hybridfree/eevblog-posts huggingface dataset:
Any ANENG AN870 Owners Out There? - Page 1
Forum section: electronics / testgear

author: German_EE
author_rank: Super Contributor
timestamp: November 16, 2019, 11:31:59 am
content: Just bought a pair of these through EBay and they arrived this morning and I have no idea which way around the two 1.5 V AA cells fit as there are no markings on the case or the terminals. Whilst I head out for some Duracells please could someone help out?

author: Specmaster
author_rank: Super Contributor
timestamp: November 16, 2019, 12:15:51 pm
content: Watch this video and there is shot of the batteries fitted so you can see how they are inserted, the bit of interest is at 15:20.
Signal Generator - 16Kpts vs 16Mpts - Page 1
Forum section: electronics / testgear

author: sijmen
author_rank: Contributor
timestamp: November 15, 2019, 04:13:27 am
content: Hi,I'm looking to buy my first Signal Generator, and looking at the Rigol DG-1062Z and the Rigol DG-4062.Ignoring all other features, the DG-1062Z has a waveform memory of 8Mpts standard and can be upgraded to 16Mpts, while the DG-4062 only has 16Kpts.In real terms what does that mean to the typical user?How many points are required for most signals?Direction to any information to help me understand how the memory is used would be very helpful.Regards,Sijmen.

author: WhichEnt2
author_rank: Regular Contributor
timestamp: November 15, 2019, 10:02:21 am
content: That memory is used for arbitrary waveforms which can be maked on editor or a device itself.

author: TurboTom
author_rank: Super Contributor
timestamp: November 15, 2019, 10:45:45 am
content: I've got a DG4102 and several other AWGs with much bigger memory, and I've got to say that available waveform memory was never a constraint to me on any of those. I've got to admit that I rarely use arbitrary waveforms of my own. Those big memories should in theory permit to store complete audio samples or even short video sequences (ancient composite PAL / SECAM / NTSC format if anybody still uses or needs them). That is, one will find a software tool to somehow convert them into the native file format to upload into the generator.TBH, I think the DG4000 series is a rather dated design and I would only consider it if it available at a real steal... And if I really need the connectivity and arbitration methods it offers, with separate SYNC outputs and TRIGGER / MODULATION inputs for each channel (other instruments -- Siglent -- just offer a single BNC for all these functions for BOTH channels, so you've got to choose and often certain setups just won't be possible) and a really decent frequency counter function. On the other hand, the DG4000 series doesn't feature "seamless" parameter change in some waveforms, which means the output (Pulse mode for example) will hickup for a few milliseconds if you change the pulse duration and likewise for other waveforms.Before you buy an instrument, please look at the manuals and consider what features are most important for you. I'ld put waveform memory close to the last place of features affecting my choice. That's basically how I ended up with a total of three (four if I count the now half-way defunct "el cheapo" Hantek HDG2000) AWGs. And still I didn't find the "one for all jobs" instrument...Cheers,Thomas

author: _Wim_
author_rank: Super Contributor
timestamp: November 15, 2019, 07:56:21 pm
content: Quote from: sijmen on November 15, 2019, 04:13:27 amThe DG-1022Z can be made to think he is a DG-1062Z. (https://www.eevblog.com/forum/testgear/need-help-hacking-dp832-for-multicolour-option/200/)Just saying...
Software for analyzing exported CSV waveform data - Page 1
Forum section: electronics / testgear

author: Muessigb
author_rank: Contributor
timestamp: November 15, 2019, 12:58:07 am
content: Hello EEVblog community,I am looking for software to graphically analyze .csv files exported from my various scopes.Is there something free or in the < 70€ range that will allow me to drag cursors, zoom in and make the usual measurements?Usually, I'd just use the scope for that, but in this case, I had a rare event occur and I only saved the CSV waveform data, but I would like to do some more, basic, analysis on it.I would be fine converting the device specific csv to any simple format required (or to clean up the CSV file and remove any device specific fields from it).In this case, I had been using the Siglent SHS806.And no, Microsoft Excel or other, similar programs, are not cutting it here for me.I look forward to hear your recommendationsCheers,Benedikt

author: keitheevblog
author_rank: Regular Contributor
timestamp: November 15, 2019, 02:16:32 am
content: Have you looked at Sigrok or pulseview?https://sigrok.org/https://sigrok.org/wiki/PulseViewIt's free and generally works although I've never had a real use for them. I forget which is which, but just investigate that site.

author: Muessigb
author_rank: Contributor
timestamp: November 15, 2019, 03:05:13 am
content: Thanks, keitheevblog for your suggestions!I have just downloaded it and given it a try, but I can't seem to be able to load CSV data representing analog values, only digital ones.Is there perhaps an option I am missing?Cheers,Benedikt

author: rjp
author_rank: Regular Contributor
timestamp: November 15, 2019, 03:20:25 am
content: Their is a problem in this area in that once the simple graphs and filters of an Excel type product arent good enough, then most of the software pushes you to writing little scripts and complex formula filters in some mini language to get the extra levels of analysis.At that point, its usually best to fire up python or whatever and do you own data munging.IRC, sigrok will require python scripts to make it do things beyond its builtin features.

author: SilverSolder
author_rank: Super Contributor
timestamp: November 15, 2019, 03:47:49 am
content: I stumbled over something a while back that looks like it might work for this kind of stuff, but haven't had time to test yet:http://www.datplot.com

author: keitheevblog
author_rank: Regular Contributor
timestamp: November 15, 2019, 03:19:11 pm
content: My fault, I think it only supports logic data imports:QuoteI think this is pretty odd because the software allows you to control and view analog waveforms from something like (25) different o'scopes.It *does* look like they are adding itQuoteThe above is fromhttps://sigrok.org/wiki/File_format:CSVSorry for the wild goose chase -- I'm surprised that's not supported. Surely if you can get the data and display it from so many 'scopes, surely you can load the data from CSV! But I guess not!Keith
Napui power meters... or affordable alternatives ? - Page 1
Forum section: electronics / testgear

author: odium
author_rank: Contributor
timestamp: November 12, 2019, 01:16:16 am
content: Hello people,anyone knows anything about his Napui power meters brand ?manufacturer web (chinese) :http://www.napui.com/some models sold on aliexpress :https://www.aliexpress.com/item/32569299904.htmlhttps://www.aliexpress.com/item/32668647961.htmlgot info ?cheers

author: odium
author_rank: Contributor
timestamp: November 15, 2019, 01:31:19 am
content: seems the brand too new or too shitty …please advise an affordable desktop ac/dc power meter up to 40 amps.thx !

author: threephase
author_rank: Regular Contributor
timestamp: November 15, 2019, 08:26:25 am
content: What does affordable mean to you?There is this instrument from PCE, but you will need the adapter to go over 10A.https://www.pce-instruments.com/english/measuring-instruments/test-meters/power-quality-analyser-power-analyzer-pce-instruments-power-quality-analyzer-pce-pa6000-det_2208271.htm?_list=kat&_listpos=16They also sell hand-held clamp meters that are half the price, but not desktop style.If you want to put something in your own case, you can by a power meter and then the appropriate current transformer.https://www.pce-instruments.com/english/measuring-instruments/test-meters/1-phase-power-meter-pce-instruments-one-phase-power-meter-pce-nd20-det_5930065.htm?_list=kat&_listpos=7Alternatively, you could utilise a power transducer and link it to a laptop / computer for the display. Again, this would be more of a self build.https://www.pce-instruments.com/english/measuring-instruments/test-meters/1-phase-power-meter-pce-instruments-single-phase-1-phase-power-converter-pce-p41-det_5844987.htm?_list=kat&_listpos=12Kind regards
Setting amplifier gains with o. Scope - Page 1
Forum section: electronics / testgear

author: live2fish88
author_rank: Regular Contributor
timestamp: November 16, 2019, 02:40:18 pm
content: Hey guys. Just purchased my first o. Scope, an open VDS3102. I want to set my amplifier gains with a 40hz test tone. I need to measure the clipping point first of the head unit. How do I hook up the scope to the rcas to get a signal? Just as I would with a meter in a 12v cigg Jack? One on outside shroud, one on center pin? Next I need to measure at the speaker inputs. It's a monoblock class d 1400 watt 1 ohm stable amp. Anything else I should check or know?Can a mod move this to the beginner section please?
DSLogic Basic logic analyzer,  upgrade memory chip now unavailable? - Page 1
Forum section: electronics / testgear

author: wnorcott
author_rank: Regular Contributor
timestamp: November 14, 2019, 01:43:07 am
content: Hello, friends.I ordered on the aliexpress 11.11 sale, a shopping cart for $59 including shipping I managed to snag all of this from the seller, I think is a good deal.A DSLogic Basic logic analyzer, the 256K buffer one(2) EZ-USB FX2LP development boards(10) 10K linear pots complete with knobs(!)The 10 potentiometers was just a filler item so I could qualify for an additional $12 off coupon but hey, everyone can use more 10K pots.I was looking through earlier posts on how to convert it to 256M sample buffer. The post was pretty recent. But now I looked at the part number for the DRAM and it is marked obsolete, out of stock now!https://www.mouser.com/ProductDetail/913-4816M16A2TG6AITBut am I fooked now because of lack of being able to get the memory chip? Are there alternatives parts anyone knows a source of? I know, I should have clicked on the Mouser link before the sale not after.How bad is the DSLogic Basic without the chip upgrade, anybody using one? Somebody must be using the Basic model.Thanks in advance.

author: ebclr
author_rank: Super Contributor
timestamp: November 14, 2019, 09:06:49 am
content: Still available in Asian sourceshttps://www.aliexpress.com/wholesale?catId=0&initiative_id=SB_20191114010535&SearchText=MT48LC16M16A2TG-6Ahttps://s.taobao.com/search?q=YM2151&type=p&tmhkh5=&spm=a21wu.241046-global.a2227oh.d100&from=sea_1_searchbutton&catId=100

author: wnorcott
author_rank: Regular Contributor
timestamp: November 14, 2019, 09:36:02 pm
content: Thanks I really appreciate that, ebclr.

author: Microcheap
author_rank: Frequent Contributor
timestamp: November 15, 2019, 12:37:48 am
content: I bought the memory chip on Aliexpress as well some time ago. There is a thread with the discussion of the modification:https://www.eevblog.com/forum/testgear/upgrading-dslogic-basic-to-plus-without-eeprom-modification/msg2270733/#msg2270733

author: techman-001
author_rank: Frequent Contributor
timestamp: November 15, 2019, 12:39:48 am
content: Quote from: wnorcott on November 14, 2019, 01:43:07 amI bought one years ago, it's been very handy and still works nicely, I have no complaints, or plans to upgrade it.My even older Openbench Logic Sniffer still works as well, but the DSLogic Basic is heaps faster with many more useful triggering options etc.
eBay: Market Resaerch Bait Listings - Page 1
Forum section: electronics / testgear

author: jjoonathan
author_rank: Frequent Contributor
timestamp: November 14, 2019, 07:48:56 pm
content: We're all familiar with bait listings: someone wants to know if there's demand at a pricepoint, so they make a listing for goods they don't have to see if anyone bites. If so, they just refund the purchase. For the sake of this discussion, I don't mean drop-shipping, where they will subsequently try to source and ship the order, I'm referring to listings that receive an almost immediate refund and were therefore probably not shopped around.Previously I've associated bait listings mostly with taobao and aliexpress, presumably beacuse their refund policies don't impose much cost on the seller. I can't recall running into even a single one on eBay. I always assumed this was because refunds were seller-expensive on ebay. In any case, I've run into three bait listings this month alone from three different sellers on ebay. Did something change recently? Or am I just lucky?The listings were: a $300 CATC USB protocol analyzer, a $500 HP part, and a $1000 calibration kit

author: thm_w
author_rank: Super Contributor
timestamp: November 15, 2019, 12:12:23 am
content: https://www.ebay.com/help/selling/listings/creating-managing-listings/cancelling-listing?id=4146#feesWhich specific CATC? I see some on ebay listed around $300. Did you see them relist the item at a higher price or not?
Cheap DSO-Shell  (DSO 150) - Page 1
Forum section: electronics / testgear

author: jdev99
author_rank: Regular Contributor
timestamp: November 23, 2019, 10:10:44 am
content: I was looking at these little "toy" oscilloscopes for a while now, and decided to get one. They are going for only £12.34 at the moment. 😃https://www.banggood.com/Orignal-JYE-Tech-DS0150-15001K-DSO-SHELL-DIY-Digital-Oscilloscope-Kit-With-Housing-p-1093865.html?rmmds=search&cur_warehouse=CN

author: Gyro
author_rank: Super Contributor
timestamp: November 23, 2019, 07:13:06 pm
content: They become a whole lot more useful and practical once you mod them to run off an internal Lipo.https://jyetech.com/forum/viewtopic.php?f=19&t=1153&sid=33a80b42968948a9dd16703cfc912e4c
Hantek6254EU does it worth it to buy? - Page 1
Forum section: electronics / testgear

author: sv3ora
author_rank: Regular Contributor
timestamp: November 14, 2019, 08:46:27 pm
content: Hi, I consider buying for a friend the Hantek 6254EU oscilloscope.http://www.hantek.com/en/ProductDetail_12169.htmlHe owns an HP54520A but it's PSU has broken down. He used it for HF work (30MHz max) and he mainly used the FFT function (spectrum analysis) to measure harmonics of HF fundamentals.So he needs to do the same thing with this new one.His old scope FFT did not have enough resolution above 3-4MHz, to distinguish signals 1KHz apart (eg a DSB signal or Two tone IMD measurements)Now, my question is, will he be able to use the FFT of this USB scope to do that thing on HF (1-30MHZ)?
Service Manual needed for a HAMEG HM303-6 35MHz Oscilloscope - Page 1
Forum section: electronics / testgear

author: graybeard
author_rank: Frequent Contributor
timestamp: November 16, 2019, 10:10:45 pm
content: I picked up this HAMEG HM303-6 35MHz cathode ray oscilloscope a few weeks ago a local auction with built-in component tester.It mostly is working but it has some issues I would like to fix. The chief issue is that the intensity control must be turn up all the way yo get any trace, and that trace is not very bright. My dilemma is I am unable to find a service manual or schematics for this model. I can find schematics and service manuals for the HM303-6 and HM303-5, but those models are built mostly with through hole components. This seems to be the last model of the line and is mostly surface mount components.I would greatly appreciate if you can hook me up with a service manual an/or schematics for this HM303-6.Thank You,Chris
HP 895A Manual (or just info) Wanted - Page 1
Forum section: electronics / testgear

author: HalFoster
author_rank: Frequent Contributor
timestamp: November 14, 2019, 08:29:59 pm
content: All-I have four of these units and am not able to find a manual for them; I purchased one on the bay a couple of weeks back, but so far it is a no-show and no response to communications with the seller. I saw in a couple of threads from a year or so back that there were copies floating around and was hoping someone might have something available. These units have been made (originally by Harrison) and sold by HP from 1963 through 1984 but there is a severe shortage of any information about them - strange... The units that I have were some of the last made - date codes from 1982 through 1984 - and yet most of the semiconductors are still germanium - strange again, or at least unexpected.Thank you in advance for any help!Hal
VBA/VB Waveform Data from a Siglent SDS1xxxX-E Series Scope - Page 1
Forum section: electronics / testgear

author: daveyk
author_rank: Frequent Contributor
timestamp: November 13, 2019, 09:34:22 pm
content: I don't know what forum to put this in, here or under programming.Does anyone have a VB routine for pulling all the amplitude and time data from what is shown on the screen of the of a Siglent scope?I do not want a screen shot, just the amplitude and time data for a given channel. Of course, I would have to ask the scope the vertical and horizontal ranges.I would be able to analyze the data for what I need or ever re-create the waveform in a microsoft chart. I would probably be using VBA (I have done a lot of very extensive and complex test software in VBA under Microsoft Access, believe it or not. I also have utilities in VB6 (yes, I still use it) that talk, and listen, to my equipment via GPIB and Network Connections. I just found the programming example from Siglent on how to do it uninterpretable (to me) as I only do VB. I think the example in the manual I have is in Python.Right now with the Scope, I do use VBA/VB to set it up and get signal amplitude data from it and all the other commands. I just haven't been able to figure out how to load up a dimensional variable with the channel signal data.

author: tautech
author_rank: Super Contributor
timestamp: November 14, 2019, 01:29:06 am
content: HendriXML has some interesting threads on data acquisition from Siglent gear, hunt them out.
Micsig firmware issue - Page 1
Forum section: electronics / testgear

author: m_emelchenkov
author_rank: Newbie
timestamp: November 13, 2019, 04:18:07 am
content: Hi. Micsig TO1104 has a firmware issue: it cannot connect to Wi-Fi which password contains spaces. I informed the company's staff around 1.5-2 years ago, asked several times when they plan to solve it. Today checked the firmware again—no updates. The last time I asked them they recommended me to change Wi-Fi password to anything without spaces (haha). So, if anyone of you know engineers from Micsig, please remind them about this bug.

author: beanflying
author_rank: Super Contributor
timestamp: November 13, 2019, 09:05:22 am
content: Quote from: m_emelchenkov on November 13, 2019, 04:18:07 amThere is another recent thread about there website having being flakey recently. The main thread that is currently in use is herehttps://www.eevblog.com/forum/testgear/micsig-tablet-oscilloscope-tbook-mini-to1000/

author: Ranayna
author_rank: Super Contributor
timestamp: November 13, 2019, 09:36:29 am
content: Speaking as a corporate WiFi admin: Do not uses spaces in your SSIDs. Also avoid most special characters besides "-" and "_".The bigger issue my opinion is though that the same limitation often also applies to the passwords.There is soooo much crap floating around with bad WiFi implentations.EDIT: Not to get me wrong. Micsig should still fix that issue.

author: m_emelchenkov
author_rank: Newbie
timestamp: November 13, 2019, 10:12:11 pm
content: Quote from: beanflying on November 13, 2019, 09:05:22 amYes, thank you, I was aware about these issues. Yesterday their site was already working, and I checked the firmware update from the oscilloscope's menu successful, just no new version was found. It seems, I use the last version (anyway, few days ago I asked Micsig support to send me the latest version of the firmware and did not get any reply).Quote from: Ranayna on November 13, 2019, 09:36:29 amYes, I understand your pain. I am sys. admin myself. Fortunately, I don't need to deal with this because I use Micsig at home, I just don't want to reconfigure dozens of Wi-Fi devices around me. Also, I like passwords with spaces (and, personally, never had any problems with them), Micsig is the first "broken" device which don't allow me to enter correct password.I’m probably outraged that they have not been fixing a small piece of code for so long, so I decided to bring it to the public

author: nctnico
author_rank: Super Contributor
timestamp: November 13, 2019, 10:18:39 pm
content: Using a space inside a password will probably break a lot of stuff. For example try to convery such a password as a command line parameter.

author: TK
author_rank: Super Contributor
timestamp: November 13, 2019, 11:59:34 pm
content: Quote from: nctnico on November 13, 2019, 10:18:39 pmmost command line interpreters allow the use of double quotes to use spaces
Norma D4135A manuals, info.. - Page 1
Forum section: electronics / testgear

author: Ypsi
author_rank: Contributor
timestamp: November 03, 2019, 11:03:12 pm
content: Hallo friends!I'm looking for any information about this V-A-W multifunctionmeter, witch i have a long time, but, it's a little bit inaccurate. Unfortunelly, no info can i found on internet, except a pair pictures of them.I will be lucky for any manual, service brochure, commercial info, anything...Thanks a lot!

author: Ypsi
author_rank: Contributor
timestamp: November 13, 2019, 02:53:50 pm
content: No one knows?

author: shakalnokturn
author_rank: Super Contributor
timestamp: November 13, 2019, 06:38:11 pm
content: Neomys Sapiens if anyone, even then I doubt it.You could always reverse engineer it then share your findings here...
Brake fluid pen tester, how they work? - Page 1
Forum section: electronics / testgear

author: rvalente
author_rank: Frequent Contributor
timestamp: November 11, 2019, 09:43:43 pm
content: I'm looking to buy one of these brake fluid pen testers, fairly common in auto shops.I'm wondering, how they work? Its a know issue for brake fluid to absorb water (hygroscopic) but how is this measured? Increase in voltage? Decrease in resistance?Is this a conductibility meter?

author: GerryR
author_rank: Frequent Contributor
timestamp: November 11, 2019, 10:27:33 pm
content: https://www.albadiagnostics.com/shopimages/OTB%20001%20-%20Conductivity%20tester%20bulletin.pdf

author: rvalente
author_rank: Frequent Contributor
timestamp: November 12, 2019, 10:07:36 am
content: The simple stuff is just a conductivity meter...Tks!Any chart describing conductibility x water content available?

author: GerryR
author_rank: Frequent Contributor
timestamp: November 12, 2019, 02:23:26 pm
content: I imagine that because each company has their own "design," they develop their own chart based on proprietary experiments / data. You might try contacting the company at that link and see if they can tell you if a chart exists.

author: rvalente
author_rank: Frequent Contributor
timestamp: November 12, 2019, 07:52:05 pm
content: Ahh, wont bother, they wont reply my with any relevant information.Just occurred me to check google patents
Power Supply: LeCroy T3PS43203P vs Instek GPP-4323? - Page 1
Forum section: electronics / testgear

author: Plasmateur
author_rank: Regular Contributor
timestamp: November 12, 2019, 06:55:26 am
content: Here are the links,1.)Lecory2.)InstekSo is the only difference between these is that the Lecroy is a linear power supply, and the Instek is a switching power supply? They look identical.The linear is showing up as $230 more, which I don't mind if it means there's less of a chance of me picking up high frequency noise.Have more recent bench switching power supplies been designed to eliminate HF noise? Perhaps I should just play it safe and go with the more expensive option?

author: 2N3055
author_rank: Super Contributor
timestamp: November 12, 2019, 07:29:49 am
content: Quote from: Plasmateur on November 12, 2019, 06:55:26 amThey are both exactly the same GW Instek PSU. LeCroy is rebadge...

author: Plasmateur
author_rank: Regular Contributor
timestamp: November 12, 2019, 03:08:01 pm
content: Quote from: 2N3055 on November 12, 2019, 07:29:49 amI'm confused, I can't seem to find information about the GW Instek PSU being a linear power supply

author: 2N3055
author_rank: Super Contributor
timestamp: November 12, 2019, 03:29:05 pm
content: Quote from: Plasmateur on November 12, 2019, 03:08:01 pmIt has 350uV noise... it is linear....
Fluke Fuses: do you know Bassman brand? - Page 1
Forum section: electronics / testgear

author: dj831
author_rank: Regular Contributor
timestamp: November 10, 2019, 09:55:02 am
content: One thing is absolutely certain with these fuses: they are 100% conterfeilt fuseshttps://www.ebay.com/itm/Dmm-44-100-R-Fusible-OEM-de-bonne-qualite-pour-Fluke-10-35-ZPLTA/352848743707Perhaps there are some customers who want to put their meter at risk, to try to save few bucksHave a nice day.

author: Tinderbox (UK)
author_rank: Contributor
timestamp: November 10, 2019, 10:46:57 am
content: A couple of video`s discussing possible fake Ebay Bussmann Fuses

author: coromonadalix
author_rank: Super Contributor
timestamp: November 10, 2019, 04:02:00 pm
content: Fakes ... my friend has been had.

author: shakalnokturn
author_rank: Super Contributor
timestamp: November 10, 2019, 11:22:51 pm
content: They must be used for SPL competitions

author: bitwelder
author_rank: Super Contributor
timestamp: November 11, 2019, 09:09:58 am
content: Do you go off with a (bass) bang?Somebody should test them!
Semiconductor PEAK testers - Page 1
Forum section: electronics / testgear

author: rauldm
author_rank: Regular Contributor
timestamp: November 11, 2019, 06:40:34 pm
content: I have two peak semiconductor testers, DCA75a and DCA55, I'm confused how DCA75 it works, I got a pair BJT's from fluorescent light, 1 is damaged, I upload a video where I tested with multimeter and two testers. DCA75 says component damaged is "right", is not detected like BTJ, DCA55 says is wrong. I would get comments about this...

author: Kleinstein
author_rank: Super Contributor
timestamp: November 11, 2019, 07:58:35 pm
content: A damaged part that is not fully fused can behave odd, not like any common part. So depending on the tests used it may interpret is still some other part - likely with rather poor parameters. A broken transistor may still act as a diode or capacitor. Similar some odd parts (like very high gate threshold FETs or large (high trigger current) thyristors) may be identified wrong.

author: tautech
author_rank: Super Contributor
timestamp: November 11, 2019, 08:09:21 pm
content: You might find some help info and links here to Peak Atlas products:https://www.eevblog.com/forum/buysellwanted/special-offer-to-eevblog-forum-members/

author: schmitt trigger
author_rank: Super Contributor
timestamp: November 11, 2019, 08:28:21 pm
content: All of the automatic semiconductor tester have "recipes" to determine the component type.For instance, to determine whether a device is a JFET or BJT or Mosfet, one shorts the base or gate against the the emitter or the source.If the UUT shows a current, the recipe would say that it is a JFET, because a peculiar JFET characteristic is a significant IDSS value.Now imagine that the UUT is indeed a BJT with lots of leakage. Then at the ICES test, the tester sees the current, and determines incorrectly that it is JFET.

author: rauldm
author_rank: Regular Contributor
timestamp: November 12, 2019, 01:10:41 am
content: Ok, but, is probably it happens because DCA75 it has more components variety? DCA55 says: "damaged component"

author: maginnovision
author_rank: Super Contributor
timestamp: November 12, 2019, 02:43:46 am
content: It may also have to do with the auto detect function. The dca55 appears to require specific hookup and the 75 figures it out.
HP 16700A Logic Analyzer backplane problems - Page 1
Forum section: electronics / testgear

author: keitheevblog
author_rank: Regular Contributor
timestamp: November 13, 2019, 05:06:07 pm
content: On my 16700A, I recently started removing my modules, pulling the plastic runners off the bottom to check for corrosion, vacuuming the boards, just general clean up.No visible corrosion anywhere on Serial number 39xx and 40xx boards. So from 1999 or 2000. I've looked at three boards so far. They are clean.Four of the five modules, (1) master-16717As (2) 16715As, and (1) 16752A, previously passed self-tests earlier in the night and work fine. One of them, a stacked-16717A has thrown inter-chip resource bus test errors when paired with the other one. When I reinstalled it by itself as master, the self-test passed. I'm almost certain the problem was an intermittent connection (bad cable?) on the stacking cables between the boards.After reassembling, I'm now seeing a ton of various errors including:* a memory test failure, which the software alerts me upon bootup immediately, on the non-problem previously master-16717A* multiple unrecognized modulesIf I remove and reseat the modules, some of the modules come working again, and start passing self-tests. I've had this problem before, and once I seat/re-seat some modules, then everything seems ok.I was struggling until 3am last night because despite multiple attempts at seating and reseating (which is taxing on the fingers/wrists for what it's worth!!) I can no longer get my configuration back to normal.Have you guys seen similar problems before? I'm convinced it's the backplane or the backplane connectors on the modules. I've physically inspected the connectors and there's nothing very obvious wrong --- no bent pins or anything..... I've watched the alignment on inserting and everything seems to line up fine.While I've got to completely disassemble to see this fully, I'm not completely convinced that every module is 100% completely mating (from a depth perspective) to the backplane. I think most are close, but it's not perfect.What should I do? Try deoxit on the backplane and the connectors?I've thought about shimming out the backplane if the design would allow it in order to get, ummmm, deeper mating.Appreciate the thoughts or advice.ThanksKeithP.S. This was cross-posted on HP Agilent Keysight mailing list, which I know we share members, so please disregard the cross-post if you see it there as well!
Magnetic hanger on a clamp meter.  Bad idea? - Page 1
Forum section: electronics / testgear

author: Marck
author_rank: Regular Contributor
timestamp: November 10, 2019, 08:53:34 am
content: Hello allI have a fluke 374 FC AC / DC clamp meter that I use for field work. It’s replacing a Fluke 174 so I can have the use of the DC tongs. On the 174 I have a magnetic hanger that I use to hang the meter of whatever rack or panel I am working on. You can appreciate how handy this is.What I would like to know is how much of a bad idea would it be to use the magnetic hanger on on the clamp meter? When it’s stored or being used as a clamp meter the magnet would fold down to the bottom 1/3 of the meter but when it’s hung up the magnet will sit where the 2 halves of the clamp meet.Any advise is much appreciatedM

author: dom0
author_rank: Super Contributor
timestamp: November 10, 2019, 06:16:53 pm
content: Magnetization of the core leads to offsets in DC clamp meters using a Hall sensor in the airgap of the core. That's why precision DC current clamps include means to degauss the clamp (externally in old clamps, like the P6042, built into the clamp itself in newer clamps; I don't know if you average multimeter clamp includes this).
Opinions sought on an HP54645D at AUD$450  - Page 1
Forum section: electronics / testgear

author: rashad
author_rank: Newbie
timestamp: November 09, 2019, 12:36:06 pm
content: It appears to be in good condition, it has all the logic probes with it.But...This IS 2019, and that scope is probably equivalent to my age in scope-years.From my perusing of this forum I know there's quite few still chugging along out there. (Like me, sigh)There's much to tempt me about this - but its age and price are a bit daunting.So... may I ask for some opinions from out there?Thanks

author: PaulAm
author_rank: Frequent Contributor
timestamp: November 09, 2019, 10:38:31 pm
content: It's still not a bad scope and having the logic probe is a big plus. Does it have any optional modules? There's an FFT/comm module that plugs into the back that also give some additional storage. I put together a system for around $350 US a couple years ago scrounging pieces separately. At the time, that was about as cheap as you could get.One con is there is no serial decoding available.I'm still happy with mine and have had zero problems with it. I do a lot of small projects where a 16 bit LA is useful and it doesn't clutter up my bench.

author: rashad
author_rank: Newbie
timestamp: November 09, 2019, 11:20:28 pm
content: Thanks PaulAm, a very helpful reply - both from positioning the value point - and the usability.I'm easing back into hobby tinkering after a long while away and itisa changed landscape.Like serial decode would seem to be a real "nice-to-have" now.... but I don't think a show-stopper for me on this one.I don't think it has the FFT module. Again, that may just put me on the well-trodden accessory-quest path, ha ha.Thanks again

author: nctnico
author_rank: Super Contributor
timestamp: November 10, 2019, 12:00:13 am
content: Well, what else can you buy for AUD$450?IMHO the HP54645D is getting rather old. The last time I used one is over 15 years ago and even that one was an older model at that time. These scopes are great but there is also the option to buy a new 4 channel scope for about the same amount of money which has a lot more bells & whistles.

author: DeepLink
author_rank: Regular Contributor
timestamp: November 10, 2019, 01:25:44 pm
content: I had my 54645D for many years now, and it's still as good as newLooking for a replacement - still haven't found itPro'sMegaZoom (the reason I bougth it)Easy to work with16 digital channelsHP qualityGet's the job doneCon'sScreen, size and BW (many traces on screen is not it's favorite)Fan noiseI have the storage comm module (with RS232) which is good for transfering data to excelIt lacks seriel decoding, but I use a ScanaQuad logic analyser for that (which can trigger the scope)
Availability of UNI-T UT210E (EU)  - Page 1
Forum section: electronics / testgear

author: Lomax
author_rank: Frequent Contributor
timestamp: August 08, 2019, 12:35:09 am
content: Trying to find a (reputable) European source for the UNI-T UT210E clamp-meter but coming up short - all I can find are Chinese sellers on eBay and Amazon, and I'd much prefer to get it from a "local" supplier (lest we run out of that option). Any suggestions?

author: Nornand
author_rank: Newbie
timestamp: August 08, 2019, 12:46:52 am
content: https://www.reichelt.de/trms-mini-clamp-meter-100-a-ac-dc-ut-210e-p147759.html?&trstct=pol_7

author: Lomax
author_rank: Frequent Contributor
timestamp: August 08, 2019, 12:54:46 am
content: Quote from: Nornand on August 08, 2019, 12:46:52 amIloveReichelt; one of the most impressive (paper) catalogues I ownYour link was for the 210B, but I found the "E" here:https://www.reichelt.de/stromzange-digital-ac-dc-bis-100-a-ut-210e-p147759.html?&trstct=pos_0Very reasonable @ €48 inc. VAT. Thanks!Edit:I see now that you fixed the link

author: Lomax
author_rank: Frequent Contributor
timestamp: August 08, 2019, 01:48:34 am
content: I also found it at TME, @ £38 + VAT:https://www.tme.eu/gb/details/ut210e/meters-and-ac-dc-clamp-probes/uni-t/

author: MosherIV
author_rank: Super Contributor
timestamp: August 08, 2019, 07:10:48 am
content: Although you have already found EU sources, just to let you know that Amazon.co.uk should ok as a source. The rules for Amazon traders is very strict. Never had problem getting my UT201E. Any problems and Amazon will refund you.Additionally, get one soon - before Brexitthe price is only going to go up!

author: artag
author_rank: Super Contributor
timestamp: November 09, 2019, 11:29:58 am
content: Are these meters usable at the bottom end of the current range, ~20mA ? I want to measure RCCD trip current and can't convince myself to get a Fluke 368.

author: Macbeth
author_rank: Super Contributor
timestamp: November 09, 2019, 01:49:41 pm
content: Although they are usable within the 20mA range (just don't move it once zeroed), the lack of a MIN/MAX and low sample rate will probably put the kibosh in the trip current testing.

author: artag
author_rank: Super Contributor
timestamp: November 09, 2019, 09:47:32 pm
content: Came across this video of Big Clive's quite by accident. Maybe that's the solution.
Uni-T UT804, FI2804MT calibration procedure - Page 1
Forum section: electronics / testgear

author: Lajt
author_rank: Newbie
timestamp: November 09, 2019, 03:14:27 pm
content: Hi to everyone,Some time ago I bought a bench multimeter: Française d'Instrumentation FI2804MTSeems to be re branded Uni-T UT804 inside and out.I bought it as defective. DC voltage was constantly 1500V and all else worked with no issue.I was hoping for it to be some simple malfunction but everything was pointing towards ES51966A.And yes after replacing the ES51966A it works as it should except that it is out of cal in all the ranges by a small amount.I searched all the internet but could not find calibration instructions.Sent e-mails to: Française d'Instrumentation and Uni-T but they never replied.I even tried to cal it as UT71E since inside it is almost same as UT71D and Volcraft VC940 but it didn't work.Does anybody here knows what is the cal procedure for this instrument?Thank you
CMU200 - Page 1
Forum section: electronics / testgear

author: elettronica52
author_rank: Newbie
timestamp: November 07, 2019, 11:34:08 am
content: I have the rxtx module with the tx section broken. a very low signal comes out. does anyone know these components on the tx output?BW5Z and the small one is G4C.

author: markus_jlrb
author_rank: Regular Contributor
timestamp: November 07, 2019, 12:10:37 pm
content: In order to check the propper functionality of the BW5Z (gain) block,I would separate the gain block and powered it externally and injectan external signal at the input.See my attached image.Using an external lab power supply you could limit the current to 50mAand Voltage to 5V at starting point and observ the test signal at output.If the gain block is working propperly you will get a corresponding outputsignal.Good LuckMarkus

author: YU7C
author_rank: Regular Contributor
timestamp: November 07, 2019, 12:14:48 pm
content: UPG2179TB (G4C) is SPDT RF Switch,SBW-5089Z (BW5Z) is Qorvo MMIC Amplifier.SBW-5089Z is limited to 6V and 130mA.Voja

author: elettronica52
author_rank: Newbie
timestamp: November 07, 2019, 09:15:30 pm
content: and if I put 3 wires for the probes can I measure the in / out signal and if voltage is supplied with the board open? there are several transistors in series with the supply voltage and maybe someone doesn't let it pass. however it must be done for each amp starting from the output.

author: YU7C
author_rank: Regular Contributor
timestamp: November 08, 2019, 06:19:49 am
content: You can use active rf probe and check levels on each stage w/o intervention on the board.I'm using Tek. P6202 connected to SA.
guys can't decide Siglent SDL1200-XE or Rigol DL3021A - Page 1
Forum section: electronics / testgear

author: Iwanushka
author_rank: Frequent Contributor
timestamp: November 07, 2019, 10:48:33 pm
content: Hey mates,my friends can't decide between Rigol DL3021A or Siglent SDL1020X-E, guys want LAN/IO, so far we can't find any DIY LAN/IO (LAN is a must, IO at the moment is not written in stone), Rigol wants 89eur for LAN option, thus buying DL3021 w/o is not an options.thus we have a few questions:1. how is Siglent X-E compared to DL3021A in terms of performance, bugs, stability2. can Siglen X-E be upgraded to fully fledged X model3. maybe there is "free upgrade option o to make DL3021 into DL3021A including DIY LAN and I/O boards4. also we can't figure out if LAN and I/O HW is installed in all non A DL3021 and its only software option or non A model is missing hardware, shops don't want to explain it, but they say you must inform them if you need LAN/IO options before buying non A model or they won't be able to upgrade it later on....EDIT: forgot to mention, guys are interested in characterising their custom PSUs, Lion Battery packs, and BMSEDIT2: Rigol DL3021 + LAN and I/O upgrade costs the same as DL3021ABest Regards,Mantas.

author: MarkF
author_rank: Super Contributor
timestamp: November 07, 2019, 11:40:55 pm
content: There was just a thread on Electronic Loads:https://www.eevblog.com/forum/testgear/electronic-dc-load-tester-recommendations/

author: BillB
author_rank: Unknown
timestamp: November 07, 2019, 11:42:52 pm
content: The SDL1020X-E can't be upgraded officially, and so far, there hasn't been any unofficial upgrade that I know of.There are a few threads on the forum that discuss the two loads, and several more that discuss the Rigol load as it has been around for longer.The Siglent load's max current is 30A vs the Rigol 40A. Rigol has faster max slew rate. Rigol has .1mA readback resolution vs 1mA for the 1020X-E.

author: thm_w
author_rank: Super Contributor
timestamp: November 08, 2019, 12:26:47 am
content: Quote from: Iwanushka on November 07, 2019, 10:48:33 pmNo need to DIY when the hardware is already there, A and non-A are the same.You can read the thread:https://www.eevblog.com/forum/testgear/new-rigol-dc-load-d3000-series/

author: Iwanushka
author_rank: Frequent Contributor
timestamp: November 08, 2019, 08:50:01 am
content: Last Q can rigol D3010 be hacked to D3010A?EDIT looks like it can be upgraded

author: hansibull
author_rank: Regular Contributor
timestamp: November 08, 2019, 09:49:48 am
content: The DL3021 can fairly easily be turned into a DL3021A. I've done it!

author: Iwanushka
author_rank: Frequent Contributor
timestamp: November 08, 2019, 06:12:14 pm
content: Thanks a lot, guys ordered DL3021
Does anyone have the manual for a LKB 2297? - Page 1
Forum section: electronics / testgear

author: ferret_guy
author_rank: Newbie
timestamp: April 22, 2019, 03:58:08 pm
content: I recent got a LKB 2297 and when looking around for a manual and couldn't find one. I am also trying to find what connectors they use and some information about the interlock interface.

author: Neomys Sapiens
author_rank: Super Contributor
timestamp: April 23, 2019, 10:51:31 pm
content: Why don't you use THIS:https://www.labexchange.com/manuals/lkb/2297-power-supply-instruction-manual-e

author: Majorstrain
author_rank: Contributor
timestamp: November 08, 2019, 04:45:21 am
content: https://wiki.london.hackspace.org.uk/w/images/7/71/Macrodrive_1_Power_Supply_2301.pdfBut you have probably found it by now.Cheers,Phil

author: helius
author_rank: Super Contributor
timestamp: November 08, 2019, 06:15:44 am
content: The 2301 is significantly different from the 2297, not least in its maximum output voltage, which is only 1KV instead of 5KV. But it will kill you either way.The connectors are called "LKB/Pharmacia/GE/Amersham HV connectors" and are difficult to find outside of the biomedical industry. They must be used only with 5KV insulated cables. There is also a "HV to 2mm" adapter for connecting regular shielded banana plugs, but it is restricted to be used only up to 1KV.You need to be more specific about which interlock you are asking about: these supplies use several interlocks. The HV connectors can be attached to keys that limit the voltage output when used on the Multidrive XL: that supply limits its output voltage to the lesser of the two keys. But the Macrodrive 5 does not have that feature and ignores the keys. The optical interlock on the connectors is closed when the connectors are fully inserted and open otherwise. There is a case interlock that prevents the supply from running with the case open. And there is a rear-panel interface that is used as part of a larger interlock system, so that operation can be limited to hands-off control.
Multimeter usb adapter product idea - Page 1
Forum section: electronics / testgear

author: TmaxElectronics
author_rank: Regular Contributor
timestamp: November 06, 2019, 01:55:47 pm
content: A little while ago I was was playing around with my DMM (Voltcraft VC850) and realized that the IR mode just sends out 2400 baud serial data and built a little board to fit the slot for the adapter cable, with a little USB-serial converter on it. Now a friend told me that it might be a good idea to sell it, as I could sell it cheaper than the original USB adapter cable (~15€ vs 30€)* and, unlike than the cable, it could stay in the slot until needed.Now my question is: would anybody actually want something like this? As a student I would like to not waste a few hundred € on a product that no one would buy. It should be compatible with all of the instruments that the original cable is compatible with, plus i THINK (no guarantee) the UNI-T ones as they use the same molding (i don't know who voltrcraft re brands their meters from) and would cost around 15€ (+ maybe 2€ shipping). I would probably sell via ebay.One thing that would be annoying is that you might have to change the default serial port for the cable as the software can only use COM1-4.Just to be sure: I'm not trying to advertise this and am not part of any company (though I do have a pretend logo and website, a bit weird i know). I just wan't honest opinionsThe pictures show the version that i made a while ago, the plastic part is 3d printed* Note: i just found knockoff UNI T cables on banggood for 10€ and eBay for 16€, so compared to those the only way mine would be better is that it could stay in the meter and not get lost after not using it for a while.Also i am not quite sure in which topic this question fits so sorry if this is the wrong one.

author: thm_w
author_rank: Super Contributor
timestamp: November 06, 2019, 10:55:57 pm
content: Its a good idea. Some meters have implemented this, the AMPX1 for example that was recently famous:https://www.amazon.ca/Professional-High-Accuracy-Multifuction-Calibrator/dp/B01K1GG6XWIs this the UNI-T cable you refer to:https://www.aliexpress.com/item/32434579468.html?If so your version is better as it can be left in the meter as you say.I would build a few, list here/ebay/tindie and see if there is any interest and go from there. For a future board revision you may consider trying a USB C connector.

author: TmaxElectronics
author_rank: Regular Contributor
timestamp: November 07, 2019, 02:08:51 pm
content: Jep that's one of those cables.I have actually considered using usb C in the first place, but at least in my lab all of the usb enabled tools use b/mini b/micro b so i have quite a few of these cables around and only one usb C for my phone.I might make two versions of it though.So once i can scrape together enough money to make >10 I'll put them up on ebay
Rigol DS1102e or Hantek DSO5102p - Page 1
Forum section: electronics / testgear

author: joseps
author_rank: Newbie
timestamp: November 08, 2019, 07:49:02 pm
content: Hello,I am an engineering student and I am in the class of digital systems and microprocessors. In class they make us make various projects based on basic electronics, memory, family 74ls and later work with some PIC.For me it is not possible to go as frequently as I would like to the university to be able to use the material that is in the laboratories( Agilent 54621a ) and I am thinking of setting up a "mini laboratory", at home with a tight budget. So you can advance in the projects more easily.My question arises when choosing a suitable oscilloscope, because I don't have much money to spend. They offer me a Rigol DS1102e for about € 175 ($ 200) and I also have the opportunity to buy the Hantek dso5102p for about € 200 ($ 225).Observing the datasheets I see that they are products with similar characteristics, the only thing that in my opinion differentiates them is the screen where the hantek is better (7 "vs 5.6"), and I understand that the quality in general that I think Rigol should be above . As for memory I think they are also similar.I have been going around for days and I do not finish deciding and that is why I wanted to ask in the forum, where you have much more knowledge than me.Thank you very much in advance!pd I have seen a similar question here but I have not taken anything in particular regarding the two that I quote. (https://www.eevblog.com/forum/testgear/hantek-dso5102-vs-rigol-ds1102-vs-rigol-ds1054/)