hybridfree/eevblog-posts huggingface dataset:
Tektronix TDS524A AUX Channels? - Page 1
Forum section: electronics / testgear

author: silviustro
author_rank: Contributor
timestamp: August 17, 2020, 04:51:32 am
content: Hello everyone,Recently I've become the owner of a shining not new quite used oscilloscope. A Tektronix TDS524A.After performing some scrubbing and repairs, I managed to get it somewhat working, It's not all the way there, but it's working well enough to test out most of the functions and get a hang of it.It is quite an nice piece of equipment, but there is something that I still don't understand, What are the AUX channels for?I have read the manual and service manual (https://www.tek.com/oscilloscope/tds520a-manual/tds520a-524a-540a-544a-service-manual) and there is no use case mentioned for them.Enabling the AUX channels disables the main CH1 or CH2, so what's the point of having them if you can't display more than the two main channels at the same time?I had hoped I'd have somewhat of a limited 4 channel scope with the AUX inputs, that would work good enough for slower digital applications like UART, SPI or I2C because of the limitations of the AUX channels.Any Tektronix fans out there know what they're used for? (Or if I'm doing something wrong) Thanks.

author: Rollin Hand
author_rank: Regular Contributor
timestamp: August 17, 2020, 06:49:19 pm
content: The aux inputs are for external sync pulse ,very useful for alignment of professionals vcrs on 1985-1995 years.No too much use today.

author: silviustro
author_rank: Contributor
timestamp: August 17, 2020, 09:36:05 pm
content: Thanks for your answer.But, besides using it for sync, they're able of showing waveforms on screen, albeit, at a lower resolution than the main two channels.The problem is that I cant figure out how to show said waveforms on screen without disabling CH1 or CH2. There is no technical reason as to why it couldn't display all 4 waveforms at the same time. The Oscilloscope has dedicated independent hardware for all of the channels and aux channels.What is true is that the acquisition board only has 2 ASICs, compared to the 4 you'd find on the TDS540.
Keithley DMM6500 SCPI - Run mode and release instrument - Page 1
Forum section: electronics / testgear

author: chrisr
author_rank: Newbie
timestamp: August 16, 2020, 06:42:51 pm
content: Hi there,first off: please excuse any stupidity from my side - as you may see, this is my very first post on this forum.Due to corona lockdown I got myself a treat for my homelab - a Keithley DMM6500.Being lazy, one of the application would be a "Measuretyper". In short this uses a USB connected foot switch and a small application that, when the button is pressed, grabs the current reading of the multimeter and types it into any open application (such as Excel, notepad, etc.).To keep the instrument happily running and user operatable, I used the Control REN to deassert the instrument after reading and therefore put it in local mode again. This worked perfectly fine for Hewlentsight's 34465A and 34401A (both via GPIB and USB) I got at work but for the DMM6500: no love.So the problem comes in two pieces:One is that, once I sent a "READ?"-Query the instrument goes to Remote mode and stops continuous measurements. For each read, another value is sampled but I'd love to have the sampling like "ok, that's the right value, send it over!".I know that the DMM has a extensive triggering system but could not find how to return to this mode (at least in the reference manual).The other thing is that I can't put it back to local mode. In fact I tried all Control REN messages but the DMM seems to ignore it.I'd be delighted if someone could give me a pointer!Setup: DMM6500 connected via USB, VISA is R&S (because NI's is too bulky IMO)Thank you very much in advance!Chris

author: sequoia
author_rank: Unknown
timestamp: August 17, 2020, 01:46:33 am
content: SYST:LOC should work?

author: chrisr
author_rank: Newbie
timestamp: August 17, 2020, 02:32:37 pm
content: Quote from: sequoia on August 17, 2020, 01:46:33 amUnfortunately it doesn't. (I also couldn't find this command in the reference manual)

author: voltsandjolts
author_rank: Unknown
timestamp: August 17, 2020, 03:18:50 pm
content: Search the user manual for 'logout' command

author: chrisr
author_rank: Newbie
timestamp: August 17, 2020, 04:11:15 pm
content: Quote from: voltsandjolts on August 17, 2020, 03:18:50 pmthat's it - thank you!I now also found how to put the DMM back in continuous acquisition: TRIG:CONT REST does the job.The following code does exactly what I want:Code:import pyvisaimport timerm = pyvisa.ResourceManager()dmm = rm.open_resource("USB0::0x05E6::0x6500::xxxxx::INSTR")val = dmm.query("READ?")dmm.write("TRIG:CONT REST")time.sleep(0.001)dmm.query("LOGOUT")print(val)The pause (YMMV) seems to be necessary to avoid a race condition.
Looking for DMM autorange IC for DIY project. - Page 1
Forum section: electronics / testgear

author: satanistik
author_rank: Contributor
timestamp: August 16, 2020, 08:41:58 am
content: I looking for multi meter IC I can use in my DIY retro (nixie tube) multi meter. I need IC that have :- PDF manual available,- autorange,- fast, no delay buzzer,- some RS232 interface,- possible fastest response,- capacitance measure,- market available.I think about DTM0660 - but on RS232 they send display segments no formatted data and they blank display until complete measure.FS9721 look god but its not available.I try to build service (not laboratory) desk DMM - fast response is priority because servicing equipment its not easy to stable connect probe to SMD ICfor long time.

author: coromonadalix
author_rank: Super Contributor
timestamp: August 16, 2020, 12:23:16 pm
content: You have a Digilent dmm shield 5 1/2 digits based on a hycon 3131 aroud 85$ usd, schematics and code availablehttps://store.digilentinc.com/dmm-shield-7-function-digital-multimeter-shield/
Keysight N6705C DC power analyser - Page 1
Forum section: electronics / testgear

author: Sighound36
author_rank: Frequent Contributor
timestamp: August 16, 2020, 10:52:48 am
content: Are there any Keysight N6705C users or owners on EEV Blog forum that could share their experiences with this device please.Also are there any real intrinsic differenices between the previous B model or it is simply a colour change and ROHS compliance.Do the various psu, loads etc fit both units?https://www.keysight.com/en/pd-2747858-pn-N6705C/dc-power-analyzer-modular-600-w-4-slots?nid=-35714.1195294&cc=GB&lc=engCheersSighound

author: TheUnnamedNewbie
author_rank: Super Contributor
timestamp: August 16, 2020, 11:35:23 am
content: We have a few at work, and they seem nice. The modules are all part of the N6700 family, so should be compatible. I think the C should pretty much be a direct-fit replacement for the B, no real differences outside of maybe some internal upgrades internally? Not sure, haven't really used these units a lot myself.
CEM DT-337 in AC/DC current converter mode ­- frequency range? - Page 1
Forum section: electronics / testgear

author: Yuriy V.
author_rank: Contributor
timestamp: August 16, 2020, 09:29:29 am
content: I needed a current probe for oscilloscope (sound amps repairing). Available variants: CC65 probe (Hantek), up to 20 kHz; CEM DT-337 clamps, which has a current converter mode for external measuring instruments (multimeters, oscilloscopes).CEM DT-337 looks interesting due to its potential versatility. But there is no data on their frequency range in this mode. Maybe someone has such information or made measurements? Thanks in advance for your answers (and advice)!
hackable scope choice : Rigol MSO5074 or SDS2000X+ or ? - Page 1
Forum section: electronics / testgear

author: sdouble
author_rank: Frequent Contributor
timestamp: August 15, 2020, 07:26:56 am
content: Hi folks,I am in the need of a couple of scopes in the next months.Only analog stuff. 300 MHz at least. low signal in the mV range most of the time.AWG is needed, basic spectrum analyzer is a plus.I am not fighting to save a few hundreds bucks.What do you guys suggest ?cheers

author: jemangedeslolos
author_rank: Frequent Contributor
timestamp: August 15, 2020, 08:38:08 am
content: Hello,The SDS2000X+ seems to have a much lower frontend noise so it will be a much better choice for your needs.

author: 2N3055
author_rank: Super Contributor
timestamp: August 15, 2020, 09:26:25 am
content: What kind of analog stuff at 300MHz+ in mV range??Maybe you need SA?

author: sdouble
author_rank: Frequent Contributor
timestamp: August 15, 2020, 09:37:21 am
content: I typically look at charge sensitive preamplifier or transimpedance amplifier outputs. typical analog bandwidth is 50-100 MHz. Also usual [20Hz; 20 Mhz] integrated noise is in the 0.5 mV RMS ballpark.I already have reasonnable spectrum analyzers.

author: sdouble
author_rank: Frequent Contributor
timestamp: August 15, 2020, 09:38:14 am
content: Quote from: jemangedeslolos on August 15, 2020, 08:38:08 amthx for the tip. I did not know that.

author: 2N3055
author_rank: Super Contributor
timestamp: August 15, 2020, 09:53:29 am
content: Quote from: sdouble on August 15, 2020, 09:37:21 amThanks.In that case 2000x+ is much better.. it also have 10 bit mode that is 100 MHz limited. Noise is respectably low too.

author: Vestom
author_rank: Regular Contributor
timestamp: August 15, 2020, 02:42:36 pm
content: The SDS2000X+ has a pretty good front-end. Noise is specified to be below 80uV RMS and in 10 bit mode the resolution is down to ~33uV/bit. Even though the sampling rate is only 2GS/s the scope can dither the sample time for a much higher equivalent sample rate making the 500MHz max bandwidth quite usable.Though be aware, that the AWG is a bit basic...I don't regret choosing the Siglent over the Rigol

author: sdouble
author_rank: Frequent Contributor
timestamp: August 15, 2020, 04:31:22 pm
content: Cool, this is really helpful !thxQuote from: Vestom on August 15, 2020, 02:42:36 pm
DP800 vs E36300  - Page 1
Forum section: electronics / testgear

author: drwho9437
author_rank: Regular Contributor
timestamp: August 15, 2020, 03:20:06 am
content: Those who have used both what is the drawback of the Rigol DP800 series vs the Keysight E36300 series. I have never used a DP800.How is the fan noise?I have a Tektronix PS2520G which is fine but loud and only lets me see one supply setting at a time. I have a bunch of other supplies as well.The R&S NGE100B is appealing for the 3 identical channels but I don't love the lack of metal on the barrel jacks and the noise and other specs theoretically are worse than the DP800 which cost less.
ACME programmable load - Page 1
Forum section: electronics / testgear

author: PaulAm
author_rank: Frequent Contributor
timestamp: August 15, 2020, 02:18:52 am
content: I always wanted a piece of ACME branded equipment.Saw this mentioned on the TEA thread, bought it and then the seller canceled because it was scrapped. Somebody else on ebay had one, I offered 50% for it and had it accepted. Given the shipping charged, it's not exactly a score, but a 1KW programmable load for $50 isn't bad. Shipping was expensive, but at least it was well packed.The description said:When it was tested the unit was found to not operate as expected. The unit does not respond to the front panel controls. The unit will not program or apply load. Due to this condition the unit is being sold as is for parts or repair.Figured it was worth a gamble. Got it, plugged it in and turned it on. The fans came up, but nothing else. Well, it is a load, you need to supply something to it. Hooked up a power supply and the Blown Fuse light came on. Jumpered the 150A fuse and everything looks like it works. It will do either constant current or constant resistance and can be programmed via a voltage. Easy enough to add an arduino and a couple op amps to provide digital programming and data logging. And maybe a better display. That meter is one of the hardest to read analog meters I've seen. There are 34 pass transistors in the shunt.A replacement fuse is on the way for $7. This thing will handle up to 110A and 60V with an 80 uSec response for a 100A step. So overall, not bad. I have some battery work coming up where this will be useful.
ARCO SS-32 Precision Standard Capacitors Kit - Value? - Page 1
Forum section: electronics / testgear

author: Acecool
author_rank: Regular Contributor
timestamp: August 16, 2020, 09:59:19 pm
content: I'm curious, what does something like this go for - what would this be worth and if you could complete a set, what would that be worth?I don't really have a use for all of the values I don't think, just a few - but $990 seems a bit high... but what do I know. Do these hold their values over a long time - what type of caps are used, etc... does anyone here know if these caps degrade, what type of caps are used, and the value of this incomplete kit and if it could be completed what the value of that would be? Also, if anyone is interested - feel free to offer. I'm curious on it, and I probably won't be offering anything on this..https://www.ebay.com/itm/ARCO-SS-32-Precision-Standard-Capacitors-Kit-Very-Rare-Unit/124116961975?hash=item1ce5f28ab7:g:BjYAAOSwmWFea-dwAlso, it seems that a full kit of modern high precision capacitors on Amazon go for around $20... so is a kit like this even worth it to use - ie: Are these made of some super long lasting non-degrading capacitor... or are these paper based, or electrolytic, or? Or are these just thin sheets of metal with the proper size to be exactly what it says based on math and density - ie: they won't ever degrade if properly treated... although if the metal is bare, then it could pit, etc... so it would degrade.... But if they are completely airtight and packed in a neutral atmosphere or in a vacuum then it could be they would last forever.... does anyone know the construction on these?I'm curious if this kit is worth it - etc.. What are your thoughts?

author: bob91343
author_rank: Super Contributor
timestamp: August 17, 2020, 04:52:50 am
content: That price is, in my opinion, excessive. But if you are in the mood for a good laugh, try this:https://www.radwell.com/en-US/Buy/ARCO/ARCO/SS-32/Nowhere does anyone mention the tolerance of these capacitors.

author: Acecool
author_rank: Regular Contributor
timestamp: August 20, 2020, 10:28:25 am
content: Yeah, that's always a red-flag...I found another - which is a complete set for $600... Seems excessive especially as these kits are old - no clue on construction... they could be degraded...https://www.ebay.com/itm/133494647306
Advice on picking (another) Bench Oscilloscope... - Page 1
Forum section: electronics / testgear

author: bsodmike
author_rank: Regular Contributor
timestamp: June 30, 2020, 03:08:31 pm
content: Hi all,I have a Tektronix Model TDS 1012 which is a 100MHz/1GS/s 'scope but unfortunately, for the time being, I seem to have misplaced this during a move. So while I continue to check storage for this, I'm looking to pick up another (more modern) scope.My research has me leaning towards the Tektronix MDO34 3-BW-100 - MSO / MDO Oscilloscope, 3 Series, 4 Analogue, 100 MHz, 2.5 GSPS (link:https://export.farnell.com/tektronix/mdo34-3-bw-100/mixed-domain-osc-4-16ch-100mhz/dp/3104068) vs Keysight DSOX3024T (link:https://export.farnell.com/keysight-technologies/dsox3024t/oscilloscope-4-ch-200mhz-5gsps/dp/2449635). Both are 4-channel.For similar cost, the Keysight has more grunt out of the box: 200MHz/5GS/s however, the Tektronix has:100Mhz / 2.5GS/sMuch larger displayHDMI outUpgradable bandwidth / samples/s (at added cost)Digital probe that is very handy as I work a lot more in the MCU domain.Nicer UI, controls. Can even plug a physical mouse to control cursor on screen.I'm actually sold by the touch-sensitive large display.My use-case is mainly microcontroller, power-electronics, switch-mode PSU design related; I'm not entirely sure that I would need the extra bandwidth headroom with the Keysight unit.Thoughts?Thanks!!

author: Fungus
author_rank: Super Contributor
timestamp: June 30, 2020, 03:39:57 pm
content: Quote from: bsodmike on June 30, 2020, 03:08:31 pmYou can get a 350MHz, 8GS/sec Rigol MSO500X with all of that plus a lot more besides for about $1300.(price of 'scope plus digital probe set)

author: nctnico
author_rank: Super Contributor
timestamp: June 30, 2020, 08:21:59 pm
content: I'd say neither. Keysight has short memory and Tektronix' recent scopes don't exactly have a good name where it comes to a snappy user interface. You might want to look at the R&S RTB2004 / RTM3004 or if you are on a budget the Siglent SDS5000 series.

author: bsodmike
author_rank: Regular Contributor
timestamp: July 01, 2020, 12:57:53 pm
content: Hey @nctnico -Thanks for the advice, I'm looking at this RTM3004. It ticks all the right boxes:https://export.farnell.com/rohde-schwarz/rtm3k-24m/digital-osc-mso-200mhz-4-16-ch/dp/2836597It includes a bandwidth upgrade and the 4+16 Digital MSO option (important!).

author: bsodmike
author_rank: Regular Contributor
timestamp: August 14, 2020, 06:51:48 pm
content: Quote from: nctnico on June 30, 2020, 08:21:59 pmQuick thank you for your advise. Both the Keysight PSU and the RTM3004 have been excellent
Siglent SDS2204 "USB Flash Drive isn't connected" - Page 1
Forum section: electronics / testgear

author: survise
author_rank: Newbie
timestamp: August 14, 2020, 04:30:14 pm
content: Hi everyone, hope you are doing good.I wanted to update the firmware on my Siglent SDS2204 DSO (currently at an ancient "Software Version" 1.1.1.37.2) because SPI triggering on MOSI and DECODE just isn't happening.However when I plug in the USB drive and head to the the UPDATE/Firmware menu, after pressing "Single" button to choose the file on the USB, I see a brief message: "USB Flash Drive isn't connected!" I tried restarting with the USB drive inserted, etc.I've tried 5 different USB sticks, most are formatted FAT32.Any idea if there are options to upgrade firmware via LAN or USB-device connection? Or kick start USB?Thanks for your time, and any hints/clues.

author: tautech
author_rank: Super Contributor
timestamp: August 14, 2020, 07:57:33 pm
content: Welcome to the forum.USB flash drive size might be a problem.I only use 8 GB sticks and no problems.Maybe you can partition one to a smaller size IDK......never needed to.

author: survise
author_rank: Newbie
timestamp: August 14, 2020, 09:50:55 pm
content: Thanks!Yeah, I was told by Scott Rocco (of Siglent in USA) to keep it at <=8Gb, and most of my USBs fit that criteria. One is 4GB.When the scope is powered on, the VCC pin of the USB receptacle stays at 0V. Wonder what other similar units have?Are there any schematics floating around for this or similar units? I might brave breaking the seal and peak inside.I found a helpful service manual for SDS1000X, that even lists test points for voltage rails.https://images-na.ssl-images-amazon.com/images/I/B1YjJ%2BOEKhS.pdfNothing available for SDS2000 on either old.siglentamerica.com or siglentna.com(Weird that SDS2000 is not even listed on siglentna.com)

author: tautech
author_rank: Super Contributor
timestamp: August 14, 2020, 09:57:13 pm
content: Do you have a stick with an activity LED ?That should give indication that 5V power is at the socket.They are also designed to power auxiliaries so maybe try a phone charger cable to check if its working.I wouldn't open it up at this time until you prove there is a problem with the USB power.It could just be the 4GB stick so consider partitioning another and give it another try.
2247A Needs Vertical Readout Adjustment - Page 1
Forum section: electronics / testgear

author: Electro Fan
author_rank: Super Contributor
timestamp: August 17, 2020, 03:24:30 am
content: As can be seen in the image below the vertical readout has dropped too low on the 2247A display (the "RUNNING" line should be higher rather than dipping below the display bezel).I haven't been able to find the 2247A documentation yet but I think I found the same basic info for the 2246.Attached is an image showing the procedure for the 2246 which shows the first steps as getting into the service menu from the front panel display. I've done that on the 2247A - easy enough. The instructions then say that it is necessary to align some dashed lines - but I think that might require going inside the scope to adjust R703 and R260. Another of the images shows that these adjustment points can be found on the schematic at 3J and 3M; and that they can be found on the board at 4F and 9H.Unfortunately, I don't have the board layout info for the 2246, much less the 2247A (not sure if they are similar, or not, with respect to the parts and the layout/location).Anyone know if I'm on the right track with interpreting this procedure, and anyone happen to know where on what board these adjustment points might be for the 2247A, and if possible - how to best find/get at them once I take the cover off the 2247A?Thanks!

author: Electro Fan
author_rank: Super Contributor
timestamp: August 17, 2020, 03:50:08 am
content: Ok, some progress. Found the 2247A documentation showing the board location of the R260 and R703.Now just checking to see if I'm on the right track with interpreting this procedure, and if possible - how to best find/get at these two adjustments points after I take the cover off the 2247A?Looks like these 2 adjustments are intended to be made while the unit is AC powered on?Thanks

author: Electro Fan
author_rank: Super Contributor
timestamp: August 17, 2020, 10:24:28 pm
content: weekday bump
Tektronix Rohde & Schwarz CMD-80 - Page 1
Forum section: electronics / testgear

author: rvalente
author_rank: Frequent Contributor
timestamp: August 13, 2020, 05:45:19 pm
content: Hello mates,since CDMA is long dead (at least, here in Brazil) some Tek + R&S CMD-80 communications testers are poping up very cheaply.Would this device be useful as a general purpose spectrum analuzer (maybe with a tracking gen) or is it a very specific device with no other use?Im interested in using this device in HAM frequencies (144 and 440Mhz, basically)

author: Qw3rtzuiop
author_rank: Frequent Contributor
timestamp: August 13, 2020, 06:35:40 pm
content: Just take a look at the datasheet or the manual. It just supports 800/900 MHz and 1800 MHz cellular bands. It doesnt even have a spectrum analysis function.There is just one useful purpose. Tear it down and use the screen or the power supply for your broken SME/SMT/SMP/SMIQ signal generator. They should be compatible.

author: rvalente
author_rank: Frequent Contributor
timestamp: August 13, 2020, 11:35:10 pm
content: Tks by your reply but I do not own any R&S equipment.To be honest, I'm kind of afraid of their stuff. They share little to none service information and spare parts are realy expensive...
Tenma 72-6820 (Instek GOS-6112) Analogue CRO display issue. - Page 1
Forum section: electronics / testgear

author: 60fabfil
author_rank: Newbie
timestamp: August 10, 2020, 05:54:44 am
content: Hi all, can someone help me with this issue? The scope is a Tenma 72-6820 (Instek GOS-6112).Seems when any info display is showing on screen, the trace corrupts (dotty) like an interlacing effect, when the display is removedand only the trace showing, it looks fine.Sort of hard to explain, so I have attached link with Video. Moving the camera side to side highlights the effect.Appreciate the help. thanks.http://www.filedropper.com/tenma72-6820

author: Chris56000
author_rank: Frequent Contributor
timestamp: August 13, 2020, 05:49:57 pm
content: Hi!That looks like clock/timing signals from the readout generator circuitry is getting into the storage and/ortriggering circuitry when the readout circuits are in use, and the first thing I'd be thinking of is faulty supply decoupling!I'll dig out my copy of the GOS6112 diagrams and get back with advice after I've studied them!Chris Williams
Recommendations for isolated variable AC power supply? - Page 1
Forum section: electronics / testgear

author: MRiddickW
author_rank: Contributor
timestamp: August 12, 2020, 08:24:56 pm
content: Hi all, does anyone have a recommendation for an isolated variable AC power supply? I'm working on a project and I may need one soon.Minimum requirements:80 VAC to 280 VAC output2 A at 120 V (I guess)50 Hz and 60 HzLess than $1000. The closer to $500 the betterI have no shame in buying used or off eBay, as long as I can feel reasonably comfortable using it. I checked Rigol and Siglent, but neither of them seem to make AC power supplies.If there's a big jump in quality from say $500 to $700, that may be doable; if all goes well, someone else will buy this for me, but I suspect their budget will top out around $500, so I might could bankroll the rest if it feels worth it.Thanks!

author: eevcandies
author_rank: Regular Contributor
timestamp: August 13, 2020, 03:33:13 am
content: How about a big variac and an isolation transformer?Do you need to create a different freq than the one you have?I have an Elgar EW801 I bought on the bay..very nice, but no isolation (could run it off a big isolation transformer)...you can create about any voltage & any AC freq you want, up to 800 watts. I use it to make a clock spin faster, at 90 Hz

author: rdsi
author_rank: Contributor
timestamp: August 13, 2020, 01:07:02 pm
content: Quote from: eevcandies on August 13, 2020, 03:33:13 amThis is what I do.The box below the variac contains 2 transformers with various taps for my purposes. You can easily mix & match either the variac and/or isolation transformer to get whatever you need for under $500.I put this together like 30 years ago & it still works fine...Needles to say if you're going to be outputting 280 VAC I would give some thought about safety - maybe the newer sheathed bananas!

author: MRiddickW
author_rank: Contributor
timestamp: August 13, 2020, 04:18:52 pm
content: Thanks all, good to know!Quote from: eevcandies on August 13, 2020, 03:33:13 amI'm in the US, so I'm on 120 VAC 60 Hz. The project will need to also work at 240 VAC 50 Hz, but I suppose it's also easy enough to make sure the filter caps are big enough and just not worry about it. That requirement was written with the mindset of "If I'm going to buy a commercial product, I'm going to make sure it does everything I expect to need for this and future projects."Since I need the higher voltages than 120 V, I'll have to make sure something in there is a step-up transformer as well, I suppose.Yeah, the voltages definitely scare me. Not quite tube amp level, but I suspect the difference is not enough to matter all that much.Even more than getting the range of voltages I want, I guess the possibility of current limiting is what really got my mind going about a commercial product. What would you recommend as a fairly straightforward adjustable current limiter? I don't mind getting my hands dirty to get this box together, I just need to avoid my penchant for turning things into a Capital-P-Project.
Fake/Scam ebay auction? - Page 1
Forum section: electronics / testgear

author: Fusion916
author_rank: Regular Contributor
timestamp: August 13, 2020, 05:07:27 am
content: https://www.ebay.com/itm/Keysight-Infiniivision-Dsox3054T/283955456404?hash=item421d106994:g:eyoAAOSwoRRfF59M
R&S RTO1000 upgrade to Windows 10 - Page 1
Forum section: electronics / testgear

author: TRN
author_rank: Unknown
timestamp: August 12, 2020, 06:53:09 pm
content: Does anybody know if it is possible to upgrade an RTO1000 from Win7 to Win10?

author: jjoonathan
author_rank: Frequent Contributor
timestamp: August 13, 2020, 12:54:16 am
content: https://www.eevblog.com/forum/testgear/rohde-schwarz-rto1024-upgrade/
Increase sample rate of Voltech PM300 + other questions - Page 1
Forum section: electronics / testgear

author: petemate
author_rank: Regular Contributor
timestamp: August 12, 2020, 05:04:55 pm
content: Hi, I have a Voltech PM300. During normal front panel operation, the display updates approx once a second. As I understand it from the terrible manual, the display averages a number of readings and updates the display. Makes sense to limit that display update rate, as it is impossible to read an LCD that is updating too fast. But I would like to run at "higer speeds" when I remote control the device. The device apparently samples at 200kHz(there has been some discussion on this in other posts, has something do with the ADCs being only clocked at 50kHz), so it would be nice to be able to measure e.g. 10 or 100 times a second, so that I can quickly obtain data in a sweep and not have to wait 1 second at every time step. However, I can't figure out how to do this, if at all possible.Using the :FRD? command to read data using RS232, I am able to read data at the same speed as the display updates, since this command is synced to the "New data available" status bit. There is a "set averaging" command(:AVG) where you can set a "depth" from 1 to 16 or set it to auto. This just doesn't do anything. I dont know if this is related to the "long averaging" function, which is only available on the PM100. Does anyone know what this do and what the depth actually sets? If I set averaging to "auto", returned values are all zero.Later on in the RS232 interface description, there is an appendix with "configuration commands". An interesting "parameter" called "number of samples"(:CFGmight be of interest. However, this seems reads back to 400 no matter what I do. Also, 400 samples at 50kHz is 8 milliseconds, so that should already be enough. There is no information regarding what this number of samples sets and if it actually does anything. That goes for the majority of parameters listed in this section("Jitter generator" and "sample pre-filter" is mentioned nowhere else).I'd be happy to hear what experience you have with the PM300 and/or PM100. Some options are only available on the PM100 and vise versa. I think that it could be the case for the "number of samples" command, but then it should be listed.Here is a link to the manual for the unit as well as the RS232 interface:https://www.voltech.com/Support/Forum/tabid/151/forumid/6/scope/threads/Default.aspxEdit: Forgot the other question that I wanted to ask: Is it possible to disable display blanking remotely?
HP E1222-62107 Calibration probe - Page 1
Forum section: electronics / testgear

author: IRFP460
author_rank: Contributor
timestamp: January 13, 2019, 09:40:23 am
content: I found a HP E1222-62107 Calibration probe in the dumpster yesterday, but I can't seem to find any data for it.It is active, has a weirdly big ground contact and a sub D connector for power and signal.Do any of you guy know what it is for, what can one calibrate with it?

author: alm
author_rank: Super Contributor
timestamp: January 13, 2019, 03:52:47 pm
content: The HP E1222-62107appears to have been part of the HP 82000 IC Evaluation Systemthat HP introduced in the early nineties. TheHP 82000 getting started manualhas a little information on the use of the calibration probe, and refers to the "Maintaining the HP 82000" manual for which I can't find an online copy for more information about using the calibration probe.I imagine this probe was used for characterizing the cabling and fixture between the IC tester and the device under test (IC). You may be able to find technical details in the HP82000 maintenance and service guides. I'm not sure if it will be useful as a general-purpose probe. The article starting on page 58 ofThe 1989-12 HP Journal issuemay give you some information about how the HP 82000 worked.

author: psubond
author_rank: Contributor
timestamp: August 13, 2020, 02:05:40 pm
content: Do you still have that probe?
JUNTEK PSG9080 programmable signal generator, looking forward to your evaluation - Page 1
Forum section: electronics / testgear

author: Kang le
author_rank: Newbie
timestamp: August 11, 2020, 02:01:34 am
content: If you are interested in watching this module, please contact the email address 3155097720@qq.com，Looking forward to your review video, I will follow you on youtube.JUNTEK YouTube link:https://www.youtube.com/channel/UC2jIo4QgMdVootSBaIZNNlwJUNTEK PSG9080Video link：https://www.youtube.com/watch?v=mBVYoYjNlKo
What to do with a buggy Tektronix 2225 - Page 1
Forum section: electronics / testgear

author: Omega Glory
author_rank: Regular Contributor
timestamp: August 10, 2020, 12:43:05 am
content: I'm a student and while I was looking to get a proper oscilloscope, I ran into this Craigslist post for 4 oscilloscopes for almost nothing, and I took the offer. Two of the scopes ended up having issues (a Tektronix TAS 455, and a Tektronix 2225). The 2225 appears to work in every respect except for the trigger and the trace position knobs were gone. I was wondering what you guys would do with it if you were a broke student. Would you sell it for parts on eBay, or perhaps attempt to make a repair, or maybe use parts of it to build something interesting?

author: snoopy
author_rank: Frequent Contributor
timestamp: August 10, 2020, 01:08:11 am
content: You should be able to get at least one of them going. There is a Tek 2235 repair thread that may help youhttps://www.eevblog.com/forum/testgear/tektronix-2235-repair-thread/

author: bd139
author_rank: Super Contributor
timestamp: August 10, 2020, 09:27:07 am
content: 2225 and 2235 are completely different scopes.2225 is much easier to repair so repair it and use it. It's a very nice scope and mostly made of standard parts. People will help you solve the issues on here. If the knobs are broken off at the shaft then I'd scan ebay etc for an entire front panel or a parts machine to steal them off. If just the knobs are missing you should be able to find some to replace it with.That's 1000x times better than my broke student scope which was a 5MHz single channel job.
'uCurrent' circa 1976 - Page 1
Forum section: electronics / testgear

author: srruhl3701
author_rank: Newbie
timestamp: August 13, 2020, 09:13:46 pm
content: While browsing old electronics magazines, I came across a construction project of a miliamp volt meter accessory. It uses a CMOS op amp, and also can measure current with 1 nA full scale on the 1 volt range of the meter.It is designed for analog meters with 1k Ohms/Volt or greater.https://archive.org/details/197607PopularElectronics/page/n3/mode/2up

author: SilverSolder
author_rank: Super Contributor
timestamp: August 13, 2020, 10:03:55 pm
content: I guess it would need a zeroing pot, if it is not based on a chopper amp?

author: joeqsmith
author_rank: Super Contributor
timestamp: August 14, 2020, 01:30:53 am
content: Are you referring to the "millivolter" that allows a volt meter to read millivolts?

author: srruhl3701
author_rank: Newbie
timestamp: August 14, 2020, 02:01:58 am
content: Yes, it also has selectable shunts to use for reading amps.
StarPoint SP6300 SP6200 TD-SCDMA Analyzers - Page 1
Forum section: electronics / testgear

author: ZL1CVD
author_rank: Regular Contributor
timestamp: July 16, 2020, 12:30:57 am
content: Anyone know about Chinese StarPoint SP6300 or SP6200 TD-SCDMA analysers. I want to know if these are comprised of PXIe chassis and modules.

author: tmbinc
author_rank: Frequent Contributor
timestamp: July 20, 2020, 07:56:13 pm
content: I am very curious as well, as they are relatively cheap. But not cheap enough if there's no indication that they are built from general-purpose test equipment.I wasn't able to find neither software nor a manual or real specifications. The layout of the fans and the power supply doesn't ring a bell, nor does the usage of the HDMI "cascade" ports. Closest is probably PXIe-1095 ref/trigger port, but that seems to be more coincidence than evidence.

author: ZL1CVD
author_rank: Regular Contributor
timestamp: August 10, 2020, 04:13:53 am
content: My Starpoint SP6300 arrived today. I purchased cheapest I could get. Built like a brick out house!! All steel plate case weighs an easy 24 Kg. Big too (50x23x59cm).Inside is a ADLINK PXIS-2670 PXI 14 slot backplane.Controller is ADLINK 3920 (Pentium M 2GHz, 2GB RAM, PCI-3488/348A GPIB, 160GB SATA ).Aeroflex PXI VNA / VSA comprising 1 each:- 3011 Synth OCXO;- 3030A 330~3.3GHz RF Digitizer;- 3060 RF Combiner;- 3010 Synth;- 3020A 250MHz ~ 2.5GHz RF GeneratorThere is also 3x Jungo TMS320C6205 Floating Point DSP PXI which I guess is where all the LTE signal processing occurs.Power supply is EMACS HP2-6500P 500WFired up OK but was password locked. Hacked that and found system running Windows 7 pro. Its not fast but also not as slow as I expected 2GHz Pentium M with 2GB RAM. Probably SATA HDD helps. A SSD would surely speed things up more. 2GB is maximum I think.Given LTE is dead the main use could be RF generation & analyses from 250MHz to 3GHz. As it stands, no physically free slots but if I pull the 3x Junbgo DSPs that will give me 6 slots free as each board had a 1 slot spacer. So would be easy enough to add more NI PXI lab gear - digitizer, multimeter, etc.A bit disappointing as I was hoping for RF gear down to 1MHz and a smaller platform for my bench space. But well worth the $482 I paid to get it here (15% was local tax, actual unit was US$300).A better option is the Aeroflex 7100 which has 2x sets of analyzers that cover from 500kHz to 6GHz but the Aeroflex controller is not a PXI plug in module - its bolted onto the back of the PXI backplane.

author: ZL1CVD
author_rank: Regular Contributor
timestamp: August 10, 2020, 04:15:12 am
content: More images
Tonghui TH2822E / TH2822 software? - Page 1
Forum section: electronics / testgear

author: aronake
author_rank: Frequent Contributor
timestamp: August 09, 2020, 05:51:29 am
content: Hi,There should be PC software for Tonghui TH2822E LCR meter.I cant find it on Tonghui website. Anyone know where to find it or could send a copy? If so let me know and I give you my e-mail.I tried the BK precission LCR software, but that didnt work.

author: HKJ
author_rank: Super Contributor
timestamp: August 09, 2020, 06:53:25 am
content: It uses a virtual serial port and SCPI commands, this means you can make a definition in TestController to control and read values from it.https://www.eevblog.com/forum/testgear/program-that-can-log-from-many-multimeters/

author: Tjuurko
author_rank: Regular Contributor
timestamp: August 10, 2020, 03:39:50 am
content: http://www.tonghui.com.cn/cn/services_download2.htmlTH2822 series USB interface driver download:http://www.tonghui.com.cn/cn/upload/Download/20190917095105961.zipCP210x_VCP_Windows.zip is compatible with TH2822A, C, D, E driver download:http://www.tonghui.com.cn/cn/upload/Download/20190910080533568.zipTH2822 host computer software 3.0.1 download:http://www.tonghui.com.cn/cn/upload/Download/20200518171724482.rar

author: aronake
author_rank: Frequent Contributor
timestamp: August 10, 2020, 04:01:41 am
content: Quote from: Tjuurko on August 10, 2020, 03:39:50 am
HP/Sony opamp IC replacement - Page 1
Forum section: electronics / testgear

author: tinker65
author_rank: Contributor
timestamp: August 08, 2020, 03:15:10 am
content: Anyone can shed some light on this opamp? parts manual says" ic wideband amplifier high slew rate", part number 1813-0299 and manufacturer code 28480 which is HP, however package says Sony BX-002. No luck finding any information about it online so far. I am hoping it can be replaced with a modern counterpart. Thx!

author: shakalnokturn
author_rank: Super Contributor
timestamp: August 09, 2020, 12:13:59 am
content: More context such as what equipment it fits?Very doubtful you'll find more information on the component than that given in the equipment's schematic if available.Is it a hybrid module? If you're sure it's dead you could learn more about it by trying to remove the black potting.

author: tinker65
author_rank: Contributor
timestamp: August 10, 2020, 12:52:59 am
content: It is from HP 4280A CV plotter, I do have full schematics. Yes, looks like some sort of a hybrid module. It is not 100% dead, but gain is around 0.9 while it should be 1. This is messing up readings as reference and measurement channels have different gain now, and difference is way more than calibration pots can compensate for.What in a world could have caused a unity gain buffer OA to develop a gain of 0.9?
Agilent 34410A Programming Manual PDF ? - Page 1
Forum section: electronics / testgear

author: JohnPi
author_rank: Regular Contributor
timestamp: August 08, 2020, 07:13:07 pm
content: Is the programing manual for this DMM - 34410A/34411A available as a .PDF anywhere ? All I can find on Keysight's site is a .CHM file which doesn't open on a Mac or Linux machine.

author: H.O
author_rank: Frequent Contributor
timestamp: August 08, 2020, 08:48:01 pm
content: There is thisQuick Referenceand the User's Guide does cover how to operate each function of the instrument both from the front panel and remotely but if you want I can send you a .pdf "printout" of the complete .chm file just drop me a PM with your e-mail.

author: JDubU
author_rank: Frequent Contributor
timestamp: August 09, 2020, 05:25:47 pm
content: Found this on a manuals download site.Looks like a translation from a .chm file.
Siglent SPD3303X-E not booting - Page 1
Forum section: electronics / testgear

author: eevblog4me
author_rank: Newbie
timestamp: August 07, 2020, 11:57:07 pm
content: I picked up a used Siglent SPD3303X-E power supply from Ebay, which I thought I was getting a reasonable deal on, but it's not booting. On searching, I saw some of the other firmware-related boot issue posts, but they sound slightly different than what I'm seeing. When I power it up, all the buttons light and the display comes up with the Siglent splash, but it only stays lit for a second, then goes dark. It cycles back on about every 3 seconds. At the same time that the display lights up, all the lit buttons flash brighter for just a fraction of a second. I've let it loop like this for several minutes, and it doesn't every seem to go past this state. Anyone have any troubleshooting thoughts? My initial guess would be power, but I haven't cracked it open yet to see what's going on.

author: tautech
author_rank: Super Contributor
timestamp: August 08, 2020, 11:42:39 am
content: Welcome to the forum.I got nothing to help.Will try at the factory for you next week.

author: eevblog4me
author_rank: Newbie
timestamp: August 09, 2020, 05:20:43 am
content: Thanks. I did manage to get it sorted. It's a bit embarrassing, but I'll leave the solution here in case anyone else runs into this down the road. From a close examination of the outside, my power supply appears to have been dropped at some point. With this in mind, I popped the cover and figured I would look around and see if anything was obviously broken, disconnected, etc... While examining the various boards inside, I ended up looking more closely at the AC switches on the back, which were set to 220.Two quick switch flips and I'm up and working.

author: tautech
author_rank: Super Contributor
timestamp: August 09, 2020, 05:45:44 am
content: Quote from: eevblog4me on August 09, 2020, 05:20:43 amNice one ! Yes they come set to 220 VAC ex the factory.....a little trap for you in the US however new, there is a warning tape over the IEC socket reminding to set the correct line voltage.Cool, enjoy.
One more entry range Bode plot capable scope on market - Page 1
Forum section: electronics / testgear

author: rigol52
author_rank: Contributor
timestamp: June 17, 2020, 07:24:27 pm
content: This time from Hantek.Entry model Hantek DPO6082C:US $399.00 + shipping on eBay:https://www.ebay.com/itm/2CH-80MHz-Oscilloscope-64M-Depth-2CH-Signal-Waveform-Generator-2in1-Touch-Screen/283709671734Five in one touchscreen oscilloscope:2 channels oscilloscope+2 channels waveform generator+digital voltmeter+serial protocol analyzer+FFT spectral analysis.DPO6082C★Five in one oscilloscope:2 channels oscilloscope+2 channels waveform generator+digital voltmeter+serial protocol analyzer+FFT spectral analysis.★60 000 wfms/s (dots display)/400,000 wfms/s (dots display quick acquisition mode)waveform capture rate.★Segmented acquisition function,support to capture up to 80,000 sections.256 grade color display.★Up to 16 kinds of trigger functions, including 5 kinds of protocol triggers.Supply 5 serial decoding option.★1 GSa/s real-time sample rate of the analog channels; 64 Mpts standardmemory depth.★2-channel signal source,13 kinds of waveforms inside,4 sets of arbitrary waveforms,200M sample rate,8Kpts waveform length.★1 GSa/s real-time sample rate of the digital channels.★200 MHz, 100 MHz and 80 MHz analog channel bandwidth.★Low base noise, 500uV/div to 10 V/div ultra-wide vertical dynamic range.★7 inch WVGA capacitive touch screen,(800*480) TFT , with ultra-wide screen, vivid picture, lowpower consumption and long service life.★Auto measurement of 42 kinds of waveform parameters (with statistics).★Bode diagram function(the oscilloscopes with signal source function can use).★Multiple waveform math operation functions【MATH】.Event search function.★Standard interfaces: USB Device, USB Host, LAN,Optional interfaces: HDMI ，UART★Conform to LXI CORE 2011 DEVICE class instrument standards; enable quick,economic and efficient creation and reconfiguration of test system.Supports remote command control.Not tested yet (from me) but seriously intend to buy it.Any practical experience with this model?

author: amindavid11
author_rank: Contributor
timestamp: August 07, 2020, 01:11:40 pm
content: Hell, did you buy it and try it out? Would you recommend it? Whats your experience? Thanks
Low jitter lab up to 3GHz and TDS694C - Page 1
Forum section: electronics / testgear

author: tchiwam
author_rank: Regular Contributor
timestamp: August 05, 2020, 09:01:33 am
content: I am trying to build my lab for a low jitter kit <100ps, with a good timebase etc...1st step was a good scope, TDS694C, with all trigger chips working and some space to save the wave form. Found it from ebay.As I am in a remote region, a friend of mine is testing the equipment down south before sending it over.Plugged the output of a AWG2021 to the TDS694CInitial power up was OKWave form was OK, trigger seems to be OKThen warning about the input overheatingsoon after click click sound, screen blinking...Main power switch was turned off at that moment.What could be the next thing to ask my friend to check ?Is the fan working was my 1st guess ?Should I return the unit or try to fix it ? Triggers seem to be all good.Thank you all,

author: snoopy
author_rank: Frequent Contributor
timestamp: August 05, 2020, 09:10:52 am
content: You have inputs switched to 50 ohm and feeding in to high a signal level ??

author: tchiwam
author_rank: Regular Contributor
timestamp: August 05, 2020, 12:18:21 pm
content: The AWG outputs 0 to 5VDC 50 ohm signal maximum and verified.The TDS694C is always 50ohm input
Siglent sds1072cml+ - Page 1
Forum section: electronics / testgear

author: kp
author_rank: Newbie
timestamp: August 04, 2020, 08:56:44 am
content: I am new to the electronics caper, so I hope I have posted in the correct subject. I have bought a Siglent sds1072cml+ together with a Micsig High voltage probe 20003. My thinking was to create a Voltmeter with a difference. The micsig states it needs 100MHz Bandwidth. The Siglent is a 70MHz unit. Is there a way of hacking the Siglent to 150MHz? Am I on the right track?Thanks

author: tautech
author_rank: Super Contributor
timestamp: August 04, 2020, 09:01:14 am
content: Quote from: kp on August 04, 2020, 08:56:44 amWelcome to the forum.QuoteNo.You can use a 500 MHz rated probe on your scope if you wish. The scopes BW doesn't need to match a probe's BW for the probe to be perfectly functional to the full BW of the scope.