hybridfree/eevblog-posts huggingface dataset:
MSO/DSO oscilloscope as logic analyzer - Page 1
Forum section: electronics / testgear

author: bobwidlar
author_rank: Contributor
timestamp: May 18, 2016, 07:54:50 pm
content: Dear all,I've been trying to measure the ADC I designed, and I would like to capture 3-bit digital data @ 25MHz via an oscilloscope. Currently I have Agilent DSO 3054A available. The problem is, I couldn't find a way to synchronize the data to the clock of 25MHz I'm providing on the CLK line of the digital inputs. A normal logic analyzer would do this, but is it impossible with the oscilloscopes?

author: nctnico
author_rank: Super Contributor
timestamp: May 18, 2016, 08:09:04 pm
content: AFAIK there are MSO oscilloscopes with external clock inputs but they are very rare. You'll have better luck with a real logic analyser.

author: tautech
author_rank: Super Contributor
timestamp: May 18, 2016, 08:36:37 pm
content: Quote from: bobwidlar on May 18, 2016, 07:54:50 pmCan't you do that with the analogue inputs?Then the full trigger suite available can be used.Did you watch Dave's recent vid where he's looking at a bus with his Agilent DSO?https://www.eevblog.com/forum/blog/eevblog-879-rs-1202-scope-bandwidth-hack-investigation/

author: rstofer
author_rank: Super Contributor
timestamp: May 19, 2016, 03:39:32 am
content: most of the time, I have to invent a trigger pulse. My projects tend to revolve around uCs or FPGAs so it is usually possible to output a synch pulse some time before things get interesting.

author: 2x2l
author_rank: Contributor
timestamp: May 19, 2016, 06:17:17 am
content: Quote from: tautech on May 18, 2016, 08:36:37 pmI skipped to about 15 minutes in just because I wanted to see what sort of visualization software he was going to use off that hack (I've never seen R&S' protocol analyzer software and I wanted to see how similar it was to the "Gold Standard" (at least in my mind,) Teledyne). Instead I saw a deformed chip with half of the wafers protective layer had been killed. Did he take fuming nitric acid to it or something?!

author: bobwidlar
author_rank: Contributor
timestamp: May 19, 2016, 08:58:28 am
content: Quote from: nctnico on May 18, 2016, 08:09:04 pmWell, the one I have has a CLK input but only active on protocol decoding mode.I can give it a trigger, actually I can use digital lines as trigger too (assuming acquisition trigger?). But the problem is the internal clock and the ADC's clock are not synchronized. You see a big bit error rate if the both sampling frequencies get close as expected. I want to get like 4 million data points, so I want to use the oscilloscope sampling as close as to ADC's Fs for maximum data rate. I didn't try to sync both clocks with external trigger in though.

author: nctnico
author_rank: Super Contributor
timestamp: May 19, 2016, 10:47:08 am
content: How about getting a long record, save it to disk and post-process it with PC software?
Global Specialties 2002 Function Generator - Page 1
Forum section: electronics / testgear

author: dennis h.
author_rank: Newbie
timestamp: May 17, 2016, 04:21:13 pm
content: Does anyone have a manual with a schematic? The 2002D is a different unit with a built in power supply. My 2002 has a separate power unit. Thanks for looking.

author: marco@caltestelectronics
author_rank: Newbie
timestamp: May 18, 2016, 11:43:50 pm
content: Hello Dennis:Sorry to give you the bad news, but the manual for the 2002 Function Generator is not available. It is one of the products that Global Specialties carried before being acquired by Cal Test Electronics. Some such materials were lost in translation and have not been recovered.If there is any other way we can help, please reach out to us at globlspecialties.com.Marco
Late 80's DIGITRON model 3228 K Thermometer - Page 1
Forum section: electronics / testgear

author: jct
author_rank: Contributor
timestamp: May 18, 2016, 01:42:52 pm
content: This particular type-K thermometer served me well over the past 2 decades. Unfortunately some intermittent readings on the Celcius selection started a while back, and now only the Fahrenheit selection side is working. I've contacted Digitron in the UK for a service manual / circuit diagram to assist in fault finding etc. The response was very quick, but (part of original message received):"Hello .............,The Digitron 3228K model was discontinued back in the late 80’s.I no longer have access to any documentation.So unfortunately I cannot assist you.Regards,Technical Support CoordinatorOffice: +44 (0) 1803 407828DigitronA brand of Elektron TechnologyWoodland Road,Torquay,Devon, England, TQ2 7AYwww.digitron.comwww.elektron-technology.com"If any of the members reading this and can assist on obtaining same, I will really appreciate. I know its not worth repairing, but I would like to get it back to working order, if possible - just for the sake of sentiment (images attached).regardsjct
If my scope is 20 MHz, any reason to get a probe rated to 100 MHz? - Page 1
Forum section: electronics / testgear

author: gooseEL34
author_rank: Regular Contributor
timestamp: May 19, 2016, 10:00:26 pm
content: ThanksTim

author: Keysight DanielBogdanoff
author_rank: Unknown
timestamp: May 19, 2016, 10:15:47 pm
content: The probe you get will effect your overall bandwidth. 100 MHz is probably more than you need with a 20 MHz scope.We actually had a blog post a few weeks back that talks about calculating the system bandwidth:https://keysightoscilloscopeblog.com/2016/03/30/what-is-oscilloscope-system-bandwidth-and-how-do-i-find-it/

author: tautech
author_rank: Super Contributor
timestamp: May 19, 2016, 10:41:47 pm
content: Quote from: gooseEL34 on May 19, 2016, 10:00:26 pmJust get a pair of these:http://www.ebay.com/itm/Two-P6100-DC-100MHZ-Oscilloscope-Scope-Clip-Probe-100MHz-For-Tektronix-HP-DY-/262248944156?hash=item3d0f41521c:g:2scAAOSwezVWup1cYou can't go wrong unless your scopes input capacitance is some crazy value outside the probes range of adjustment.

author: saturation
author_rank: Super Contributor
timestamp: May 21, 2016, 12:33:50 pm
content: Quality control on those no name probes can vary so best to get the higher MHz rated one. Also, a 60MHz and 100 MHz probe from no-name are essentially the same price, and for use at 20MHz both work very well as the Keysight document explain. If you are diligent on eBay you could find even higher rated probes for less money if you buy more than one. I bought a box of 4+ some years ago for ~ $20 as day-to-day banger probes; the construction could be iffy, but most of those in the box are still alive; I think we posted tests on eevblog forum some years ago.https://www.eevblog.com/forum/reviews/cheapest-100mhz-oscilloscope-probes-hands-on-review/msg100171/#msg100171
Help finding 0-150VDC (27A@15VDC and 2.7A@150VDC) power supply - Page 1
Forum section: electronics / testgear

author: BMOE
author_rank: Newbie
timestamp: May 17, 2016, 07:39:46 am
content: Hi.We have a product which will have a maximum power consumption of 400W, and will support a input voltage of 15-150VDC.Now we need to buy a variable PSU to be able to test this product. 400W@15VDC=about 27A and 400W@150V= about 2.7A.We dont need any fancy remote controll support or things like that.Do you have any ideas of affordable PSUs that would fulfill our needs?Regards./Matias

author: woodchips
author_rank: Frequent Contributor
timestamp: May 17, 2016, 08:34:51 am
content: Could try a three phase motor inverter with the output rectified and smoothed?Also a large dynamo driven by an induction motor?Most switched mode PSUs can be connected in series and parallel on their outputs so a switch bank?Suppose it depends if you want it smoothly variable from 0-150V, or can accept a range of voltages between 0-150V.

author: edavid
author_rank: Super Contributor
timestamp: May 17, 2016, 06:41:50 pm
content: You could split up the range and use an HP 6030A and an HP 6032A.Or, you could put 2X 6030A in parallel.

author: dacman
author_rank: Frequent Contributor
timestamp: May 17, 2016, 11:35:13 pm
content: What do you consider affordable?The BK Precision 9116 is a modern instrument, although two separate power supplies should cost less.

author: BMOE
author_rank: Newbie
timestamp: May 18, 2016, 06:19:40 am
content: Thank for your answers.We have loked at BK Precision 9116 and it fulfills all our needs except its to expensive for the time beeing.If we somehow can get down to 500$ I might convince my boss that we can buy one/Matias
Trying to get Tektronix TDS8000B OS install discs - Page 1
Forum section: electronics / testgear

author: joescape
author_rank: Newbie
timestamp: April 30, 2016, 03:36:32 am
content: So I picked up a TDS8000B at an auction a while back, but didn't realize that it came without a hard drive. I tried installing just a plain Windows 2000 OS and download the application firmware from the Tek website, but couldn't get that to work. When I tried to start the application software, it complained of missing files. Does anyone happen to have a copy of the OS restore discs and application firmware, ideally the XP version?

author: Monittosan
author_rank: Regular Contributor
timestamp: April 30, 2016, 08:53:06 am
content: You mite be able to get in contact with this guy.http://www.jvgavila.com/csa8000.htmHe was able to get what you need.Good Luck

author: Wuerstchenhund
author_rank: Super Contributor
timestamp: April 30, 2016, 10:04:58 am
content: Quote from: joescape on April 30, 2016, 03:36:32 amI don't think there are XP discs for the TDS/CSA8kB Series, if my memory serves me right then the latest variant ran Windows 2000 and the older variant ran Windows 98SE. I believe there also have been some hardware differences within the TDS/CSA8kB scopes (i.e. a different mainboard required for Windows 2000 to work).Depending how old your unit is your only option might be Windows 98 SE.

author: joescape
author_rank: Newbie
timestamp: April 30, 2016, 05:56:09 pm
content: Quote from: Monittosan on April 30, 2016, 08:53:06 amI did try to contact him a few months ago, but unfortunately he didn't reply.

author: joescape
author_rank: Newbie
timestamp: April 30, 2016, 05:58:24 pm
content: Quote from: Wuerstchenhund on April 30, 2016, 10:04:58 amI have read that some were upgraded to Windows XP if they were the TDS8000B/CSA8000B or had the upgraded CPU and memory, but they are probably rare. I'd even be happy with Win98SE, but it just seems like XP might be easier and support more current software. Anything would be better than nothing though.

author: joescape
author_rank: Newbie
timestamp: May 17, 2016, 01:55:44 am
content: Finally found some discs on eBay that I bought for around $300, so now my scope works!I read somewhere that this scope can do S-parameter measurements but I think you have to have the Tektronix iConnect software, which I can't find anywhere. So much potential wasted!

author: nctnico
author_rank: Super Contributor
timestamp: May 17, 2016, 08:21:46 am
content: Can you upload images to Tin's website?https://doc.xdevs.com/contact/
What about this? - Page 1
Forum section: electronics / testgear

author: scrub332
author_rank: Newbie
timestamp: May 16, 2016, 08:40:12 pm
content: Looking through the various eBay listings for multimeters and I come across this dodgy looking thing.http://www.ebay.co.uk/itm/Digital-LCD-Multimeter-Ammeter-Voltmeter-AC-DC-OHM-Circuit-Voltage-Tester-Buzzer-/182072250196?hash=item2a645a0f54:g:uhEAAOSwZG9Wj46qHow bad is it going to be in terms of safety?

author: rob77
author_rank: Super Contributor
timestamp: May 16, 2016, 08:48:04 pm
content: at that price it's going to be really bad - basically usable only for small voltages up to 50V max.

author: Lightages
author_rank: Unknown
timestamp: May 16, 2016, 09:07:36 pm
content: What rob77 said. It is a low priced piece of junk that might work or let you down when you need to depend on it. It will also be unsafe for anything over CAT1.

author: JPortici
author_rank: Super Contributor
timestamp: May 17, 2016, 07:12:44 am
content: aha! i've had the same one since forever. it was the go-to 10€ multimeter for us students back in high schoolSame form factor only that it's all yellow (orange-y) and no backlight

author: Whales
author_rank: Super Contributor
timestamp: May 17, 2016, 07:32:07 am
content: By all means go for a cheapie if it's your first meter (I'm assuming). Just don't use it for anything above 50V, as suggested by Rob.Later on you can look at better meters. Until then, get your hands on anything.
16 (14) Bit 250ksps 4Ch data aquisistion with PC - Page 1
Forum section: electronics / testgear

author: luky315
author_rank: Regular Contributor
timestamp: May 15, 2016, 10:03:10 am
content: I am looking for a simple and relatively cheap solution to sample blocks of data (a few seconds long) with a C# application (on a Windows PC) for further analysis.Is there a commercial USB based measurement system with 4 channels, a high resolution (>= 14Bit) and with a good API?

author: Andreas
author_rank: Super Contributor
timestamp: May 15, 2016, 11:50:00 am
content: PicoScope 5442A?

author: luky315
author_rank: Regular Contributor
timestamp: May 15, 2016, 12:32:25 pm
content: Thanks, but >1000€ is not relatively cheap and I don't need the high sampling rate of a "real" oscilloscope.

author: Carrington
author_rank: Super Contributor
timestamp: May 15, 2016, 02:02:12 pm
content: The ADALM1000 maybe? (16 bits, but 100KSPS only), around 50€.Another possible option is the Analog Discovery. (14 bits, 100MSPS), around 250€.

author: Gribo
author_rank: Frequent Contributor
timestamp: May 15, 2016, 09:28:50 pm
content: National Instruments have USB devices that might fit your requirements. The API (NI DAQ or DAQmx) is easy and very stable.However, 250KS/s and 14 bit might be a bit expansive.

author: rodpp
author_rank: Frequent Contributor
timestamp: May 16, 2016, 12:29:45 am
content: From National Instruments with 14 bits there are the USB 6001 that have 20KS/s and the USB 6009 that have 48KS/s. The first for US$189 (http://sine.ni.com/nips/cds/view/p/lang/en/nid/212383) and the last US$369 (http://sine.ni.com/nips/cds/view/p/lang/en/nid/201987).The 6002 and 6003 are 16 bits.

author: 71cudalover
author_rank: Newbie
timestamp: May 17, 2016, 03:29:36 am
content: Dataq has a nice product offering starting at 30 bucks for a an entry level demonstration unit.Sent from my SM-G860P using Tapatalk
HP 3852 calibration - Page 1
Forum section: electronics / testgear

author: cncjerry
author_rank: Unknown
timestamp: June 30, 2015, 05:52:33 am
content: I picked-up a loaded 3852a and have been reading thru the docs, etc., playing with programming. Interesting box. What I can't find is any information on how to calibrate either of the voltmeters, the 44701 integrating voltmeter specifically. Any pointers?

author: Julio2784
author_rank: Newbie
timestamp: January 18, 2016, 04:04:03 am
content: The calibration info for the HP 44701A is included as part of the HP 3852A service manual document.(a pdf file with over 700 pages)(This was a bit confusing for me also, there is no separate document for cal and maintenance of this plug in)The section that you want begins in chapter 6 at 6-23 for the performance tests, and 6-35 for the actual 44701A calibration procedure.

author: fisafisa
author_rank: Regular Contributor
timestamp: May 15, 2016, 09:35:54 pm
content: HiI cannot find the service manual in question.Have you got a link?

author: tautech
author_rank: Super Contributor
timestamp: May 16, 2016, 03:44:28 pm
content: Try this one:http://elektrotanya.com/hp_agilent-technologies_3852a_3853a_control_unit.pdf/download.html18.2 Mb 715 pages
Rigol DS2000 on its way to being replaced? - Page 1
Forum section: electronics / testgear

author: rramirez
author_rank: Contributor
timestamp: April 28, 2016, 07:43:34 pm
content: The Rigol DS2000 series is starting to be discounted a bit more than it previously was, maybe just because of Siglent pricing moves, IDK. Anyone have any insights or projections as to what Rigol will do with the DS2000 series; maybe release a Z series version?Russ

author: Sylphio
author_rank: Newbie
timestamp: May 17, 2016, 05:10:18 am
content: I seriously wonder too, i want to upgrade my old but reliable ds1052E and i cannot find any product roadmap from rigol.

author: tautech
author_rank: Super Contributor
timestamp: May 17, 2016, 05:55:21 am
content: Quote from: rramirez on April 28, 2016, 07:43:34 pmWhat Siglent pricing movements?Sure the SDS2000X and SDS1000X series are on promotional pricing ATM but that's for a fixed term only.Options and BW upgrades thrown in at the same pricing but I'm not aware of any other official discounting going on.http://www.siglentamerica.com/marketing_216

author: rf-loop
author_rank: Super Contributor
timestamp: May 17, 2016, 06:35:20 am
content: Quote from: tautech on May 17, 2016, 05:55:21 amAlso I do not know any official pricing changes. Only some very limited time promotional offers, exept that quality and after sales customer care is developing continuously average better. Of course this can also think so that the relative price is falling. (if wild sellers do not destroy this)
KPS305D 30V/5A power supply - Page 1
Forum section: electronics / testgear

author: Tainer
author_rank: Contributor
timestamp: May 15, 2016, 02:02:20 pm
content: Recently, I stumbled upon 'KPS305D' bench power supply on evil-bay. It goes for about 50USD and is rated at 30V/5A.There are various models from 303D to 605D. The most expensive one is rated 60V/5A and priced around 80$.It doesn't have an output 'on/off' switch, but I guess that could be modded easily.Has anyone used one of these? Does it have problems with overshoot/undershoot?

author: tautech
author_rank: Super Contributor
timestamp: May 15, 2016, 06:06:14 pm
content: See this thread:https://www.eevblog.com/forum/testgear/cheap-variable-switching-power-supply/

author: Tainer
author_rank: Contributor
timestamp: May 15, 2016, 07:04:20 pm
content: Thanks, it does seem like a next iteration of the PSU mentioned in the thread you linked. I do like that they've put separate fine/coarse adjustment pots.However, from what I've seen they removed the heatsinks on the 'KDS' unit and mounted the mosfets on a single aluminium plate. I don't think it's going to handle heat dissipation that well..
Probes for Brymen BM869s - Page 1
Forum section: electronics / testgear

author: th704
author_rank: Newbie
timestamp: May 15, 2016, 01:37:23 pm
content: Hello.Is compatible probes "Probe Master 8043S" with a multimeter "Brymen BM869s"?Interested model with angled connector only.If "yes", how to buy them on Amazon?They cost about 28 USD. Good.But shipping to Russia is crazy money! ((Do as much as maximum cheap shipping, but with track number?Sorry, but English is not my native language. (I use on Google Translate).

author: SkyMaster
author_rank: Frequent Contributor
timestamp: May 15, 2016, 02:43:41 pm
content: Quote from: th704 on May 15, 2016, 01:37:23 pmYou can find the "Probe Master 8043S" on amazon.com:http://www.amazon.com/Probe-Master-8043S-Test-Leads/dp/B000TLXGE2But the Free shipping offer on amazon.com is probably just valid for United States.

author: th704
author_rank: Newbie
timestamp: May 15, 2016, 03:01:39 pm
content: Quote from: SkyMaster on May 15, 2016, 02:43:41 pmI'm talking about this.But the shipping cost is simply astronomical.
UNIPAN 251 DC Nanovoltmeter - Page 1
Forum section: electronics / testgear

author: doktor pyta
author_rank: Frequent Contributor
timestamp: May 14, 2016, 11:21:18 pm
content: Hi,I have the UNIPAN 251 DC nanovoltmeter unfortunately without any schematics and manual.It was made in Poland in the 80's. I was informed that most of the units produced were sold to USSR.The device uses Airpax electromechanical chopper. It is using only semiconductors (no vacuum tubes inside).The design reminds me of Keithley 146 or 147 nanovoltmeter.The device has one problem. On the whole uV range id shows readings that are half they should be.For example I'm applying 100nV and the reading is ca. 50nV.I figure out that the 1 ohm resistor in the nanovolt input feedback net has higher value than it should. The reason for that was old crimped copper to copper connection. When I crimped it harder with my tweezers it hepled but only for few days.So, what would You suggest to solve that. Brand new crimped connection or some other technique?PS. Could an owner of Keithley 146...7 send a picture of the input stage?I'm placing few pictures for those who are interested.

author: Mickle T.
author_rank: Frequent Contributor
timestamp: May 15, 2016, 04:32:57 am
content: Very impressive design. Thank you!

author: TiN
author_rank: Super Contributor
timestamp: May 15, 2016, 05:15:19 am
content: Connections going to uV/nV switch are really corroded. Perhaps remove them, clean them well (maybe etch copper a bit to get shiny fresh metal?) and connect back.Interesting device, thanks for posting.

author: Mickle T.
author_rank: Frequent Contributor
timestamp: May 15, 2016, 06:39:32 am
content: Front panel design, input connector, voltage ranges - all are identical to Keithley 148.

author: doktor pyta
author_rank: Frequent Contributor
timestamp: May 15, 2016, 08:45:47 am
content: Notice the weird 3 -terminal component connected to the uV/mV switch. It is the epoxy potted 1R/1k divider made so to equalize temperatures of resistors and the connection between them ! Additionally it is covered with aluminum sheet.It can be a good point to make DIY nanovolt divider...Oh, what do You think about etching, cleaning, crimping connections and finally covering it with the urethane or Plastik 70 to prevent copper oxidation ??
Agilent DSOX-2000 DIY MSO kit? - Page 1
Forum section: electronics / testgear

author: wedge
author_rank: Contributor
timestamp: May 14, 2016, 02:32:22 pm
content: Hello everybody,I was wondering if someone did a teardown of the MSO prob kit for the 2000 series?I'dl like to know if it's possible to make a DIY board, like guys did for the LAN option.My scope has the software option, but as I have only a dual channel, sometime it's very tricky to use it...Regards!Rémi

author: Hydrawerk
author_rank: Super Contributor
timestamp: May 14, 2016, 03:47:07 pm
content: https://www.eevblog.com/forum/reviews/my-new-toy-)-agilent-dsox2002a-sex-on-a-stick!/msg260744/#msg260744I do not remember who took these photos. Probably I found them on the internet.https://www.eevblog.com/forum/reviews/my-new-toy-)-agilent-dsox2002a-sex-on-a-stick!/125/

author: wedge
author_rank: Contributor
timestamp: May 14, 2016, 11:29:05 pm
content: Thanks!
Rigol DS/MSO4XXX Firmware Version 00.02.03 - Observations - Page 1
Forum section: electronics / testgear

author: dpersuhn
author_rank: Newbie
timestamp: May 14, 2016, 02:47:13 pm
content: After fussing about with direct data transfer between my DG4102 and DS4014. I kept getting failures when trying to pull a waveform from memory and could only get it to transfer them from the screen. This was a real bummer because transfers from the screen are only done at 100 datapoints per division (1400 total), making them somewhat useless for detailed patterns. At any rate, I stumbled across the fact that a new firmware was released on 5/5/2016 for the DS/MSO4000 (about a week ago) and decided to wade off into the abyss and install it. I haven't found any release notes thus far and I downloaded it directly from Rigol's main site (Hey Rigol NA, this is how firmware upgrades are supposed to be offered), rather than requesting it by email.The upgrade went perfectly well from 00.02.02 to 00.02.03 and here are a few initial observations.1. Direct data transfer to my DG4102 now works as expected. I can transfer from ram or from the screen, no more issues and hello to useful waveform replay goodness! Glad to see this fixed2. The size of the frequency counter display has been increased. I like it, but I'm sure there will be folks that don't.3. The user interface and FFT seem a bit more responsive, but this is a completely subjective assessment. I didn't time anything for reference comparison prior to the upgrade.3. The huge one - "Bandwidth 500M" option. Mine shows Official and Never expires. I verified that it is working properly at 500Mhz through. For me, this would seem to lay any question to rest about the 4014 having the same 500MHz front end as the 4054. For the folks that enhanced theirs by tricking it into thinking it is a 4054, it would seem that you now have a definitive answer.If anyone comes across release notes, I'd love to see what else is fixed.Here is a link to the firmware upgrade for anyone else brave enough to try it. Be warned, I haven't put the scope through all the paces yet, so there may be new software defects in this version that remain to be seen. The standard disclaimer applies, your mileage may vary and I would strongly advise against applying this code to a production scope.http://www.rigol.com/Support/SoftDownload/3

author: H.O
author_rank: Frequent Contributor
timestamp: May 14, 2016, 07:22:18 pm
content: Alan posted a link to the releasenotes in "the other" thread. Here it is:http://beyondmeasure.rigoltech.com/acton/attachment/1579/f-05bf/1/-/-/-/-/DS4000%20Firmware%20Release%20Notes.pdf
How is the Spec of m3500 from meco?Should I get it? - Page 1
Forum section: electronics / testgear

author: Raj
author_rank: Frequent Contributor
timestamp: May 13, 2016, 06:36:06 am
content: I could get this meter for about 20$-https://www.ofbusiness.com/product/kusam-meco-m3500b-digital-multimeter/6124465491831430988it looked a bit suspecious to mehttp://www.avinavmarketing.com/pdf/multimeter-%20M3500A.pdf(note the link to store page is showing model B while the pdf shows model A,I could not find the pdf to model B thus raising my suspicion even further)Should I Buy it or not(note: I need robustness and accuracy over portability {I already have 2 handhelds with poor battery backup [meco 801-l,an fluke with display so dim,its in storage})

author: Raj
author_rank: Frequent Contributor
timestamp: May 14, 2016, 05:58:13 pm
content: Never-mind....someone bought itlesson learnt...never post a link to cheap product with limited quantity to a forum.its like announcing it out loud
Rigol DG1032Z - JTAG connectors and pins - Page 1
Forum section: electronics / testgear

author: rodpp
author_rank: Frequent Contributor
timestamp: May 04, 2016, 05:15:11 am
content: Hi,I'm trying to memdump my DG1032Z.There are two 10 pin JTAG headers identified as ARM-JTAG and CPLD-JTAG.And there are test points (without the header) in the PCB identified as JTAG-FPGA.If someone already memdump a DG1032Z and can help me identifying which JTAG to use and the pins identification, I appreciate.Please, see attached three PCB pictures showing the connectors.Thanks in advanced.Regards,Rodrigo.Enviado de meu XT1572 usando Tapatalk

author: rodpp
author_rank: Frequent Contributor
timestamp: May 13, 2016, 12:30:04 pm
content: Up!

author: progfin
author_rank: Newbie
timestamp: May 14, 2016, 10:23:41 am
content: At picture uploadfromtaptalk1462338841970.jpg unable to read the model of the uC.As connector named ARM-JTAG so you can use SEGGER J-link for connecting to chip.near it presents SPI-BOOT connector. device has SPI FRAM/MRAM/EEPROM?What is the reason for reading the dump?Do you wish to upgrade it to DG1062Z with 16M ARB len?Can you do more large photo for reading the model of the ICs? Or put the list of ICs?As I can found photo of pcb:CPU: MCIMX283DVM4B (Freescale) - ARM926EJ-S 454MhzNAND flash: H27U1G8F2BTR-BC (Hynix) - 1 Gbit (128 M x 8 bit)SDRAM: H5PS5162GFR-xxC (Hynix) - 512Mbit (32M x 16 bit)Near the SPI-BOOT connector present 2 chips SOIC-8, one of them with label Winbond, please, give a label of them or photo.About JTAG-pinout try to use next:3v3/Vref - 1 2 - GNDTRST - 3 4 - GNDTDI - 5 6 - SRSTTMS - 7 8 - TDOTCK - 9 10 - Unknown/Not ConnectedBefore connecting check by multimeter pins GND & 3v3/Vref
DP832 series/parallel questions... - Page 1
Forum section: electronics / testgear

author: alank2
author_rank: Super Contributor
timestamp: May 12, 2016, 12:53:49 pm
content: I've got one of those Mastech triple power supplies I've been used to using, but today a DP832 will arrive. Finally I can punch in a voltage without having to adjust that pot up down up down nope still not on the I want up down up down...One thing though is that the Mastech has buttons to select parallel or series and it looks like it actually connects up the terminals properly. If I parallel them, then - terminals will show 0 resistance. If I series them the - of CH1 will be connected to the + of CH2 with 0 resistance.Does the DP832 also do this? Or does it rely upon the user to connect up the terminals for series or parallel?Also, in the app note about the CH2/CH3 where they connect up the negative terminals with a thick wire to deal with current being returned to the wrong one throwing off the voltage, WHY don't they just do this internally? Is there a downside to that?

author: LaurentR
author_rank: Frequent Contributor
timestamp: May 12, 2016, 03:55:13 pm
content: There is no internal switch to do series/parallel on the DP832, so you have to wire it up yourself. There is a section to that effect in the manual called "Power Supply Series and Parallel Connections" which is also available as an appnote (see the attchment on post 1 of the DP832 megathread).https://www.eevblog.com/forum/testgear/rigol-dp832-firmware-updates-and-bug-list/?action=dlattach;attach=79494However, there is a "tracking"mode were you can set Ch1 and Ch2 to track so that you can control both at the same time (see "track function" in the manual).
ANN HpW-Works Version 3.5.0 - Page 1
Forum section: electronics / testgear

author: hpw
author_rank: Frequent Contributor
timestamp: May 16, 2016, 09:55:05 am
content: HpW Works is a software based (audio) signal measurement system for the MS Windows platform.The software analyzes a device under test (DUT) using a sound card, wave files and text (ASCII)files. Various signal analysis are performed such as RMS, DR, THD, THD+N and more. Thelatest version includes Real Time FFT. The built in Wave Generator software supportsvarious signals like, DC, sine, sine & harmonics, multi-sine, noise, jitter test signals, etc.Also, the user can select individual sound card input and output and each with differentsample rate and bit depth. Supported driver formats are MME, WDM, ASIO Synchron I/O,ASIO Multi-Client and WASAPI exclusive mode.The new release includes an improved lookout towards MS Windows 10, seamless operation,several new display options, delivers higher speed and precision measurement.* Test Benches:o FFT 2D (Level Spectrum)o PSP 2D (Power Spectrum)o PSD 2D (Power Density)o FFR 2D (Fast Frequency Response)Detailed specification on the given PDF file or the free Evaluation SW.mailto:support@hpw-works.comhttp://www.hpw-works.com
Tektronix ps280 front panel terminals - Page 1
Forum section: electronics / testgear

author: scottie4442
author_rank: Unknown
timestamp: May 13, 2016, 04:36:11 am
content: I just got a ten ps280 that needs repair. I have the service manual and am working on fixing it. The one problem I have is two of the front panel terminal are broken, can these be replaced? And if so where can I get replacements.

author: tggzzz
author_rank: Super Contributor
timestamp: May 13, 2016, 07:00:29 am
content: Quote from: scottie4442 on May 13, 2016, 04:36:11 amThe service manual will give the part number and replacement procedure.Then use ebay orhttp://www.qservice.tv/http://www.smcelectronics.com/tekpart.htmhttp://www.vernonianorthern.com/TekParts/TekParts.phphttp://www.talonix.com/shop/category.aspx?catid=60and never forgethttps://groups.yahoo.com/neo/groups/TekScopes/info
HP8751A boot failed - Page 1
Forum section: electronics / testgear

author: mrf245
author_rank: Regular Contributor
timestamp: May 12, 2016, 06:22:33 am
content: HelloI have HP8751A worked fine before,now it can't boot up normally.When power-on,I can hearing internal relay sounds"da,da",CH1 led turns on,but display still nothing,and floppy drive no responce(normally,I can see floppy drive LED turns on and hear sound from it).When I open case,dismatle CPU board cover and power-on,I can see main and sub CPU board status LEDs go on,finally they stop in some combination(tomorrow I post my CPU LED status photo here),I wonder if anyone know what's meaning or where I should check(I have no found service manual from google)? Thanks.
My Siglent SDG1025 Repair Experience - Page 1
Forum section: electronics / testgear

author: sanman
author_rank: Contributor
timestamp: May 12, 2016, 02:29:49 pm
content: I recently had a problem with my SDG1025 where the Channel 1 output was low amplitude and distorted. The unit is about a year old and has worked great until this issue.I contacted Siglent via email and received a reply back in 30-minutes, along with an RMA number and shipping information.I shipped the unit on a Thursday and received the unit BACK the following week. All repairs were covered under warranty.The unit is working great once againA big shout out to Siglent for the great support and quick turn-around.

author: rf-loop
author_rank: Super Contributor
timestamp: May 12, 2016, 02:57:10 pm
content: Quote from: sanman on May 12, 2016, 02:29:49 pmPlease can you kindly also tell us where on the earth this happend.

author: sanman
author_rank: Contributor
timestamp: May 12, 2016, 03:09:41 pm
content: ahhhh sorry. I live in Washington, USA and shipped to Siglent in Ohio, USA.

author: BigfootJim
author_rank: Contributor
timestamp: May 12, 2016, 03:22:08 pm
content: I had trouble with the SDG805 I bought not communicating over USB. Contacted Siglent support, spent about a day e-mailing back and forth over drivers (the HW ID did not match anything in their driver), and sent the unit in. They turned around and offered to upgrade me to the SDG1010 at cost and covered the shipping. Probably the easiest & best customer service I've experienced from an MFG in the last 10 years. Except maybe for Samsung replacing the PS in my TV 1.5 years out of warranty due to a design flaw and bad caps.thx-BFJ
Unitrend UT70A teardown - Page 1
Forum section: electronics / testgear

author: Hydrawerk
author_rank: Super Contributor
timestamp: May 11, 2016, 10:01:39 pm
content: Here is finally a teardown of my UNI-T UT70A. Photos were made by me in 01/2010. UT70A was bought in 12/2009. At this time it was one of the few cheap DMMs with L measurement capability. It has many functions for the price.Input protection of the Voltage input is so-so. There are PTCs and probably MOVs, but no spark gap. Back in 2009 I did not care about CAT rating. There are three 250V glass fuses.There is an external fixture for transistor testing.Backlight is quite crap.Theut70a-complete pack.jpgphoto was downloaded fromhttp://arwill.hu/forras/kep/muszerek/multimeterek/ut70a-multimeter-602200-6640.jpg

author: Hydrawerk
author_rank: Super Contributor
timestamp: May 11, 2016, 10:04:15 pm
content: More pics.

author: Hydrawerk
author_rank: Super Contributor
timestamp: May 11, 2016, 10:11:01 pm
content: +There is ayear 2000mark on the case.

author: Hydrawerk
author_rank: Super Contributor
timestamp: May 11, 2016, 10:12:47 pm
content: And some more pictures from internet. Found here.http://www.elektroda.pl/rtvforum/topic2700331.htmlAnd you have probably seen this.https://www.eevblog.com/forum/testgear/uni-t-ut70a-gone-weird/msg255397/#msg255397Well, I am quite satisfied with this DMM.
Yokogawa DL2700 - Page 1
Forum section: electronics / testgear

author: Tektronik
author_rank: Newbie
timestamp: May 10, 2016, 11:10:46 pm
content: HiDoes anyone know something about this oscilloscope ?I prepare to buy this model, but I don't know enough about him...sorry for my english

author: Hydrawerk
author_rank: Super Contributor
timestamp: May 10, 2016, 11:42:24 pm
content: An old scope that was quite good when it was released back in 1997.Here is the service manual.http://elektrotanya.com/yokogawa_sm700820-01e_020_dl2700_oscilloscope.pdf/download.htmlhttp://mysharegadget.com/522320233http://ulozto.net/xjMC3Grj/yokogawa-dl2700-service-manual-pdf

author: pascal_sweden
author_rank: Super Contributor
timestamp: May 11, 2016, 12:23:35 am
content: This scope looks very nice!Would be a cool find in NOS condition

author: Wuerstchenhund
author_rank: Super Contributor
timestamp: May 11, 2016, 05:18:09 am
content: Quote from: Tektronik on May 10, 2016, 11:10:46 pmWell, as already stated it came out in 1997, 150MHz bandwidth, was available with 2, 4, 6 or 8 channels and had a sample rate of 500MSa/s (half-channel) and 200MSa/s (all channels). I think 1M memory was standard, with up to 16M as option. There also was an MSO option.QuoteAny reason you want this particular scope? Unless it's really cheap and/or you need more than 4 channels on a small budget I'm not sure I would buy this scope. These scopes were designed pretty much as long-term multi-channel recorders, and the update rate is generally poor (single digit updates/s). And if something breaks, getting spares is pretty much impossible.

author: nctnico
author_rank: Super Contributor
timestamp: May 11, 2016, 06:28:31 am
content: I wouldn't rule out getting spares. I bought a DL1740 last year and much to my surprise it was very easy to obtain new custom ASIC front end amplifier chips.

author: Fungus
author_rank: Super Contributor
timestamp: May 11, 2016, 06:52:45 am
content: Quote from: Wuerstchenhund on May 11, 2016, 05:18:09 amLet's give it a value: $150 at most (in working condition with all probes, etc.)The photo appears to be from this eBay auction:http://www.ebay.com/itm/262261015873At that price? No way. Definitely not.

author: Wuerstchenhund
author_rank: Super Contributor
timestamp: May 11, 2016, 11:11:35 am
content: Quote from: Fungus on May 11, 2016, 06:52:45 amI don't think $150 is realistic, more like $300 to $500 for a working scope in good condition.QuoteI agree, especially when considering this hasn't really been tested, there is a issue with some buttons and that the LCD screen looks very dim.

author: Muxr
author_rank: Super Contributor
timestamp: May 11, 2016, 06:07:44 pm
content: Those are some decent specs for a 1997 digital scope.

author: Wuerstchenhund
author_rank: Super Contributor
timestamp: May 11, 2016, 07:40:43 pm
content: Quote from: Muxr on May 11, 2016, 06:07:44 pmYes, indeed. The sample rate is a bit low, but the large memory and 32bit MSO was quite unique back then. If I remember right it also comes with decent statistics, large memory FFT and history mode.
Hantek DSO4102B firmware - Page 1
Forum section: electronics / testgear

author: scoper1
author_rank: Newbie
timestamp: May 11, 2016, 12:28:18 pm
content: Does anyone know if there is new firmware for this scope and also a win10 software. Current version is 3.00.2The Hantek website does not list this scope in their downloads folder, so it might be a fake copy ?Can anyone helpThanksJohn
Aim-TTi TF930 owners: can you post an inside pic? - Page 1
Forum section: electronics / testgear

author: mcinque
author_rank: Unknown
timestamp: April 18, 2016, 11:30:24 am
content: Hello,I'm about to purchase a decent frequency counter and the best option for the price (for me) is the Aim-TTi TF930.I've a couple of doubts:1. Internal rechargeable batteries: how easy is to replace that batteries once their life comes to the end?2. The unit comes with schematics and service manual? Or I can just download them?3. Is the unit well engineered inside? There are any bodges inside? I can't find schematics/teardown pics on the web or in the forum.Anyone of you can share his experience about this doubts and share any inside pictures?

author: Smith
author_rank: Frequent Contributor
timestamp: April 18, 2016, 05:41:39 pm
content: I don't have one, but I have used one as I have ordered one for another department. The unit is quite small, and incredibly light. It works quite nice, it is verry is sensitive. It measures mains frequency when nothing is connected.I did miss the option for external in/outputs like a trigger out and 10MHz in and out (except for the 10MHz input on the front. I don't like the 2 inputs with different ranges too. You can measure quite some different settings, but it cannot measure between or compare the two channels.I havent opened it up, so I cannot say anything about the inside.All in all its quite nice for the price.

author: mcinque
author_rank: Unknown
timestamp: April 19, 2016, 06:17:49 am
content: Thank you for sharing this!Maybe some other user knows something also about the inside.

author: jpb
author_rank: Super Contributor
timestamp: April 25, 2016, 07:11:51 pm
content: As requested I've (somewhat gingerly) opened up my TF930 and taken some photos.There isn't much to look at, just two boards and mainly empty space. This doesn't stop it being a good counter - I'm generally pleased with it:Plusses : does continuous counting, computer controlled, a reciprocal counter and up to 10 digits.Minusses : display not backlit, can be slow (doesn't bother me but if you want 10 digits you have to wait 100 secs.

author: jpb
author_rank: Super Contributor
timestamp: April 25, 2016, 07:17:29 pm
content: more pics:For those interested in getting into a TF930 you need to use your fingers (slightly painful on the finger nails!) no tools.Gently lever the front rim off top and bottom and then pull out the four plastic rivets.

author: mcinque
author_rank: Unknown
timestamp: April 25, 2016, 07:25:13 pm
content: Jpb, THANK YOU!!

author: mcinque
author_rank: Unknown
timestamp: May 10, 2016, 11:39:48 am
content: Hi Steve,I follow you videos on YT (and I spot that counter behind you!).We can discuss the price in PM, since I guess this forum area is not for this kind of things
Assortmet of DC barrel connectors for bench power supply? - Page 1
Forum section: electronics / testgear

author: dos
author_rank: Regular Contributor
timestamp: May 10, 2016, 03:45:37 am
content: I'm wondering where I can get an assortment of the most common barrel connectors used on AC adapters in a configuration that's easy to hook up to my bench power supply (connectors with leads already attached?). I work with a lot of small gadgets that are all powered with wall warts and it would be nice to have a selection of these connectors, but all the assortments I find on Amazon seem to be adapters for use with laptops which convert one type to another type, not something designed to wire yourself to a power source. If anyone knows where I can get a kit like this I would really appreciate it!

author: CustomEngineerer
author_rank: Frequent Contributor
timestamp: May 10, 2016, 04:24:28 am
content: I had an extra of something similar to this:http://www.walmart.com/ip/30W-Universal-Wall-Charger-Plug-in-Adapter-with-6-tips/50785468i just cut the wire off of the wall plug and put banana jacks on it. The one I used, the power supply didn't work anymore anyways. It already comes with multiple tips that can be switched out. If I end up needing a tip that I don't already have I usually just buy an individual solderable barrel connector and wire it up by it self.

author: sleemanj
author_rank: Super Contributor
timestamp: May 10, 2016, 06:03:10 am
content: CustomEngineer's solution is probably the best.But you can get tips which take 5.5/2.1 barrel and convert to some other size, (5.5/2.1 is the most common barrel size, hence why it is the "input" of the tip changers), so you can just make up a lead with 5.5/2.1 plug and bananas on the other end.A few examples (no affiliation, just a search)http://www.aliexpress.com/item/Universal-DC-AC-Plug-Charger-Tip-Power-Adapter-Converters-input-5-5mm-2-1mm/32591015389.htmlhttp://www.aliexpress.com/item/5-5-2-1-Portable-10-dc-convertion-connectors-DC-tips-for-universal-adapter-power-charger/32254322600.htmlhttp://www.aliexpress.com/item/1Set-A-Lot-28Pcs-OF-5-5-2-1-Universal-DC-Jack-Power-Supply-Adapter-Connector/32607005823.htmlhttp://www.aliexpress.com/item/Round-1-row-12-seat-laptop-power-supplies-universal-adapter-power-adapter-DC-head/32615423364.html
Build a Clone of the Tek P6602 Temperature Probe - Page 1
Forum section: electronics / testgear

author: med6753
author_rank: Super Contributor
timestamp: May 11, 2016, 04:37:32 am
content: One of the features of the Tek 2465 DMS with the DMM option is the ability to measure temperature using the Tek P6602 Temperature probe. The probe utilizes a thermistor as it's measuring device. A quick search of the web for either the probe itself or a manual has resulted in what I think are ridiculously high prices for either the manual starting at $20 or the probe itself starting at $50. If it's just a thermistor why not build a clone? But the only info I can find on the thermistor is that it should be 100 ohms at 0 degrees C. And it doesn't specify if it's NTC or PTC. But thermistors are sold specifying their resistance at 25 degrees C. So....does someone have a manual or the probe and can tell me the thermistor value at 25 degrees C? That would also tell me if it's NTC or PTC. That would give a starting point to experiment.Thanks.

author: Vgkid
author_rank: Super Contributor
timestamp: May 11, 2016, 07:04:14 am
content: 100 ohms at 0.0c is a pt100 rtd.

author: med6753
author_rank: Super Contributor
timestamp: May 11, 2016, 10:55:25 am
content: Quote from: Vgkid on May 11, 2016, 07:04:14 amIs this what you are referring too?http://www.mouser.com/ds/2/619/M1020_HST-USA-270809.pdf

author: PA0PBZ
author_rank: Super Contributor
timestamp: May 11, 2016, 11:38:59 am
content: If you want to experiment why not hook up a 200 Ohm pot? Turn it so that the 2465 shows 25oC and measure the value.

author: med6753
author_rank: Super Contributor
timestamp: May 11, 2016, 10:25:50 pm
content: Quote from: PA0PBZ on May 11, 2016, 11:38:59 amThat's an excellent idea.I'll give it a try.

author: edavid
author_rank: Super Contributor
timestamp: May 11, 2016, 11:35:53 pm
content: Quote from: Vgkid on May 11, 2016, 07:04:14 amYes, that's what it is... *not* a thermistor.BTW, good luck finding a mating Lemo connector for less than the cost of a complete probe.

author: med6753
author_rank: Super Contributor
timestamp: May 12, 2016, 12:31:38 am
content: Quote from: edavid on May 11, 2016, 11:35:53 pmWhy would I need a Lemo connector? The probe plugs into the DMM input which are standard banana jacks. It does not plug into the powered probe jacks on the scope mainframe.

author: edavid
author_rank: Super Contributor
timestamp: May 12, 2016, 01:18:23 am
content: Quote from: med6753 on May 12, 2016, 12:31:38 amOops, it's the P6601 that has the Lemo.
Teklocity High Voltage Differential Probe - Page 1
Forum section: electronics / testgear

author: jmoreland79
author_rank: Regular Contributor
timestamp: May 09, 2016, 04:34:47 pm
content: We have a Teklocity High Voltage Differential Probe where the power connector has broken off. It still operates on batteries, however they don't last very long and I question the accuracy as the batteries get low.Searching with Google, the company seems to have disappeared. Was it purchase by someone else? I would like to get the unit repaired but don't know where to go.I would try to repair it myself, but the guts of the unit are encased in steel so it would take a lot of bending and prying to get the PCB where the connector was attached.Thanks in advance for any options.

author: Earendil
author_rank: Regular Contributor
timestamp: May 09, 2016, 05:13:06 pm
content: I'm not familiar with Teklocity but this probe looks like to be a Sapphire Instruments SI-9101 (http://www.sapphire.com.tw).They are the OEM and the probe is sold under various names. You can try contacting them, but in my experience they're not very helpful.Edit: Or rather a SI-9010.

author: wraper
author_rank: Unknown
timestamp: May 09, 2016, 05:33:45 pm
content: Quote from: jmoreland79 on May 09, 2016, 04:34:47 pmIf it designed not to be opened, don't expect any repair service. They might offer it, a kind of actually full replacement in which case it is cheaper to just buy another.

author: jmoreland79
author_rank: Regular Contributor
timestamp: May 09, 2016, 07:48:35 pm
content: Quote from: wraper on May 09, 2016, 05:33:45 pmJust thought I'd check that maybe the company got bought buy a larger one, but it does appear to be just a rebadge like the above poster suggested.I think for now I'm just going to get some high quality rechargeable batteries and go that route for now.Thanks for the help.