hybridfree/eevblog-posts huggingface dataset:
very low powered power source - Page 1
Forum section: electronics / testgear

author: meriororen
author_rank: Contributor
timestamp: April 30, 2017, 04:08:02 am
content: Hi,Recently I've got myself a classic very low powered power source labeled Kikusui DPSV10-005,It's "digital programmable power source", handling +/- 10v, with output capability of 50mA (haven't tested it).I am wondering what application does this thing have. I've got it for 10 bucks, so well.. just curious.I wonder if I could tamper and get higher amp out of this thing.
What a awesome place to put a connector... - Page 1
Forum section: electronics / testgear

author: daqq
author_rank: Super Contributor
timestamp: April 28, 2017, 01:09:06 pm
content: While searching for something else I came up on this item:http://www.ebay.de/itm/Siemens-DC-Power-Supply-B-3080-regelbares-Netzteil-mit-GPIB-/201463935123?hash=item2ee82fb093:g:MhUAAOSw7hRWP8rhNow, I suppose they could have put the GPIB connector below the instrument, that would have been more awful, but this is the second worst option I think. Nothing can be placed upon it properly, no stacking...Unless I'm missing something. Is there any reason for placing the connector in such a way?Thanks,David

author: Twoflower
author_rank: Frequent Contributor
timestamp: April 28, 2017, 01:12:06 pm
content: Not sure, but could it be that the counterpart is on the bottom of the brick? You only need to stack them and they're connected. Just an Idea.

author: TK
author_rank: Super Contributor
timestamp: April 28, 2017, 02:30:20 pm
content: Yes, looks like it is used for stacking units

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: April 28, 2017, 02:48:59 pm
content: Looks like it has locating points on the top to seat something on top.I found this Image, which has the same detail

author: ADT123
author_rank: Regular Contributor
timestamp: April 28, 2017, 07:18:35 pm
content: Mike - where did you find that photo of the B3160 scope. I would love to have more details as I have an interest in older PC scopes (I started my career designing them) and this one is new to me.

author: robert_
author_rank: Regular Contributor
timestamp: April 28, 2017, 07:20:38 pm
content: There was a whole family of stackable instruments from Siemens. These have a GPIB connector on top and bottom side, and there was a base module that brought out the GPIB to the back side. All of those were intended purely for use in ATE, having no local user interface. I did pick up a DMM from that series at some time but have sold it in the mean time.It did make a lot of sense, you will understand when you see how a typical GPIB wired test system of 10+ devices looks like on the back side. Sadly, as so many good ideas, it wasnt widely adopted.Would have been nice if the semi-standard 1/2 19" and 19" format would have adopted a similar solution.It is now getting better with more recent interfaces with thinner cables, but GPIB spaghetti was a very real problem for many years.

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: April 28, 2017, 07:43:00 pm
content: Quote from: ADT123 on April 28, 2017, 07:18:35 pmGoogle image search on the model number of the PSU.

author: james_s
author_rank: Super Contributor
timestamp: April 28, 2017, 11:39:38 pm
content: That's actually pretty clever, assuming there's another one on the back to enable convenient interconnection with instruments not part of that series.

author: daqq
author_rank: Super Contributor
timestamp: April 29, 2017, 06:28:34 am
content: Huh, that didn't occur to me... derp derp derpThanks.
HP 5335 GPIB query / response - Page 1
Forum section: electronics / testgear

author: cncjerry
author_rank: Unknown
timestamp: April 28, 2017, 06:00:17 pm
content: I've read thru a number of entries on the 5335 GPIB but can't get a response from mine. It accepts the commands I send it as evidenced by it resetting with 're' and others but I can't get a reply for nothing.I am using Visual Basic as well as PYVISA, both the same.Any ideas?btw: I've been successful with other gear from the same family like the 3335, 4586, etc.Thanks

author: Dr. Frank
author_rank: Super Contributor
timestamp: April 28, 2017, 06:26:33 pm
content: Hi,the 5335A reacts as normal as other instruments, concerning GPIB commands.I assume, you have initialized the GPIB controller in the beginning?But first check, whether the leftmost DIP switch on the rear of the 5335A, is set to "addressable mode", i.e. pushed down.See manual 5335A-90021, page 3-25.In the other (up) position, Talk Only, it won't react to any commands.If you still have problems, install TIMELAB, from John Miles, KE5FX, and run the 5335A time acquisition, which is tested working.http://www.ke5fx.com/timelab/readme.htmThis is useful, anyhow, for time keeping and Allan Deviation measurements.Frank

author: cncjerry
author_rank: Unknown
timestamp: April 28, 2017, 07:23:03 pm
content: When I first checked the switch was up and I pressed it down prior to trying the commands.I've tried the various initialization commands I've seen without a response.I'll try timelab, thanks.

author: cncjerry
author_rank: Unknown
timestamp: April 28, 2017, 07:57:47 pm
content: I checked Timelab and it can't find my adapter. I've had problems like this with other KE5FX code for some reason. The plot emulator works, phase noise, etc but others don't.I'm sure my commands are getting to the unit. Just nothing coming back. I'll keep futzing with Timelab but for some reason I can never get his code that searches for the GPIB adapter to work. I am using an agilent adapter by the way. 100% Agilent.
Mastech HY3005F-3 vs "Dr.Meter" HY3005F-3 - Page 1
Forum section: electronics / testgear

author: BenYL
author_rank: Newbie
timestamp: April 27, 2017, 02:50:24 am
content: I've been using what I think is a real Mastech HY3005F-3 power supply for a while and like it just fine. We need another 30V/5A power supply and the Dr.Meter one on Amazon for $200 shipping included is a pretty amazing price (considering these things are heavy)and looks identical. Does anyone know if it is just rebranded? Has anyone taken this or a similar knock-off apart to see if it is the same quality? How do I tell if *mine* is real?

author: CustomEngineerer
author_rank: Frequent Contributor
timestamp: April 27, 2017, 04:55:30 am
content: I ordered the Mastech version about 2 years ago right around the time that some suppliers had started subbing the Dr Meter instead of the Mastech. The seller I bought from was one of those suppliers so I did end up receiving the Dr Meter version. Their excuse was the Mastech version suffered from several problems that were supposed to have been fixed in the Dr Meter version. Honestly not sure how much I believe that but I've never had any issues with the Dr Meter version. Since I don't have the Mastech version to compare it to I can't tell you how it does compare. Same with the other brands that also use the same design. Its not a knockoff, just a different companies version of the same design. Tekpower and several other companies also make them.

author: Zucca
author_rank: Unknown
timestamp: April 27, 2017, 06:59:37 am
content: My esperience with Mastech is that you learn how to fix stuff when they don't work anymore. I will not buy a new low quality PS anymore. A good brand used one (HP, Agilent, BK, ecc..) is just a different planet.
Promotional DSOX1102G 100 MHz Oscilloscope - Page 1
Forum section: electronics / testgear

author: blacksheeplogic
author_rank: Frequent Contributor
timestamp: April 26, 2017, 07:26:05 am
content: I just purchased a DSOX3024T and got sent a link for a DSOX1102G 100 MHz Oscilloscope. Can't really tell from the offer and website if the serial decode is included in this and/or what other options. 100MHz advertised as an upgrade but the link clearly states 100MHz.Looking on the Keysight website it's not really clear what options are available and what options the incentive DSOX1102G comes with. If anyone took advantage of this offer or knows more about it I'm interested if serial decode works out of the box or will be an extra cost. Can't really think of much reason to justify spending more as I've got the application bundle with the 3024T and a two channel scope without serial decodes is pretty limited.

author: Keysight DanielBogdanoff
author_rank: Unknown
timestamp: April 26, 2017, 05:41:48 pm
content: Congrats on your new oscilloscopes!The "Score 2 Scopes" promo includes a 100 MHz DSOX1102G without any decode options, but it will have the 100 MHz upgrade and the WaveGen.More details about it on the flyer:http://literature.cdn.keysight.com/litweb/pdf/5992-2152EN.pdfand the webpage here:http://www.keysight.com/main/editorial.jspx?cc=US&lc=eng&ckey=2828119Quote from: blacksheeplogic on April 26, 2017, 07:26:05 amThat really depends on what you're doing with your scope!
Leader 3100D Digital Storage Oscilloscope - Page 1
Forum section: electronics / testgear

author: pcs
author_rank: Newbie
timestamp: April 26, 2017, 12:59:29 pm
content: Hi,i´m, looking for information about aLeader 3100D Digital Storage Oscilloscope.Technical Data, User or Servicemanual would be helpfull.Wan´t to inform myself before buying this used Scope.Thanks and kind regardspcs
Service manual: Marconi/IFR AN920/930 or the AN1820/1830/1840 Spectrum Analyzer - Page 1
Forum section: electronics / testgear

author: volvo_nut_v70
author_rank: Regular Contributor
timestamp: April 24, 2017, 07:03:00 pm
content: Hello;Would anyone have the service manual for the Marconi/IFR AN-920/930 or the AN-1820/1830/1840 Spectrum AnalyzersMany thanks!Ken

author: TheSteve
author_rank: Unknown
timestamp: April 25, 2017, 06:15:32 am
content: I've never seen one around - it is tough enough to find a user manual. Which one do you have and what is the problem?

author: volvo_nut_v70
author_rank: Regular Contributor
timestamp: April 25, 2017, 09:22:11 pm
content: Hi;I have a AN1830, LCD display goes all funky with a narrow band of "normal" screen horiz in the middle. You can see characters changing so I suspect the processor is doing it's thing. After shutting off and immediately turning on the image is upside down, with a couple of pieces missing.I'm leaning towards a bad LCD display, any thoughts/experience?I have a pdf AN1840 op manual if you want it..Thanks!

author: TheSteve
author_rank: Unknown
timestamp: April 25, 2017, 09:46:50 pm
content: I assume it has external video - does that work ok?

author: volvo_nut_v70
author_rank: Regular Contributor
timestamp: April 26, 2017, 06:53:57 pm
content: Ya, works fine on external video when the display goes south......

author: TheSteve
author_rank: Unknown
timestamp: April 27, 2017, 01:20:39 am
content: If the AN1830 is the same as the AN1820 then you can unplug the video card. If you haven't done so I would reseat the video chip in its socket and look for cold solder joints in the process. You might also want to check the power supply that is connected to the back of the LCD unit before really tearing the unit apart.

author: DaJMasta
author_rank: Super Contributor
timestamp: April 27, 2017, 01:49:35 am
content: It does sound LCD or video driver related, reseating the chips/connectors and checking for dry joints is a good starting point for either. Actually, if the normal video output is good, I'd suspect the LCD driver/cable more than anything - because if the characters aren't being messed up there, whatever system is doing the screen compositing is still properly functional.Good luck!
KK Moon Dual Channel sig gen - Page 1
Forum section: electronics / testgear

author: jimb
author_rank: Newbie
timestamp: April 19, 2017, 03:58:12 am
content: Hopefully I'm not stepping on any toes.I just received a KK Moon function generator. Dual channel 25MHz DDS.Installed the Software but... wait there was none. At least no app. Just drivers.I tried the app written by one of the group in the thread "My software to control Chinese DDS Function Generator" and....It worked sort of.When connecting, it paused and then reported ""There was a problem connecting".It does work sort of. Bottom line reports "Not connected to DDS" but the signal tab functions work.Sweep controls work sort of. Seems to sweep one channel but not tother.Arb Waveform seems to loads the file but the DDS reports memory empty.On powerup, it displays as:MHS-5225A R5.04MingHe (c)2015Any one else have this model?I tried configuring a terminal program to 57600/8N1/HW but got no response.Thanks for any help you can provide with this.Certainly has some stability and roll off issues.Seems to give up at about 22Mhz.But... what should I expect for 76$ CDN.Regards,Jim Brooks

author: NYG
author_rank: Contributor
timestamp: April 26, 2017, 04:18:32 pm
content: Looks the same as the newer 12bit MHS-5200A. If you haven't done it yet just do some searches on MHS-5200A.
UEi DM397? I think not. An update on this multimeter. - Page 1
Forum section: electronics / testgear

author: Lightages
author_rank: Unknown
timestamp: May 05, 2013, 11:29:01 pm
content: In this thread you can read about my initial problems with this meter.https://www.eevblog.com/forum/testgear/uei-dm397-rather-surprised-in-a-negative-way-short-notes/You can also watch a very nice and thorough review by jwrelectro here:He got all the points that need to be said about this meter. He luckily received a good one. As you can now see, I did not. I also received my replacement from UEi and it was out of spec.......I contacted UEi again and I agreed to look further into this and decide whether or not to return the meters later. They sent me their calibration program and I was successful in getting the meter back to reading correctly. So I will be keeping both meters, and the nice lead set they sent me. The original DM397 will not calibrate correctly on the capacitance function so it still is blind to the first 50pF it sees.I appreciate their attempt to get me a good replacement right away but I have to conclude in the end that if you are looking for a higher end multimeter then the UEi DM397 is probably not the best bet. You should not need to calibrate a new meter and not many people have the means to do so. You buy a meter with these specs to use as a reference so it better be right when you get it!I will post any updates on this if UEi has any further to say on this.

author: Lightages
author_rank: Unknown
timestamp: May 09, 2013, 05:36:30 am
content: UEi has responded that they are investigating the problems I had with my meter with their factory. They haven't tracked down all the problems yet but they assured me that they are working on it.

author: retiredcaps
author_rank: Super Contributor
timestamp: June 16, 2013, 05:52:55 am
content: Well someone, despite potential problems with this meter, got a pretty good deal IMHO. $56 + $10 s/h for a 50,000 count multimeter.http://www.ebay.com/itm/230995970899

author: P90
author_rank: Frequent Contributor
timestamp: April 28, 2017, 01:09:05 am
content: He keeps saying "Hert" repeatedly in the video. It's "Hertz" - as in Heinrich Hertz. Anyone involved in electronics that doesn't know that, should be dragged out behind the barn and shot... LOL
G8FEK BBGen+ 6GHz noise source - Page 1
Forum section: electronics / testgear

author: nctnico
author_rank: Super Contributor
timestamp: September 07, 2016, 08:35:28 pm
content: I recently bought a BBGen+ 6GHz noise source fromhttp://www.g8fek.com/BBGen+.htmbecause I wanted to try and see how useful it would be.I played a little bit with it and it turns out the output level is quite low. According to the specs -77dBm/MHz at 443MHz. I tested it by averaging the noise floor of my spectrum analyser and then averaging the output from the noise source. At the higher frequencies the difference between the two is less than 5dB so it does not seem very usefull at higher frequencies. Ofcourse when using a narrower RBW both traces drop by the same amount. On my scope (1GHz bandwidth) I measure an output of 3.3mV RMS (around -35dBm) with peak-detect on. All in all I think it needs an extra amplifier (especially for the higher frequencies) before it is really useful.

author: g8fek
author_rank: Newbie
timestamp: April 26, 2017, 09:45:54 am
content: Noticed the spectrum analyser has 10dB of input attenuation selected.Select 0dB input attenuation on your SA and the BBGen+ will demonstrate 10dB more noise above the instrument floor than seen on this plot.If you have a spectrum analyser with internal preamplifier then expect typically a further 20dB more noise above the instrument floor (30dB total increase on this plot).Hope that helps.
Power supply suggestions? - Page 1
Forum section: electronics / testgear

author: t_ryner
author_rank: Regular Contributor
timestamp: April 25, 2017, 01:59:36 am
content: I'm starting to work on more demanding circuits, and multi set channel power supplies saved from DVD players and VCRs aren't cutting it anymore. So, I think a adjustable power supply is in demand. Looking for a supply with adjustable current/ DC voltage and a digital readout, preferably under $200.Any suggestions?Thank You!

author: Wytnucls
author_rank: Super Contributor
timestamp: April 25, 2017, 05:03:15 am
content: So many available from China.Look for a specialist brand, like Manson.Linear is better, but usually more expensive than switch mode.I have 2 Manson SSP-7080 which I'm fairly happy with.Being in the States, you should be looking for Agilent second-hand bench power supplies, in a range that suits your tinkering.Like this one:http://www.ebay.com/itm/HP-Agilent-E3615A-60W-Power-Supply-20V-3A-/232305292045?hash=item361679730d:g:NS8AAOSwB-1YwbC-
Micsig tablet oscilloscope TO1102M video, but it is Russian, who can help me? - Page 1
Forum section: electronics / testgear

author: jacklee
author_rank: Regular Contributor
timestamp: April 13, 2017, 01:39:49 pm
content: I'm really love my Micsig TO1104, it's unbelievable good and easy using! If you have that scope like me, I bet you would agree with me.Recently I saw this russian guy' Micsig TO1102M video, which seems good. However I can't understand what he said, if any russian guy could tell us what he's showing, I think it would be nice of you.

author: Zbig
author_rank: Frequent Contributor
timestamp: April 13, 2017, 02:58:54 pm
content: Why the sensationalist topic? Micsig sopes are well known here and there are several threads mentioning them, complete with videos and in-depth reviews. Care to do a little research and search the forum before posting next time?

author: TheAmmoniacal
author_rank: Unknown
timestamp: April 13, 2017, 03:21:46 pm
content: I hope they add bus decoding soon.

author: 2N3055
author_rank: Super Contributor
timestamp: April 13, 2017, 04:32:32 pm
content: Quote from: Zbig on April 13, 2017, 02:58:54 pmWell he probably thought if Rohde&Schwarz can do it, than MCSIG can too.....

author: Gyro
author_rank: Super Contributor
timestamp: April 14, 2017, 11:48:01 am
content: Quote from: Zbig on April 13, 2017, 02:58:54 pmHe knows, he's posted in some of them!

author: Mechatrommer
author_rank: Super Contributor
timestamp: April 14, 2017, 12:00:42 pm
content: where do i plug rotary knobs? how to vertical V offset out of the screen?

author: Micsig_support
author_rank: Regular Contributor
timestamp: April 21, 2017, 07:59:16 am
content: Quote from: Mechatrommer on April 14, 2017, 12:00:42 pmDear, i found a picture in my hand.question 1, In position 1, you can tap "s" or "ns" or the circle to adjust the time base. and the time base value will be shown on the side.question 2, there is one 50% in the panel, and you can use it.

author: TheAmmoniacal
author_rank: Unknown
timestamp: April 21, 2017, 08:06:24 am
content: What I would like to see in Micsig equipment is proper formatting, spelling and terminology. It just looks bad when you use words like "BandWidth", "Couple", "ProbeMuti" and "ProbeType", and use so little spaces "500Msa/s" and "100ns" etc. Clean it up a little!

author: AndyP
author_rank: Contributor
timestamp: April 23, 2017, 05:49:59 pm
content: Bus decoding is imminent, the sales team were nice enough to let my try the beta, for my TO1104I've only used for i2c so far, and only at ~100kHz, so not pushing the limit, but it did seem to just work and I didn't notice any slowing of the GUI.If anyone is interested I can write short section on configuring it.

author: nctnico
author_rank: Super Contributor
timestamp: April 23, 2017, 06:13:49 pm
content: I got a TO1104 as well and am in the process of doing a detailed write up including protocol decoding.

author: jacklee
author_rank: Regular Contributor
timestamp: April 26, 2017, 09:08:58 am
content: Quote from: nctnico on April 23, 2017, 06:13:49 pmIncluding protocol decoding? As I know TO1104 still don't have decoding function, how you get that?
HP VEE or LabView - Page 1
Forum section: electronics / testgear

author: IconicPCB
author_rank: Super Contributor
timestamp: April 25, 2017, 09:58:14 pm
content: Just acquired an Advantech UB data logger.Wondering wihc way to gowith regards to programing it.... LabView or VEE?Are there any other not-so-steep -learning-curve sofftware envirnments to consider?LabView seems to be horribly expensive.Comments please

author: edpalmer42
author_rank: Super Contributor
timestamp: April 25, 2017, 10:48:50 pm
content: Labview Home Bundle - $50 - deliver by download so you can have it today!http://store.digilentinc.com/labview-home-bundle/(No relation to seller)Ed

author: pigrew
author_rank: Frequent Contributor
timestamp: April 26, 2017, 03:20:31 am
content: I used HP Vee about five years ago in a previous job. I found it horrendous. It often crashed, and it was very difficult to work with it for large projects or create libraries/modules. I'd only suggest it for small projects with a single developer. Version control will be a nightmare.I do not have significant experience with LabView. But, my impression is that it is much more reliable than Vee, and is much more popular. I'd go with it if possible. Last I used it, it is not compatible with high-DPI monitors, so the graphics will be ugly or small.

author: DavidDLC
author_rank: Frequent Contributor
timestamp: April 26, 2017, 03:53:25 am
content: LabView Student version for $20.00 at studica.comBut you need to be a student, or maybe you want to buy it for one of your kids that are on school.David DLC

author: DavidDLC
author_rank: Frequent Contributor
timestamp: April 26, 2017, 03:55:06 am
content: I will use LabView, because it is widely used on the industry. I have heard and seen more job post requiring LabView knowledgeDavid DLC

author: thermistor-guy
author_rank: Frequent Contributor
timestamp: April 26, 2017, 05:28:18 am
content: I'm writing my own s/w to control test equipment, using gawk (GNU awk) scripts running on a laptop with Cygwin (Linux environment). Later, I'll move the s/w to a raspberry pi.gawk is turning out (IMHO) to be brilliant for this application. It's a lot of fun, writing code, and seeing it work. I set up remote VPN access to the test equipment LAN, so from off-site I can start, stop, and monitor experiments as they run, or set them up for overnight operation.If you like Linux, you can do all this yourself, if you want.

author: mtdoc
author_rank: Super Contributor
timestamp: April 26, 2017, 05:39:54 am
content: Yep Labview Home Bundle. $50. Easy to learn for basic data logging with a GUI.
Brymen869s crest bug - Page 1
Forum section: electronics / testgear

author: anishkgt
author_rank: Frequent Contributor
timestamp: April 24, 2017, 09:24:44 pm
content: I read that this bug had been reported earlier. I bought a Brymen869s from tme.eu a month back. The crest mode has a bug as mentioned herehttps://www.eevblog.com/forum/testgear/brymen-bm867-crest-bug/Though the reported was for a different model, the same is still seen on the new 869s as well. I have not written to tme yet but before I do I wanted if anyone else is facing the same bug. I used the crest mode to measure the min and max current during pulse on the Ac line and it read 25A?? and normal mode it would not above 5A.Would anyone how to fix this ? Is there a firmware for it ? Or maybe zero down then reading before taking the measurement.Sent from my iPhone using Tapatalk
OWON XDS LAN CONTROL - Page 1
Forum section: electronics / testgear

author: y33t
author_rank: Contributor
timestamp: April 22, 2017, 09:35:51 am
content: Hello all,I am trying to find out LXVI SCPI commands for Owon XDS3102A. The standart ones such as *IDN? or *RST works but others such as data reading is different with this one and is not listed in the page. Can anybody point me to somewhere on this ?Cheers,

author: radhaz
author_rank: Regular Contributor
timestamp: April 22, 2017, 04:50:04 pm
content: I don't think Owon has posted the SCPI for the XDS series yet. Have you looked at the commands for the SDS?http://owon.fj0596.com/software/Application/SDS_Series_Oscilloscopes_SCPI_Protocol.pdf

author: y33t
author_rank: Contributor
timestamp: April 24, 2017, 07:49:11 pm
content: They do not apply to XDS. I found a workaround but it is hard to decode the returned data. I can get the device properties and 40M data points. Problem is to decode the data. So much functionality if we can figure this out this device can act as a standalone workbench. DMM,Scope,AFG and DAQ.Anybody with necessary skills and time to work on this with me ?
Multi-channel oscilloscope by adding multiplexer - Page 1
Forum section: electronics / testgear

author: Mykeil
author_rank: Contributor
timestamp: April 21, 2017, 07:33:08 pm
content: Hi,I am looking for 1xN multiplexer to expand my oscilloscope channels.The plan is to use Tektronix TDS7154 scope as ADC. It has 20GS/s sampling rate and 32Mpts record memory.The collected data will be transferred to Labview by wifi and cut into channels.It is hard to find multiplexer for this job. It must have:- 1 MOhm input impedance,- be enough fast: >1 us. switching speed,- have usable bandwidth: >100 MHz,- and minimum 30 channels.Maybe someone did something like that and has some experience?I spent lot of time searching and did not found.RF muxes have good bandwidth but their switching speed is in milliseconds, since relays are used for switching.General purpose muxes are fast. The switching speed is about 50us but the bandwidth is 1MHz.I think FETs must be used for switching.Thank you very much for your input.Kind Regards,Mykeil

author: 0xfede
author_rank: Regular Contributor
timestamp: April 21, 2017, 07:59:42 pm
content: Maybe a solution could be found using video crossbar switch IC such as AD8116.Never tried it in such scenario but spec wise it should work (200MHz @ -3db, fast switching, 16 x 16 matrix).The problem is that you need 30+ input front end and the switching should be somewhat synced with the ADC clock.Hope it helps,0xfede

author: Mykeil
author_rank: Contributor
timestamp: April 22, 2017, 03:46:56 pm
content: Yes, it is the only way, I think.Thanks.

author: David Hess
author_rank: Super Contributor
timestamp: April 23, 2017, 07:49:06 pm
content: Nothing you will find is going to work at a high oscilloscope input impedance of 1 megohm and that bandwidth; parasitic capacitance will just be too great for that many connections. Video multiplexers operate at a low 50 or 75 ohm impedance.So you either have to work with low impedance inputs or convert high impedance signals to low impedance with a buffer and then multiplex the signals for the oscilloscope input. 100 to 200 MHz buffers are not too demanding so this may be feasible.

author: Mykeil
author_rank: Contributor
timestamp: April 24, 2017, 07:17:41 pm
content: The trace which connects all multiplexers outputs will be long. Adding impedance buffer on each channel will be necessary, but multiplexer may be not needed since buffers can be switched on/off and can work as a multiplexer also.Parasitic capacitance will be small if I will not add any ground plane. It will be only between traces thickness (C1)http://www.electro-tech-online.com/attachments/capacitive-switch-1-jpg.81868/Besides that many multiplexers outputs connected together will give in sum nice amount of capacitance.Thanks for the input.
Hantek 2 CH DSO1102B - Dead - Battery and Power In Good - Will Not Turn On - Page 1
Forum section: electronics / testgear

author: dmreese1
author_rank: Newbie
timestamp: April 12, 2017, 03:33:34 am
content: Greetings,I have a Hantek 2 CH DSO1102B handheld DSO that will no longer turn on. It is 14 months old, two months out of warranty. Tried Hantek support but they do not reply to emails.It would be a shame to lose this piece of equipment.I am looking for any help or even a repair facility that would take this on.

author: Dino KL0S
author_rank: Contributor
timestamp: April 12, 2017, 04:13:17 pm
content: I bought my DSO8000E from "techrecommends" on eBay and Frank who is in Canada was very responsive and is a North American contact and service coordinator I believe for Hantek. BTW, I also had no luck at all contacting Hantek about the current clamp I got via Amazon, they're simply unresponsive. Frank MAY be able to assist if you contact him.

author: dmreese1
author_rank: Newbie
timestamp: April 24, 2017, 07:25:50 am
content: Thanks! It was a big help. I was able to get a repair OK from Hantex

author: Dino KL0S
author_rank: Contributor
timestamp: April 24, 2017, 03:47:51 pm
content: Glad to hear it!
Siglent 2202X ~VS~ RIGOL 2072A - Page 1
Forum section: electronics / testgear

author: Blisk
author_rank: Regular Contributor
timestamp: April 26, 2017, 07:44:34 am
content: So question is which one to buy.Siglent have now 30% on scope and it is about 1100€ but rigol 2072A is alsou around 1100€ and can be hacked to 300MHz.Any advices what is better?

author: tautech
author_rank: Super Contributor
timestamp: April 26, 2017, 08:16:27 am
content: Quote from: Blisk on April 26, 2017, 07:44:34 amIMO it's a bigger picture, do you need all the additional features 2000Xcanoffer ?MSO ?AWG ?140 Mpts memory ?Or for much less $ and with 2 channels and Decode free: SDS1202X-Ehttp://www.siglenteu.com/prodcut-detailxx.aspx?id=2771&tid=1&T=2

author: Blisk
author_rank: Regular Contributor
timestamp: April 26, 2017, 08:52:28 am
content: Right this moment not, but I will and than I will not buy another oscilloscope.I watched this video and Siglent have really bad firmware was that improved yet?

author: tautech
author_rank: Super Contributor
timestamp: April 26, 2017, 09:11:29 am
content: Quote from: Blisk on April 26, 2017, 08:52:28 amYes, big time improved as that vid is now very old.SDS2000 FW was changed to a Version 2 FW which offered a # of improvements, noticeably a large hunk of memory was free'ed up and made available to the user. Then the 1000X and 2000X series have since been released since and all now share very similar versions for the V2 FW including the just released SDS1202X-E.You can read about how it evolves here but some recent improvements are not mentioned in this thread.https://www.eevblog.com/forum/testgear/siglent-sds2000-new-v2-firmware/

author: rf-loop
author_rank: Super Contributor
timestamp: April 26, 2017, 09:26:50 am
content: Quote from: Blisk on April 26, 2017, 08:52:28 amThis video is soon 3 years old! Video show SDS2000 NOT SDS2000XPerhaps FW is extremely obsolete V1 generation?After then V2 generation. And after then several FW updates for V2 FW's and today SDS2000 is not anymore in European portfolio.This video do not tell any thing right except Siglent name. Also who have made this video have some lack of expoerience.As you can see it is like "out from box" review. No any lab grade measurements. Only twiddling knobs and wondering things.When he compare things with Rigol there is also fact that reviewer have LOT of more experience with his Rigol.It is total waste of time to look this kind of old totally obsolete reviews.Today SDS2000X is very different if compare this old SDS2k and specially if compare to totally obsolete very poor FW version. Performance and efficiency is much better, also construction is better, nearly like from other planet.
Tektronix TDS320 Division Adjustments Not Working - Page 1
Forum section: electronics / testgear

author: darthhideous
author_rank: Newbie
timestamp: April 23, 2017, 06:13:14 am
content: Hi all,I just got a Tektronix TDS320 from my local university and everything seems to work, including the autoset feature, except both the vertical and horizontal division adjustments don't do anything. Has anyone run into this issue or know how to fix it? Both knobs turn freely, they just don't seem to be doing anything. I've done a factory reset of the scope.Any help or suggestions appreciated.Thanks!

author: snoopy
author_rank: Frequent Contributor
timestamp: April 23, 2017, 12:22:47 pm
content: When I bought a TDS784 a few of the controls such as the horizontal shift were very sketchy. After disassembly of the front panel control board I managed to squirt some contact cleaner in a very small gap between the shaft and the rotary control and it managed to seep in and clean the control which fixed the problems on a couple of the controls

author: james_s
author_rank: Super Contributor
timestamp: April 23, 2017, 08:31:25 pm
content: I fixed a similar problem on a TDS340 that turned out to be contamination on the PCB that was shorting one of the buttons, the encoders and buttons are multiplexed so a fault with one can cause others to not work. Check for SMT electrolytic capacitors on the front panel board, I know the TDS400's have them, I don't recall whether the 300 series do or not. Those are known to leak and make a mess. Fortunately these are easy to take apart, just don't lose any of the buttons when you remove the front panel bezel. The knobs pull straight out and will come out with the shaft. The front panel PCB snaps on to the back and I think has a couple screws. This is a good time to give the panel and buttons a good scrub, it will look like new.
Display stored image on Rigol DS2000 - Page 1
Forum section: electronics / testgear

author: BC109C
author_rank: Newbie
timestamp: April 24, 2017, 05:32:18 pm
content: Apologies if this has been asked before.On this link Dave loads a custom image from custom firmwareDon't think this a feature but is it possible to load a storedPNG or JPG image from a USB drive onto a DS2000 seriesoscilloscope ( I have DS2072A)Thanks in advance.
Info about Mastech MS8250A needed - Page 1
Forum section: electronics / testgear

author: argintviu
author_rank: Contributor
timestamp: April 23, 2017, 06:55:28 pm
content: Hi. Does anyone have some info about the chip used by MS8250A from Mastech? I am asking because I found a good deal in a local shop for it, but I'd like to buy it only if it can be modified to output RS232 data. It would be great if anyone could take a picture of the ICs on the board for identification.Thanks in advance.
LCR T4 query - Page 1
Forum section: electronics / testgear

author: Snorbans
author_rank: Newbie
timestamp: April 23, 2017, 12:15:16 pm
content: HelloI'm testing a diode, well it's a package of 2 - STV 3H is the part number, its old. I have 2, one gives the attached with a break between the 1 and the 2, but the correct forward voltage, the other, same voltage but no break. Obviously the meter has no instructions that address this, anyone know what this might mean?
Recommend Amprobe AM-160-A or Extech mm570? - Page 1
Forum section: electronics / testgear

author: plusco
author_rank: Newbie
timestamp: April 15, 2017, 03:57:39 pm
content: I have narrowed my multimeter decision down to two units. Which of the two would you recommend over the other: Amprobe AM-160-A or Extech mm570?Thank you,

author: cs.dk
author_rank: Unknown
timestamp: April 16, 2017, 06:32:24 am
content: As far as i know, both are the same, except for color, price, availability in your country, and maybe warranty. Both are rebranded Brymen BM857 or BM859, which is an older design.One thing i hate with the older Brymens is, that they don't remember last setting. Ie. if you want continuity test, you switch to ohms scale, and press range one time - Every time you power up the meterThe newer ones with the more curvy design, do remember their last setting.Just a quick google-fu shows that the amprobe is around the 250$ mark, which seems ridiculous expensive IMO. If you don't need the counts, or other features i would rather go for aBM235which is cheaper and more compact. Or if you need the counts, accuracy, and other features, get a BM869 which seem to be almost the same price (but a newer design);http://www.tme.eu/en/details/bm869/portable-digital-multimeters/brymen/bm869s/#

author: plusco
author_rank: Newbie
timestamp: April 23, 2017, 04:01:17 am
content: Thank you. I will check out your suggestion.

author: rsjsouza
author_rank: Super Contributor
timestamp: April 23, 2017, 04:15:14 am
content: I have a BM857 and I like it very much, but I would find hard to justify buying it at the price mentioned above.If you can import easily, TME has several models of Brymen meters including the 857 and their top of the line 869 at much more reasonable prices.
Amprobe Multimeter 5XP-A - Page 1
Forum section: electronics / testgear

author: daveuk
author_rank: Newbie
timestamp: April 22, 2017, 02:59:57 pm
content: Hello everyone. My name is Dave from the UK and I would apreciate some help with a schematic for an Amprobe 5 XP-A multimeter as I have managed to kill it with a spark from a lawnmower magneto. The display just reads "OL" for all functions except NCV. I have contacted the manufacturers with no luck. Any help or pointers would be most welcome.Cheers Dave

author: retiredcaps
author_rank: Super Contributor
timestamp: April 22, 2017, 05:17:18 pm
content: It is unlikely you will find a schematic.Post clear focused pictures of both sides of the pcb. Perhaps one of the input protection components may be damaged. Once we see the pictures, we can make suggestions on what to test.

author: daveuk
author_rank: Newbie
timestamp: April 22, 2017, 09:44:55 pm
content: Thank you retiredcaps for your prompt reply. I will do as you suggest.

author: joeqsmith
author_rank: Super Contributor
timestamp: April 23, 2017, 01:00:33 am
content: Quote from: daveuk on April 22, 2017, 02:59:57 pmI doubt you would find too many meters that would survive a mag or secondary of a microwave oven transformer. You may want to consider getting a free one from Harbor Freight for these what if sort of tests.I've managed to damage my share of meters. Normally what I see with the better meters is a few transistors may short. However the meters do not read OL like yours. Instead they read low values. On the meters that are not so robust, they will do what you describe. There is normally not enough protection circuitry to protect the control IC. Sadly, they go to the recycle bin after this.With a mag, hard to say. Something may have opened up but my guess is you are looking at a lot of wasted time and in the end a new meter.
[Solved] Help needed to decide between a Brymen BM257S and BM235 - Page 1
Forum section: electronics / testgear

author: HoracioDos
author_rank: Frequent Contributor
timestamp: April 12, 2017, 01:37:42 pm
content: Hello!I want to buy a second DMM to replace a Mastech 830. I already have a Brymen BM235 and I'm so happy with it that I can't decide between a second BM235 or a BM257S. I don't know if It won't be wise to buy two identical units if the BM237s costs only $20 more.I've been reading the specs and if I understood them correctly, the BM237 seems to be a little bit more accurate in some aspects. I would like to build my own interface based on this thread in the future.https://www.eevblog.com/forum/testgear/brymen-bm257s-diy-pc-datalogging-usb-cable/msg746992/#msg746992So I'll appreciate any thought that helps me to decide.Thanks in advance.

author: noidea
author_rank: Unknown
timestamp: April 12, 2017, 01:52:43 pm
content: I find the bar graph on the 257/s is a very useful featureI find the orange backlight of the 257/s less sexy than blue of the 235 (or Daves one at least) not sure about the non EEVblog branded ones

author: ericloewe
author_rank: Unknown
timestamp: April 12, 2017, 03:18:22 pm
content: Well, if you want the PC interface, you need the 257. Or hack the hell out of the 235.

author: HoracioDos
author_rank: Frequent Contributor
timestamp: April 22, 2017, 09:07:58 pm
content: Helpful answers in this threadhttps://www.eevblog.com/forum/testgear/what-do-you-think-of-your-eevblog-brymen-bm235-multimeter/
Rigol DSA-815 - Amplitude calibration - Page 1
Forum section: electronics / testgear

author: K1JOS
author_rank: Regular Contributor
timestamp: April 21, 2017, 10:16:43 pm
content: ANyone know how to adjust the power calibration? My 815 is reading -1.5 dB on a NIST 50MHz 1 mW (0 dB) reference. I did set the autocalibrate with no improvement. I cannot find the "Acc Calibrate" as mention in the manual.Any advice appreciatedJerry NY2KW

author: xrunner
author_rank: Super Contributor
timestamp: April 22, 2017, 12:36:21 am
content: Quote from: K1JOS on April 21, 2017, 10:16:43 pmI have a DSA815. I just searched the manual for "Acc Calibrate" and did not find it. Where in the manual did you find that?

author: K1JOS
author_rank: Regular Contributor
timestamp: April 22, 2017, 01:08:37 am
content: Its in the March 2015 DSA 800 series User Manual page 161. It was not in my original 2013 User Manual so I assumed added later in newer firmware. I am running firmware v1.08 so I looked at the release notes from past firmware and it seems they added this after v 1.09. Now I see they are up to 1.15 so maybe I should update the firmware. Have to read how not to lose my 'licenses'.Jerry NY2KW

author: xrunner
author_rank: Super Contributor
timestamp: April 22, 2017, 01:18:07 am
content: Quote from: K1JOS on April 22, 2017, 01:08:37 amOK.Regarding your amplitude check, what sort of accuracy were you expecting to observe? Did you look at the specs of this unit?

author: K1JOS
author_rank: Regular Contributor
timestamp: April 22, 2017, 01:10:19 pm
content: The SA specs quote +/- 0.4 dB which I though were pretty good. It turns out that my -1.5dB loss problem was not with the SA but with the 50 ohm coax cable... switching to a 'brand' name (though still made in China) brought things back to spec...actually within (-)0.25 dB of my NIST source. Good lesson here, at least for me :-)Jerry NY2KW

author: K1JOS
author_rank: Regular Contributor
timestamp: April 22, 2017, 01:11:29 pm
content: I still would like someone with the latest version firmware to check if there is an additional "Acc Calibrate" function.Jerry NY2KW

author: xrunner
author_rank: Super Contributor
timestamp: April 22, 2017, 01:36:06 pm
content: Quote from: K1JOS on April 22, 2017, 01:10:19 pmYea I just checked mine @50 MHz 0 dBm with my Agilent 8648A (which isn't as accurate amplitude-wise as your source), but I get -0.48 dBm.On the bad cables I say welcome to my world. I've had lot's on run-ins with poorly made cables and BNCs.

author: Daruosha
author_rank: Regular Contributor
timestamp: April 22, 2017, 01:37:13 pm
content: Quote from: K1JOS on April 22, 2017, 01:11:29 pmYes, there is.
Best way to measure the strength of the magnets - Page 1
Forum section: electronics / testgear

author: eeguy
author_rank: Regular Contributor
timestamp: April 22, 2017, 03:11:06 am
content: Hi, I bought some magnets from hardware stores. Is gaussmeter the best way to measure the strength of the magnets? Which product do you recommend?

author: chipss
author_rank: Contributor
timestamp: April 22, 2017, 03:32:42 am
content: Thank you, great info!

author: eeguy
author_rank: Regular Contributor
timestamp: April 22, 2017, 03:35:03 am
content: Quote from: evb149 on April 22, 2017, 03:26:02 amCan you recommend magnetic field sensors that could measure a wide range of strength please?

author: AllTheGearNoIdea
author_rank: Unknown
timestamp: April 22, 2017, 07:21:16 am
content: There are lots on eBay from china but as usual it's difficult to tell if they will work well. If your on bothered about making relative measurement between your magnets I think there are a number of pretty cheap Hall effect transistors easier available from RS Farnel etc that are easy to implement in a simple meter design.

author: y33t
author_rank: Contributor
timestamp: April 22, 2017, 09:37:33 am
content: You can also use an android phone or tablet with the relevant sensor and can even log the data. My 2 cents.

author: ebastler
author_rank: Super Contributor
timestamp: April 22, 2017, 11:14:53 am
content: Quote from: eeguy on April 22, 2017, 03:11:06 amI would say that the "best way to measure the strength" depends on what you want to do with the magnets. If you want to lift something or hold something in place mechanically, the holding force will depend on the geometry of the magnet (and its counterpart) too. It would probably be best to actually measure the mechanical force instead of the field strength in that case.
Voltage and current in 6:1 balun for sensitivity measurement  - Page 1
Forum section: electronics / testgear

author: AllTheGearNoIdea
author_rank: Unknown
timestamp: April 22, 2017, 07:12:37 am
content: Hi all need some advice on trying to do a sensitivity measurement in a VHF fm receiver. This is designed to have a 300 ohm balanced feeder and I only have 50 ohm unbalanced outputs on my signal generator. I would normally build a resistive pad to Match impedance. The impedance and the losses are easily calculated in a resistive pad but this won't produced a balanced feed. If I build a 6:1 balun I'm not sure about the voltage levels on the output side of the balun. Will it be 6 times greater or smaller. Even if I build something not sure how I could calibrate it back so my sensitive measurement are in anyway accurate. Perhaps I'm over thinking can anyone give some advices on how to do this. Assume I have reasonable amount of test gear, just no idea how to use it.Thanks

author: T3sl4co1l
author_rank: Super Contributor
timestamp: April 22, 2017, 07:17:10 am
content: Voltage ratio (turns ratio) is sqrt(impedance ratio).Tim

author: AllTheGearNoIdea
author_rank: Unknown
timestamp: April 22, 2017, 07:24:53 am
content: Ok thanks, I guess I still need to try and measure the output voltage side, for calibration purposes. I'm wondering how the material losses and construction will affect the calculated voltages etc.Regards Chris
EEVblog Multimeter - Page 1
Forum section: electronics / testgear

author: tizi
author_rank: Contributor
timestamp: April 20, 2017, 12:24:43 pm
content: Well got my multimeter today very happy with it better than the disk smith one Ive been using for 5yrs.Nice one daveCheers tizi

author: BBBbbb
author_rank: Unknown
timestamp: April 20, 2017, 01:20:41 pm
content: It's nice that you're happy with it, but do you really need to be posting it all over the forum?And are you sure you've got the EEVBLOG new multimeter or a BM rebrand? Not sure Dave has his new multimeter available yet...If it is the new secretive multimeter please share some more info with us - pictures, impressions...

author: tizi
author_rank: Contributor
timestamp: April 21, 2017, 12:35:11 am
content: BBBbbb - have you forgotten to take your tablets today ?

author: Simon
author_rank: Unknown
timestamp: April 21, 2017, 04:15:22 pm
content: Quote from: tizi on April 21, 2017, 12:35:11 amI think you are in need of tablets. You posted a seperate topic to link to this one, are you serious or looking to get banned? and in case you need further clarification I am he who does the banning!
hi  i need  hex file LCR transistor tester by efan & haoqixin v2.68 - Page 1
Forum section: electronics / testgear

author: mourad3d
author_rank: Newbie
timestamp: April 19, 2017, 09:30:22 pm
content: hii need hex & eeprom files LCR transistor tester by efan & haoqixin v2.68

author: mourad3d
author_rank: Newbie
timestamp: April 21, 2017, 12:10:50 pm
content: plz help me

author: azer
author_rank: Regular Contributor
timestamp: April 21, 2017, 01:33:05 pm
content: The firmware is based on the one talked about in this threadhttps://www.eevblog.com/forum/testgear/$20-lcr-esr-transistor-checker-project/but with some modifications by the chinese for the display type and I think the addition of the graphics and it is usually referred to as the Mtester if you do a serach on the forum.If you ask in the thread they could help you compiling the firmware suitable for your device.An older firmware for the Mtester is available herehttps://www.eevblog.com/forum/testgear/lcr-t4-mtester-v2-07-lcr-meter-black-block-issue/msg879842/#msg879842and herehttps://www.eevblog.com/forum/testgear/$20-lcr-esr-transistor-checker-project/msg932736/#msg932736You can sometimes also ask the seller of the device for new firmwares.