Author Topic: Siglent 1104x-e or 2202x-e?  (Read 6234 times)

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Offline Andreax1985

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Siglent 1104x-e or 2202x-e?
« on: January 13, 2019, 03:49:23 pm »
Hi, I'm looking for my first oscilloscope. I've restricted my choice down to two Siglent models: 1104x-e (4ch, 100mhz, 1Gsa/s) and 2202x-e (2ch, 200mhz, 2Gsa/s). In particular I'm wondering if it's worth going for the 2202x-e, trading two channels for higher sampling rate and bandwidth. I'm an hobbist and I mainly work with audio amplifiers and radio transmitters.
What do you suggest?
« Last Edit: January 13, 2019, 04:19:41 pm by Andreax1985 »
 

Offline Fungus

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Offline Andreax1985

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Re: Siglent 1104x-e or 2204x-e?
« Reply #2 on: January 13, 2019, 04:17:17 pm »
https://www.eevblog.com/forum/testgear/unlocking-siglent-sds1104x-e-step-by-step/

Yes, I know I can hack 1104x-e to 200mhz. But:

i) The sample rate will still be 1Gsa/s vs 2 Gsa/s of the 2202x-e. I find 2Gsa/s attractive, but don't know if in practical terms there's a difference.

ii) If you want to be able to use the 200mhz bandwidth with 1104x-e you must also buy four 200mhz probes, so you should factor this in the equation.

iii) How can I be sure that the hack will effectively enable 200mhz bw without possible hidden quirks?
 

Offline Gandalf_Sr

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Re: Siglent 1104x-e or 2202x-e?
« Reply #3 on: January 13, 2019, 04:51:37 pm »
Expand your choices and consider the Rigol DS1054Z, when 'upgraded' it's good for 130 MHz bandwidth.
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Offline Andreax1985

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Re: Siglent 1104x-e or 2202x-e?
« Reply #4 on: January 13, 2019, 04:54:02 pm »
Expand your choices and consider the Rigol DS1054Z, when 'upgraded' it's good for 130 MHz bandwidth.

I've excluded it because it's an older design and it is surpassed by Siglent entry level scopes in almost every way.
 

Offline Gandalf_Sr

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Re: Siglent 1104x-e or 2202x-e?
« Reply #5 on: January 13, 2019, 05:19:45 pm »
That may be true that the Siglent's are more advanced on paper but the DS1054Z is the one I use every day, it works well and for what your needs are, it will do all that you need with the exception that you won't get much past 130 MHz.

I owned a Siglent SDS1202X-E and sent it back then replaced it with the Rigol DS1054Z; for $300 it's an ideal first scope.

Think of it another way, it's been around so long that pretty much all the bugs have been found and fixed.

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Online nctnico

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Re: Siglent 1104x-e or 2202x-e?
« Reply #6 on: January 13, 2019, 05:31:13 pm »
That may be true that the Siglent's are more advanced on paper but the DS1054Z is the one I use every day, it works well and for what your needs are, it will do all that you need with the exception that you won't get much past 130 MHz.

I owned a Siglent SDS1202X-E and sent it back then replaced it with the Rigol DS1054Z; for $300 it's an ideal first scope.
Interesting. I would not expect this. Did you choose the DS1054Z because of more channels or the way it worked in general?

To the OP: I wouldn't spend money on the Siglent SDS2000X. The hardware platform is slow and it has too many limitations because of that.
There are small lies, big lies and then there is what is on the screen of your oscilloscope.
 

Offline Andreax1985

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Re: Siglent 1104x-e or 2202x-e?
« Reply #7 on: January 13, 2019, 05:43:22 pm »
That may be true that the Siglent's are more advanced on paper but the DS1054Z is the one I use every day, it works well and for what your needs are, it will do all that you need with the exception that you won't get much past 130 MHz.

I owned a Siglent SDS1202X-E and sent it back then replaced it with the Rigol DS1054Z; for $300 it's an ideal first scope.
Interesting. I would not expect this. Did you choose the DS1054Z because of more channels or the way it worked in general?

To the OP: I wouldn't spend money on the Siglent SDS2000X. The hardware platform is slow and it has too many limitations because of that.

I'm not looking at the sds2000x series but to the new sds2000x-e which, as far as I understand, shares the same platform with sds1000x-e models, except it has a 2Gsa/s sample rate.
 

Offline Gandalf_Sr

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Re: Siglent 1104x-e or 2202x-e?
« Reply #8 on: January 13, 2019, 05:45:38 pm »
Interesting. I would not expect this. Did you choose the DS1054Z because of more channels or the way it worked in general?

To the OP: I wouldn't spend money on the Siglent SDS2000X. The hardware platform is slow and it has too many limitations because of that.
I was one of the early buyers but had the probe compensation issue which I had to argue with Siglent about to get refunded.  Perhaps like the OP, I'd disregarded the DS1054Z because it had been out 'forever' but when I got it, I was delighted and 4 channels are a huge plus which I have used.

I paid $285 for mine after discounts and they gave me all but the bandwidth upgrade for free.
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Offline Fungus

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Re: Siglent 1104x-e or 2202x-e?
« Reply #9 on: January 13, 2019, 06:04:07 pm »
Expand your choices and consider the Rigol DS1054Z, when 'upgraded' it's good for 130 MHz bandwidth.

Usually closer to 200, measured.
 

Offline MrW0lf

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Re: Siglent 1104x-e or 2204x-e?
« Reply #10 on: January 13, 2019, 06:10:54 pm »
i) The sample rate will still be 1Gsa/s vs 2 Gsa/s of the 2202x-e. I find 2Gsa/s attractive, but don't know if in practical terms there's a difference.

I have SDS2352X-E. For this bandwidth 1GSa/s is on the limit and 2GSa/s pretty good. Real 500uV/ range is also neat thing. For me this is "helper" scope so having 2+EXT not 4 is not a huge issue. If compare to DS1054Z then signal fidelity is another class, what analog frontend sees you see, no tricks - excellent dot mode. So kinda like it.
 

Offline MrW0lf

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Re: Siglent 1104x-e or 2202x-e?
« Reply #11 on: January 13, 2019, 06:13:47 pm »
Usually closer to 200, measured.

More the worse... With 3,4Ch ON 250MSa/s is totally insufficient. With lots of new options on market I would suggest start to avoid "undersamplers".
 

Online nctnico

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Re: Siglent 1104x-e or 2202x-e?
« Reply #12 on: January 13, 2019, 06:15:18 pm »
That may be true that the Siglent's are more advanced on paper but the DS1054Z is the one I use every day, it works well and for what your needs are, it will do all that you need with the exception that you won't get much past 130 MHz.

I owned a Siglent SDS1202X-E and sent it back then replaced it with the Rigol DS1054Z; for $300 it's an ideal first scope.
Interesting. I would not expect this. Did you choose the DS1054Z because of more channels or the way it worked in general?

To the OP: I wouldn't spend money on the Siglent SDS2000X. The hardware platform is slow and it has too many limitations because of that.

I'm not looking at the sds2000x series but to the new sds2000x-e which, as far as I understand, shares the same platform with sds1000x-e models, except it has a 2Gsa/s sample rate.
I'd be wary about the state of the firmware (bugs) of the SDS2000X-E because it was released about a month ago. Also only 2 channels so not very interesting.

Buying the SDS1104x-e (and upgrading it to 200MHz) seems like a safer bet to me but do check the threads about this scope to make sure there aren't any issues you'd like to see addressed first.
There are small lies, big lies and then there is what is on the screen of your oscilloscope.
 

Offline Andreax1985

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Re: Siglent 1104x-e or 2204x-e?
« Reply #13 on: January 13, 2019, 06:20:49 pm »
i) The sample rate will still be 1Gsa/s vs 2 Gsa/s of the 2202x-e. I find 2Gsa/s attractive, but don't know if in practical terms there's a difference.

I have SDS2352X-E. For this bandwidth 1GSa/s is on the limit and 2GSa/s pretty good. Real 500uV/ range is also neat thing. For me this is "helper" scope so having 2+EXT not 4 is not a huge issue. If compare to DS1054Z then signal fidelity is another class, what analog frontend sees you see, no tricks - excellent dot mode. So kinda like it.

I'm looking at the 2Gsa/s 200mhz version (which costs 130 euro more than the 4ch 1Gsa/s 1104x-e). Do you think it's worth it? My doubt is: even if I don't immediately need 4 channels, is it wise to trade 2channels for double the sample rate and bandwidth?

Besides, I see that all the big brands (tek, keysight...) have a lot of 2ch scopes in their catalogues and this makes me think that a buying 2ch scope is not necessarily a wrong move.
 

Online nctnico

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Re: Siglent 1104x-e or 2202x-e?
« Reply #14 on: January 13, 2019, 06:26:30 pm »
Don't get hung up on the samplerate. As long as the samplerate is 2.5 times the maximum frequency you'll be OK. And I strongly recommend getting a 4 channel scope if you are going to design circuits. 2 channels is OK for repair work but for design you'll want to check more signals at the same time.
There are small lies, big lies and then there is what is on the screen of your oscilloscope.
 

Offline Fungus

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Re: Siglent 1104x-e or 2202x-e?
« Reply #15 on: January 13, 2019, 06:29:59 pm »
Usually closer to 200, measured.

More the worse... With 3,4Ch ON 250MSa/s is totally insufficient. With lots of new options on market I would suggest start to avoid "undersamplers".

I believe the hacked Siglents suffer the exact same problem.

Might be best to move up to a Rigol MSO5000, 8GSa/sec is easily enough for 350MHz bandwidth. Avoid the Gibbs phenomenon entirely for not much more money.

Plus you get a built-in signal generator for audio work.
« Last Edit: January 13, 2019, 06:34:13 pm by Fungus »
 

Offline Gandalf_Sr

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Re: Siglent 1104x-e or 2202x-e?
« Reply #16 on: January 13, 2019, 06:30:17 pm »
If you want to look at SPI busses then >2 channels is a must.  If all you're looking at is up to 100 MHz then 1 GSps is OK, even for a 4 channel scope.
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Offline MrW0lf

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Re: Siglent 1104x-e or 2202x-e?
« Reply #17 on: January 13, 2019, 06:34:26 pm »
Don't get hung up on the samplerate. As long as the samplerate is 2.5 times the maximum frequency you'll be OK.

Pretty much any modern digital signal will have max frequency content over let's say 250M and you get annoying wobbly crap on the edges.
 

Offline MrW0lf

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Re: Siglent 1104x-e or 2204x-e?
« Reply #18 on: January 13, 2019, 06:38:34 pm »
I'm looking at the 2Gsa/s 200mhz version (which costs 130 euro more than the 4ch 1Gsa/s 1104x-e). Do you think it's worth it? My doubt is: even if I don't immediately need 4 channels, is it wise to trade 2channels for double the sample rate and bandwidth?

Besides, I see that all the big brands (tek, keysight...) have a lot of 2ch scopes in their catalogues and this makes me think that a buying 2ch scope is not necessarily a wrong move.

What you should take into account that these are MSO (have to buy extra module though). So with all digital channels, EXT and 2 analog will you miss out on something? When you need to measure current and voltage at same time in multiple points then yes. Otherwise you can just make sure that digital line is ok with analog ch and move monitoring it to digital channel.
 

Offline Andreax1985

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Re: Siglent 1104x-e or 2202x-e?
« Reply #19 on: January 13, 2019, 06:39:22 pm »
Usually closer to 200, measured.

More the worse... With 3,4Ch ON 250MSa/s is totally insufficient. With lots of new options on market I would suggest start to avoid "undersamplers".

I believe the hacked Siglents suffer the exact same problem.

Might be best to move up to a Rigol MSO5000, 8GSa/sec is easily enough for 350MHz bandwidth. Avoid the Gibbs phenomenon entirely for not much more money.

Plus you get a built-in signal generator for audio work.

Yes, great specs on paper. But no ERES, no real 500uV/div and zooming under 2mV/div are a deal breaker for me.
 

Online nctnico

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Re: Siglent 1104x-e or 2202x-e?
« Reply #20 on: January 13, 2019, 06:46:27 pm »
Don't get hung up on the samplerate. As long as the samplerate is 2.5 times the maximum frequency you'll be OK.

Pretty much any modern digital signal will have max frequency content over let's say 250M and you get annoying wobbly crap on the edges.
But that is not due to aliasing. The front-end filter and the probe capacitance block the higher frequencies so what is left is a bandwidth limited signal which doesn't show a perfect square wave.
There are small lies, big lies and then there is what is on the screen of your oscilloscope.
 

Offline MrW0lf

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Re: Siglent 1104x-e or 2202x-e?
« Reply #21 on: January 13, 2019, 08:14:35 pm »
Why talk when can do experiment... Here is most mellow square from Arduino using more-less correct probing tech. At 2GSa/s rise is reported as ~4.5ns so edge bw <100MHz.

Below screenshots taken at 2G, 1G, 500M, 200M, 100M sampling rates. What can observe? Signal gets ugly 200MSa/s. At 100MS/a it's fuzzy as hell, but if switch to dot mode can see undistorted signal at full analog bw! Try that on DS1054Z, along with correct (period) measurements on full data out of zoom envelope. ;)
 

Online nctnico

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Re: Siglent 1104x-e or 2202x-e?
« Reply #22 on: January 13, 2019, 08:31:17 pm »
@MrW0lf: Your are showing a different effect here. You are zooming in on a signal without having enough information to display it properly.
« Last Edit: January 13, 2019, 08:43:19 pm by nctnico »
There are small lies, big lies and then there is what is on the screen of your oscilloscope.
 
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Offline Andreax1985

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Re: Siglent 1104x-e or 2202x-e?
« Reply #23 on: January 13, 2019, 08:41:48 pm »
I'd like to know if, in your opinion, 2Gsa/s is overkill for a 200Mhz scope.
 

Online nctnico

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Re: Siglent 1104x-e or 2202x-e?
« Reply #24 on: January 13, 2019, 08:46:04 pm »
I'd like to know if, in your opinion, 2Gsa/s is overkill for a 200Mhz scope.
For 200MHz bandwidth 500Ms/s should be enough if the oscilloscope has a good sin x/x implementation. A higher samplerate would allow for a less steep roll-off of the input filter resulting in a slightly nicer frequency response but it is unlikely you'll have any benefit from it.
There are small lies, big lies and then there is what is on the screen of your oscilloscope.
 

Offline Fungus

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Re: Siglent 1104x-e or 2202x-e?
« Reply #25 on: January 13, 2019, 09:02:31 pm »
I'd like to know if, in your opinion, 2Gsa/s is overkill for a 200Mhz scope.

It depends on the rolloff of analog front end. On a 200MHz 'scope there will probably be visible signal past 500Mhz.
« Last Edit: January 13, 2019, 09:04:58 pm by Fungus »
 

Offline tautech

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Re: Siglent 1104x-e or 2202x-e?
« Reply #26 on: January 13, 2019, 09:05:58 pm »
I'd like to know if, in your opinion, 2Gsa/s is overkill for a 200Mhz scope.
Late to this.....
I would normally recommend the cheaper SDS1202X-E as a first scope but in your case you have enough understanding to want to select a better product.
The SDS2202X-E offer 2x mem depth and 2x sampling, Bode plots and MSO, WiFi plus several other features over it's little 1202X-E brother.
If there's need for 4ch's the 1104X-E will be a better choice and then the feature set is closer but there is still 2 vs 1 GSa/s and 28 Mpts vs 2x 14 Mpts.

The decider for me and I guess you see it too, the SDS1202X-E is WYSIWYG whereas the SDS1104X-E and SDS2**2X-E are base platforms that WiFi, MSO or AWG can be added to if/when needed.

If we examine a usage scenario, 2 channels for SDS1104X-E and 2 ch's for SDS2202X-E, the sample rate will be the same: 1 GSa/s and memory depth equal too.
Either can be hacked and that's when SDS2202X-E will show a distinct advantage with BW @ 350 MHz. (SDS2352X-E)
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Offline Fungus

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Re: Siglent 1104x-e or 2202x-e?
« Reply #27 on: January 13, 2019, 09:09:02 pm »
@MrW0lf: Your are showing a different effect here. You are zooming in on a signal without having enough information to display it properly.

Yes, I'm not sure what he's trying to prove there.

For audio work, even 100Mhz bandwidth is overkill.

Me? I'd turn on the 20Mhz filter if I was working on audio circuits with any of these 'scopes - to get rid of any distracting external noise.
 

Offline MrW0lf

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Re: Siglent 1104x-e or 2202x-e?
« Reply #28 on: January 13, 2019, 09:10:10 pm »
For 200MHz bandwidth 500Ms/s should be enough if the oscilloscope has a good sin x/x implementation. A higher samplerate would allow for a less steep roll-off of the input filter resulting in a slightly nicer frequency response but it is unlikely you'll have any benefit from it.

Theoretically perhaps in practice difference quite stark. Here I simulate 200MHz scope by enabling 200MHz HW LowPass and feeding square from 6GHz gen. At 500MSa/s pretty messy despite decent Sin(x)/x. 1G vs 2G difference mainly in timing resolution. So as rule of thumb I would say that for 100MHz scope you need 500MSa/s and for 200MHz scope 1GSa/s for "analog scope like" experience. Above that you will gain mainly timing resolution (which can be important sometimes).
 

Offline MrW0lf

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Re: Siglent 1104x-e or 2202x-e?
« Reply #29 on: January 13, 2019, 09:14:26 pm »
Yes, I'm not sure what he's trying to prove there.

I'm showing real world scenarios instead of dry theory, including importance of proper dot mode which will show analog like representation even if situation is totally hopeless for Sin(x)/x. But I understand this is new concept for you because your scope cant do it. ;)

Edit: Attached same 200MHz edge square sampled at "hopeless" 200MSa/s due to maxed out memory at 10ms/. Dot mode saves situation and gives visual that scope having ~10x of memory would deliver (repetitive signals only).
« Last Edit: January 13, 2019, 09:37:56 pm by MrW0lf »
 

Offline sn4k3

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Re: Siglent 1104x-e or 2204x-e?
« Reply #30 on: January 13, 2019, 09:43:21 pm »
Yes, I know I can hack 1104x-e to 200mhz. But:

i) The sample rate will still be 1Gsa/s vs 2 Gsa/s of the 2202x-e. I find 2Gsa/s attractive, but don't know if in practical terms there's a difference.

ii) If you want to be able to use the 200mhz bandwidth with 1104x-e you must also buy four 200mhz probes, so you should factor this in the equation.

iii) How can I be sure that the hack will effectively enable 200mhz bw without possible hidden quirks?

ii) Stock probes are 200mhz capable, i can confirm that, i have sds1104x-e with 200mhz.

Also: https://www.eevblog.com/forum/buysellwanted/fs-(uk)-siglent-sds1104x-e/msg2079202/#msg2079202



I took that great deal with all unlocked and options.

4 channel scopes are becoming for usefull than other features on most cases
« Last Edit: January 13, 2019, 09:48:28 pm by sn4k3 »
 

Offline Andreax1985

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Re: Siglent 1104x-e or 2202x-e?
« Reply #31 on: January 13, 2019, 10:40:26 pm »
Another feature of SDS2000X-E series is 50ohm input termination... do you think it is a valuable addition to the scope?
 

Offline tautech

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Re: Siglent 1104x-e or 2202x-e?
« Reply #32 on: January 13, 2019, 11:13:15 pm »
Another feature of SDS2000X-E series is 50ohm input termination... do you think it is a valuable addition to the scope?
It is and it's nice to have it inbuilt but for the inexperienced or inattentive operator it has the vulnerability of being damaged with too much input. Just something to be wary of.  ;) 
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Offline rf-loop

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Re: Siglent 1104x-e or 2202x-e?
« Reply #33 on: January 14, 2019, 06:10:58 am »
Yes, I'm not sure what he's trying to prove there.

I'm showing real world scenarios instead of dry theory, including importance of proper dot mode which will show analog like representation even if situation is totally hopeless for Sin(x)/x. But I understand this is new concept for you because your scope cant do it. ;)

Edit: Attached same 200MHz edge square sampled at "hopeless" 200MSa/s due to maxed out memory at 10ms/. Dot mode saves situation and gives visual that scope having ~10x of memory would deliver (repetitive signals only).

This is normal with Siglent's SARI.

Thanks god Siglent display modes - interpolations are fully post processed. Also in stop mode and in history buffer or segment buffer user can afterwards full freedom to select interpolation method or just real dots. It never flush out real ADC based samples.

Here is a rather extreme example of how  Siglent's well known  Sequential Acquisitions Random Interleaving - SARI works.

This is somehow like LeCroy's "Random Interleaved Sampling Mode - RIS" cousin. (do not still mix, they are still very different)

Here some old images (I do not translate here full text with these images) Sorry bit low gamma in images.


Original signal with 500MSa/s


Sample interval 20ns
fNyg 25MHz and signal 45MHz what also have lot of higher freq components (harmonics). Just totally hopeless - of course.

But then we have opportunity - SARI. Just turn off all interpolations, just true dots alone. Sequential acquisitions are still horizontally adjusted right related to trigger time position and -  here in next image is result, is our original signal.  Trigger engine works well and use "oversampling" and interpolation between decimated samples for adjust position. (of course if full sample rate then it do normal oversampling-fine interpolation between true samples as all modern scopes with full digital trigger engine do)


Sample interval 20ns.

Of course in this very extreme case there is not anymore enough dots (due to sampling interval and wfm/s*)  for draw continuous line but here persistence helps.
*One TFT frame do not include so many sequential acquisitions overlaid due to window zoom and main window time base. With more fast wfm/s rates of course dots density is much more high.

Of course SARI have also its limits and then more importantly, signal need be enough repetitive.
Do not mix this with some oscilloscopes ETS mode. SARI is not conventional DSO's ETS.
« Last Edit: January 14, 2019, 06:46:17 am by rf-loop »
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Offline Fungus

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Re: Siglent 1104x-e or 2202x-e?
« Reply #34 on: January 14, 2019, 08:32:33 am »
Sigh. If only those cheap Rigols could have a dots mode:

Oh, wait a minute, they do...


 

Offline MrW0lf

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Re: Siglent 1104x-e or 2202x-e?
« Reply #35 on: January 14, 2019, 08:58:20 am »
Oh, wait a minute, they do...

Nope, compare that to 1GSa/s trace and notice they are different eg it still somehow interpolated crap just drawn in different manner, or perhaps trigger system acting up. On Siglent 2GSa/s trace and even 100MSa/s trace are exactly of same shape eg there is no interpolation and trigger is rock solid. In fact this wast found out long ago:
https://www.eevblog.com/forum/testgear/new-rigol-ds1054z-oscilloscope/msg1821113/#msg1821113
« Last Edit: January 14, 2019, 09:03:35 am by MrW0lf »
 

Offline rf-loop

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Re: Siglent 1104x-e or 2202x-e?
« Reply #36 on: January 14, 2019, 09:24:27 am »
Sigh. If only those cheap Rigols could have a dots mode:

Oh, wait a minute, they do...



And now run it so that input is nearly 2x fNyquist frequency square wave first harmonic and risetime around 1/5 of sampling interval (rt4ns @50MSa/s). I think you missed whole point totally.  In your image signal rising edge have around 2 samples. I do not know any single scope what can not do and reconstruct it (just turn Sinc on and your Riglol display very nearly same what you show with your dots+persistence. Rigol can not do at all what I show previously.
But yes, now we know it can also display dots. But it can not do at all what I show previously what is very different thing.
(btw, can  you show stopped scope same signal and dots image and then exactly same acquisition data then turn Sinc on display mode lines ... and also change Sinc off and lines... .. fun - is it)
If practice and theory is not equal it tells that used application of theory is wrong or the theory itself is wrong.
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Offline Gandalf_Sr

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Re: Siglent 1104x-e or 2202x-e?
« Reply #37 on: January 14, 2019, 10:10:53 am »
Andreaux, as you can see there's LOT of opinions on which company does the best job taking ADC samples and displaying them and you  can quickly get lost in Nyquist theorum arguments etc.  The simple fact is that, for what your stated needs are, the DS1054Z does 99.5% of what you want to do and the UI is pretty good IMHO; if you want to pay more go ahead because, unless you get a bad one, they will all do what you want.

Also be aware that Tautech is a Siglent agent (it says so under his name).
If at first you don't succeed, get a bigger hammer
 

Offline Fungus

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Re: Siglent 1104x-e or 2202x-e?
« Reply #38 on: January 14, 2019, 10:14:51 am »
And now run it so that input is nearly 2x fNyquist frequency square wave first harmonic and risetime around 1/5 of sampling interval (rt4ns @50MSa/s).

Like this?

 

Offline tautech

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Re: Siglent 1104x-e or 2202x-e?
« Reply #39 on: January 14, 2019, 10:23:59 am »
Also be aware that Tautech is a Siglent agent (it says so under his name).
And you sound like that's a bad thing ?  :-//
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Offline rf-loop

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Re: Siglent 1104x-e or 2202x-e?
« Reply #40 on: January 14, 2019, 10:31:45 am »
And now run it so that input is nearly 2x fNyquist frequency square wave first harmonic and risetime around 1/5 of sampling interval (rt4ns @50MSa/s).

Like this?



Is this signal same as your previous message. If it is same signal, explain this previous image "sample fake dot" just after rising. (overshoot)
Then perhaps you did not understand what is 1/5...  Also I know why you want jump over other things what I ask...

I think this is waste of time. Years ago I try explain milk color to born blind people and soon I find it is least difficult of not even impossible until I fgind it is not even nessessary. After many times here in forum I feel bit same...
If practice and theory is not equal it tells that used application of theory is wrong or the theory itself is wrong.
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Offline Fungus

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Re: Siglent 1104x-e or 2202x-e?
« Reply #41 on: January 14, 2019, 11:07:11 am »
Is this signal same as your previous message.
No, it was produced by user "TurboTom" using a real pulse generator (the previous was just me looking at an Arduino output pin)

I thought you'd already know this. In the original thread it's on the exact same same page as the images you (re)posted yesterday.

Here: https://www.eevblog.com/forum/testgear/new-rigol-ds1054z-oscilloscope/msg1818110/#msg1818110

 

Offline Andreax1985

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Re: Siglent 1104x-e or 2202x-e?
« Reply #42 on: January 14, 2019, 11:29:00 am »
Andreaux, as you can see there's LOT of opinions on which company does the best job taking ADC samples and displaying them and you  can quickly get lost in Nyquist theorum arguments etc.  The simple fact is that, for what your stated needs are, the DS1054Z does 99.5% of what you want to do and the UI is pretty good IMHO; if you want to pay more go ahead because, unless you get a bad one, they will all do what you want.

Also be aware that Tautech is a Siglent agent (it says so under his name).

Is there any particular reason why I should go for the rigol DS1054Z (hackable to 100Mhz) in place of siglent 1104x-e (hackable to 200Mhz), apart from 100$ difference?
« Last Edit: January 14, 2019, 11:32:53 am by Andreax1985 »
 

Offline Andreax1985

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Re: Siglent 1104x-e or 2202x-e?
« Reply #43 on: January 14, 2019, 11:30:41 am »
I'd like to know if, in your opinion, 2Gsa/s is overkill for a 200Mhz scope.
Late to this.....
I would normally recommend the cheaper SDS1202X-E as a first scope but in your case you have enough understanding to want to select a better product.
The SDS2202X-E offer 2x mem depth and 2x sampling, Bode plots and MSO, WiFi plus several other features over it's little 1202X-E brother.
If there's need for 4ch's the 1104X-E will be a better choice and then the feature set is closer but there is still 2 vs 1 GSa/s and 28 Mpts vs 2x 14 Mpts.

The decider for me and I guess you see it too, the SDS1202X-E is WYSIWYG whereas the SDS1104X-E and SDS2**2X-E are base platforms that WiFi, MSO or AWG can be added to if/when needed.

If we examine a usage scenario, 2 channels for SDS1104X-E and 2 ch's for SDS2202X-E, the sample rate will be the same: 1 GSa/s and memory depth equal too.
Either can be hacked and that's when SDS2202X-E will show a distinct advantage with BW @ 350 MHz. (SDS2352X-E)

I've never read anywhere that SDS2202X-E is hackable to 350Mhz. Are you sure?
« Last Edit: January 14, 2019, 11:33:08 am by Andreax1985 »
 

Offline tautech

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Re: Siglent 1104x-e or 2202x-e?
« Reply #44 on: January 14, 2019, 11:36:25 am »
I'd like to know if, in your opinion, 2Gsa/s is overkill for a 200Mhz scope.
Late to this.....
I would normally recommend the cheaper SDS1202X-E as a first scope but in your case you have enough understanding to want to select a better product.
The SDS2202X-E offer 2x mem depth and 2x sampling, Bode plots and MSO, WiFi plus several other features over it's little 1202X-E brother.
If there's need for 4ch's the 1104X-E will be a better choice and then the feature set is closer but there is still 2 vs 1 GSa/s and 28 Mpts vs 2x 14 Mpts.

The decider for me and I guess you see it too, the SDS1202X-E is WYSIWYG whereas the SDS1104X-E and SDS2**2X-E are base platforms that WiFi, MSO or AWG can be added to if/when needed.

If we examine a usage scenario, 2 channels for SDS1104X-E and 2 ch's for SDS2202X-E, the sample rate will be the same: 1 GSa/s and memory depth equal too.
Either can be hacked and that's when SDS2202X-E will show a distinct advantage with BW @ 350 MHz. (SDS2352X-E)

I've never read anywhere that SDS2202X-E is hackable to 350Mhz. Are you sure?
Unproven as yet......but this guy is quite sure it can be done:
https://www.eevblog.com/forum/testgear/siglent-sds2000x-e/msg2018767/#msg2018767
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Offline Fungus

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Re: Siglent 1104x-e or 2202x-e?
« Reply #45 on: January 14, 2019, 11:47:02 am »
Is there any particular reason why I should go for the rigol DS1054Z (hackable to 100mhz) in place of siglent 1104x-e (hackable to 200mhz), apart from 100$ difference?

I think it's more than $100  ;), but.... you haven't mentioned a strict budget and for your stated work there's some reasons you might want to:
a) Better FFT
b) Lower front-end noise in the millivolt ranges
c) Possibility to link it to a signal generator (Siglent brand only, of course) and do frequency sweeps/Bode plots

All the talk about sample rate, etc., is a red herring but as usual the Siglent fan club has derailed the thread with a Rigol-Bashing frenzy and without reading your requirements.

Relevant:
* For audio work you should turn on the 20MHz filter and get rid of all the distracting radio noise from your surroundings that will distract you from real problems in the circuitry.

* For radio work you're interested in sine waves so discussion of rise times is pointless. With the bandwidth of either device you'll have more problems just getting the signal to the 'scope intact.

 

Offline Andreax1985

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Re: Siglent 1104x-e or 2202x-e?
« Reply #46 on: January 14, 2019, 11:52:02 am »

I think it's more than $100  ;), but.... you haven't mentioned a strict budget and for your stated work there's some reasons you might want to:
a) Better FFT
b) Lower front-end noise in the millivolt ranges
c) Possibility to link it to a signal generator (Siglent brand only, of course) and do frequency sweeps/Bode plots

All the talk about sample rate, etc., is a red herring but as usual the Siglent fan club has derailed the thread with a Rigol-Bashing frenzy and without reading your requirements.

Relevant:
* For audio work you should turn on the 20MHz filter and get rid of all the distracting radio noise from your surroundings that will distract you from real problems in the circuitry.

* For radio work you're interested in sine waves so discussion of rise times is pointless. With the bandwidth of either device you'll have more problems just getting the signal to the 'scope intact.

how about the 50ohm input in the 2202x-e? do you see it as a big plus?
 

Offline tautech

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Re: Siglent 1104x-e or 2202x-e?
« Reply #47 on: January 14, 2019, 11:53:59 am »

c) Possibility to link it to a signal generator (Siglent brand only, of course) and do frequency sweeps/Bode plots

::)
You really need to get up with the play:
https://www.eevblog.com/forum/testgear/siglent-sds1104x-e-and-sds1204x-e-bode-plot-with-non-siglent-awg/
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Offline Gandalf_Sr

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Re: Siglent 1104x-e or 2202x-e?
« Reply #48 on: January 14, 2019, 12:12:18 pm »
Andreaux, as you can see there's LOT of opinions on which company does the best job taking ADC samples and displaying them and you  can quickly get lost in Nyquist theorum arguments etc.  The simple fact is that, for what your stated needs are, the DS1054Z does 99.5% of what you want to do and the UI is pretty good IMHO; if you want to pay more go ahead because, unless you get a bad one, they will all do what you want.

Also be aware that Tautech is a Siglent agent (it says so under his name).

Is there any particular reason why I should go for the rigol DS1054Z (hackable to 100Mhz) in place of siglent 1104x-e (hackable to 200Mhz), apart from 100$ difference?
I don't know if there is a hardware difference between an official DS1054Z and a DS1104Z.

If you Google "Riglol" (not a typo) you will find a site (first hit for me) where you can enter the serial number and generate the code to unlock a DS1054Z up to a DS1104Z using option DSFR  (it will then report itself as a DS1104Z). Mine is flat to 130 MHz after this 'upgrade'. Some people claim it goes to 200 MHz (the probes I got were 200) but I found that, while I could see 200 MHz waveforms, the Y amplitude was falling - again, for what you say you want to use it for, it's all that you need.
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Offline Gandalf_Sr

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Re: Siglent 1104x-e or 2202x-e?
« Reply #49 on: January 14, 2019, 12:18:13 pm »
Also be aware that Tautech is a Siglent agent (it says so under his name).
And you sound like that's a bad thing ?  :-//
You're being a bit touchy - I just wanted to make Andreaux aware of your allegiance
If at first you don't succeed, get a bigger hammer
 

Offline Andreax1985

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Re: Siglent 1104x-e or 2202x-e?
« Reply #50 on: January 14, 2019, 12:20:32 pm »
Another point in favor of 2202x-e seems to be bandwidth flatness, which is as follows:

DC - 60% (BW): ± 1 dB
60% - 100% (BW): + 1 dB/-3 dB

whereas for 1104x-e bw flatness is

DC- 10% (BW): ± 1 dB
10%- 50% (BW): ± 2 dB
50%- 100% (BW): + 2 dB/-3 dB

It seems that, for the 1104x-e, only 10% of  the bandwidth is attenuated less than 1db. Am I correct? Is this important?

 

Offline tautech

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Re: Siglent 1104x-e or 2202x-e?
« Reply #51 on: January 14, 2019, 12:21:57 pm »
Also be aware that Tautech is a Siglent agent (it says so under his name).
And you sound like that's a bad thing ?  :-//
You're being a bit touchy - I just wanted to make Andreaux aware of your allegiance
Really ? I'm sure he's not blind or dumb.
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Offline Gandalf_Sr

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Re: Siglent 1104x-e or 2202x-e?
« Reply #52 on: January 14, 2019, 12:24:51 pm »
I'm sorry, I'm not allowed to argue with you until you pay.
If at first you don't succeed, get a bigger hammer
 

Offline Andreax1985

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Re: Siglent 1104x-e or 2202x-e?
« Reply #53 on: January 14, 2019, 12:29:02 pm »
Ok guys...I perfectly know that tautech is Siglent reseller. I think I knew it from the first days of me lurking on this website:D however I value his opinion as well as other member's. Now please, let's not derail the thread further :)
 
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Offline tautech

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Re: Siglent 1104x-e or 2202x-e?
« Reply #54 on: January 14, 2019, 12:35:06 pm »
Another point in favor of 2202x-e seems to be bandwidth flatness, which is as follows:

DC - 60% (BW): ± 1 dB
60% - 100% (BW): + 1 dB/-3 dB

whereas for 1104x-e bw flatness is

DC- 10% (BW): ± 1 dB
10%- 50% (BW): ± 2 dB
50%- 100% (BW): + 2 dB/-3 dB

It seems that, for the 1104x-e, only 10% of  the bandwidth is attenuated less than 1db. Am I correct? Is this important?
Little.......if you also consider the industry standard amplitude accuracy spec of +3%.
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Online nctnico

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Re: Siglent 1104x-e or 2202x-e?
« Reply #55 on: January 14, 2019, 12:48:59 pm »
I wouldn't call 3% industry standard. On the low end oscilloscopes perhaps but on the A brands you'll often find numbers between 1% and 2%. BTW 3% is in the 0.25dB ballpark.
There are small lies, big lies and then there is what is on the screen of your oscilloscope.
 

Offline Performa01

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Re: Siglent 1104x-e or 2202x-e?
« Reply #56 on: January 14, 2019, 02:19:39 pm »
It seems that, for the 1104x-e, only 10% of  the bandwidth is attenuated less than 1db. Am I correct? Is this important?
Of course bandwidth flatness isn't exactly the same for each individual vertical gain setting - but other than some cheap designs, it's still fairly consistent for the SDS1000X-E series:

1dB bandwidth at least 74MHz for the 100MHz version.
1dB bandwidth at least 192MHz for the 200MHz version.

See attached tables for the exact 1, 3 and 6dB measurements.
 

Offline Fungus

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Re: Siglent 1104x-e or 2202x-e?
« Reply #57 on: January 14, 2019, 02:28:51 pm »

c) Possibility to link it to a signal generator (Siglent brand only, of course) and do frequency sweeps/Bode plots

::)
You really need to get up with the play:

Excuse me for not following every last Siglent thread on here.

Quote
c) Possibility to link it to a signal generator and do frequency sweeps/Bode plots
 

Offline Andreax1985

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Re: Siglent 1104x-e or 2202x-e?
« Reply #58 on: January 14, 2019, 02:31:34 pm »
It seems that, for the 1104x-e, only 10% of  the bandwidth is attenuated less than 1db. Am I correct? Is this important?
Of course bandwidth flatness isn't exactly the same for each individual vertical gain setting - but other than some cheap designs, it's still fairly consistent for the SDS1000X-E series:

1dB bandwidth at least 74MHz for the 100MHz version.
1dB bandwidth at least 192MHz for the 200MHz version.

See attached tables for the exact 1, 3 and 6dB measurements.

Hi, I've read with so much interest your review of the 1000xe series! It seems to me that bandwidth in the 200Mhz models is flatter. What do you think of the newest 2000x-e series? Would you suggest me the 2ch, 200Mhz, 2Gsa/s version (2202) over the older 4ch, 100Mhz, 1Gsa/s model (1104)?
 

Offline Fungus

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Re: Siglent 1104x-e or 2202x-e?
« Reply #59 on: January 14, 2019, 02:31:50 pm »
how about the 50ohm input in the 2202x-e? do you see it as a big plus?

In an office where things like BNC 'T' adapters are often "borrowed" by other people? Yes.  :)

In a home envirmonent? Not so much.

 

Offline Performa01

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Re: Siglent 1104x-e or 2202x-e?
« Reply #60 on: January 15, 2019, 12:53:11 am »
It seems to me that bandwidth in the 200Mhz models is flatter.
Certainly not. The frontend is identical, there is just one dedicated lowpass filter to limit the bandwidth for the 100MHz model. This is why you see a fairly consistent 3dB bandwidth of 110MHz for the SDS1104X-E, whereas the 200MHz model enjoys the full input bandwidth which is not quite as well controlled but has a decent safety margin instead. That means barely more than 1dB attenuation for the specified bandwidth of 200MHz.

What do you think of the newest 2000x-e series? Would you suggest me the 2ch, 200Mhz, 2Gsa/s version (2202) over the older 4ch, 100Mhz, 1Gsa/s model (1104)?
The "older" model is the identical platform, so the only difference is the higher bandwidth frontend with internal 50 ohms termination and faster ADC with more memory for the SDS2000X-E.

I really cannot suggest anything because only you can answer the question what is more important to you: higher bandwidth or 4 channels?

- An RF engineer will certainly prefer higher bandwidth over four channels.
- "Generation Arduino" on the other hand will get away just fine with 200 or even 100MHz, but will consider four channels handy.
- Audio engineers might not care for any of these and look for a dual channel low bandwidth high resolution DSO instead.

 

Offline Andreax1985

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Re: Siglent 1104x-e or 2202x-e?
« Reply #61 on: January 15, 2019, 01:09:06 am »
It seems to me that bandwidth in the 200Mhz models is flatter.
Certainly not. The frontend is identical, there is just one dedicated lowpass filter to limit the bandwidth for the 100MHz model. This is why you see a fairly consistent 3dB bandwidth of 110MHz for the SDS1104X-E, whereas the 200MHz model enjoys the full input bandwidth which is not quite as well controlled but has a decent safety margin instead. That means barely more than 1dB attenuation for the specified bandwidth of 200MHz.

What do you think of the newest 2000x-e series? Would you suggest me the 2ch, 200Mhz, 2Gsa/s version (2202) over the older 4ch, 100Mhz, 1Gsa/s model (1104)?
The "older" model is the identical platform, so the only difference is the higher bandwidth frontend with internal 50 ohms termination and faster ADC with more memory for the SDS2000X-E.

I really cannot suggest anything because only you can answer the question what is more important to you: higher bandwidth or 4 channels?

- An RF engineer will certainly prefer higher bandwidth over four channels.
- "Generation Arduino" on the other hand will get away just fine with 200 or even 100MHz, but will consider four channels handy.
- Audio engineers might not care for any of these and look for a dual channel low bandwidth high resolution DSO instead.

All in all I think I'll go for the 1104x-e. And if I'll need 200Mhz bw, I can always hack it to a 1204x-e. As far as I understand, a 2Gsa/s sampling rate is non essential for frequencies up to 200Mhz.
 


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