I find these things very interesting, but I see there are different classes of them. Some are "real" and have some sort of sensor that actually senses the temperature of each pixel and others seem to do some sort of combined approach that takes the temp in the center but still offers some sort of imaging. Though I would think the first type would be superior I wouldn't mind hearing the pros/cons of it vs. the second type. What is the best buy in each category (most bank for the buck!).Thanks,Alan

author: alank2
author_rank: Super Contributor
timestamp: December 03, 2014, 01:07:31 pm
content: Anyone?

author: frenky
author_rank: Unknown
timestamp: December 03, 2014, 01:54:51 pm
content: Best price/performance is probably hacked Flir E4...You have hundreds of posts about this model on the forum.Before/after the hack:If this model does not fulfil your needs there are many thermal cameras for >10,000$.

author: alank2
author_rank: Super Contributor
timestamp: December 03, 2014, 02:01:29 pm
content: When I read the thread on the E4 it sounded like the hacking was closed up and older models that could be hacked have dried up...

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: December 03, 2014, 02:54:55 pm
content: Quote from: alank2 on December 03, 2014, 02:01:29 pmCurrent version is hacked - AIUI not all the extra features but the full resolution is enabled.Best bang for fewer bucks is Seek Thermal.

author: alank2
author_rank: Super Contributor
timestamp: December 03, 2014, 03:12:32 pm
content: Quote from: mikeselectricstuff on December 03, 2014, 02:54:55 pmWhat exactly is hackable on the E4? Why would they sell a product and limit the resolution? To prevent it from competing with other models but use the same sensor?

author: eurofox
author_rank: Unknown
timestamp: December 03, 2014, 03:20:15 pm
content: Quote from: alank2 on December 03, 2014, 03:12:32 pmMy car 150HP, just by changing the CPU code 200HP and 30% more torqueWhyMarketingI suppose it is the same with Flir, more models, less cost just change the software and Fxxck the customer

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: December 03, 2014, 03:45:52 pm
content: Quote from: alank2 on December 03, 2014, 03:12:32 pmOn the original version, you could get all the features of the E8 plus some extras on top of that.It has been suggested that sensors may be selected so the E8 ones have fewer dead pixels and maybe better sensitivity but nobody has confirmed this.The E8 is poor value compared to its competitors and the Ex0 range - I doubt they sell many - ISTR they did cut the price a lot a while ago.
Another Rigol DS2072A bug - Page 1
Forum section: electronics / testgear

author: Bud
author_rank: Super Contributor
timestamp: November 30, 2014, 05:44:12 am
content: Not sure if it is specific to 2072A, you can test whatever model you have.If a channel was on 50 Ohm input impedance setting, on power up the setting has no effect, i.e. the input port is still on high impedance though the menu shows the port is on 50 Ohm.It seems the scope should be powered off for a while for the bug to be reproduced. Just power cycling does not reproduce the bug. My scope was turned off for 3 days or so. Today I used it, connected a signal gen and noticed the wrong amplitude swing, twice as it should be. The port was on 50 Ohm on power up. Toggling the port impedance in the menu fixed the issue. I am going to leave the scope powered off for the night and then will retest.

author: pa3bca
author_rank: Regular Contributor
timestamp: November 30, 2014, 04:16:32 pm
content: Yes I have noticed this too, and I am a bit surprised that I have not heard more about this bug.Reproducing it is difficult. Most of the times the scope boots up ok after shutting it down in 50 Ohm input impedance setting. (i.e 50 Ohms impedance and displayed) but every now and then it seems that in the boot sequence the 50 Ohms relay (I assume) does not engage, leaving the input on high impedance but the input impedance displayed at 50 Ohms. I have been bitten a few times by this bug, now I always cycle the input impedance between hi/low if If I need 50 Ohms and want to be sure...
Keithley 2000 forgets configuration after power-cycle - Page 1
Forum section: electronics / testgear

author: rastro
author_rank: Frequent Contributor
timestamp: December 01, 2014, 01:40:32 pm
content: Does anyone know if the Keithley 2000 loss of configuration settings after power-cycle is normal?For example if I set the thermocouple to "K" type and then power cycle it comes back up with a "J" type - which I assume is factory default.Other setting are also lost after power down like rate and number of digits displayed.I didn't see any reference in the user guide regarding keeping last power-up settings.

author: jpb
author_rank: Super Contributor
timestamp: December 01, 2014, 06:26:02 pm
content: According to the Quick Start guide there are two settings. In one it defaults to Factory settings on power on, in the other it defaults to last user settings (what you want).The instructions are on page 1-2 of the Quick Start Guide. Note the up and down arrow keys have come out as ? instead - I just did a cut and paste from the pdf:Power-on defaultsPower-on defaults are the settings the instrument assumes when it is turned on. TheModel 2000 offers two choices for the settings: factory and user. The power-on default willbe the last configuration you saved. The SAVE and SETUP keys select the two choices ofpower-on defaults.To save present configuration as user settings:1. Configure the instrument as desired for USER default.2. Press SHIFT then SAVE.3. Use the ? and ? keys to select YES or NO.4. Press ENTER.To restore factory or user settings:1. Press SHIFT then SETUP.2. Use the ? and ? keys to select FACTory or USER.3. Press ENTER.Since the basic measurement procedures in this manual assume the factory defaults, resetthe instrument to the factory settings when following step-by-step procedures. Table 2-2lists the factory default settings.

author: rastro
author_rank: Frequent Contributor
timestamp: December 04, 2014, 03:27:53 am
content: Hello jpb,I found and downloaded the quick start guide. Thanks for you help.