hybridfree/eevblog-posts huggingface dataset:
DS-2072A issue - Page 1
Forum section: electronics / testgear

author: jeanguypataterub
author_rank: Contributor
timestamp: January 09, 2020, 11:02:54 pm
content: Any one else get this problem on their scope?When I view a signal and go from 100V range to 50 V range it skips back to the 100V range and the measurements are not accurate at all. If you look at the photos you can see on one the range is set to 100V the other is set to 50V. The waves on the display are identical. The 50V one should be zoomed in. The voltage measurement is way off too. This happens when I switch to other ranges too.I am wondering if it's broken or is there a setting I missed.Thanks for the help.PV

author: egonotto
author_rank: Super Contributor
timestamp: January 10, 2020, 06:30:47 am
content: Hello,try the blue channel (ch2). Is this the same behavior?Set the probe to 1:1 and connect to the Compensation Signal Output Terminal at the right side and try with 5V/div and 10V/div.Look it like my pictures?Best regardsegonotto

author: Gixy
author_rank: Regular Contributor
timestamp: January 10, 2020, 08:11:18 am
content: Hello,+1 with egonotto's suggestion. You can also perform a calibration (system menu).

author: TurboTom
author_rank: Super Contributor
timestamp: January 10, 2020, 08:58:09 am
content: You didn't specify the firmware that's running on your scope. Since it's an "A" version, it couldn't be one of the very early ones, but anyway, if it's not a current one, you may consider an update, followed by an automatic calibration?Current firmware is 03.06.

author: jeanguypataterub
author_rank: Contributor
timestamp: January 10, 2020, 02:15:15 pm
content: Quote from: egonotto on January 10, 2020, 06:30:47 amHi, thanks for the help. i did as you suggested.Yes channel 2 does the same. The firmware I have is 00.03.05.sp4 Hardware version 2.0
Do you have a dso-shell? What about other inexpensive gadgets like signals? - Page 1
Forum section: electronics / testgear

author: Larryc001
author_rank: Regular Contributor
timestamp: January 10, 2020, 12:03:26 am
content: I have been reorganizing my lab lately, and have found a use for my little dso-shell. It is very useful for checking equipment and cables. I also have little pulse generators. These items are very inexpensive. I would like to know what other items are being used, what they are being used for, and how you liked them. Any comments would be most welcome.

author: thm_w
author_rank: Super Contributor
timestamp: January 10, 2020, 01:03:22 am
content: Could you explain how it is useful for checking cables, do you have a normal full-size oscilloscope?https://www.aliexpress.com/item/33027421826.htmlThis USB board is nice for testing USB-C or probing various parts:https://www.aliexpress.com/item/33014406002.htmlThe only thing I can think of its missing is a current shunt resistor. But you can get a dedicated USB power analyzer too.The cheap $10 logic analzyers are incredibly useful:https://www.aliexpress.com/item/4000257258147.htmlStlink/bluepill boards.

author: Larryc001
author_rank: Regular Contributor
timestamp: January 10, 2020, 01:22:32 am
content: Yes I have full-sized oscilloscopes. Really full sized.https://photos.app.goo.gl/rv7WNBPM61PsdLpj7In rewiring my lab it is useful to have a tester to carry around to check that I am getting output routed to various instruments. Also very useful where a scope is required that can be fully isolated from ground. But I confess I don’t do anything that is sophisticated or even from this century. Just fun.
Rigol v Siglant for 200Mhz 2 channel scope? - Page 1
Forum section: electronics / testgear

author: Davy
author_rank: Regular Contributor
timestamp: January 09, 2020, 01:43:14 pm
content: I'm looking at Rigol DS2202 200Mhz 2 channel scope, not sure whether it be version A or E. I did see Dave's review.I'm wondering how they compare to the Siglant which seem more modern and appear able to do that bit more, it's basically for general purpose use and to replace the cumbersome HP1744A 'back breaker'.... and lots more bench space.I don't know why but I do seem prefer Rigol over Siglant knowing the Siglant has little more math functions, any thoughts, advice would be welcome here. Thanks.Dave

author: tautech
author_rank: Super Contributor
timestamp: January 09, 2020, 07:04:42 pm
content: Feature set should guide you here, look at SDS1202X-E or the bit later SDS2202X-E that has a few more fruits.
121GW Odd Failure Mode - Page 1
Forum section: electronics / testgear

author: the_deutsch
author_rank: Newbie
timestamp: January 08, 2020, 09:15:49 pm
content: Hi All!I just received my 121GW a couple days ago and I noticed that after checking a few different functions, the red probe didn't seem to seat down as far as the black probe. Then I noticed that one of the sockets appeared to have the top broken off and I deduced that it was actually stuck up inside the red probe. Anyone else had something like that happen? Just curious more than anything.

author: Gyro
author_rank: Super Contributor
timestamp: January 08, 2020, 09:21:16 pm
content: Welcome to the forum.Seehttps://www.eevblog.com/forum/testgear/eevblog-121gw-multimeter-issues/msg2792850/#msg2792850and associated posts.

author: the_deutsch
author_rank: Newbie
timestamp: January 08, 2020, 09:22:34 pm
content: Thanks Gyro! My poor searching skills bit me on this one. Thanks for pointing me in the right direction.
Hakko FR-301 alternatives? - Page 1
Forum section: electronics / testgear

author: jonpaul
author_rank: Super Contributor
timestamp: January 07, 2020, 12:44:19 pm
content: Hello all, this old EE has used solder wick and various spring loaded solder suckers, all are slow, and damage delicate PCBs. Due to maintaince, cost and bench space I never got a rework station like the Pace.Now am restoring a number of vintage TEK 2465/7B and 7000 plugins, and easily unsoldering components and ICs without board damage is a must.Seems the Hakko FR-301 is highly regarded and gun style, no separate power supply/vacuum. (need USA 120V model)But rather costly $250-350.Open to the Forums feedback on the Hakko, as well as lower cost alternatives.Most work is thru hole not SMD and I might work on 3-10 jobes in a year.MANY THANKSJon

author: Simon
author_rank: Unknown
timestamp: January 07, 2020, 02:45:27 pm
content: Please do not double post.
HMO1202 and PulseView - Page 1
Forum section: electronics / testgear

author: hazzer
author_rank: Regular Contributor
timestamp: November 08, 2019, 03:51:01 pm
content: PulseView now supports the R&S HMO series including the HMO1202Harry

author: abraxa
author_rank: Frequent Contributor
timestamp: January 06, 2020, 10:55:10 am
content: Nice video, thanks for sharing!
DVM High Megohm Range - Page 1
Forum section: electronics / testgear

author: Ron Reeland
author_rank: Newbie
timestamp: January 08, 2020, 08:15:35 pm
content: Hi:I have two digital meters from "Circuit Specialists' that have a 200 Meg-ohm range. Of course they are of Chinese origin but branded "Circuit Specialists".They are very accurate on resistance ranges when tested with various values of precision resistors of 0.1 percent tolerance. Except the highest range of 200 Meg-ohms. Both meters will not "zero" on that range when probes are shorted. One displays 10.19 megs and the other 1.0 megs with shorted probes.However if I test each meter with say a 150 Meg-ohm resistor, the result is very accurate as long as I subtract either the 1.0 meg or the rather unwieldly 10.19 meg figures.Are there any internal adjustments to zero out the 200 Meg range? Or is non-zero oddity a quirk of very high meg-ohm ranges on all meters? Other meters I have seem to have a top range of 40 megs or so. They do zero properly at those lower ranges.Thanks,Ron Reeland

author: retiredcaps
author_rank: Super Contributor
timestamp: January 08, 2020, 08:41:06 pm
content: What is the exact model?Please post clear focused pictures of both pcbs. We/you are looking for any debris, dust, oops moments, etc.
Measuring high voltage - Page 1
Forum section: electronics / testgear

author: MrElectric
author_rank: Contributor
timestamp: January 04, 2020, 05:09:53 pm
content: I use my trusty, 30 year old multimeter for most things I need to measure. However, as I would need something that can measure up to 1200 V or so. What are the options? It would only need to be able to measure voltage.I'm troubleshooting my oscilloscope, which is why I'm interested in measuring high voltages.One idea I had just now is to make a voltage divider. Just connect the multimeter to the divider box, and multiply the measurement by 10. That would be an easy solution. I would just have to buy high quality insulated cables (5000V or so).Is this how everyone else measure high voltages?

author: David Hess
author_rank: Super Contributor
timestamp: January 04, 2020, 06:02:50 pm
content: That is essentially what a high voltage probe for a multimeter has. Inside there is a resistive divider made from at least one high voltage resistor designed to operate into the input resistance of the multimeter.

author: _Wim_
author_rank: Super Contributor
timestamp: January 04, 2020, 07:52:51 pm
content: Some DIY high voltage probes:https://www.pocketmagic.net/homemadediy-high-voltage-probe/http://archive.siliconchip.com.au/cms/A_111937/article.htmlThis should give you an idea how to make one yourself that is safe to use.

author: MrElectric
author_rank: Contributor
timestamp: January 04, 2020, 09:27:14 pm
content: Thanks for the replies!I also found this thread:https://www.eevblog.com/forum/testgear/howto-measure-high-voltages-with-a-multimeter/
DSLogic U2Basic model logic analyzer now has 64Mbit buffer - Page 1
Forum section: electronics / testgear

author: wnorcott
author_rank: Regular Contributor
timestamp: January 06, 2020, 12:08:12 am
content: I bought from Ali Express thishttps://www.aliexpress.com/item/4000395589944.htmlIt appears to be a new model that between a Basic and a Pro. The basic had no sample buffer and the plus had 256 megabits. The new U2Basic has 64 megabits sample buffer.It was a good deal I got it in a package for $57 that included (10) 10K pots with knobs and (2) CY7C60013A USB dev boards. I thought I was ordering just the DSLogic Basic that has no sample buffer; when I got it though it was this. In the DSLogic analyzer software it shows up as DSLogic U2Basic in the tool too.

author: Mrkvak
author_rank: Newbie
timestamp: January 06, 2020, 02:13:32 am
content: Except the U2B does not officially supports samplerates above 100MHz (you get 100MHz@16ch, and nothing else). I tried modifying DSView/libsigrok sourcecode (checkhttps://www.eevblog.com/forum/testgear/upgrading-dslogic-basic-to-plus-without-eeprom-modification/msg2859158/#msg2859158) and it seems to be working, but I'm unable to verify it works as intended.
PM3320A Control and Programming - Page 1
Forum section: electronics / testgear

author: Stonewerk
author_rank: Contributor
timestamp: August 11, 2015, 12:44:58 am
content: Users of the Philips/Fluke PM3320A with IEEE?RS232 Option:I am curious how you are using the IEEE/RS232 option. Are you using it for instrument control, or for data capture, or for both? Are you using the IEEE interface, or RS232 interface? If you're using the IEEE interface, how are you connecting (interface hardware/software)?I think it would be interesting to share experiences and expand resources for this instrument...

author: JohnCompter
author_rank: Newbie
timestamp: December 27, 2019, 10:52:50 am
content: I reached the point that I have control over the PM3320A via the RS232 at a baudrate of 19k2 via the programming language Mathematica.To investigate if a faster transfer of data can be obtained I added an IEEE488 interface of Prologix.This last interface is successfully applied for the PM3384B, PM5193 and PM2535, but it failed for the PM3320A.The cause is unknown; might be a failure in the IEEE-interface of the PM3320A, a wrong interpretation of the required commands or missing information in the description of the IEEE-interface of the PM3320A.

author: JohnCompter
author_rank: Newbie
timestamp: January 02, 2020, 12:21:55 pm
content: I got both interfaces, IEEE and RS232, running for the PM3320A under Mathematica 13.Really impressive to get the pictures on a PC screen, two channels, 2048 time-steps and 10 bits wideAn oscilloscope means bright eyes for an electrical engineer and the PM3320A is high class, even 35 years after production.Contact me for documentation, listing and/or hardware.

author: JohnCompter
author_rank: Newbie
timestamp: January 05, 2020, 06:19:04 pm
content: Example of a 4 channel dump for a PM3384B, IEEE488 interface, 8192 time-samples/channel:
Tek type W plugin - mod to use 6DJ8's - Page 1
Forum section: electronics / testgear

author: saipan59
author_rank: Contributor
timestamp: January 12, 2020, 08:38:29 pm
content: Hi, my first post here.Just acquired a Type W plugin (for 500-series mainframes), paid $3 for it, but it is missing the three 8416 tubes, which are expensive.Has anyone modified a W to use 6DJ8's instead (I have some of those)? The filaments in the W are in series, and driven from a DC rail. I'm thinking that an appropriate series R, plus a shunt R might work (the shunt R is because I assume the filament current in the 6DJ8 is double the current in the 8416, and there are a pair of Nuvistors in the chain also).So, just wondering if anyone has bothered to mod something to replace an 8416 with a 6DJ8, or has another clever solution...I should mention that I don't have a 500-series box to run the W in, so I don't want to "buy" tubes and such, but in case I get the mainframe someday... I also have an H and a P plugin, that were also $3 each at a local junk shop.Thanks,Pete

author: Larryc001
author_rank: Regular Contributor
timestamp: January 12, 2020, 09:00:29 pm
content: Yes vacuum tubes.net wants $18 for them. However with no mainframe, you might as well put it on shelf so you can admire it.

author: madao
author_rank: Frequent Contributor
timestamp: January 12, 2020, 09:38:38 pm
content: Better, you modified it to 12AT7 or similare double triode.It needs high stable filament current/voltage for high gain & stable DC amplifier.I have luck with 8416 tube, i have buyed all 8416 in one shop, 8€/ piece.

author: chris_leyson
author_rank: Super Contributor
timestamp: January 12, 2020, 10:51:14 pm
content: European eqivalent to 8416 or 6DJ8 is the E88CC which is a special quality version of the ECC88.

author: saipan59
author_rank: Contributor
timestamp: January 12, 2020, 11:09:40 pm
content: Yes, 6DJ8=E88CC=ECC88, but those are all 6V tubes, while 8416 is 12V. That's the issue - there is no easy direct sub for the 8416, except maybe a 12DJ8, which I've never seen an example of.Pete

author: Martin.M
author_rank: Frequent Contributor
timestamp: January 13, 2020, 08:17:43 am
content: some of the tubes there are serial heating from the 150mA (75V)take care from that please
logic probe for old 8bit computer repair - Page 1
Forum section: electronics / testgear

author: cypher007
author_rank: Contributor
timestamp: January 02, 2020, 01:48:02 pm
content: seen this one on a youtube and it has a buzzer which is good as you can hear the tone change when testing data lines. it goes upto 20mhz. trouble is I cant find it in the UK. is there a similar one available in the UK?https://www.amazon.co.uk/Elenco-Electronics-LP-560-Logic-Probe/dp/B000Z9HAP4

author: cypher007
author_rank: Contributor
timestamp: January 03, 2020, 02:40:51 pm
content: anyone? just need probably 20mhz response and audio indicator.

author: AVGresponding
author_rank: Super Contributor
timestamp: January 03, 2020, 05:06:26 pm
content: There'sthison the fleabay.There are plenty of logic probes at low prices, but difficult to know whether they're any good.

author: cypher007
author_rank: Contributor
timestamp: January 03, 2020, 07:24:10 pm
content: that's the one. but its in the states. wanted a UK supplier.

author: Chris_Walch
author_rank: Contributor
timestamp: January 04, 2020, 11:56:34 am
content: Recently I bought this logic probe:https://www.reichelt.de/logic-tester-logik-tester-p10536.htmlReichelt does sell to the UK.
Advantest R3132 Calibration Error - Page 1
Forum section: electronics / testgear

author: Zinger Liu
author_rank: Newbie
timestamp: January 03, 2020, 05:41:55 pm
content: Hello experts,I got a Caliration Error  which is "LOG LINEARITY: Calibration failure." when I warmed up my R3132 after 30 mins or more. But if I turned off the machine and powered up it after cooling down, then tried to do "Cal All" just after powered up, every thing was fine. Anyone knows what's the problem?Thanks a lot!
Extech LCR Meter - Page 1
Forum section: electronics / testgear

author: cosmarchy
author_rank: Contributor
timestamp: January 03, 2020, 02:52:26 pm
content: Hello all,Does anyone have an Extech LCR200 LCR meter?Does anyone know whether you can switch off the auto range and manually select the range?All the manual says is that it powers on in the auto mode but not whether you can select this manually. It is a little frustrating at times and was wondering whether there is a way to do this?Thanks

author: Terry01
author_rank: Frequent Contributor
timestamp: January 03, 2020, 04:37:06 pm
content: I don't have 1 but there are a few decent reviews on YouTube that will probably answer any questions you have. Just type EXTECH LCR meter into the search bar and you'll have loads to choose from.
Aneng 8002 died - Page 1
Forum section: electronics / testgear

author: BurningTantalum
author_rank: Frequent Contributor
timestamp: January 02, 2020, 09:21:29 am
content: I bought an Aneng 8002 when they first came out, to use as an '830' meter for continuity etc. and to save wear and tear on my better meters.Last week I switched it on and it displayed '0F5A' with the backlight permanently on. I take this as being hex as the 'A' sometimes flickers to '9'. The previous use was testing voltages of some 18650s and it was fine when switched off.None of the ranges read any applied value, but the orange function button cycles functions from random ranges.The meter has never been connected to anything over 24V DC and never used the current ranges. I cannot find anything obvious inside so guess it will have to go in the trash- a bit annoying as it has never been abused or subjected to transients etc.BT
Is there a DIY way to operate a desoldering gun? - Page 1
Forum section: electronics / testgear

author: jman43195
author_rank: Newbie
timestamp: January 02, 2020, 02:57:58 am
content: So, just was hoping somebody could bring some knowledge to this, but does anybody know if there's a way to operate one of the replacement guns for the ZD-985 desoldering station? Sort of like UniSolder but for desoldering. (If there was a thread on this already, I couldn't find it)
NPN/PNP/FET Curve Tester 2020 - Page 1
Forum section: electronics / testgear

author: dazz1
author_rank: Frequent Contributor
timestamp: January 01, 2020, 05:20:40 am
content: HiI am looking for a modern curve tracer mainly for power FET testing.I have an analog scope.I have looked at a range of options including Thai Kits, Elektor, Locky-Z Intelligent Curve Tracer etc. All of these found have problems or deficiencies.Brand name built testers like Huntron or Tektronix on e-bay are too expensive so a kit would be ideal.Any suggestions?

author: RoGeorge
author_rank: Super Contributor
timestamp: January 01, 2020, 05:26:24 am
content: From W2AEW:

author: dazz1
author_rank: Frequent Contributor
timestamp: January 01, 2020, 06:20:19 am
content: HiI have an Elektor audio sig-gen I built I think in the 90s. Based on your video, I can rig together a simple tracer. That is all I need.Cheers.I would still like to find a budget kit designed NPN/PNP/Fets. The eye-watering prices on e-bay indicate a good demand.

author: Shock
author_rank: Super Contributor
timestamp: January 01, 2020, 08:33:24 am
content: You might want to mention your budget.The cheap curve tracers that plug into the oscilloscope (aka octopus) are good for a quick visual test, identifying unmarked components and comparison against known good components. Then you get into the area the Huntrons cover which is more signature analysis and circuit troubleshooting. The older dynamic curve tracers have broader voltage and current ranges, stepped and adjustable ranges of operation. Generally the more expensive you go the more thoroughly you can characterize a range of devices at and above operational limits.Curve tracers now have combined into semiconductor and component analyzers which have been expanded by software. Not a curve tracer but the budget option is the AVR transistor/component testers. You can either build the official Germany design or buy a cheap one from China, they go for about $10-30 or so.Here is an octopus circuitwith an adjustable voltage range, the next step up from a basic one.

author: fcb
author_rank: Super Contributor
timestamp: January 01, 2020, 09:28:51 pm
content: I'm finishing up a new Curve Tester for release shortly.Will be available in a few versions ranging from 200V, 20A (on a lower voltage setting!) to +/-800V (for tubes), with secondary supply for screen and heater supplies. The model aimed at semiconductor poweramplifier engineers will do 400V (2A) on high range and 40V (20A).Not set prices yet, but it will be competetive with some of the kits if you factor in some labour. USB based and aiming for better than 0.1% accuracy and of-course proper support and warranty.
Siglent SSA3000X EMC Compliance Limits - Page 1
Forum section: electronics / testgear

author: fanman
author_rank: Newbie
timestamp: December 03, 2017, 02:31:47 am
content: Hi guysNewbie here asking about EMC pre-compliance with the Siglent spectrum analyzers. I've been playing around with the analyzer and noticed that the CISPR limits need to be entered manually or via a template. Does anyone out there know where I can obtain a pre-configured file for CISPR limits?thanksFanman

author: tautech
author_rank: Super Contributor
timestamp: December 03, 2017, 06:47:15 am
content: Have a hunt through the 3 pages of FAQ's put together by US Siglent.http://www.siglentamerica.com/prodcut-pxzl.aspx?id=5113&tid=227&T=2&page=1

author: simone.pignatti
author_rank: Frequent Contributor
timestamp: December 03, 2017, 06:57:44 pm
content: Check this out, it works with both Rigol and Siglent spectrum analyzershttps://www.tekbox.net/test-equipment/emcview-pcsoftware-for-emcprecompliance-testing

author: sjb
author_rank: Contributor
timestamp: January 11, 2020, 04:41:54 pm
content: The previous link to theCISPR limits for the SSA3000X Serieshas changed. You can now find it at ...https://siglentna.com/operating-tip/limit-lines-ssa3000x-spectrum-analyzer/and for those usingEasy Spectrum...https://siglentna.com/operating-tip/set-custom-limits-siglent-easyspectrum-software/
Options on a Rigol MSO4024? - Page 1
Forum section: electronics / testgear

author: swperk
author_rank: Regular Contributor
timestamp: January 01, 2020, 01:55:33 am
content: I just purchased a Rigol MSO4024 on a closeout sale and was hoping that the Riglol program could help me unlock options. Unfortunately, I can't seem to find any way to enter the generated license key into the scope.ISTR that Rigol changed their licensing procedure a while ago, and now all licenses need to be generated through their web site and loaded as a .lic file through a USB stick. Am I correct? If that is true, is there any way to unlock these licenses anymore? My scope arrived with what I believe is the latest firmware: 00.02.03.Thanks!

author: swperk
author_rank: Regular Contributor
timestamp: January 01, 2020, 02:22:56 am
content: Nevermind. I hadn't noticed that there was a second page of the Utility menu. All is just fine now!
Decent probes for Hantek DSO5102P after upgrading to 200 MHz - Page 1
Forum section: electronics / testgear

author: D4no0
author_rank: Contributor
timestamp: December 31, 2019, 09:01:22 am
content: Hello,So I plan on buying a Hantek DSO5102P and hacking it to work at 200MHz, since it comes with lower frequency probes and from what I've heard about the quality of the probes, it is better to get new ones.What probes would you recommend me to buy? I live in Europe, however buying from specialized electronics shops comes at a very high delivery cost, so I'd like to buy them from sites like ebay, banggood.The price range is about 70-80$ for 2 probes, however if you think that this is too cheap tell me beforehand, since I have absolutely no idea about pricing of such things.If you have any better alternatives to oscilloscopes in this price range, I will gladly listen.
Curve tracer - make it or bay it  - Page 1
Forum section: electronics / testgear

author: stefan_trekkie
author_rank: Contributor
timestamp: December 30, 2019, 09:51:27 am
content: Hello.. I will be needing a curve tracer for fast troubleshooting. February i am going with new job and will be taking care of big shop's welding machines and some lates and milling machines. I am going on specialization in Austria for a month but after that will be working.So.. What kind..- The hole unit with the scope in it (new or second hand)- Adapter for X-Y scope mode - whole unit- Cheap kit and build and make it- design my own and build it from scratch (or to use proven working schematic)Please - if you suggest something may not be from US, just from EU or Taiwan and the region (they have fastest delivery i have ever seen from that far away - 1 week)I have laid an eye on something like that:https://www.ebay.com/itm/Curve-Tracer-Adapter-IV-Curve-for-Digital-Analog-Oscilloscopes-110V-220V/302158909479?hash=item465a131027:g:6kIAAOSwA3dYRt9nThis is from US, just for examplehttps://www.ebay.com/itm/Huntron-Tracker-1000-Electronic-Component-Tester-Circuit-Analyzer/124011856286?epid=1425119317&hash=item1cdfaec19e:g:31IAAOSwkeZd1bUeAll kind of comments and experiences are welcome.

author: tggzzz
author_rank: Super Contributor
timestamp: December 30, 2019, 09:58:32 am
content: You need to define the voltages, currents, and frequencies of interest.There are many reasons why you should never use personal equipment at a workplace.

author: kripton2035
author_rank: Super Contributor
timestamp: December 30, 2019, 10:56:59 am
content: too expensive for what is inside. better make it yourself, or have a super bargain on a used device like huntron (but don't dream they are really out of price)look at the "ardupus" project, at the bottom of this pagehttps://web.archive.org/web/20180531100518/http://excelworks.info/Arduino.html

author: kripton2035
author_rank: Super Contributor
timestamp: December 30, 2019, 11:00:08 am
content: sorry the direct link to the page is still working, no need for webarchive.https://www.excelworks.info/Arduino.html
Anyone know where I could get a leader LBO-508A oscilloscope screen LBO-508A - Page 1
Forum section: electronics / testgear

author: namrac
author_rank: Newbie
timestamp: December 30, 2019, 09:02:17 pm
content: I gave my husband a LBO-508A oscilloscope ages ago, but the glass is cracked. We have been searching for a replacement.

author: james_s
author_rank: Super Contributor
timestamp: December 30, 2019, 09:15:01 pm
content: When you say the glass is cracked do you mean the graticule over the face of the CRT? Or is the CRT itself cracked? If it's just the lens then you can probably cut something out of acrylic or polycarbonate, or just ignore the crack and use it as-is. If the crack is in the CRT, there's a good chance the same tube was used in a handful of similar scopes from the 1970s.Either way if you want a replacement you are pretty much limited to finding another similar scope as a parts unit, the parts were custom made for that scope 45 years ago so it's not something you can just go out and buy. There may be "badge engineered" scopes of other brands that are identical to this one, I don't really know. Keep in mind this is a very old, rather basic 20MHz analog scope, you could easily spend more on shipping the parts than the whole scope is worth even if you find them for free.
Help identifying a vintage meter (SEC CT-330??) - Page 1
Forum section: electronics / testgear

author: michalism
author_rank: Regular Contributor
timestamp: December 29, 2019, 08:34:08 am
content: Hi all, and warm season greetings!!I acquired an old vintage meter from the flea market. I looked online for info, but I was not able to find anything about the model or the company.I am attaching some pics for reference.I suppose the manufacturer is "SEC" and the model is the CT-330.it has a bakelite case, and it says "JAPAN" at the back.Any help on this?Also as I have never used such a meter, I would love to get some guidance from here related to the use of analog meters. I have seen some sporadic videos on YT, but any focused advice will be much appreciated!Thank you very much in advance!!Wishing a happy new year to all!Michalis

author: tautech
author_rank: Super Contributor
timestamp: December 29, 2019, 09:17:06 am
content: The front panel is very very similar to my circa ~1980 Japanese Kaise SK-160.I got it as a gift from a family friend for my 21st.The rotary dial markings are almost an exact match however the case in mine has 4mm banana jacks exclusively.Mine also uses 2 batteries for the R ranges, a 1.5V cell and a 15V cell for which you can easily stack five 3V lithium cells and a couple of spacers all covered in heat shrink as a substitute as the 15V cells are getting hard to find these days for a reasonable price.Other features of mine, DC current to 12A (dedicated jack), AC current 0-12A (one range), Capacitance (AC source required), Decibels, DC to just 3KV, 30uA and 0.3V ranges (dedicated jack).Good meter, look after it.PS, these are NOT fused and don't have the modern safety devices, GDT's, MOV's etc so wise to restrict use to low energy circuits.

author: michalism
author_rank: Regular Contributor
timestamp: December 29, 2019, 11:17:47 am
content: Thanks!Great tip on the 15V battery hack, as I was wondering what I should do about it.I am aware of the lack of safety features, and I do not plan to use it on high current/ voltage measurements. I am a beginner anyways!

author: tautech
author_rank: Super Contributor
timestamp: December 29, 2019, 09:22:55 pm
content: Now had some time to take a pic and scan the manual of my Kaise SK-160.@ michalism, I'd be very surprised if your SEC CT-330 isn't just a rebrand of a different model Kaise.Normally I'd compress this pic but for this instance the additional detail is warranted.Kaise SK-160SEC CT-330 (from the OP)Scans of the SK-160 manual attached in 300dpi which is the best I have.

author: michalism
author_rank: Regular Contributor
timestamp: December 30, 2019, 06:59:07 am
content: Thank you for taking the time to scan your manuals!! they will be handy.
Marconi 2955 scope problems - Page 1
Forum section: electronics / testgear

author: tech255
author_rank: Contributor
timestamp: December 28, 2019, 09:48:36 pm
content: Need a bit of help with an old Marconi 2955 I've had this machine for years and 99% of it is working fine, I've been using and repairing these machines since the late 80s and I'm familiar with most of the circuitry but this has me stumped,, the scope has developed a fault and the lower 2/3 of the screen is just green with a little bit of signal on top.I used to have a spare unit i could swap boards out of but since acquiring several other machines i didn't need it so repaired it and sold it, I've searched all the forums and have found no info so i just hope someone out there has come across this problem before.Ive got all the manuals and it has version 16 software
Short review of 4 wire Kelvin measurement cables - Page 1
Forum section: electronics / testgear

author: HendriXML
author_rank: Super Contributor
timestamp: December 28, 2019, 01:58:29 pm
content: Bought me these 4 wire measurement cables.https://www.aliexpress.com/item/32841153973.htmlDid some testing with them. The resistance between one pair (2 m) is 0.05Ω, consistent with copper and the 18 awg it says on the cables.The rubber is flexible, but smells a bit.The reason I choose these is because the wire pairs meet from opposite sides. This ensures a true 4 wire measurement. A lot of aliexpress ones have them in in one part of the clamp.The clamps seem solid/rigid and are most likely gold plated, have teeth on them which fit the opposite ones. So thin wires get a good connection as well.The plugs are different than the images show, but they make a good connection, but I can not be certain of their quality. The center post has a plastic ending on them, so its hard to see the metal construction. Behind the plastic cap there're I think 8 spreaders. If it proves to be rubbish in the future, those plugs will be replaced.The center posts might be somewhat like these:https://www.aliexpress.com/item/32954063176.html

author: rodpp
author_rank: Frequent Contributor
timestamp: December 29, 2019, 02:14:11 am
content: Thanks for the review, I was looking for a Kelvin probe and the original branded ones are expensive, and these Chinese I haven't had any reference.Just bought one from your link.

author: HendriXML
author_rank: Super Contributor
timestamp: December 29, 2019, 11:30:12 am
content: Nice! I added Kelvin to the description, so it will pop up in searches on that word as well.Hope you'll enjoy your purchase as well!

author: BravoV
author_rank: Super Contributor
timestamp: December 29, 2019, 03:32:17 pm
content: That type is considered the cheapest one, own few pairs of them for years and the plastic somehow slowly turned into very brittle and easy to crack.If you're willing to DIY, you can choose the ideal cables or the banana jacks that suits your need, then consider these ...It is much better one than yours, also available at AliExpress, just abit higher price, but quality wise is much-much better and imo worth it, there is review here by forum member PedroDaGr8 ->Franky's kelvin clipsOr if you do 4W measurements frequently at big leaded components, this one is also worth consideration, as the gripping jaw is more suitable for strong bite on big pins, and it has very simple mechanism made it very reliable for long run, also bought from Franky, but its also available in AliExpress.

author: HendriXML
author_rank: Super Contributor
timestamp: December 29, 2019, 03:41:56 pm
content: Thanks for your response, for me too late but others might benefit from it.I'll keep them in the dark when not used. That hopefully make them more durable.There's always a way to f*ckup a simple product I guess.I hope they will give some years of service. Maybe i can replace the plastic with a 3d printed substitute when they crumble.
Rigol DS 2000 - Page 1
Forum section: electronics / testgear

author: DB4MM
author_rank: Newbie
timestamp: December 28, 2018, 09:18:05 am
content: Has anybody else noticed these scrambled Help pictures?

author: Fungus
author_rank: Super Contributor
timestamp: December 28, 2018, 12:48:07 pm
content: If you look at them long enough you can see a 3D image.

author: artur0089
author_rank: Contributor
timestamp: September 15, 2019, 07:41:34 am
content: You have a problem.

author: DB4MM
author_rank: Newbie
timestamp: September 15, 2019, 06:52:10 pm
content: What firmware version are you using?I've been to the Ham Radio in Friedrichshafenthis year and people from Batronix and Rigolhave been there. Even their scopes had scrumbledpictures.

author: JDubU
author_rank: Frequent Contributor
timestamp: September 15, 2019, 09:10:00 pm
content: I'm using firmware version 00.03.06.00.00 and help images are not scrambled.You can get it from the Chinese Rigol site:http://cn.rigol.com/Cn/Index/listView/catid/28/p/2.html

author: DB4MM
author_rank: Newbie
timestamp: September 16, 2019, 07:10:39 am
content: Thank you for the information.Seems like they fixed it!

author: Gixy
author_rank: Regular Contributor
timestamp: December 30, 2019, 07:29:33 am
content: Hi all,Has anybody the release notes of firmware 00.03.06 or know what's new with it?Thx
JUNTEK's new DC stabilized power supply can be wirelessly remote controlled - Page 1
Forum section: electronics / testgear

author: JALEN
author_rank: Newbie
timestamp: December 27, 2019, 07:20:33 am
content: I saw another power supply on AliExpress. His design style is not the same as other power supplies. The input voltage is DC 10-75V, the output voltage is 0-60V can be adjusted continuously, and the output current 0-24A can also be adjusted. Continuous adjustment, the black power is controlled by the white remote control. I think the advantage of this is that it can save space on the desktop, and it can completely put the power in a place that does not interfere.

author: H.O
author_rank: Frequent Contributor
timestamp: December 27, 2019, 10:08:45 am
content: There's also a 96V/20A version available, search for DPH9620.

author: Glen
author_rank: Newbie
timestamp: December 28, 2019, 03:55:31 am
content: Can 24A work for a long time, we are mainly used for LED testing.

author: not1xor1
author_rank: Frequent Contributor
timestamp: December 28, 2019, 05:59:11 am
content: Be awareprobably most of posts here are disguised ads by the Chinese seller, with multiple accounts and all from China even when pretending they are from Spain.
Anomalies with Siglent SDS2202X-E - Page 1
Forum section: electronics / testgear

author: Via3
author_rank: Newbie
timestamp: March 12, 2019, 10:44:43 pm
content: I recently purchased an SDS2202X-E oscilloscope.I check that you have several anomalies, which I will describe.1- In the CH2 channel with the vertical scale in 500uV, when executing a command that produces a Beep, this Beep produces a register of 5 / Div Pk-Pk.2. When switching the appliance off with the CH1 menu on, the appliance does not show the menu when the appliance is switched on again.3- When the calibration function is executed after 30 minutes, the vertical offset position is correct on the two channels, but after turning off the appliance for some time + - 30 minutes when the vertical offset is turned back on, it is completely out of adjustment in CH2 in position 500uV has a deviation of positive 2 Div and CH1 has a deviation of 1.5 Div.These deviations exceed the given specifications: Offset Accuracy ± (1% * Offset + 1.5% * 8 * div + 500 uV): ≤1 mv / divSome friend has already encountered these anomalies?

author: tautech
author_rank: Super Contributor
timestamp: March 13, 2019, 12:17:37 am
content: Welcome to the forum.I haven't checked one I have for similar behavior but I will when I power it for checks before dispatch, however I have sent Siglent a link to your post for the engineers to look at.I will add, as yet there have been zero firmware releases for this new 2kX-E product range so I would expect this may have already been documented by Siglents worldwide beta testers so to be addressed in forthcoming firmware.These sorts of issues have previously been addressed for 1kX-E models so my recommendation is to wait for new firmware.QuoteWhen cold or after 30 mins running ?

author: tinhead
author_rank: Super Contributor
timestamp: March 15, 2019, 09:34:43 pm
content: Quote from: Via3 on March 12, 2019, 10:44:43 pmyour mailbox is full, so i can't send you PM

author: tautech
author_rank: Super Contributor
timestamp: March 15, 2019, 10:21:56 pm
content: Quote from: tinhead on March 15, 2019, 09:34:43 pmYes, until Newbies have 5 posts PM's are limited.OP, don't be shy and make some posts to become a full member.

author: Masterval
author_rank: Newbie
timestamp: December 27, 2019, 09:26:42 pm
content: Hello everyone.Has anyone already tried the new FW?Specifically version 1.1.19R2, According to release notes they solved some problems.

author: tautech
author_rank: Super Contributor
timestamp: December 27, 2019, 09:56:33 pm
content: Quote from: Masterval on December 27, 2019, 09:26:42 pmWhy not install new firmware that fixes stuff and improves functionality ?The full list of fixes etc are listed here:https://www.eevblog.com/forum/testgear/siglent-sds2000x-e/msg2684748/#msg2684748Improvements bring these 2GSa/s DSO's into line with other X-E models.
HP/Agilent 66311B Rotary Encoder - Replacement p/n? - Page 1
Forum section: electronics / testgear

author: MatteoX
author_rank: Regular Contributor
timestamp: December 27, 2019, 04:16:24 am
content: I've just got an HP 66311B power supply. I did some cleaning and basic functions seems to working OK except the rotary encoder. I can enter the values on the keyboard (and for most applications that should suffice) but I am thinking of installing bannana jacks on the front. That would be also good time to replace the encoder.I have to buy power connector on the back and that would be good opportunity to order the encoder too.Has anyone changed rotary encoder on an HP/Agilent 66311B Power Supply? What replacement part have you used?

author: mark03
author_rank: Frequent Contributor
timestamp: December 27, 2019, 06:01:29 pm
content: If it's the same as my 66332A, a Bourns PEC16 series. You can choose if you want detents or smooth turn (I think smooth is better). Also, if yours still works but is "wobbly" you may be able to bend the metal clamps back and fix it without replacement.

author: nctnico
author_rank: Super Contributor
timestamp: December 27, 2019, 06:56:21 pm
content: Don't bother with the encoder. Using the keypad to enter settings is much quicker.
Twintex TP4000N Series Power Supply - Page 1
Forum section: electronics / testgear

author: ppsilva
author_rank: Newbie
timestamp: December 27, 2019, 06:51:22 pm
content: HiI'm a newbie here in the forum.I'm thinking of buying a power supply for my lab.I was searching on Ebay and I came across this:https://www.ebay.ie/itm/Netzteil-Labor-Kanale-4-0-50VDC-0-3A-0-50VDC-0-3A-2-2-15VDC-1-st/163383322999?hash=item260a67a977:g:WJkAAOSw1hJb8r8aIt looks like a nice power supply with a reasonable price.The specs are here:https://www.twintex.com.tw/proimages/SZ_Catalog/TWINTEX_CATALOG_2019_TP4000N.pdfCan anyone give me an opinion about it ?Kind regards,Paulo
Suggestion choosing an hobby signal generator (jds6600, fy6800, UTG1005A) - Page 1
Forum section: electronics / testgear

author: kirys
author_rank: Newbie
timestamp: August 30, 2018, 01:50:41 pm
content: Hi allI know that there are many topic with this question but I need an opinion of some products I didn't see a review yet.I need 2 channels but I don't need a large bandwidth and the price should be less that 200€.At the begin I was considering the jds6000 (about 90€ 15mhz model) that looked "safe" (it's easy to add a linear power adapter) and good enough for me.but I saw also these two:the new fy6800 that has some nice features (modulation) and it's grounded (110€ 30mhz model).and the uni-t UTG1005A that it's 165€ on amazon (but it's only 5mhz).The fy6800 is new so there are still not many review around while the uni-t seems unknown even though its not a recent model (but looks of higher quality that the other two devices).What do you think?Thank youK.

author: Candid
author_rank: Regular Contributor
timestamp: August 30, 2018, 02:37:28 pm
content: If the JDS6600 is good enough for your needs then I would get it. It is a good product for an affordable and very fair price.The FY6800 is more ore less like the FY6600, no big enhancement and about the FY6600 you can find a long and informative thread at the EEVBlog forum. The JDS uses an external psu so can very easy get rid of the ghost voltage problem and it is still floating. I don't know the UNI-T UTG1005A.

author: GregDunn
author_rank: Frequent Contributor
timestamp: August 30, 2018, 09:41:40 pm
content: I have a FY6800 (KKMoon branded). It has an internal power supply w/IEC connector and fuse and the "phantom" voltage issue appears to have been fixed; those two details make it an easy choice over the FY6600. There are a few quirks in the user interface but it's an extremely powerful AWG and does far more than I'll probably ever need. I primarily work in audio, and the 6800 has extremely low distortion as well as sweep capabilities with an output which can be used to drive a scope for swept frequency measurements. I also like the much better display vs. the older 2-line LCD models.

author: Mechatrommer
author_rank: Super Contributor
timestamp: December 25, 2019, 11:34:48 am
content: Quote from: kirys on August 30, 2018, 01:50:41 pmi know this is few months back, but if you have to include UTG line, there is a new model few weeks back $130 60MHz... UTG962 or UTG962E...UNI-T UTG932/UTG962 200MSa/s Function Arbitrary Waveform Generator
What to expect from a mantis scope? - Page 1
Forum section: electronics / testgear

author: FrankT
author_rank: Regular Contributor
timestamp: December 28, 2019, 02:22:49 am
content: I bought a used original mantis scope a while back with x4 and x8 lenses. I was wondering what to expect from the view.I find to get a detailed view, I need to position my head in a very specific spot. If I move left/right or up/down by just a centimeter, I lose the image.Is this expected, or could it have been knocked out of alignment during shipping (UK to Australia)?Thanks,Frank

author: EE-digger
author_rank: Frequent Contributor
timestamp: December 28, 2019, 03:14:46 am
content: Our production people always seemed to like them but I prefer a stereo scope with binocular/dual optical paths.You might try bringing your head in closer, wear glasses with a slight magnification if necessary. This may help to bring you "inside" the field of view.

author: Psi
author_rank: Super Contributor
timestamp: December 28, 2019, 07:55:55 am
content: The advantages of a mantis scope are mainly ergonomics and health.- You can sit up straight, not hunched over a normal microscope all day.- Less eye strain than a normal microscope.But you trade some other things to get those advantages.- It's harder to find and stay in the sweet spot.- Some people say the image, while good, is not as good as a high quality microscope.

author: Pinkus
author_rank: Frequent Contributor
timestamp: December 28, 2019, 11:49:12 am
content: First: yes you definately will have to adjust it after transportation. But this is a quick and easy task. You will find theOperating Instructions And Service Manual(25 pages) of the Mantis on the net, if not I can send you a PDF if you like.I am using both, a stereo microscope and a Mantis, though 99,9% of the time the Mantis is preferred.If you only need to work for a few minutes on a chip, a stereo microscope is fine but after 15 minutes you will feel the difference in your neck ...Yes you need to keep your head at the sweet spot as the Mantis is still a pure optical system like the microscope. It is not a monitor, you still have a real 3D view which makes working / inspection much easier than a 2D view on a monitor.What I would strongly propose is the 6x SLWD lens (there is one on Ebay right now) as it allows a much higher working distance and thus it brings the head up approx. another 10cm (makes working easier). Also a height-adjustable desk would be perfect (which I do not have by now).The latter two tips are also helpful for a regular stereo microscope - here a x0.35 lens will allow you a large working distance and less neck problems as the oculars are then located much higher.