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The Signal Path
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In this episode Shahriar continues his review of the Tektronix 5-Series 8-Channel MSO Oscilloscope following the original overview of the instrument:
• TSP #102 - Overview of...
A full teardown of the instrument as well as a set of experiments showcasing the new Spectrum View capability are shown. This review is organized as follows:
00:09 - Introduction and outline
01:31 - Teardown and analysis of the acquisition board
13:38 - Experiment setup and description
16:59 - Measurement results and Spectrum View capabilities
33:12 - Concluding remarks
The Signal Path
www.TheSignalPath.com
/ thesignalpath
www.Patreon.com/TheSignalPath

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16 сен 2024

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Комментарии : 106   
@w2aew
@w2aew 5 лет назад
Nice job, Shahriar. A few comments: At about 12m you stated that the memory and sample rate drops when you add all channels. That's not true in this instrument. You retain full sample rate and memory depth on all channels. I like the idea of pluggable mixer modules. Of course, the MSO6 goes to 8GHz and thus could do this measurement without down-conversion. The ADC samples are not interleaved between the analog and RF paths - the same samples are available to both the analog path and DDC path simultaneously - this is why you can get Spectrum View up to the full BW of the scope. At around 22m you commented a few times about not being able to drop the spectrum time exactly where you want it. This only happens when you're using a mouse or touch screen to move the spectrum time. If you use the wave-inspector shuttle-jog control, you can put it anywhere. It's just a little bug in the UI when using the mouse to drag the spectrum time. One more thing that would be VERY interesting to do on this signal would be to double-tap the Frequency measurement badge that you have on, and turn on the Trend trace. Then, you'll see the Frequency vs Time trend of the hop (similar to the FvT trace on the MDO4k). Another handy feature of Spectrum View is that the pinch/pan/zoom all work on the Spectrum View display. Also, the Horizontal position and scale knobs directly control the center frequency and span. Pushing the Position knob will adjust the center frequency to the Reference Marker frequency. Another interesting point about having Spectrum View on multiple channels - you *can* have a different center frequency and a different spectrum time location on each channel - think of the possibilities... As for triggering on RF, MDO capability, etc. - all I can say is that this initial release of Spectrum View is just the tip of the iceberg....
@Thesignalpath
@Thesignalpath 5 лет назад
Thank you for the clarifications! I filmed this before the firmware was released and had no documentation. Why does the sample rate change when I enable the Spectrum View? Is there a way to fix the mouse 'snapping' issue? I was never able to get Spectrum View to show the anything more than 312.5MHz, do you know why?
@w2aew
@w2aew 5 лет назад
@@Thesignalpath In the current implementation, the Span is limited to 312.5MHz for the 5 series, and 1.25GHz for the 6 series. This may change in the future. Similarly, in the current implementation the maximum time-domain sample rate is cut in half when Spectrum View is enabled, but I haven't heard "why" yet... The spectrum time location can be precisely set using the jog-wheel on the front panel, and using the Spectrum Time Position field in the Spectrum Badge. If you click on this field, you can roll the mouse wheel to adjust in 1% increments, and pushing the mouse wheel (3rd button) puts you in "fine" mode where it adjusts in 0.1% increments. Engineering tells me that the 'snapping issue' when dragging by hand will be addressed in the next release.
@Thesignalpath
@Thesignalpath 5 лет назад
@@w2aew Fantastic! Thanks Alan. I'd love to meet sometime again soon. I hope all is well.
@w2aew
@w2aew 5 лет назад
@@Thesignalpath That would be fun!
@misyogi
@misyogi 3 года назад
Last week I used for the first time the Trend trace which based on the measured frequency (automatic function). It is amazing, because the current value of frequency is determined every period of tested signal (!). Hence the trend function can precisely generate the trace of frequency changes. Incredible functionality.
@BHensley
@BHensley 5 лет назад
From many here at Tek... thanks for your review ;)
@danpayerle
@danpayerle 5 лет назад
I think it would be neat to do a video of a Tek product like this with W2AEW. He’s an engineer for Tek and lives in the NJ area. From your livestream last week I think you work at Bell Labs. At the lab in NJ? That would be a really cool crossover video to get some inside knowledge as you do a teardown.
@w2aew
@w2aew 5 лет назад
Dan - Shahriar and I live just a few miles from each other - I hope we can do something together in the future - his lab is truly amazing! (yes, I've been there).
@BruceNitroxpro
@BruceNitroxpro 5 лет назад
@@w2aew, It's a small world... I live in Summit, NJ, near the OLD "Bell Labs," at which my father in law was a Bell Labs Pioneer. My roommate at R.P.I. was hired by Bell Labs. de KQ2E
@w2aew
@w2aew 5 лет назад
@@BruceNitroxpro Hi Bruce - small world! Hope to catch you on the air one day - spend most of my time of 40m when I've got operating time - and lately been focusing on regaining my CW skills. My latest video on my RU-vid channel is a "sending CW basics", discussing straight keys, paddles & keyers, and iambic modes. ru-vid.com
@JWH3
@JWH3 5 лет назад
Great video, really love this kind of content. It's like getting a tour around a strange city, that happens to be a few slabs of silicon :)
@tommihommi1
@tommihommi1 5 лет назад
that's a 13000€ scope. Interesting that Tektronix doesn't do the whole "request quote" thing and just publishes their prices, gotta love some transparency. I never understood the principle of non-public pricing edit: derp, the 13k is the 4 channel version
@IanScottJohnston
@IanScottJohnston 5 лет назад
They want people to enquire.......then at least they have a chance of being talked into buying it whereas they might be scared off without ever having made contact.....my opinion.
@trickyrat483
@trickyrat483 5 лет назад
..4 channel with no options. I'd imagine an 8 channel with the same bandwidth/options as the one in this video is more like £30k (base price alone is £19k with no options for 8 channel.. Gulp! :))
@amciaapple1654
@amciaapple1654 5 лет назад
Yes, I appreciate the price transparency, too. Every time, I have to "get quote", it feels like the price I get depends on my ethnicity/age and employer affiliation. This leaves a lingering impression, that I am being treated unequally, possibly unfairly ...or just scammed.
@kissingfrogs
@kissingfrogs 5 лет назад
@MichaelKingsfordGray If I have to ask then I tend not to. Recent quote for RF gizmo from we;; known vendor ,,, 55K for software options with a base unit cost of 15k
@leppie
@leppie 5 лет назад
That is just the base price for the 4ch 350Mhz version. 8ch fully upgraded, looking at $67k (from www.valuetronics.com/product/mso58-tektronix-mixed-signal-oscilloscope-new)
@mahdimahdavi
@mahdimahdavi 5 лет назад
"There's no such thing as digital circuits anymore of course everything is mixed signal and everything is BEAUTIFUL!" ha ha :))
@shyleshsrinivasan5092
@shyleshsrinivasan5092 5 лет назад
Very grateful for this video ! Well produced !
@danielmelendrez1616
@danielmelendrez1616 5 лет назад
I'm starting to believe that I could live with my right kidney only. I should be fine...🤤
@NickNorton
@NickNorton 5 лет назад
If you believe news. Some Chinese teenager back in 2011 sold a kidney to buy stupid ipad and iphone
@yoramstein
@yoramstein 5 лет назад
@@NickNorton "In GOD we trust".......Mao, US$, Jesus, Karl Marx, Hitler, Apple....They will die for them , They will sell kidney for them, They will kill for them.
@BarriosGroupie
@BarriosGroupie 5 лет назад
Note the classy neutral colour scheme for the front panel compared to most manufacturers going for pinks and purples.
@grhinson
@grhinson 5 лет назад
Momma was an ADC, Daddy was a DAC. I guess you could say I'm a bit mixed up.
@BruceNitroxpro
@BruceNitroxpro 5 лет назад
@MichaelKingsfordGray, OMG... soooooo funny! ROFLMAO
@oriole8789
@oriole8789 5 лет назад
Very cool instrument and analysis. Obscene amount of fast math computation. Thanks for your hard work. Watched at 1.5x haha. Some thoughts: -Product/market differentiation is an obvious business concern in terms of not wanting to enable every conceivable option on every instrument. Tek is very generous as a company, but they have to have a working business model of course. Enabling new firmware features on existing instruments over time, allows a lineup to remain competitive without manufacturing changes. Flexible hardware architecture goes a long way for that when it comes to initial product planning, also giving software/firmware guys more dev time after release. Higher initial costs vs higher long-term returns etc. Yay business things. -I've seen some weird BGA chips before that look like interposers from the top but actually have a die or two on the underside. No bypass caps in your case as you said, so probably not what's going on here. -I've always wondered if there are gov't restrictions for sale/manufacture of products that could function as an extremely wide bandwidth realtime spectrum analyzers, in terms of being used by bad actors to characterize complex radar signatures etc. Kind of like IR cameras being limited to 9fps for US export due to similar concerns of unwanted use. -Realtime wideband capture + multiple receivers for triangulation + "deep" analysis/characterization database + tactical interconnectivity = big current mil. interest for obvious reasons -w2aew's comment talked about frequency vs time trend, it would be interesting to see how "nicely" that's implemented. As a point of interest, one of the scopes I still own is an old 2GHz LeCroy WavePro from 2001, and with enabled options, it can do frequency waterfall display (time vs freq), 64Mpts single waveform capture + 2.5Mpts FFT on any part of captured waveform, which you can scroll/"play back" to see the same frequency hop changes you've shown on the 5-series. It even does vector demodulation with constellation/EVM etc displays. It's ultra awkward and quirky to use and requires high user expertise, and 90MHz cpu running VxWorks is comically underpowered for operating on 64Mpts waveforms haha, but just throwing this out there as a cheap used option if wideband analysis is needed for someone. These days I either use it for radio signal tracking, or for its acq. memory. It's networked, so I export to matlab and run various tools I've built over the years.
@BruceNitroxpro
@BruceNitroxpro 5 лет назад
whatlions, To retrofit a fast computer wouldn't bring it up to date, but would enable some spiffy experiments! Your comments vis-a-vis military uses are enough to make anyone wet their drawers.
@AF6LJSue
@AF6LJSue 5 лет назад
Great video, thank you very much.
@mikeselectricstuff
@mikeselectricstuff 5 лет назад
Maybe the mystery chip is an alternate ADC position for the 4 channel version.
@PlasmaHH
@PlasmaHH 5 лет назад
it doesn't seem to receive any analogue signals though, does it? I think its also a bit too big for just something that handles triggering for that other version of the scope. Is there a version with awg maybe or an mdo variant...
@w2aew
@w2aew 5 лет назад
@@PlasmaHH All of the MSO5 and 6 series have an optional AFG built in.
@edwardhartmann1798
@edwardhartmann1798 5 лет назад
Considering the decoupling layout looks to be the same as the other two it's either that or someone on the design team really wanted a 12 channel version. My guess at the interposer is that it's likely terminating clock lines and the like. Perhaps with embedded resistors.
@djvanzz
@djvanzz 5 лет назад
dream scope
@uwezimmermann5427
@uwezimmermann5427 5 лет назад
at about 25min: some of your features in the FFT must come from the fact that your FFT window contains portions from before and from after the frequency shift. That said your actual switching between the frequencies might be faster that what you read from the transition from clean 150 MHz to clean 200 MHz. Is it possible to zoom into the waveform display once you did the single-shot capture? It would be interesting to see the transition between the two frequencies in the time domain.
@hydron7833
@hydron7833 5 лет назад
Shahriar, if you still have a RTB2004 then you may want to have a play with it's FFT function - they've changed it's operation in a recent firmware release and you can do some of the same tricks as the Tek 5-series (e.g. take the FFT of a movable sub-set of a time domain capture). Like the Tek, moving the FFT window etc can be a bit finicky though. For someone who needs this functionality (on single channel only) it could be a lower priced option. Looking forward to seeing what new toys Tek enable in the future - also would be great if they could send a 6-series to you for a teardown!
@vonnikon
@vonnikon 5 лет назад
Another unusual feature of this scope is that it can decode and trigger(!) on 100Mbit Ethernet. It can trigger on Ethernet frame content. I am however missing two features: * Ability to add custom frame decoding. At the moment it only decodes the Ethernet and TCP/IP headers. * Ability to save many decoded frames and timestamps for analysis.
@rolandklein8260
@rolandklein8260 5 лет назад
This is indeed an interesting feature. The documentation says you can trigger on SFD and the like. Does anybody know how usable it is when analyzing non-standard ethernet frames? Fast Ethernet based real time buses have different frame structures, no or short preamble, and so on. Is triggering and analysis customizable?
@rolandklein8260
@rolandklein8260 5 лет назад
Does anybody know if 100BASE-T1 decoding will be available in the future?
@Starlite4321
@Starlite4321 5 лет назад
Does the addition of "Spectrum View" effectively add the "RF Channel" capabilities from MDO scopes like the MDO4000C to this instrument? Thanks for the excellent videos Shahriar!
@MCSGproject
@MCSGproject 5 лет назад
holy this is a great scope
@microfix6035
@microfix6035 5 лет назад
Very well said
@movax20h
@movax20h 5 лет назад
The middle chip is definitively exactly same chip as other two. All extra components and pads have exactly same placement.
@BruceNitroxpro
@BruceNitroxpro 5 лет назад
movax20h, I'd not rule out a 12 channel version soon. More money buys what more money buys they say.
@Sigmatechnica
@Sigmatechnica 5 лет назад
it might have 8 channels and 2GHz bandwidth, but i still prefer my ancient 7704 :D
@ElectricGears
@ElectricGears 5 лет назад
My first thought for the interposter chip was some kind of wiring matrix to connect the memory with the acquisition chips. The idea would be that if you added more memory you would also swap the interposter with one that interleaved the bits in a different pattern. Like RAID 0 with different strip sizes. A modern version of the classic plugboard. en.wikipedia.org/wiki/Plugboard
@raviteza8
@raviteza8 5 лет назад
Hi, quick question, the analog inputs into the ADC doesn't seem to be length matched? It looks like some are longer than the others. Wouldn't it cause problems in synchronization between channels?
@w2aew
@w2aew 5 лет назад
This is all managed in the calibration of the instrument.
@jeuf37
@jeuf37 5 лет назад
Thanks a lot for the video ! I am so lucky to get this scope at work😀. I'd like to know if there is a way to read the saved wafeworfm in csv or wfm offline with a pc. I know there is an official tool but not sure I can provide arguments to buy it. Does anybody know a tool that could help ?
@leozendo3500
@leozendo3500 5 лет назад
Could the missing chip be a signal generator?
@kulasekaranmuniappan
@kulasekaranmuniappan 5 лет назад
@The Signal Path Isnt Triggering by spectrum cant be done with triggering with rise/falltime?
@w2aew
@w2aew 5 лет назад
Yes, there are a lot of ways to trigger on the RF signal using the various existing trigger methods. The future may bring some more interesting trigger capabilities.
@JWH3
@JWH3 5 лет назад
Is that a PCI(e) slot on that first board in the upper right corner or some kind of custom interconnect for addons?
@kodiak2fitty
@kodiak2fitty 5 лет назад
It wouldn't surprise me if it was a PCIe. It's a great standard and the high end FPGAs can interface to it directly. Even the latest USB is essentially a modified PCIe.
@JWH3
@JWH3 5 лет назад
@@kodiak2fitty I typed the comment too soon, just a couple minutes later he mentioned it was.
@OneBiOzZ
@OneBiOzZ 5 лет назад
Now we play the 1080p waiting game :P
@timlister177
@timlister177 5 лет назад
360p Early Squad Unite!
@ManofCulture
@ManofCulture 5 лет назад
@@timlister177 Unite!
@OneBiOzZ
@OneBiOzZ 5 лет назад
Be sure to send back a situation report
@NiHaoMike64
@NiHaoMike64 5 лет назад
I would like to see a scope with a 4K display. Actually, even 4K is a bit low for a modern high end scope - 4K is barely enough to cover 11 bits of vertical resolution (never mind having multiple channels displayed at once...) and the horizontal depth has far exceeded display capabilities for many years.
@BruceNitroxpro
@BruceNitroxpro 5 лет назад
Alyx, How about a WIDE SCREEN version as well? Most measures are horrible when viewed on the common sized screen sizes, especially when using an FFT display.
@Eagleoneradiogod
@Eagleoneradiogod 5 лет назад
If they maid signal mixers to bring the measured signal into the middle of the bandwidth of the out of band oscilloscope. They would not sell the much higher bandwidth ghz oscilloscopes.
@Thesignalpath
@Thesignalpath 5 лет назад
That is not true. High-BW scopes provide broadband measurement which down-convert mixers would not do.
@Eagleoneradiogod
@Eagleoneradiogod 5 лет назад
@@Thesignalpath did not know that. I would imagine that a broad band mixer is not as accurate as a mixer dedicated to that function. But of course dedicated test equipment costs $$$ .
@stephanc7192
@stephanc7192 5 лет назад
Wow
@gacherumburu9958
@gacherumburu9958 Год назад
👍👍
@jorikvarta81
@jorikvarta81 5 лет назад
Классный аппарат!
@rolandklein8260
@rolandklein8260 5 лет назад
Come on, triggering on the SPI signal that you yourself switch the frequency with... The whole scenario only makes sense if you actually had triggers in the frequency domain. It's sad that this feature is missing, since it should be easy to implement (can't be too hard to look if bin with most power changed).
@Thesignalpath
@Thesignalpath 5 лет назад
Roland Klein Frequency domain triggering will be implemented in the future. Furthermore, I am trying to show the multi-domain capability.
@rolandklein8260
@rolandklein8260 5 лет назад
@@Thesignalpath And I like what you are showing, as always! To me, however, it was disappointing to learn that this feature is missing (for the time being). You are quite an authority in the field, but here I got the impression more of a marketing video instead of a critical review. Never mind, I think it's just because I had found myself building an FPGA based triggering device a while ago that did just that: generating a trigger signal when highest power bin number changed by more than a predefined value within certain amount of time...
@Thesignalpath
@Thesignalpath 5 лет назад
Roland Klein Did you miss the end of the video where I explicitly criticize the instrument for its lack of dedicated trigger input, missing Spectrum View features and that the instrument is most useful in its 8-Channel configuration? Also the annoyance of not having a single probe which supports both digital and analog ports? Heck I tested the instrument using a competing brand synthesizer even dough I have a Tek one in the lab. But I guess it is easy to accuse someone of “marketing” from behind a keyboard.
@rolandklein8260
@rolandklein8260 5 лет назад
@@Thesignalpath You really get me wrong here. No accusation, at least not intended. I said I got the impression. I'm just giving some feedback. With my full name and a foto. Only could do it from behind the keyboard. Wouldn't have thought this could upset you. I know better now, sorry.
@Thesignalpath
@Thesignalpath 5 лет назад
@@rolandklein8260 OK, but you said "I got the impression more of a marketing video instead of a critical review." Whereas I *specifically* called out exactly those shortcomings you brought up in the video along other weaknesses of the instrument. So I don't understand how you can get that impression then. It takes a huge amount of effort to make these videos, it takes time to put together experiments which show both the strength and weakness of an instrument. The whole point of how I produce these videos is that they are not just marketing nonsense. So when someone gets an impression because they did not watch the full video, it gets frustrating. Either way, no hard feelings. I am sorry for getting upset over it.
@Kevin_geekgineering
@Kevin_geekgineering 2 года назад
OMG, where did you get the money? I would be homeless to buy one if these. lets stay with 1Gsa/s, long live china !
@maxsnts
@maxsnts 5 лет назад
God damn what a nice Car! I mean scope!
@busnoise
@busnoise 4 года назад
25:38 LeCroy WavePro can do it as well: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-0A6x1FyG5yY.html
@dtiydr
@dtiydr 5 лет назад
That screen is bigger then my TV..
@fortheregm1249
@fortheregm1249 5 лет назад
You did a Teardown on a *20 GRAND* scope ? jesus christ . The only way thats justified is if you work for tektronix, Please tell me "the signal path" YT channel is ran by tektronix
@Thesignalpath
@Thesignalpath 5 лет назад
You must be new here. :) Here is my teardown of Keysight's $1.3 million dollar scope: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-DXYje2B04xE.html
@tenghuang1815
@tenghuang1815 4 года назад
The real ADC comes from 6.25G*8bit. It is not real 12bit ADC. It combines two 3.125G*8 bit ADC to get 3.125G*12bit ADC. So the ADC bits drop down to 8 bit at 6.25 GSa/s. TEK is a liar and cheater!!!
@w2aew
@w2aew 3 года назад
I'm sorry, but this is not true. The ADC in the 4, 5, and 6 Series is a true 12 bit converter running at up to 25GS/s. In the 4 and 5 series, there is one ADC per four channels, that is why each channel samples at 6.25GS/s max. Memory BW limits are what cause the scope to store 8 bit data at the highest sample rate. However, all signal processing, DSP, spectrum processing, digital down-conversion, etc. is done in the 12 bit realm. There really is nothing lost when storing the 8 bit data because at the highest sample rate, the ENOB is just under 8 bits anyway.
@Thesignalpath
@Thesignalpath 3 года назад
Your comment is filed under “Confidently Wrong”.
@slap_my_hand
@slap_my_hand 5 лет назад
You have too much gear.
@BruceNitroxpro
@BruceNitroxpro 5 лет назад
slap_my_hand, Even God doesn't have too much. LOL
@browaruspierogus2182
@browaruspierogus2182 5 лет назад
This looks like small pc motherboards on one pcb. Why this crap is so expensive I don't know
@Thesignalpath
@Thesignalpath 5 лет назад
Browarus Pierogus Many reasons. Custom ASICS, cost of R&D, software and the many other components I have not shown. Considering what you get, the price is not all too bad.
@browaruspierogus2182
@browaruspierogus2182 5 лет назад
@@Thesignalpath Everything can be 'custom' today because pcb companies are much better and cheaper. What I think is those companies lost their mind and engineers will never get hands on proper equipment unless technology changes and destroys those greedy brands
@Thesignalpath
@Thesignalpath 5 лет назад
I said custom ASICs, not PCB. This is the cost of R&D. Technology has also moved forward tremendously in the past 20 years. The cost performance ratio has gotten better.
@browaruspierogus2182
@browaruspierogus2182 5 лет назад
@@Thesignalpath Today you can design any ASIC and give it to f.ex. TSMC to manufacture. All is so easy and cheap. Those scopes are nothing but ripoffs
@Thesignalpath
@Thesignalpath 5 лет назад
You don’t understand the cost structure of semiconductor design. But that’s OK Dan, it doesn’t make a difference.
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