hybridfree/eevblog-posts huggingface dataset:
daves great "luck" - Page 1
Forum section: electronics / testgear

author: decibel61
author_rank: Newbie
timestamp: April 09, 2017, 10:27:13 pm
content: Sooo....dave....what happened to that 300,000 $ scope?

author: Someone
author_rank: Super Contributor
timestamp: April 10, 2017, 12:42:09 am
content: No doubt it was promptly returned to Keysight and re-entered their pool of promotional/demo units.

author: Harb
author_rank: Regular Contributor
timestamp: April 10, 2017, 12:44:36 am
content: LOL

author: DaJMasta
author_rank: Super Contributor
timestamp: April 10, 2017, 01:28:13 am
content: Easy come, easy go, as they say. He showed up to the lab two days later and couldn't find it, turns out he took it out to the dumpster room himself in a pile of cardboard boxes and the garbage collectors took it away the next morning.A real shame, but I'm sure he'll scrounge something else up soon enough.

author: Keysight DanielBogdanoff
author_rank: Unknown
timestamp: April 10, 2017, 03:25:59 pm
content: Quote from: Someone on April 10, 2017, 12:42:09 amI'm pretty sure that scope had an Agilent label...

author: kcbrown
author_rank: Frequent Contributor
timestamp: April 10, 2017, 04:00:20 pm
content: Quote from: DaJMasta on April 10, 2017, 01:28:13 amProbably because it failed the drop test ...QuoteWell, seeing how the dumpster seems to be where his deliveries take place, yeah ... (though the delivery service seems to be nice enough to remove the items from the packaging for him. Wonder if he pays extra for that service ...)

author: janekivi
author_rank: Frequent Contributor
timestamp: April 10, 2017, 06:18:59 pm
content: Quote from: Keysight_DanielBogdanoff on April 10, 2017, 03:25:59 pm: ) I saw only Keysight everywhere on the scope screen...from this point forward -https://youtu.be/d_S9YsD9Y0c?t=375
Rigol DS1054Z onscreen spelling error - Page 1
Forum section: electronics / testgear

author: JimH809705
author_rank: Newbie
timestamp: April 08, 2017, 02:32:33 am
content: Found a spelling error today. "Pulses" is spelled as "Pluses in 4 places. In the attached images, errors are circled in red. green is correct.

author: xrunner
author_rank: Super Contributor
timestamp: April 08, 2017, 02:33:36 am
content: They didn't win the test equipment spelling bee - no.But yea, we all know about it.

author: jjoonathan
author_rank: Frequent Contributor
timestamp: April 08, 2017, 03:52:26 am
content: Hey, at least you have a pulse counter. That feature was completely MIA for a long time and IIRC is still MIA in the DS4000 and DS6000 series

author: Fungus
author_rank: Super Contributor
timestamp: April 08, 2017, 12:56:18 pm
content: This is well known around here.(and Rigols refusal to fix it might be an in-joke by the engineers)Quote from: blueskull on April 08, 2017, 02:58:27 amOuch!

author: Mechatrommer
author_rank: Super Contributor
timestamp: April 08, 2017, 03:36:32 pm
content: in some region in China, due to difficulty in pronouncing "pulses", they decided that spelling "pluses" should be the correct word. so, it is you who are wrong. and in some places in the scope they retain the word "pulses" so everybody will satisfy, nobody will say they are entirely right nor they are entirely wrong. this was my friend's friend's friend's friend's friend's friend's friend's friend told me.

author: janoc
author_rank: Super Contributor
timestamp: April 08, 2017, 04:36:48 pm
content: Quote from: JimH809705 on April 08, 2017, 02:32:33 amYeah, noticed this one two days ago as well

author: xrunner
author_rank: Super Contributor
timestamp: April 08, 2017, 06:40:03 pm
content: Quote from: Mechatrommer on April 08, 2017, 03:36:32 pmHaha - maybe. That sounds more like an urban legend to me.

author: ebastler
author_rank: Super Contributor
timestamp: April 08, 2017, 06:44:15 pm
content: ...

author: RoGeorge
author_rank: Super Contributor
timestamp: April 08, 2017, 06:48:04 pm
content: As long as people understand what is it all about,

author: rsjsouza
author_rank: Super Contributor
timestamp: April 08, 2017, 06:53:32 pm
content: Their english is better than my chinese...

author: Mechatrommer
author_rank: Super Contributor
timestamp: April 09, 2017, 03:07:09 am
content: Quote from: xrunner on April 08, 2017, 06:40:03 pmyeah but i'm surprised no long time member care to mention that this error was first mentioned here about 2 years ago, and no FW fix yet so far, that we have to live with it day by day...https://www.eevblog.com/forum/testgear/rigol-1104z-pulse-counter-weirdness/msg799279/#msg799279so an urban legend it is...
TI CC-debugger from eBay? - Page 1
Forum section: electronics / testgear

author: onesixright
author_rank: Frequent Contributor
timestamp: April 10, 2017, 09:25:01 am
content: Anyone that has experience with the CC-Debugger from eBay?eBay auction: #http://www.ebay.com/itm/CC-Debugger-and-Programmer-Downloader-for-RF-System-on-Chips-ICSH015A-/291997463057?hash=item43fc67b211:g:LUYAAOSw44BYdjx8The price difference is substantial, like 10 USD on eBay vs 60 USD on ti's website.Thanks!

author: Fred27
author_rank: Unknown
timestamp: April 10, 2017, 02:34:59 pm
content: I need one for one-off use, so didn't feel too guilty about buying a clone. It worked fine.

author: brozier
author_rank: Contributor
timestamp: April 10, 2017, 02:51:10 pm
content: If its anything like the Keil u-Link clones you will have no static protection on the USB side and reduced static protection the device side!So okay to use if you observe static handling precautions and likely to fail quickly if you dont!

author: ebclr
author_rank: Super Contributor
timestamp: April 10, 2017, 10:04:19 pm
content: This one works, and is cheaperhttp://www.ebay.com/itm/Emulator-CC-Debugger-For-Zigbee-CC2530-CC2540-Bluetooth-4-0-/332033466628?hash=item4d4ebca104:g:M6YAAOSw44BYK9Ja
Agilent DSO1024 LAN Connection - Page 1
Forum section: electronics / testgear

author: Joee
author_rank: Newbie
timestamp: April 08, 2017, 07:12:19 pm
content: Hi all,I read a lot of threads here about my newer scopes when I looked at my spare scope DSO1024 and wondered if it's possible to hack something there. Not that I needed it but...I found that it has already the highest BW, no license upgrades etc. when I had a look at the firmware file and found a lot of web code and dhcp stuff. I opened it a had a look at the communication board and there was the Ethernet connector missing. Has anybody here tried to put one in and did it work. Has it a web interface?

author: SeanB
author_rank: Super Contributor
timestamp: April 08, 2017, 07:56:18 pm
content: Looks like the main board is also missing the Ethernet PHY chipset and crystal. Right there under the ribbon cable, and very likely if you soldered one in along with the right crystal it likely would work.
Does anyone updated the Micsig TO1104 video record function? - Page 1
Forum section: electronics / testgear

author: jacklee
author_rank: Regular Contributor
timestamp: March 01, 2017, 09:22:17 am
content: I saw Micsig TO1104 published a video record function, anyone updated?I would also want to know if the Wi-Fi function is worth to buy?Thanks if someone can help.

author: AndyP
author_rank: Contributor
timestamp: April 08, 2017, 12:48:11 pm
content: I've updated to add the record function, though I've not used it much (tried it a few times but that was all). It's a nice idea being able to grab the video to show dynamic behaviour.As for wifi, the main use has been for firmware updates you can do perfectly well with a USB stick. I did install the labview software and it works fine allowing a clone of the 'scope screen on the PC and some automation however it's not my normal use case and I would have preferred a usable web interface instead of needing to install a ton of NI software.There will be firmware out shortly with the serial decoder in, I've used the i2c decoder and it all works fine, including triggering off the serial decoder.So in summary:1: video playback interesting occasionally useful2: wifi not useful for me until a fast web interface available and that's not in their plans.
Rigol DS1054Z compensation signal output - Page 1
Forum section: electronics / testgear

author: palindrom71
author_rank: Contributor
timestamp: April 08, 2017, 08:03:23 pm
content: Hi!I just unpacked, updated and upgraded Rigol DS1054Z (quiet fan on its way). After a moment of playing around, I found that square wave from compensation terminal of Rigol (yellow) has a poor rise time compared to compensation signal from nano DSO201 () (cyan).Is that normal? I thought that probe should be compensated on a very sharp rising edge.

author: David Hess
author_rank: Super Contributor
timestamp: April 08, 2017, 11:41:41 pm
content: That is normal; probe compensation for input capacitance does not require a high bandwidth or fast edge. Limiting the oscilloscope bandwidth to 20 MHz usually makes probe compensation easier.Some oscilloscopes do produce a fast edge from their probe compensation output which can be used for high frequency probe transient response calibration but that is the exception and it requires a probe tip adapter to make a high bandwidth connection.

author: rstofer
author_rank: Super Contributor
timestamp: April 09, 2017, 02:37:17 am
content: The rise time on my DS1054Z is 3.6 uS so the same order of magnitude.

author: palindrom71
author_rank: Contributor
timestamp: April 09, 2017, 11:07:17 am
content: Thank you!I checked probe again - touching CR 3V battery (it won't get any faster than this) and it was just slightly undercompensated.As I'm putting together DIY wave generator, I'll make one fast output on ADCMP580 as a reference edge.
fluke 123 scope meter battery replacement - Page 1
Forum section: electronics / testgear

author: abid0011
author_rank: Contributor
timestamp: April 08, 2017, 09:01:45 am
content: hi i replace the fluke 2000 mah with the 4000 mah battery.what i did is i remove the wired connection from the original battery pack and installed on the 4000 mah 1.2 volts 4 cells.now the problem is after charging the battery the battery drains very quickly.does the battery need completer refresh .when select the refresh option it shows 12 hours.any suggestion.thank u

author: WackyGerman
author_rank: Regular Contributor
timestamp: April 08, 2017, 10:29:02 am
content: I suppose a refresh for the new battery . I also replaced the battery with a new one and did a refresh . Now it works for longer time . Look here in the forum for the thread of the battery replacement of the scopemeter to get more informations
Phillips Fluke pm6304 service manual search - Page 1
Forum section: electronics / testgear

author: coromonadalix
author_rank: Super Contributor
timestamp: April 06, 2017, 08:52:08 pm
content: helloI need an ultra clean service manual for the unit 5 section in the service manual, around page 147 148I have found many links for the same service manual around (64megs), but it is not clean enough to reproduce the pm9565 board (unit 5 section)Has anyone have a clean sharp onethks @all

author: HighVoltage
author_rank: Super Contributor
timestamp: April 06, 2017, 09:12:24 pm
content: I believe I have a clean copy, will have a look tomorrow

author: kada
author_rank: Contributor
timestamp: April 06, 2017, 09:14:59 pm
content: Looks like you downloaded pdf from xDevs site? The original service manual consists of a bunch of jpg scans which I glued together in this pdf. Let me try to find those jpegs tomorrow.

author: coromonadalix
author_rank: Super Contributor
timestamp: April 06, 2017, 10:38:08 pm
content: yes from xdev too but they are all the same quality

author: kada
author_rank: Contributor
timestamp: April 07, 2017, 11:19:36 am
content: Not sure will this really help

author: HighVoltage
author_rank: Super Contributor
timestamp: April 07, 2017, 11:45:33 am
content: My copy of the service manual is 67 MB in sizeIf that is different than what you have, let me know and I can send it your way.

author: coromonadalix
author_rank: Super Contributor
timestamp: April 07, 2017, 09:09:56 pm
content: @kada nope its the same quality, i need more loll@High voltage if you can send me a link thks

author: HighVoltage
author_rank: Super Contributor
timestamp: April 07, 2017, 09:28:06 pm
content: I have no online place for it.Send me a PM with your email address that can receive 67 MB and I will send it your way
Heading Meanings in a DG1062Z Menu - Page 1
Forum section: electronics / testgear

author: ximac
author_rank: Contributor
timestamp: April 07, 2017, 04:37:23 pm
content: Does anyone know the meaning of the headings in the 'Utility - Test Cal - Manual Cal' menus of the DG1062Z; such as 'High Freq Flat', etc? 'Ampl' is fairly obvious but not the actual attenuator settings of its 50-odd items. I have prudently left them all alone but curiosity does make me ask. Thanks - Joe.
Lab for kids - Page 1
Forum section: electronics / testgear

author: ebclr
author_rank: Super Contributor
timestamp: April 05, 2017, 04:08:57 pm
content: Some marketing people have no sense of reality

author: LaurentR
author_rank: Frequent Contributor
timestamp: April 05, 2017, 05:41:19 pm
content: Are you saying that as a kid, you were not soldering PGAs with an iron 5 times your size while watching the back of a 7.5 digit DMM?

author: MK14
author_rank: Super Contributor
timestamp: April 05, 2017, 06:13:29 pm
content: He must be a really clever kid. The 8 digit accurate probes are connected wirelessly (apparently) to the meter.I did not even know you could do that.

author: Fungus
author_rank: Super Contributor
timestamp: April 05, 2017, 06:17:17 pm
content: Quote from: LaurentR on April 05, 2017, 05:41:19 pm...that plugs into your elbow.I wonder what Daniel has to say about this.

author: Supercharged
author_rank: Regular Contributor
timestamp: April 05, 2017, 06:54:24 pm
content: Quote from: MK14 on April 05, 2017, 06:13:29 pmNevermind the multimeter, he apparently has a wireless oscilloscope probe

author: MK14
author_rank: Super Contributor
timestamp: April 05, 2017, 06:57:12 pm
content: And an instantly teleporting/changing multimeter. I must get one of those. (But not until they stop rotating 180 degrees, after switching bug).2 position switch, pos1 = Fluke, pos2 = Keysight. I did not realize the firms had merged

author: Gregg
author_rank: Super Contributor
timestamp: April 05, 2017, 11:23:39 pm
content: He has a big career ahead of him in advanced marketing. I mean he might know better than to hold on to the hot end of the soldering iron, unlike some other marketing pictures. It only goes to show that marketing and reality are mutually exclusive.

author: Shock
author_rank: Super Contributor
timestamp: April 07, 2017, 02:50:20 pm
content: Induct him at once into the Ahmed Mohamed school of electronics posing.
DG1000Z and arbitrary function - Page 1
Forum section: electronics / testgear

author: vsavic
author_rank: Newbie
timestamp: April 05, 2017, 12:46:26 am
content: Hi all,I'm playing with my first fn. generator and I have a question about it (I hope this is the proper section).I want to simulate UART signal for some simple message for example "HELLO".So, I transformed this message to this hex:20002000200020003000200020003000200030003000 20003000200030002000200020003000200030003000 20002000200030003000200020003000200030003000 20002000200030003000200020003000200030003000 20003000300030003000200020003000200030003000H E L L 0(Hex file is normal with little endian format, here I just separated it like this to be easier to read it).And then I saved that as RAF file on USB and loaded it as arbitrary function on DG1022Z.So, I'm getting on my oscilloscope square signal, but I'm also getting negative voltage before my square pulse and after that. Why is that?And also, I'm guessing that's the reason why I'm not able to decode this signal on my oscilloscope?

author: LaurentR
author_rank: Frequent Contributor
timestamp: April 05, 2017, 01:06:56 am
content: First thing, on your AWG, you need to set up the amplitude of the signal. By default AWGs tend to be set up for 0V-centered AC signals (1 or 2 V peak-to-peak).So find the option to set the amplitude and offset so that your waveform is between 0 and Vmax of your choice (Vpp = Vmax, offset = Vmax/2).Alternatively, there is probably a mode to enter Vmin and Vmax directly.Now you should see a more traditional TTL/CMOS signal that bottoms out at 0V.

author: vsavic
author_rank: Newbie
timestamp: April 05, 2017, 07:29:03 pm
content: Thanks for your reply LaurentR, this solved one part of the mysteryBut for other part of this mystery, when I changed the frequancy to 9600 to match the baud which is set on my oscilloscope I ended up with signal which does not look like digital signal (no squares), so it looks like for every 1 and 0 that I'm sending I need to readjust the sample rate.But I couldn't find in doc. if I can specify that somewhere in file header or not, or just to "duplicate" data, so instead of having 1 0 1 0 for example to have 111 000 111 000 in order to get square signal?
How BW=sample_rate/2.5? - Page 1
Forum section: electronics / testgear

author: ericweddington
author_rank: Newbie
timestamp: April 05, 2017, 11:11:35 am
content: I've read inYokogowaand Tek app notes that bandwidth of a DSO is sampling_rate/2.5. For an analog o'scope, I can intuitively understand the -3 dB point, but for digital types, could someone explain how it is derived?

author: wraper
author_rank: Unknown
timestamp: April 05, 2017, 11:41:34 am
content: BW and sampling rate are completely different things.Quoteit is not derived. All that app note talks about is theminimum sampling rate requiredto correctly represent the signal of particular frequency.

author: nctnico
author_rank: Super Contributor
timestamp: April 05, 2017, 11:54:04 am
content: The factor 2.5 is basically the Nyquist frequency plus a margin to allow signal reconstruction algorithms (so your eyes can see the signal as a signal) and an anti-aliasing filter to do their work.

author: wraper
author_rank: Unknown
timestamp: April 05, 2017, 12:12:21 pm
content: Say you have a 4 channel scope with 100 MHz bandwidth spec, it's the same as with analog scopes (not worse than -3db @ 100MHz). And as it is a cheap scope, it has only 500 MSPS sample rate. All fine if you measure 100 MHz signal with only one channel enabled, you get full 500 MSps sample rate. But most of the scopes share their sample rate between the channels. Once you enable second channel, you get only 250 MSps sample rate which is marginally enough. Enable 3 or 4 channels and you still have the full 100 MHz analog bandwidth but only have 125 MSps sample rate and your signal won't be correctly shown on the display but some sort of distorted garbage instead. All that said given that the scope has a good Sin(x)/x interpolation, otherwise much higher sample rate will be required to acceptably restore the waveform.

author: ericweddington
author_rank: Newbie
timestamp: April 06, 2017, 05:17:37 am
content: Thank you everyone for the replies.
New DSO from Teledyne LeCroy: WaveSurfer 510 - Page 1
Forum section: electronics / testgear

author: 1Ghz
author_rank: Unknown
timestamp: April 05, 2017, 02:16:19 pm
content: Product spec:QuoteProduct page:http://teledynelecroy.com/oscilloscope/oscilloscopeseries.aspx?mseries=549Datasheet:http://cdn.teledynelecroy.com/files/pdf/wavesurfer510-oscilloscope-datasheet.pdf

author: Jono427
author_rank: Contributor
timestamp: April 05, 2017, 03:05:31 pm
content: Looks like $12,900.00 USD

author: tautech
author_rank: Super Contributor
timestamp: April 05, 2017, 06:54:08 pm
content: I do wonder if it's an updated WS3000 (SDS3000), it looks very similar:
fluke 123 scope meter vs fluke 88 v multimeter suggestion - Page 1
Forum section: electronics / testgear

author: abid0011
author_rank: Contributor
timestamp: April 03, 2017, 10:19:39 am
content: hello everyone.just thinking to buy a fluke.getting a used fluke 123 scope meter and 2 option is to buy a new fluke 88v millimeter.the fluke 123 is old unit. but its a dual channel and scope.does the fluke 123 still better than the 88v in terms of accuracy and functions.need suggestion.thank u.

author: jeroen79
author_rank: Frequent Contributor
timestamp: April 03, 2017, 02:53:00 pm
content: QuoteWhat do you want to use it for?They're different instruments that have some functions in common.What non-common functions do you need?How did you come to these two options?Why a scopemeter and why an automotive multimeter?Specs:http://www.fluke.com/fluke/nlnl/draagbare-oscilloscopen/fluke-120.htm?pid=55999http://www.fluke.com/fluke/m3en/digital-multimeters/fluke-88v.htm?pid=56148

author: abid0011
author_rank: Contributor
timestamp: April 05, 2017, 09:55:36 am
content: thank fro reply.need to use this 123 scope meter for electrical purpose.i am electrician work on cnc machines three phase and motors.work on cars etc.and now start learning electronics as hobbyist.need a meter which i can use as electrician and also as electronic hobbyist.got a used 123 scope meter.if this meter can fulfill the above requirement then no need to spend extra dollars on new.thank u

author: jeroen79
author_rank: Frequent Contributor
timestamp: April 05, 2017, 12:51:29 pm
content: You already have the 123 scopemeter?They could be be used but they're not that comparable.What do you value?The scope? Dual channels? Portability? Battery life? Builtin current measurement?

author: abid0011
author_rank: Contributor
timestamp: April 05, 2017, 01:31:33 pm
content: yes i already have the 123 scopmeter.current measurements / portability /

author: jeroen79
author_rank: Frequent Contributor
timestamp: April 05, 2017, 05:26:22 pm
content: Quote from: abid0011 on April 05, 2017, 01:31:33 pmThen the 88V (or other regular multimeter) wins.
dm-45 review - Page 1
Forum section: electronics / testgear

author: grifftech
author_rank: Frequent Contributor
timestamp: February 23, 2016, 04:36:08 am
content: I got this dmm for christmas. So far I like it's cat3 600 voltsauto ranging, the only problem is that it's cat3. The reason cat3 is a problem is the fuses (400 ma and 10 amp)are expensive (luckily I have not blown one yet) . (the AA battery is for scale)

author: RobertoLG
author_rank: Frequent Contributor
timestamp: February 23, 2016, 04:51:48 am
content: looks like it's a nice meter, with proper input protection and good input jacks too, nice giftthat's a Brymen isn't it?

author: retiredcaps
author_rank: Super Contributor
timestamp: February 23, 2016, 05:34:27 am
content: Can we get a clear focused picture of the entire pcb please?

author: crispy_tofu
author_rank: Super Contributor
timestamp: February 23, 2016, 05:58:08 am
content: Looks good.

author: grifftech
author_rank: Frequent Contributor
timestamp: February 24, 2016, 12:20:41 am
content: Quote from: retiredcaps on February 23, 2016, 05:34:27 amok

author: grifftech
author_rank: Frequent Contributor
timestamp: February 24, 2016, 12:22:11 am
content: Quote from: RobertoLG on February 23, 2016, 04:51:48 amgreenlee

author: Lightages
author_rank: Unknown
timestamp: February 24, 2016, 12:24:06 am
content: Quote from: RobertoLG on February 23, 2016, 04:51:48 amNo that is not a re-branded Brymen. Many of the Greenlee meters are, but not that one.

author: crispy_tofu
author_rank: Super Contributor
timestamp: February 24, 2016, 01:26:20 am
content: I don't see any PTCs/MOVs (unless they're on the other side)...

author: RobertoLG
author_rank: Frequent Contributor
timestamp: February 24, 2016, 01:56:09 am
content: Quote from: Lightages on February 24, 2016, 12:24:06 amah ok, nice meter anyway, I got that digitek you reviewed, from franky

author: RobertoLG
author_rank: Frequent Contributor
timestamp: February 24, 2016, 02:07:43 am
content: Quote from: crispy_tofu on February 24, 2016, 01:26:20 amthe shunt isn't visible too, probably on the other side

author: PedroDaGr8
author_rank: Super Contributor
timestamp: February 24, 2016, 02:09:55 am
content: I believe this is a rebadged Appa 70 series multimeter variant. Appa used to make a lot of Greenlee's stuff (maybe they still do along with Brymen, I'm not sure).EDIT @OP does it say Made in Taiwan on the back?

author: grifftech
author_rank: Frequent Contributor
timestamp: February 27, 2016, 11:55:10 pm
content: Quote from: PedroDaGr8 on February 24, 2016, 02:09:55 amIdk

author: retiredcaps
author_rank: Super Contributor
timestamp: April 05, 2017, 06:23:33 am
content: A fellow Canadian did a review and teardown of this meter.He says he paid $100 CDN which is probably with HST, PST and GST (taxes for non Canadians). A bit pricey for $100 IMHO.

author: grifftech
author_rank: Frequent Contributor
timestamp: April 05, 2017, 03:25:45 pm
content: wow this thread is back after over a year of inactivity
Tenma 72-1020 - My First Benchtop TrueRMS Meter! - Page 1
Forum section: electronics / testgear

author: HallmanLabs
author_rank: Newbie
timestamp: April 04, 2017, 11:31:52 pm
content: Hey guys, I searched the EEV forums for the older "Tenma 72-1020" and couldn't findanythingon it.I recently purchased one so I was curious to hear opinions on it, then I didn't find a threadThis model was released originally back in 2004 so I figured it would be on here somewhere. Probably retailed for around $500-$1k in 2004, but now it can be found new for under $200 with coupons/discounts.I was wondering what you guys think of this TrueRMS benchtop DDM at the price I paid ($190)? I couldn't find another meter that had nearly these features and with this much accuracy/precision.http://www.mcmelectronics.com/product/TENMA-72-1020-/72-1020Quick rundown on specs:QuoteQuote

author: nctnico
author_rank: Super Contributor
timestamp: April 04, 2017, 11:40:21 pm
content: The Vicy VC8145 comes close (is better in some areas worse in others) and is slightly cheaper. There won't be much difference in quality since Tenma is a low cost brand as well.

author: Lightages
author_rank: Unknown
timestamp: April 05, 2017, 03:55:30 am
content: That looks like the Uni-Tren UT804 with a different name slapped on it.http://uni-trend.com/productsdetail_1096_872_872.html
Hacking SDS1102CML - boot logo - Page 1
Forum section: electronics / testgear

author: vale_sarbu
author_rank: Newbie
timestamp: April 04, 2017, 09:55:13 am
content: Hello everybody. I'm new to the forum so this is my first post.Last night I updated my SDS1102CML to Lecroy firmware and noticed that the same logo appeared during boot.Things to work with: - Someone pointed out that the CFG file contains the Boot imageHints: Opening the CFG file you can see the name Siglent in a few places (Eg: se–golonhceT tne“giS.SDS -AKA: SDS Sig"ent Technolog-es)So onto the reverse engineering...If you alter the file it will give you a integrity error.- First test : increase one byte by 1 and decrease the next by 1. - Passed file integrity so it's a Checksum- Look for the Image in the file - It's 480x234 - begins at offset 0xD8 ends at 0x52518 and is a 24bit bitmap - 3 bytes per pixel- Replaced the image with a same sized picture:-Make checksum equal to 8 bit total - not working-16 bit checksum - still not working-24 bit working(For reference try keeping the checksum of the image 0xC703A1)Then compared the CML and CNL versions, they have the same image logo with a few differences:-CNL @ 0x94 has a 0, CML has a 1 (CML has +1)-CNL @ 0xD7 has a C6, CML has a C5 (CML has - 1)-That means that until 0x52518 (where the image ends) checksum shoud be identical for both scopes-After the end of the image there are two bytes that are in fact reverse order checksum -CML - 96 8DCNL - 9B F8-Difference between these is the same as the difference between the two footers (IN REVERSE 0x056B) so it seems like it's trying to maintain a constant total checksum. (maybe keeps a total Chksum of 3C88700)Conclusion:- You can change the image if you maintain the Checksum without any risk of damage- Also change the name of the device - same condition appliesIf you have any suggestions / ideas for future or your own research please feel free to post.Will post images of modified splash screen this evening.

author: vale_sarbu
author_rank: Newbie
timestamp: April 04, 2017, 06:46:03 pm
content: I've made the picture, sorry Keithley for being used with d**kbutts, I had no inspiration at the moment.

author: tautech
author_rank: Super Contributor
timestamp: April 04, 2017, 07:00:48 pm
content: Quote from: vale_sarbu on April 04, 2017, 06:46:03 pmThat's funny, thanks.Could be the start of some competition, the funniest screen on your DSO.Welcome to the forum.
Screen replacement for Brymen BM23x series - Page 1
Forum section: electronics / testgear

author: PeterMadach
author_rank: Contributor
timestamp: April 04, 2017, 08:08:23 am
content: Hey!Today I've noticed, that my not too old BM233's screen was badly scratchedI'd like to know where can I get a screen replacement for this model. As it still has its warranty, I haven't disassambled it yet, is there simple plexi outside that covers the screen, what I can replace easier (and cheaper) than the whole screen?

author: mimmus78
author_rank: Unknown
timestamp: April 04, 2017, 08:21:47 am
content: I think you should replace all front cover as transparent screen is molded to it.Where you get the meter?Inviato dal mio Nexus 6P utilizzando Tapatalk

author: PeterMadach
author_rank: Contributor
timestamp: April 04, 2017, 08:25:22 am
content: I got it from TME in Hungary.How expensive could that replacement part be? I mean, it bugs me, but I can live with it, if the reapir would cost too much.edit: I also contacted Brymen, I'll update the post if they get back to me

author: mimmus78
author_rank: Unknown
timestamp: April 04, 2017, 09:24:00 am
content: Peter I sent you a pm.Inviato dal mio Nexus 6P utilizzando Tapatalk
Brymen BM235 measuring low AC voltage - Page 1
Forum section: electronics / testgear

author: W0MPM
author_rank: Contributor
timestamp: April 02, 2017, 12:02:07 am
content: Need help understanding how the BM235 functions.Doodling around measuring the ripple on 300V DC on a 20kohm load. The BM235 in AC Auto showed 7mV. Great. Didn't believe it. So ... The HP-410B showed 700ish mV the RCA WV-98C 700ish the Fluke 8060A 700ish the Fluke 27/FM 700ish. Tek 465 Scope agreed at 2+peak to peak, (and since this is power supply ripple it is a sawtooth not sine and I don't remember the crest factor but all these other meters had no problem).Back to the BM235. In VFD mode it shows 0.6V. Which is in the ball park with the others and 'close enough'. Why the difference in the readings between the modes? I'm sure it's in the specs but I'm demonstrably not smart enough to extract the answer.I expected the AC Auto or manual mode to be more or as accurate as the VFD.I do really like the 235.Thanks, John

author: evava
author_rank: Regular Contributor
timestamp: April 04, 2017, 09:08:42 am
content: Probably problem with your measurement is overloading AC mV range by DC.It it common problem at many handheld multimeters.Always try to choose higher ranges first, or when you know that you are going to measure something AC, connect your multimeter through capacitor.More here:https://www.eevblog.com/forum/testgear/brymen-multimeters-fault/?topicseen
features / price of HP3314A - Page 1
Forum section: electronics / testgear

author: jberik
author_rank: Newbie
timestamp: May 14, 2014, 09:05:50 pm
content: Hello everyone,I was wondering if there is anyone, who is using HP3314A function generator? What are its pros and cons?What about the price of this unit? I got a chance to buy a used HP3314A for about 265 USD. Is this reasonable price?Thank you

author: wn1fju
author_rank: Frequent Contributor
timestamp: May 15, 2014, 02:13:01 pm
content: The HP 3314A is one of my favorite function generators from the 1980s. It does the usual sine, triangle and pulse waveforms to 20 MHz, although the triangle linearity can be a bit off at the upper frequency limit. Has variable symmetry, DC offset, AM/FM/VCO modulation, bursts waveforms, and on and on. What sets it apart from many others is the ability to "program" arbitrary waveforms. The programming takes some getting used to since you basically have to enter a slope and time duration for each segment. HP made an early version and a late version, the latter distinguished by a rocker on/off switch and the soft, "non-click" front panel buttons. HP also made a x3 output option which is nice (Option 001). The price you quoted is nothing special - I've seen them for much more and much less on eBay. But, at your price, I would insist on a working unit with return policy. I've bought a couple of broken ones over the years and fixed them. There are a couple of unobtanium HP hybrid ICs, but the rest is fixable. The pass transistors in the P/S can be problematic because HP used cheap-ass sockets (an easy fix). Lots and lots of these units were produced and I'm sure you can find dozens of opinions on the web.

author: daveyk
author_rank: Frequent Contributor
timestamp: April 02, 2017, 02:32:46 pm
content: Resurrecting and old topic here. Hopefully you are still around.I rescued an HP3314A from the junk pile. I don't think it is repairable.Error codes E30 and E34.No output.Q2 and Q10 were shorted on output board.With output board removed and in NO CAL mode, it is not generating signals on the A1 (Main Analog/RF Board). I took the shield off and tried to follow the trouble shooting diagram. U101 has an epoxy welt on it near pins 28/29. I am not sure if that is just a drop of epoxy from the manufacturing process or if it formed when the part burnt. I am guessing the latter.That U101 is probably an unobtainium part.You mentioned that you fixed a couple of these?If I don't take and put this back in the hazardous waste bin at work (where I found it), than I have to figure a way to get rid of it. It's a shame, it is from a lab environment and hardly a scratch on it and it looks brand new inside. Is it worth keeping for parts or should I toss it back in that bin? I would love to have t working and fixed.Help and thoughts appreciates.Dave

author: tecman
author_rank: Frequent Contributor
timestamp: April 02, 2017, 10:20:16 pm
content: You can find a better deal on ebay for a 3314. Average is around $ 150paul
Tektronix 420A for 300USD is it worh it? - Page 1
Forum section: electronics / testgear

author: Marek85
author_rank: Contributor
timestamp: April 02, 2017, 09:59:22 pm
content: Hi,I'm looking for a decent scope for home projects and I came across this tektronix 420A for 300 USD. Seller claims that it works fine and it wasn't used very often. It has 4 channels RS232, GPIB interfaces but I'm a bit concerned with only 200Ms/s. What do you think? Is it worh to jump into a scope with only 200Ms/s these days?

author: pigrew
author_rank: Frequent Contributor
timestamp: April 03, 2017, 02:33:22 am
content: Quote from: Marek85 on April 02, 2017, 09:59:22 pmThat oscilloscope actually only has 100MS/s sampling rate. It has 200MHz bandwidth.For examining digital signals, I'd suggest a sampling rate at last four times the digital sampling rate, so it would be difficult to look at digital signals faster than 25MHz.The higher bandwidth allows you to capture repeating signals at up to 200MHz.You likely can find a TDS500A or TDS700A series model for about the same money on eBay, but $300 is not too unreasonable.It's up to you if your work needs higher sampling rate bandwidth.Also note that the fans in these are a little loud.These have an internal memory that contains a battery, which will within the next ten years . It may be difficult to replace the battery when the time comes, and it'll give errors when it fails. I'm not sure if the calibration data would be lost, or or if is in EEPROM.Sent from my HTC 10 using Tapatalk

author: djnz
author_rank: Regular Contributor
timestamp: April 03, 2017, 03:53:42 am
content: That doesn't seem like a good price to me.

author: Marek85
author_rank: Contributor
timestamp: April 05, 2017, 06:37:48 pm
content: Quote from: pigrew on April 03, 2017, 02:33:22 amYeah I think I'll pass... I also thought it is ridiculously low. The 4 channels looked a bit tempting tho.

author: wraper
author_rank: Unknown
timestamp: April 05, 2017, 07:04:18 pm
content: When you can buy a good modern entry level scope for about $350-450, there is no point buying such a boat anchor which even cannot do high frequencies with real time sampling.
Fluke 123 scopemeter black lines on screen. - Page 1
Forum section: electronics / testgear

author: abid0011
author_rank: Contributor
timestamp: March 13, 2017, 01:34:18 pm
content: hi guys just buy a used fluke 123 scope meter.it has black line son screen horizontal and vertical.how to fix this issue.second thing is the battery charged but discharge very quicky.wonder if the refresh battery option which take 12 hours can improve?thanks

author: tooki
author_rank: Super Contributor
timestamp: March 13, 2017, 08:19:49 pm
content: There's an EEVblog video on repairing exactly that LCD fault on a ScopeMeter. Google will find it.The battery is probably worn out and needs replacing. (A refresh won't hurt it, but don't expect miracles.)

author: abid0011
author_rank: Contributor
timestamp: April 02, 2017, 07:43:17 pm
content: thank fro reply.i tried that method but still lines are there think to try again.the other thing about the battery is today i buy individual battery cells each cell is 4000mah 1.2v the battery pack with the fluke 123 is 2000mah.when open the original battery pack i remove the top covered pvc to copy the wiring connection i saw some two thing connected.can i remove the old wiring and solder to the new battery cells.need suggestion .thank u
Broken HP 3314A, Error E30 and E34. - Page 1
Forum section: electronics / testgear

author: daveyk
author_rank: Frequent Contributor
timestamp: April 02, 2017, 02:36:23 pm
content: I rescued an HP3314A from the junk pile. I don't think it is repairable.Error codes E30 and E34.No output.Q2 and Q10 were shorted on output board.With output board removed and in NO CAL mode, it is not generating signals on the A1 (Main Analog/RF Board). I took the shield off and tried to follow the trouble shooting diagram. Nothing at those variable caps. U101 has an epoxy welt on it near pins 28/29. I am not sure if that is just a drop of epoxy from the manufacturing process or if it formed when the part burnt. I am guessing the latter.That U101 is probably an unobtainium part. There are signals on its data input lines but nada coming out of any of its output pins.If I don't take and put this back in the hazardous waste bin at work (where I found it), than I have to figure a way to get rid of it. It's a shame, it is from a lab environment and hardly a scratch on it and it looks brand new inside and outside. Is it worth keeping for parts or should I toss it back in that bin? I would love to have t working and fixed.Help and thoughts appreciates.Dave

author: nctnico
author_rank: Super Contributor
timestamp: April 02, 2017, 02:44:27 pm
content: Did you check all the power supply voltages? Perhaps the shorted transistors took out some fuses. IIRC U101 is a special ASIC which transforms a triangle wave into a sine wave so if that is gone it is the end of the story.
IET ohmSource digital decade box?? Id love to see a teardown of this dave! - Page 1
Forum section: electronics / testgear

author: rwgast_lowlevellogicdesin
author_rank: Frequent Contributor
timestamp: October 03, 2015, 05:00:00 am
content: So I was looking around at different high end decade boxes and found this guyhttp://www.ietlabs.com/decaderes/decade-resistor/ohmsource.htmlI would love to see a teardown of this thing, I want to know how it works!! It can source 1watt, so this obviously isnt a digital pot. Its claimed accuracy is rather nice too! What do you guys think is it just using a FET/OpAmp as a variable resistor? Its pretty exspensive at $1000 dollars so I would kind of hope theres something more exotic under the hood!If anyone owns one of these please give any info you have, was it worth the money. I think for that kind of money I would betrusting vishay bulk metals with relay control alot more than this guy.

author: sorenkir
author_rank: Regular Contributor
timestamp: April 01, 2017, 11:07:09 am
content: Here it is (at last)!It is a 2000 vintage LabMetric OhmSource+ which seems to be comparable to the later IET model OS-260 (goes up to 24MOhm with 0.1Ohm resolution). Presumably same accuracy spec. (0.1%).Can be easily calibrated through the calibration menu by entering actual value of R29 to R1 measured on the output terminals in sequence.Front panel:MCU board and bistable relays array (the programmed value is effective even if the power is off):Resistor array, on the back of the relays board:Michel.
Transel Transalyzer Mark III - Page 1
Forum section: electronics / testgear

author: km4gig
author_rank: Newbie
timestamp: April 01, 2017, 04:17:34 am
content: Hi folks,I recently acquired a Transel Transalyzer Mark III scope/wattmeter/signal generator. The only documentation I can find on it is the manual on BAMA. Unfortunately that manual does not include a schematic. The main problem is that someone else has been inside this unit and there are a few questionable "repairs".Would anyone have a schematic so I can determine what the values might be on components that need to be replaced? If so, you'll be by best internet friend for at least a minute or three.
need suggestion on fluke battery cell conections - Page 1
Forum section: electronics / testgear

author: abid0011
author_rank: Contributor
timestamp: April 02, 2017, 07:48:46 pm
content: i buy individual battery cells each cell is 4000mah 1.2vthe battery pack with the fluke 123 is 2000mah.when open the original battery pack i remove the top covered pvc to copy the wiring connection i saw some two thing connected.can i remove the old wiring and solder to the new battery cells as on the fluke battery pack.need suggestion .thank u
KORAD KA3005P 230V PSU on 220V mains - Page 1
Forum section: electronics / testgear

author: HoracioDos
author_rank: Frequent Contributor
timestamp: March 31, 2017, 09:41:19 pm
content: My new Korad KA3005P PSU arrived today from Reichelt Elektronik. Input voltage is 230V / 50 Hz only and where I live the mains is 220V / 50Hz.AFAIK It should work between 210/230V if the frequency is the same. Is it safe to use it with 220V/50Hz or I should buy a 220V to 230V transformer?Thanks in advance.

author: cowana
author_rank: Frequent Contributor
timestamp: March 31, 2017, 10:07:27 pm
content: No problem at all.Internally it uses a linear transformer to step down to a much lower voltage, which then feeds linear regulators (both fixed and pass transistors). These all have plenty of headroom, so even 200V would be sufficient for the mains input.
HDMI 1.x Implementation - Is a 4GHz scope absolutely required? - Page 1
Forum section: electronics / testgear

author: smoothVTer
author_rank: Regular Contributor
timestamp: March 31, 2017, 01:39:17 pm
content: Hello EEVBloggers!In my current job, I have been tasked with implementing an HDMI interface. HDMI will come in from some already-qualified HDMI source, and on my PCB, I will convert it to various other formats using an Analog Devices ADV7* series converter IC. I've never dealt with HDMI or other signals of this high a bitrate, and the scope we have at work only has a 1GHz bandwidth. This forum posthttps://www.eevblog.com/forum/testgear/busses-serial-links-and-required-scope-bandwidth/msg873252/#msg873252mentions that HDMI 1.x requires a minimum 4GHz bandwidth to analyze signal fidelity.My question is:Provided that I do all my impedance matching correctly, use impedance control on the PCB, and have short trace lengths from the HDMI connector to the converter IC, can I get away with implementing this HDMI interface without such a high-bandwidth scope? I won't be able to probe TMDS signals at sender/receiver ends with any sort of accuracy ... that being the case, what do you think I can do to ensure signal fidelity without being able to see the waveforms directly? Is this a monumental task or can I get away with using our current scope?

author: nctnico
author_rank: Super Contributor
timestamp: March 31, 2017, 02:18:01 pm
content: The only thing you really have control over is the PCB layout so get that right. This PDF has the single ended and differential impedances required for many high speed busses:https://www.picmg.org/wp-content/uploads/PICMG_COMDG_2.0-RELEASED-2013-12-061.pdfYou can calculate trace widths and spacing using this online calculator tool:http://wcalc.sourceforge.net/cgi-wcalc.htmlFor FR4 an Er of 4.5 has given me the most accurate results and don't make the traces too thin otherwise the etching tolerances cause a large error. You can use a simulator like Sonnet Lite to verify the structure but that is likely overkill. IMHO there isn't much use for looking at eye patterns because you'll need the right probes and you can't tell whether you got the impedance wrong or the chip is designed on the edge.

author: TiN
author_rank: Super Contributor
timestamp: March 31, 2017, 02:59:32 pm
content: If you design things well, and stay way under the max limits (e.g. use short link, properly impedance controlled, continuous uninterrupted ground reference across complete HDMI routing, proper return via stitching on layers change/fanouts) then you might even not need scope at all. But of course, you will not be able to tell if your device able to pass HDMI compliance or not, without actual doing the measurement. Also there are different HDMI datarates, depending on resolution, refresh rate, and so. If one want to drive 4K@60Hz than 4Gig min scope would not be sufficientYou can check on standards and specs first. Take a look on DisplayPort stuff too, as both of these quite similar from hardware design point of view.
HP 34401A, Keysight BenchVue, and averaging - Page 1
Forum section: electronics / testgear

author: Pack34
author_rank: Frequent Contributor
timestamp: March 30, 2017, 04:00:28 pm
content: I've started using the datalogging feature in Keysight Benchvue with my HP 34401A meter. Is there a way to average the last X measurements? I'm hoping on rolling this into a calibration routine but would like to view the voltage over time as well as an average of the last 10 measurements. Is this possible inside BenchVue or would I need to write my own script for this?

author: HighVoltage
author_rank: Super Contributor
timestamp: March 30, 2017, 08:07:14 pm
content: From within BenchVue you can set the Aperture to different PLC values.If you have a certain amount of data that you want the average of, just export the data to Excel and then do the math on the spreadsheetExporting from BenchVue to Excel is very easy.

author: Dr. Frank
author_rank: Super Contributor
timestamp: March 30, 2017, 08:19:35 pm
content: The 34401A has averaging built in (via the Min Max function), but this can't be used for BenchView.BenchView does not offer any live math functions during data acquisition, and especially not a rolling average.So you would have to write your own routine, that's quite simple in any language, and you have the additional advantage to use more than 6 digits from the A/D, for better convergence of the statistical functions.Frank
[EU] ESI DB-877 8-decade resistor on eBay for €49 - Page 1
Forum section: electronics / testgear

author: alm
author_rank: Super Contributor
timestamp: March 17, 2017, 10:17:09 am
content: Not my ad and no relation to the seller (apart from having bought a few things in the past), but I do own this decade (paid more than €49) and think it is pretty nice (8 decades from 0.1 Ohm to 11 MOhm, 0.02% initial accuracy, 0.03% long term accuracy, very compact). I believe somebody posted teardown pictures on this forum before. €49 is well below normal eBay prices (cheapest one recently went for about $100 in the US), so I figured somebody here might be interested. You may even be able to offer a little less. From the description and pictures it seems to be in good condition, and 0.05 Ohm zero resistance is pretty good (close to if not within spec). The seller is in France, so shipping outside the EU may be expensive.eBay auction: #292058293821

author: sorenkir
author_rank: Regular Contributor
timestamp: April 01, 2017, 10:20:30 am
content: Spot-on!(not all ranges are like this on, but all are in-spec).Inside:Ohms:KOhms:0.2 Ohm:Hand-written codes (what does it mean?):Big thanks to "alm"!Michel.