hybridfree/eevblog-posts huggingface dataset:
Just found this B&&k Precision scope 2190D, anyone have one? Why so Cheap?? - Page 1
Forum section: electronics / testgear

author: rwgast_lowlevellogicdesin
author_rank: Frequent Contributor
timestamp: February 18, 2015, 08:13:13 pm
content: So i will most likely be buying a scope tommorow!! Yay im pretty damned excited. Ive been trying to do my research and scouring web sites looking for deals!.Well my final desicion is between the Hantek DSO1502 100mhz dual channel and the Rigol DS1054Z four channel. To me they both have there pros and cons. The rigol is pretty sharp I love its display and most of all I love the little help system dave showed off during his review that seems super handy for a bench scope newb! These things can do soooo much more than my USB scope and Im not even sure what half of it is for! I also love the hardware frequency counter! The reason im still looking in to the Hantek is it is about 125 bucks cheaper, I could use that extra money twords a nice LCD and driver for one of my projects. Secondly but just as important as the price is its very hackable and 200mhz bandwidth is alot better than 100mhz! I dont see myself needing a four channel scope to much or a scope to decode serial busses so that part of the rigol is more of icing on the cake than a deciding factor.Anyways enough about all that I found this.....http://www.tequipment.net/BK/2190D/Digital-Oscilloscopes/?v=7233Does the eevblog code apply to anything on this site or just the rigols?This scope seems like any old ordinary scope 100mhz scope in its price range, but its BK precision. So im sure its built alot better and im sure the software and pc control of the scope works well out of the box. I would like to write programs to trigger my saeleae to or my usb scope from my bench scope, or vice versa.What I dont get is why is a B&K so cheap?? This guy is a B&K 25mhz 500M/s scopehttp://www.tequipment.net/BK2530B.html?v=7233and it cost more than the one above! The scope itself looks a lot different though, like an actual B&K product with the blue rubber. Is the 100mhz one above maybe just a Chinese rebage or something so B&K can stay competitive with rigol and the other chinese scopes?

author: dadler
author_rank: Unknown
timestamp: February 18, 2015, 08:32:26 pm
content: Did you really need to post another topic about what amounts to the same question? Seems like this should go in your other topic with all of the other context and comments that others have given you.

author: tautech
author_rank: Super Contributor
timestamp: February 18, 2015, 08:38:02 pm
content: Welcome to the world of rebranding.Pretty sure it's a SDS1000CNL series Siglent.The CML series are the prefered with 2M memory instead of 40K.One redeeming feature the Siglents and this one has is 400V inputs.
Who created/invented 830 multimeter? - Page 1
Forum section: electronics / testgear

author: jammet
author_rank: Newbie
timestamp: February 18, 2015, 02:19:01 am
content: Okay, so, I know that everyone knows here the 830 multimeter.It's a really cheap one and been rebranded by a lot of chinese manufacturers etc.It's been around here in the Philippines, for like 100php or $2.50 USD.Well to say, its the second multimeter I bought 5 years ago, when I was just starting electronics,just because of diode check function. It's hard to differentiate BE junction to CE junction (yes i still work with BJTs) with an analog multimeter. I still have this, just for doing something sacrificial, like shitting with an FBT/LOPTBut who really created this thing?Is it really UNI-T, MASTECH or what shit?You can see it in youtube, every electronic forums, "ITS EVERYWHERE."How this this shit spread?Who designed this crappy dmm?Also, share your experience with this.

author: Robomeds
author_rank: Frequent Contributor
timestamp: February 18, 2015, 03:29:56 am
content: Check out reply 55 in this threadhttps://www.eevblog.com/forum/reviews/harbor-freight-cen-tech-90899-small-teardown/45/It seems the basic IC was a rip off of an original Fluke asic.

author: Pasky
author_rank: Regular Contributor
timestamp: February 18, 2015, 04:03:38 am
content: That design was also my first multimeter. Would use it when I was working on my Camaro, bought it at Autozone for $3. Amazing how many clones there are of it.

author: BradC
author_rank: Super Contributor
timestamp: February 18, 2015, 05:28:44 am
content: I have about 6 of those at the moment. I buy 5 every time I get an order from Bangood at about a dollar each on special, weed out the duds and keep the rest. I have one in every car, under the seat on the motorbike and tucked away in all my travel bags. I also give them away when someone shows an interest in electronics with the caveat they are cheap and nasty, but they'll tell you enough to diagnose a fault in a car electrical system. The deal is when they eventually buy a better meter, they need to pass the cheap-o to someone else with the same rules.

author: jammet
author_rank: Newbie
timestamp: February 18, 2015, 07:24:26 pm
content: At first, I can't really do more with an analog meter, since this came, I understood, hFE, Vce, Vbe, relation of Ic to Ib to Ie.Well now, I'm dealing with FETs and IGBTs, so I can say that this shit spiked my interest in transistors, the basic of every electronic switching, and everything that I know now.
Hantek Digital Storage Oscilloscope - 200MHz, 2 Channels, 1M Memory worth $240? - Page 1
Forum section: electronics / testgear

author: XOIIO
author_rank: Super Contributor
timestamp: February 17, 2015, 10:06:36 pm
content: Hey all, it's been a few years since my analog scope was ruined by the winter because I was forced to put it in the garage (I had barely even gotten to mess around with it let alone learn to use it properly) and I've been looking for one every since but this popped up for $240, a Hantek Digital Storage Oscilloscope - 200MHz, 2 Channels, 1M Memory. According to the seller it was only used a few times, These seem to go for $400+ new. Checking to get the exact model number and see if he has the leads and other accessories.I might be able to get the price down to $200 since it's a 30 minute drive or so one way to pick it up, then I could have him hook it up to prove that it still works. He also has a signal/function generator but that's not really something I need and I couldn't afford it anyways (I'd already be putting off getting a new fender for my car since rust is starting, but this seems like a good opportunity)Should I go for it? Are these scopes any good? Any common issues with then that may be why he is selling it for that cheap? Any hacks to unlock higher frequency or more memory perhaps? 200mhz seems pretty good for hobby level stuff I think, not sure how 1mb memory is.Also wondering if there is any real good way to test that it is indeed working properly without a signal generatorEdit: He says he paid $700 for it and is firm at $240 which isn't a massive amount more though I may see if he would deliver it then as my car isn't all that fuel efficient lol. Model number DSO5202B, two 10x/1x leads and everything else it came with.

author: XOIIO
author_rank: Super Contributor
timestamp: February 17, 2015, 10:38:32 pm
content: Yeah there's also the factor of shipping, and it would be pretty much this or nothing. I'm just wondering how these scopes are overall. For example I have a power supply that caused the cd rom hard drive bay not to work (19vdc Lenovo power supply) and I wanted to look at the signal to see if there's some AC getting through or something, I'm not really sure how many practical uses I'd have for it immediately, maybe decoding serial info too, but it seems like a pretty good opportunity if the scope is alright. Watching a review right now.

author: XOIIO
author_rank: Super Contributor
timestamp: February 17, 2015, 10:56:00 pm
content: Ah seems dave did a review on these, damnit I'm going to spend the next month catching up on eevblog now lol, but I can get a good review and opinion now.

author: XOIIO
author_rank: Super Contributor
timestamp: February 17, 2015, 11:43:10 pm
content: Well that one reply got removed idk why, hopefully some others can chime in, apparently there is a decent amount of interest so I'd likely need to make the decision tomorrow.
LeCroy LT344L Repair - Page 1
Forum section: electronics / testgear

author: jmoreland79
author_rank: Regular Contributor
timestamp: February 17, 2015, 09:51:27 pm
content: We have an older LeCroy LT344L where two of the channels are now giving suspect readings at time. One channel has been iffy for a while, but with potentially two in that state that won't calibrate, it's time for a repair or upgrade.LeCroy has a "standard" repair cost of $2,500US, though it could be less according to the rep, depending on what's wrong.However, a brand new WaveSurfer 3034 350 MHz scope retails for around $5,000US. We want to stick with LeCroy as we also have AP015 current probes and the DA1855A differential amplifier.Has anyone dealt with a repair of this type? The owner is naturally pushing for the repair as it's half the cost, but I am worried about other functions tanking in the next couple years essentially making the repair a waste of money. I guess I am curious is whether a repair is more a comprehensive refurbish in which they will change out any old components effectively giving you a "like new" scope.The primary user of the LT344L is comfortable with it, so we're really not reaching for extra features or performance. But I don't want to put band aids on a failing scope over a few thousand dollars.Cheers.

author: Wuerstchenhund
author_rank: Super Contributor
timestamp: February 17, 2015, 11:05:32 pm
content: Quote from: jmoreland79 on February 17, 2015, 09:51:27 pmWhat do you mean with "iffy"? If the amplitude is too low or the waveform looks distorted then it could be one of the input amplifiers.QuoteNot cheap, but at least they still offer to repair an now roughly 18 year old scope.However, I wouldn't invest that amount in such an old scope with by today's standard low performance (500MSa/s max sampling rate). Either fix it yourself or get a replacement.QuoteWell, you also could get a 2nd hand LeCroy scope instead, i.e. a WaveRunner2 LT (the successor of your scope).QuoteThis won't be the case. LeCroy will do a board repair, i.e. remove the acquisition board/front end, find the problem and repair it.QuoteThese old WaveRunner LT scopes are built like tanks, thanks in no small part because they were manufactured by Iwatsu. If you get the problem fixed then the scope is probably fine for several years. Service Manual and schematics are available, so if you feel confident enough you could try fixing it yourself:http://www.ko4bb.com/manuals/82.69.35.198/LeCroy_LTXXX_WaveRunner1_Digital_Storage_Oscilloscope_Service_Manual.pdfHowever, it's already 16 to 18 years old, and the 2nd hand value is pretty low. If the user prefers this scope then I would consider getting a 2nd hand WaveRunner2 LT (the successor of your scope), which is faster but operates the same as your WR LT244L.
Is there good .arb waveform editing software? - Page 1
Forum section: electronics / testgear

author: BlueBill
author_rank: Regular Contributor
timestamp: February 17, 2015, 08:11:19 pm
content: I've tried Rigol's UltraWave but unless I'm missing something it's very basic and IMHO not easy to use. Any suggestions on decent waveform editors?
Oscilloscope jitter - vid 699 - Page 1
Forum section: electronics / testgear

author: Davy
author_rank: Regular Contributor
timestamp: February 15, 2015, 09:24:36 pm
content: Thanks to Dave's excellent videos, especially video 699 Rigol's problem of jitter on some of their oscilloscopes has roused my attention. I was thinking of purchasing a DS2102A, the jitter problem kinda scared me off and now keep looking at other brands as well as analogue scopes.I wonder if anyone has experience with a DS2102S series or knows if this jitter problem as been rectified.At the moment I use a HP17144A which is big and heavy, it works fine apart from a small fault on the brightness.... overdoing the brightness the screen is flooded, I do have the service manual, one of these day's I'll round to having a shufty.The scope would be used mainly for RF work say up to about 50Mhz, the reason I thought of the DS2102A was that it was capable of displaying a 144Mhz signal.... I am aware of the 3db bandwidth points and the accuracy will be way down at this frequency, the only other criteria is the scope must have OSD capeability.Thanks, Dave

author: Teneyes
author_rank: Frequent Contributor
timestamp: February 17, 2015, 06:32:14 pm
content: Quote from: Davy on February 15, 2015, 09:24:36 pmYes the bug has been correctedYou may wish to check some more blog hereI suggest the DS2072A.Add separate Arb Function. Gen.
ATTEN ADS1102CAL USBTMC, Does it actually work - Page 1
Forum section: electronics / testgear

author: lylavoie
author_rank: Newbie
timestamp: February 09, 2015, 02:46:24 am
content: Hello All,Does anyone have the USBTMC interface working on this scope? It seems like it only responds to the *IDN? command only. All other commands don't seem to return anything correctly. I've been testing this in Linux, using both the Agilent open source usbtmc driver and the National Instruments NI-VISA drivers, same behavior in both cases.I am using the commands from the Siglent programming manual, which should be the same between the two scopes. There doesn't seem to be a ATTEN programming manual anywhere on the net.Cheers,Lincoln

author: tautech
author_rank: Super Contributor
timestamp: February 09, 2015, 03:23:54 am
content: Welcome to the forum.I have some ADS software kicking around, PM me and I'll have a rat through my archives.

author: tautech
author_rank: Super Contributor
timestamp: February 10, 2015, 08:09:39 am
content: Looking through my old stuff, the drivers are very different to that used by Siglent today.There has also been a change in HW, older DSO's need Easyscope 3 and later Easyscope X.I no longer have any Atten DSO's so can't test anything for you.I also remember there where Easyscope connection problems with the English version but the Chinese worked fine.The DSO would not connect to show the green button when connected.Solution was to edit the "Lang=" line in IIRC the .ini file from CN to EN in the Chinese software.The last versions I have also include 32 & 64 bit USB drivers as attached below.I'll send you the driver files as you have PM'ed your email.EditWell you bloody Gmail won't accept inf, sys or rar files so I'll post them here....stand by.

author: lylavoie
author_rank: Newbie
timestamp: February 17, 2015, 04:49:48 am
content: Hi All,So, I finally found a combination of windows drivers and Easy Scope X that seem to work with the scope. However, using the USB sniffer, I can see the standard commands are being modified in strange ways. I've confirmed this in using the Linux USBTMC interface and sending the commands (to which the scope responds). See below for the list of commands I've pulled so far.So, the question is, does anyone have any idea why/what the "magic" bytes are before each command or where they come from?Cheers,Lincoln============================================Below are the commands with the "extra" bytes in front.These are as sent to the scope via USBTMC.============================================D9F9FFFFSTOP2AFAFFFFRUNFCF9FFFF*RSTD8F7FFFFC1: PAVA? RMS94F7FFFFC1: PAVA? PKPKF1F7FFFFC1: PAVA? ALLD7F7FFFFC2: PAVA? RMS93F7FFFFC2: PAVA? PKPKF0F7FFFFC2: PAVA? ALLF2F9FFFFASET51F9FFFFACAL ON13F9FFFFACAL OFFCFF9FFFFACAL?9BF9FFFFWFSU?2FF8FFFFWFSU NP,1000BBF8FFFFWFSU SP,0B7F8FFFFWFSU SP,475F9FFFFC1: WF?74F9FFFFC2: WF?
Amprobe AM-570 Multimeter Settings (?) - Page 1
Forum section: electronics / testgear

author: kwass
author_rank: Frequent Contributor
timestamp: February 17, 2015, 11:21:46 pm
content: In trying to find a way to defeat the auto power off function on my AM-570 multimeter I came across an interesting entry mode. Holding down the HOLD and the MAX/MIN button while turning on the meter will show all zeros on the display. Once you release these buttons the zeros will remain indicating that it's in some sort of special mode. At this point if you press the HOLD button the display will increment by 1 for each press then wrap around: e.g.: 0000 to 0009 back to 0000. Pressing the MAX/MIN button will increased the displayed value by 10 then wrap around: e.g.: 0010 - 0090 - 0000. So any value from 0000 to 0099 can be set, but not stored. Turning off the meter and turning it back on in this special mode resets it to 0000.I don't think that this is some sort of calibration mode because I don't see any change in the meter's readings when I set different values. It might be some sort of self-test mode but it seems pretty lame if it is. I was hoping that it might allow for a way to defeat the auto-off function, but so far that's not the case either.Any idea of what this is? Has anyone come across this on other meters that might use the same chip?
Scope Record SHS810 Oscilloscope Scan Mode - Page 1
Forum section: electronics / testgear

author: shackmaster
author_rank: Newbie
timestamp: February 15, 2015, 11:33:28 pm
content: I have recently purchased the Siglent SHS810. To try to record the scope I press "recorder" on front panel, press F2 for "Scope Recorder" then I get an error message that says "Recorder can only be used in Scan Mode". Now the problem is that the manual does not say how to get into "Scan Mode". Does anyone know how to do this.The software version is 3.01.02.02R2, hardware version is 1-31-3.3.

author: commongrounder
author_rank: Frequent Contributor
timestamp: February 16, 2015, 12:52:19 am
content: Slow down the horizontal timebase. When it reaches a certain time/div., the scope recorder will become available.

author: tautech
author_rank: Super Contributor
timestamp: February 16, 2015, 06:44:49 am
content: Quote from: commongrounder on February 16, 2015, 12:52:19 amExactly.SHS810 enters scan mode at a timebase setting of 100ms/div and a slow sweep will become visible.In record mode 100ms/div will give 1.2 seconds of data per sweep.To increase the internal record length a USB stick can be added.For detailed analysis of the recorded data adjust the timebase to examine the points of interest.From the datasheet:Scope RecorderRecording scope waveform continually in scan modeSupport recording, replay and zoom function7M points memory depth,18 hours recording timeMaximum 4GB in USB storage mode, 3000hours recording time

author: shackmaster
author_rank: Newbie
timestamp: February 16, 2015, 08:40:34 pm
content: Thanks, commongrounder AND tautech for the replys. Now it is working great. The instructions didn't specify how to get it into "scan mode" and I couldn't figure it out. Thanks Again!
The future of python-based instrument control - Page 1
Forum section: electronics / testgear

author: alex.forencich
author_rank: Frequent Contributor
timestamp: February 16, 2015, 10:12:27 am
content: There is an effort going on right now to build a unified community out of many existing instrument control libraries - including python-ivi, lantz, eapii, and slave - that has been spinning up over the past couple of weeks. It seems like a very good opportunity to get a strong community built up around a powerful library that we can all contribute to. The architecture will be a bit different from python-ivi, but the plan right now is to keep the extensibility of python-ivi while building a more optimized abstraction layer around python metaclasses that will hopefully present a very similar hierarchical interface while making driver development a bit less cumbersome.If anyone cares to participate in developing the specification for this new library, the discussion is going on here:https://github.com/LabPy/labpy-discussion/issues

author: cyr
author_rank: Frequent Contributor
timestamp: February 16, 2015, 08:00:41 pm
content: Sounds interesting. My python knowledge is nowhere near enough to have any input on the software design but I look forward to using it and perhaps writing some drivers for my collection of GPIB and LXI instruments...
Create a full wave  - Page 1
Forum section: electronics / testgear

author: BlueBill
author_rank: Regular Contributor
timestamp: February 16, 2015, 04:55:46 pm
content: How would you create a full wave waveform for a Rigol signal generator? Not familiar with how UltraWave works, are there any tutorials?

author: IanB
author_rank: Super Contributor
timestamp: February 16, 2015, 05:21:33 pm
content: I've never used a signal generator, but can you chain function blocks? For instance could you feed a sine wave through an absolute value function to rectify it?

author: rf-loop
author_rank: Super Contributor
timestamp: February 16, 2015, 06:01:16 pm
content: Rectified sinewave (with ideal rectifier) is something like attached image. 5 cycles 10V sinewave rectified.I do not know how to do it with Rigol generator but with Siglent just write equation:abs(10*(sin(5*x)))10 is for voltage (if property setting was default 20Vpp (-10 to +10V)) and 5 is count of cycles.|and of course without rectifier same sinewave: 10*(sin(5*x)) |In example used 5 cycle was just for this image.(Normally with arb generator it is best to do only one cycle)
Insulation meters from Megger, Agilent/Keysight - Page 1
Forum section: electronics / testgear

author: Asad
author_rank: Contributor
timestamp: February 14, 2015, 06:52:55 pm
content: I am trying to select an insulation meter for measuring insulation resistance of a solenoid assembly. The meter will be used later on for other projects too as and when required.I want it to be a handheld unit (easily transportable in toolkit for field testing) which will also be used to verify specifications of the assembly for production QC purposes. I require provision of minimum of both 50V and 100V capability with maximum range of 500-1000V. Discrete steps or adjustable voltage step size are both ok. I have found a few models which seem to suit my requirements:1 -Megger MIT410-TC2/EN(500V, 100GOhm)2 -Megger MIT430-TC2/EN(1000V, 200GOhm)3 -Keysight U1452A(1000V, 260GOhm)4 -Keysight U1453A(1000V, 260GOhm)5 -Keysight U1461A(1000V, 260GOhm)I need help with following for which I will love to have your input:1 - Which would you go for and why? Selecting the best option from amongst the five above.2 - The best supplier for Megger and Keysight in the US with lowest pricing (discounts?), preferably having above meters in stock ready-to-ship. Any advice on supplier selection is welcome.3 - Bluetooth, logging and other gimmicks are not a priority. I want a device which will do its primary job (insulation resistance measurement) day in and day out without a hiccup, can handle some rough use and doesn't require frequent re-calibration.4 - Should have an easy to use interface which doesn't need a 4-year degree to navigate and configure.Is Keysight any good now? I ask, because I have read reviews here where third party OEMs make their (Keysight's) equipment and just stamp the Agilent/Keysight logo on top.I look forward to reading your replies and your help with this query.

author: rjardina
author_rank: Contributor
timestamp: February 15, 2015, 03:55:24 pm
content: Why, these five? What is so special about this solenoid that you need 100+ GigaOhm resolution?

author: SeanB
author_rank: Super Contributor
timestamp: February 15, 2015, 04:04:36 pm
content: I would go with the second one from Megger, because I have seen them used by UK service people, and they survive being abused, dropped into cow patties ( he works doing refrigeration in rural areas) and generally rattling in a tool box, and this style from Megger survives well. Plus it is a good enough voltmeter and continuity tester as well, with good fast response and a large easy to read display.

author: Asad
author_rank: Contributor
timestamp: February 16, 2015, 11:02:47 am
content: Quote from: rjardina on February 15, 2015, 03:55:24 pmDifferent ranges are applicable to different test voltages. Generally, the higher the range at maximum voltage, the more the range at the lower voltages too.These five, because they offer 50V and 100V alongside suitable resistance range. Even Fluke's insulation tester handheld variants don't have the lower voltages with more than 1GOhm resistance. Better to buy moderately expensive once rather than buying no-name cheap multiple times.
Fluke 8010A Teardown - Page 1
Forum section: electronics / testgear

author: TheEPROM9
author_rank: Frequent Contributor
timestamp: February 10, 2015, 10:58:10 pm
content: A rather nice meter this, enjoy the teardown.

author: lowimpedance
author_rank: Super Contributor
timestamp: February 10, 2015, 11:29:32 pm
content: I have a few of these series of meters and they still get regular use. If you can pick them up cheaply then they are good to have, and some also have the battery option for feild use. (although they use NiCd so watch out for leaking and corrosion)The ceramic hybrid circuit is the TRMS AC converter. The handbook is readily available.Incidentally I did a display hack on a 8012a in a similar fashion to my 8020a which I documented here as my 1st post.Also worth checking if you have not done so is the thread by DrTaylor about old fluke meters (he worked at fluke and was the designer behind the 8060a).Interesting mod to the mA terminal !. The main fuse should be available even on ebay etc.

author: xrunner
author_rank: Super Contributor
timestamp: February 10, 2015, 11:36:31 pm
content: Picked one up at a hamfest a while back for only $10. Cleaned it up and it works just fine.

author: Vgkid
author_rank: Super Contributor
timestamp: February 11, 2015, 01:19:39 am
content: The hybrid (U8) is the true RMS converter. U4(MC1403) is the 2.5v bandgap v-Ref.I couldn't find a datasheet in the U8 hybrid for the far right 8pin dip, or the silver 8pin dip.

author: TheEPROM9
author_rank: Frequent Contributor
timestamp: February 15, 2015, 12:21:21 am
content: Thanks for the info, as said datasheets for some of the chips are at the very least difficult to find. Interestingly it is the only bench meter that has at least a little input protection.Mine came out of the uni WEEE bin, probably in there due to the missing current jack. The mod was a product of what I had to hand over what looked the nicest. I forgot to mention the RMS part of the meter which was a major mistake on my part. I will have to have a look at the eBay's

author: Shock
author_rank: Super Contributor
timestamp: February 15, 2015, 02:56:24 pm
content: Grab a copy of this if you don't have it.http://www.ko4bb.com/manuals/download.php?file=Fluke/Fluke_Catalog_1987.pdf
Custom Test Lead Blocks? - Page 1
Forum section: electronics / testgear

author: Mr. OBrien
author_rank: Contributor
timestamp: February 15, 2015, 11:37:42 am
content: These connects allow me to screw in two wires, soldier anything to the other end and plug them into the multimeter for custom testing purposes. Where can I find more of these? I had an original Fluke 87 passed down to me by my Grandfather 15 or 16 years old with these screwed on to custom leads, in the original case, and still working like new and I need to know where to get more of these to make custom plug in adapters for plugging into special connectors for testing purposes. Thanks for all your help.

author: rollatorwieltje
author_rank: Unknown
timestamp: February 15, 2015, 12:10:09 pm
content: Pomona makes those:http://www.pomonaelectronics.com/index.php?pageNum_rsProduct=1&totalRows_rsProduct=82&i=prodsub&parent=HWARE&cat=BANANAPLGJCK&getDetails=MDP for example, there are several similar ones as well.

author: Mr. OBrien
author_rank: Contributor
timestamp: February 15, 2015, 12:44:51 pm
content: Quote from: rollatorwieltje on February 15, 2015, 12:10:09 pmThank you very much! Perfect!
Help with slow scan with a DSO - Page 1
Forum section: electronics / testgear

author: Maurizio
author_rank: Contributor
timestamp: February 14, 2015, 02:31:37 pm
content: Hi and sorry for a perhaps dumb question.With a normal analog scope, if, without signal in, I set the sync to perhaps 0,5 sec, I obtain on the screen a simple dot traveling slowly from left to right.But with a digital scope, (I have a Rigol DS2102A) I obtain a line, not a traveling point. How can I have a point with a DSO? I tried to play around with many commands (also the persistence) but without success.Many ThanksMaurizio

author: electr_peter
author_rank: Unknown
timestamp: February 14, 2015, 02:43:22 pm
content: Why do you need that? You will always get a line with a DSO. CRO shows a dot because of low persistence (CRO is trying to draw a line but it can't with such timebase).If you want a dot for some reason, use XY mode display - you will get a dot moving up and down. With additional circuitry (sawtooth wave for CH2) you can add point movement from left to right.

author: Maurizio
author_rank: Contributor
timestamp: February 14, 2015, 05:41:02 pm
content: Thanks for reply. I was playing around with my function generator that have also a heartbeat wave, and I tried to simulate an "old style monitor". With my analog Tektronics is straight to have a dot jumping vertical every beat, not so with a DSO that I'm new with and I'm learning.Any other suggestion will be appreciated, thanks

author: IanB
author_rank: Super Contributor
timestamp: February 14, 2015, 06:11:04 pm
content: From memory, if I set the horizontal time base slow enough on my Rigol DS1102 I get a line drawn slowly across the screen similar to the analog dot.

author: nctnico
author_rank: Super Contributor
timestamp: February 14, 2015, 07:44:00 pm
content: Look for 'roll mode'.

author: Maurizio
author_rank: Contributor
timestamp: February 14, 2015, 11:59:54 pm
content: Yes, Ithink roll mode is the way, even if not identical.Many Thanks
BK Precision 393 Continuity - Page 1
Forum section: electronics / testgear

author: kpklukken
author_rank: Newbie
timestamp: February 14, 2015, 08:54:38 am
content: I myself purchased a model 393 and haven't seen much talk of it on this forum. While it seems to be very good value I have noticed that the continuity response seems very slow. Has anyone else had any experience with this meter? If so how well quickly has the continuity function responded for you? Also anyone else think this meter is a good value or did I just fool myself.

author: Wytnucls
author_rank: Super Contributor
timestamp: February 14, 2015, 12:54:30 pm
content: On paper, specs look alright. Except for one major concern, the low quoted true RMS bandwidth (2kHz). You may want to compare it to another DMM to confirm that. Battery life is on the short side, at 50 hours. Continuity test is supposed to trigger within 100mS, which isn't that bad. 20A fuse is only rated for 600V, instead of 1000V, for proper latest CAT rating.60,000 count, 3 year warranty, PC software included. Pretty good deal, if you can live with its few shortcomings.

author: retiredcaps
author_rank: Super Contributor
timestamp: February 14, 2015, 11:08:12 pm
content: BK Precision rarely makes it own multimeters. The BK 393 is likely some variation of Chung Instruments Equipment such as the CIE 9005.http://www.obiat.com.au/cie_model_9005_dmm.htmI will see if I can find the exact CIE version.
bm257s lcd backlight - Page 1
Forum section: electronics / testgear

author: andru
author_rank: Newbie
timestamp: February 13, 2015, 11:51:48 pm
content: I bought a few weeks ago (thanks Franky!) this DMM and the most annoying thing about it is that the backlight only stays on for about 30s. Is there any way to disable the backlight auto power off? maybe a power on function or something? Although I have tried most of the combinations i think..Except for that it's a great device and perfect for my needs

author: Lightages
author_rank: Unknown
timestamp: February 14, 2015, 02:41:54 am
content: This is my number one complaint with most multimeters. They decide if and how long you want the back light. Some companies do have adjustments or allow you to disable timeouts, but most don't.
Why do multimeter probes have a groove on their tips? - Page 1
Forum section: electronics / testgear

author: Rene
author_rank: Regular Contributor
timestamp: February 15, 2015, 10:29:41 pm
content: Hello,If you look at your typical multimeter probe, you will notice that the metal part of the tip has a groove around it by the end of the tip (see attached image).Is there a particular reason for the existence of these grooves? Is it because some fancy attachments use the grooves to firmly secured themselves to the probe tip?Thanks.

author: Richard Crowley
author_rank: Super Contributor
timestamp: February 15, 2015, 10:33:54 pm
content: I always assumed it was there to help you hold the probe on the edge of something without slipping off.

author: Andy Watson
author_rank: Super Contributor
timestamp: February 15, 2015, 10:37:39 pm
content: There are attachments that make use of the groove but I think the main use is in probing a pin or round wire. Typically you would locate a reference probe on (say) a pin and use the groove to provide positive location. Now you can look away and use the other probe to test other points in the circuit - without the reference probe slipping off or into a something it shouldn't be in!Edit: I don't know for sure - I'm just guessing - but that's the way that I use the groove.

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: February 15, 2015, 11:05:47 pm
content: Quote from: Rene on February 15, 2015, 10:29:41 pmI don't know, but I assume it is to hold those grabby things in place, you know those extra attachments you slip over the probe tip.I have DMM probes that are like needles, they narrow to a very sharp point, no groove.They have a thread for attaching stuff securely.

author: Muttley Snickers
author_rank: Unknown
timestamp: February 15, 2015, 11:07:47 pm
content: It could also be to assist when simply twisting wires on to the probes similar to the early wire wrap telephone distribution module's or MDFs. In addition the groove or indent can act as a barb when testing wiring looms, power points, blade fuse holders and all that sort of stuff so as to restrict the probes from falling out or pulling away easily.
Function generators with 50ohm termination question? - Page 1
Forum section: electronics / testgear

author: BlueBill
author_rank: Regular Contributor
timestamp: February 13, 2015, 03:00:44 am
content: I have a Rigol DS1054z-S with waveform generator, it's got a 50ohm and hi-z option.Do all function generators have 50ohm series resistance? Does enabling the 50ohm mode make it like the left image and hi-z the right image?

author: w2aew
author_rank: Super Contributor
timestamp: February 13, 2015, 03:07:40 am
content: Quote from: BlueBill on February 13, 2015, 03:00:44 amMany of them do. Some of them allow you to specify what the load impedance is (for when it is not 50, and not very high Z). The 50 output impedance is fixed. Specifying the load allows the generator to mathematically compute the voltage at the load and adjust the source amplitude as needed to achieve the user specified output amplitude at the load.My video on the topic

author: BlueBill
author_rank: Regular Contributor
timestamp: February 13, 2015, 03:59:09 pm
content: Wow thanks, and a video too! I was subscribed to your YouTube channel too, just haven't had a chance to watch them all.
Nevermind...Wrong category... - Page 1
Forum section: electronics / testgear

author: TheRuler8510
author_rank: Regular Contributor
timestamp: February 13, 2015, 02:59:15 am
content: Post Deleted...EDIT** Oops, I put this message in the wrong category...I will copy it to the projects category. Editing tools won't let me delete it completely.**EDIT
ADALM1000 - no manuals, (source only) software for Mac / Linux unusable - Page 1
Forum section: electronics / testgear

author: ralphrmartin
author_rank: Frequent Contributor
timestamp: February 13, 2015, 05:30:00 pm
content: Anyone bought an ADALM1000? - If not, don't.http://wiki.analog.com/university/tools/m1kIt looks quite neat as a learning tool. However, when the box came, it said the analog site has manuals, demos, and software for Windows / Mac / Linux.Sadly the Analog site lacks any of these. The Pixelpulse software is only to be found on github. There are no binaries, and the build instructions for a Mac / Linux are garbled at best, needing some debugging.So, I'm sending mine back. The hardware may be great (maybe), but lacking these resources, it is useless.I'm shocked analog could release something in this state.

author: Lukas
author_rank: Frequent Contributor
timestamp: February 13, 2015, 07:47:07 pm
content: Yeah, the linux build instructions are missing some steps. It built just fine for me with:Code:git clone --recursive https://github.com/signalspec/pixelpulse2cd pixelpulse2/mkdir buildcd build/qmake ..make./pixelpulse2

author: ralphrmartin
author_rank: Frequent Contributor
timestamp: February 15, 2015, 08:42:08 pm
content: I tried following the instructions to run the prebuilt Windows version, on Windows 7. It just crashes with "PixelPulse2 stopped working".Does it run and do anything after building it on Linux?

author: shabaz
author_rank: Frequent Contributor
timestamp: February 16, 2015, 01:16:12 am
content: Yes, it works very well on Linux! Step-by-step instructions are available.See here:http://www.element14.com/community/groups/test-and-measurement/blog/2015/02/14/getting-started-with-the-active-learning-module-adalm1000

author: ralphrmartin
author_rank: Frequent Contributor
timestamp: February 16, 2015, 10:58:14 pm
content: Unfortunately, there are still many issues. E.g.Those instructions are for Ubuntu, but do not work on Debian (but don't blame Shabaz, he's trying to help) - they are specific to a particular variant of unix. Various people are reporting problems finding libusb even after following instructions - not just on Linux but other systems too.To build this software needs Qt5, but unfortunately other software may need Qt4 and not be compatible with Qt5. At least in some cases, both cannot be installed together.Ultimately, while I realise this is a low cost device, the claims on the back of the box and on the Analog web site (e.g. of tutorials, examples and the like) are far different to reality.Life is too short to debug someone's hobby project which is being marketed as if it were a serious learning tool.
Old PSU (PMC Power Mate Corp, UNI-88), scared to burn down house! Pics Incuded - Page 1
Forum section: electronics / testgear

author: rwgast_lowlevellogicdesin
author_rank: Frequent Contributor
timestamp: February 11, 2015, 08:34:21 am
content: So I was walking the swap meet the other day and I found this old PSU...its an adjustable linear supply 0-34v, 1.5A. Its pretty old and crusty but for 8 bucks the transformer alone was worth the cost, especially with all those taps. Its based on a 3n3055 power transistor, the build quality inside looks pretty nice, the axial components are sleeved around there leeds, there is what looks like a huge GE cap (maybe oil based) almost half the size of the transformer inside.I haven't stripped it down any farther than this, I plan to tear it totally down and clean it up after the baby goes to sleep tonight! Ive been wanting to build a digital adjustable voltage supply with current limiting for a while. I figure this could be a good clean linear base supply for the project. All you would have to do is add the current limiting and a micro to this bad boy.Ive got to say Im a bit worried about plugging it in though. I cant find any manual for it, but from an image search those pins for -out, -sense, +sense, +out, and AC in originally had clips like the ones used to hook up speakers. Thing just had a mains wire shoddily soldered to the AC pins when I bought it, and as you can see in the picture all the DC out and sense pins are soldered togather with a little wire. I originally thought those sense pins were for current, but I dont see any kind of a shunt resistor anywhere near them.Does anyone know about this psu, have a manual, or can just tell by looking at it what + and - sense do and how they are suppose to be used (i.e read with a meter or something else)? Also this thing looks pretty tough and the parts are pretty good quality from what I can tell, would this make a pretty clean supply? Originally I was going to use a 24v radio shack transformer with some switching regulators to pre track adjustable linear regulators, but if this is a working good quality clean DC power supply i may as well clean it up and use it instead.

author: SoundTech-LG
author_rank: Frequent Contributor
timestamp: February 12, 2015, 04:44:59 pm
content: by any chance, did you mean 2N3055

author: Nerull
author_rank: Frequent Contributor
timestamp: February 12, 2015, 11:05:52 pm
content: Quote from: rwgast_lowlevellogicdesin on February 11, 2015, 08:34:21 amSense is almost always used for voltage regulation. That is where the power supply measures its output voltage. Having separate sense terminals allows you to connect sense wires directly to the power input of the DUT and the powersupply will automatically account for voltage drop on the leads. When not being used with sense wires they should be connected to the outputs or the power supply may not regulate at all and some can even be damaged.
HP 3852A GPIB timeouts - Page 1
Forum section: electronics / testgear

author: davorin
author_rank: Unknown
timestamp: February 11, 2015, 06:25:46 pm
content: Evnin' (o;Just testing a HP 3852A with the TC 44708A muxer and logging data with Cacti...Experiencing after few GPIB readings a long timeout of around 10 seconds....then it goes back to normal...Set now a higher timeout value in gpib.conf....seems better now when logging the data....But what's the point in having such a device with amuxer capable of switching 450 channels/sec and then wait 10 seconds for the data? (o;

author: bingo600
author_rank: Super Contributor
timestamp: February 11, 2015, 06:34:41 pm
content: Quote from: davorin on February 11, 2015, 06:25:46 pmSuggestions:Do you have EOI / EOT / EOS trouble ?What is the settings of the HP for (termination ?) , EOI or ??If EOT , does it trig on CR or LF ?/Bingo

author: davorin
author_rank: Unknown
timestamp: February 11, 2015, 06:39:46 pm
content: Here we are again (o;Guess I have to do some deeper reading into the GPIB bus ;-)What I have in gpib.conf:Code:gpib.conf:interface {minor = 1board_type = "agilent_82357a"name = "agilent2"pad = 0sad = 0timeout = T3seos = 0x0aset-bin = noset-eot = yes/* Assert EOI with last byte on writes */master = yes}device {minor = 1name = "3852A"pad = 9sad = 0timeout = T30seos = 0x0a}What puzzles me is the fact that this simple snippet reads it out just fine within few milliseconds for lets say 10 times...then it takes around 10 seconds....and goes back to normal again...Code:#!/usr/bin/pythonimport Gpibimport sys# command = sys.argva = Gpib.Gpib('3852A')a.write('CONFMEAS TEMPK,500')temp = float(a.read(60))temp = int(100000 * temp)print tempMaybe something with the commands I am doing wrong (o;Though the graph looks fine now with timeout set to 30 seconds:

author: bingo600
author_rank: Super Contributor
timestamp: February 11, 2015, 06:59:04 pm
content: He..He , yes we have been here beforeExample:On my HP 3458A i have to send : END ALWAYS , as the first command in order to get the meter to set EOI along with the last byte sent.If i don't, the linux gpib always times out before returning any data , and some data are lost.Try to see what it says in the manual.On some older HP's, EOI was selected on the "gpib addr" dipswitch on the back.If you can get your instrumnt to set the EOI line when sending last byte , that's the 99.9% easiest way to signal "End of Data" to linux-gpib./Bingo

author: bingo600
author_rank: Super Contributor
timestamp: February 11, 2015, 08:43:55 pm
content: In manual have a look @pg 5.14 , END command (though it seems to set EOI default by pwr on)The unit seems to have an advances buffering system , make sure you don't overrun it.I'd run a few manual measurements via ibterm/Bingo
HP 6623A precision power supply any good? - Page 1
Forum section: electronics / testgear

author: ninjastrike
author_rank: Contributor
timestamp: February 12, 2015, 10:24:14 am
content: Hello,I looking for a new power supply, and have come across the HP/agilent 6623A.Has anyone had any experience with this model ?Any issues or drawbacks ?If any please leave them below.The seller is letting go of the unit for $150Cheers,Ash

author: dom0
author_rank: Super Contributor
timestamp: February 12, 2015, 10:29:08 am
content: As a system supply they're probably loud (fan likely unregulated). Also for 80 W it's a full 19" unit, so it's rather large.Also seehttps://www.eevblog.com/forum/chat/need-opinion-re-hpagilent-6623a-power-supply/

author: ninjastrike
author_rank: Contributor
timestamp: February 12, 2015, 10:58:04 am
content: Thnaks dom!
Opinion on Rigol waveform generator. - Page 1
Forum section: electronics / testgear

author: Docholiday
author_rank: Regular Contributor
timestamp: February 11, 2015, 05:13:06 pm
content: Can anybody give some opinion on the Rigol DG3061A? Have an oportunity to buy one.Thank you for your replies!Nicholas

author: jpb
author_rank: Super Contributor
timestamp: February 11, 2015, 05:55:59 pm
content: I don't own one, but I did study various options when buying my own generator about 6 months ago or so and can give you some things to look out for.Looking at the specs, the main negative that strikes me is the jitter and the very slow rise time for arbitrary waveforms. The jitter is 300psecs + 100ppm for square waves which is quite large (the Agilent/keysight 33520A that I bought off the Keysight ebay store is less than 40 psecs).The arbitrary waveform specs of the Rigol are pretty bad - 35 nsecs rise time and rms Jitter of 6 nsecs + 30 ppm.The Rigol design dates from 2008 and their more recent designs are much better.For general background reading I recommend this (rather old but still very useful) article :http://www.berkeleynucleonics.com/resources/smartarb/edn_article.pdf

author: Docholiday
author_rank: Regular Contributor
timestamp: February 11, 2015, 06:42:23 pm
content: Thank you so much for your insight and the link too.Nicholas
AMPROBE AM-140-A BACKLIGHT REVISION - Page 1
Forum section: electronics / testgear

author: pearson968
author_rank: Newbie
timestamp: February 11, 2015, 06:54:51 pm
content: I don't know if anyone else has posted information on this, or if it's still relevant. It appears the AM-140-A has a backlight revision vs the old multimeter discussed in YouTube.com videos and previous post descriptions. Attached image below.

author: TimNJ
author_rank: Super Contributor
timestamp: February 11, 2015, 10:49:33 pm
content: Looks better! I like the amber color choice too.

author: PedroDaGr8
author_rank: Super Contributor
timestamp: February 12, 2015, 05:54:33 am
content: Is this one of the ones made by Brymen? I know brymen updated a bunch of models from a greenish backlight to a much nicer amber one at the same time as making the S model revision on the protection components.

author: TimNJ
author_rank: Super Contributor
timestamp: February 12, 2015, 06:00:17 am
content: Quote from: PedroDaGr8 on February 12, 2015, 05:54:33 amYes this is a Brymen design. So that makes sense then!
Keithley 2015 Problems - Page 1
Forum section: electronics / testgear

author: cjk2
author_rank: Contributor
timestamp: February 11, 2015, 01:15:11 am
content: I bought a Keithley 2015 from a seller on Ebay. In testing it a bit, there are two strange things i noticed: its input impedance in 10V mode does not appear to be as high as it should. If I connect the meter to 5V then disconnect it, the reading declines to a few volts in less a minute. My fluke 8840A will stay at nearly 5V for what seems like hours.This meter also emits a faint hiss or whine that is not constant but sounds like it contains noise. VFD driver? I have not looked to see if there are switching power supplies in these units but I would guess that's the source of the noise.Have other Keithley 2015 users noticed these behaviors with their meters? The seller offers a 90 day return policy so it may well be going back...Edit:I've looked at this more and I think there is something seriously wrong with this meter. When left to auto range with nothing connected, the readings change randomly. It counts down from a few milivolts to a little under -1.2V, then starts over again. The AC mode works fine.