What is the length of your Lanczos filter?
What is the length of your Lanczos filter?well this is quite embarassing iirc i set "wing" length as small as possible due to some complication i encountered earlier, extra ringing? iirc... length only like 2 or 3 i dont have indepth knowledge about it and its effect. thanks for your info, i'll looking into it deeper later...
I just don't know if you measure the length in the same way as I do, therefore I have added the plots to show what I mean with lenght 3.
Since we are so far off topic, I guess it's okay for me to ask an incidental question. While all this conversation is quite interesting and instructive, I'm curious how many people actually use or need bandwidth or sampling beyond 100 MHz and 312.5 S/s?
Presumably, anyone working in comms, but who else? My thought process when buying the DHO800 was that even with 4 channels operating, I still have enough sampling to adequately cover the 100 MHz capability of the scope with the 150 MHz probes being well clear of having any attenuation effect at 100 MHz.
Let's see whether they are brave enough to distribute this hack (and other related ones). The DHO1000 hacking took a similar approach of decompiling and patching the executables, back in December. I keenly followed that effort, since I had a DHO1074 at the time and was hoping to see the 50 Ohm inputs and 400 MHz bandwidth enabled.
Back then, the developer(s) never made their modifications available to others and eventually pulled the plug on that effort -- due to legal concerns in my understanding. Rigol does explicitly forbid reverse engineering and decompiling in their license terms. Of course we have not seen them act on this, but who is willing to run the experiment?
Somebody just added a full screen mode to the Rigol...
What was the topic again?
Question for a friend...
Since we are so far off topic, I guess it's okay for me to ask an incidental question. While all this conversation is quite interesting and instructive, I'm curious how many people actually use or need bandwidth or sampling beyond 100 MHz and 312.5 S/s?
Since we are so far off topic, I guess it's okay for me to ask an incidental question. While all this conversation is quite interesting and instructive, I'm curious how many people actually use or need bandwidth or sampling beyond 100 MHz and 312.5 S/s? Presumably, anyone working in comms, but who else? My thought process when buying the DHO800 was that even with 4 channels operating, I still have enough sampling to adequately cover the 100 MHz capability of the scope with the included 150 MHz probes being well clear of having any attenuation effect at 100 MHz.
For example, here are some waveforms from a buck convertor I designed and built this week running at 100 kHz. (Note the oscillations on switching are mostly due to using the clip-on scope probes...when I use the spring and tip, the yellow gate drive signal is clean and the overshoots on the cyan and magenta traces halve.)
My question is....for the kind of work I'm doing (hobbyist audio and SMPS in the 100 W to 5 kW range), what would be the benefits, if any, in me having a more capable scope? (Please excuse my ignorance, as my professional background is 50 Hz HV & EHV transmission)
Somebody just added a full screen mode to the Rigol...charming indeed but... the hidden complication is "not signed" app meaning no access to system file, cannot do screen capture. thats why be careful making post like this in beginner section.
Screen capture over network still works even on an unsigned app.
that lead to proper Sinc reconstruction reveals siglent DHO800X can do it properly unlike Rigol, this can also can help user make decision whether this is important or not.
that lead to proper Sinc reconstruction reveals siglent DHO800X can do it properly unlike Rigol, this can also can help user make decision whether this is important or not.
When was THAT proven?
that lead to proper Sinc reconstruction reveals siglent DHO800X can do it properly unlike Rigol, this can also can help user make decision whether this is important or not.
When was THAT proven?
In reply #465, 2N3055 showed stable reconstruction of a 220 MHz sine which was sampled at 500 MSa/s. So the SDS800X HD can still resonstruct properly at a sampling rate of less than 2.5x of the signal frequency, while the Rigol started to show wobbles at 3x or so.
Let's call it a demonstration, not a "proof", since this was just a quick one-off test.
Screen capture over network still works even on an unsigned app.not everybody like to connect to network for a mere screen capture, i do it with usb stick. my ethernet cable is super long and its quite a mess trying to run it to my dso, at my lab setup, connecting to usb cable is much easier. and that luckily i have ethernet cable at all so i can do some adb hack albeit a bit inconvenience. ymmv.
Nowadays jellybean logic has edge rates of 1ns, and faster. That translates to 350MHz, and higher.
In reply #465, 2N3055 showed stable reconstruction of a 220 MHz sine which was sampled at 500 MSa/s. So the SDS800X HD can still resonstruct properly at a sampling rate of less than 2.5x of the signal frequency, while the Rigol started to show wobbles at 3x or so.
The Rigol is applying the theory correctly
I'd like to see a frequency sweep.
Screen capture over network still works even on an unsigned app.not everybody like to connect to network for a mere screen capture, i do it with usb stick. my ethernet cable is super long and its quite a mess trying to run it to my dso, at my lab setup, connecting to usb cable is much easier. and that luckily i have ethernet cable at all so i can do some adb hack albeit a bit inconvenience. ymmv.Cable? My WiFi adapter cost me $7...
BTW, speaking of signal integrity, the (unlocked) Rigol can more or less properly show signals at up to 500 MHz at 1.25 Gsa/s (the 2.5x ratio again btw), albeit with a greatly reduced amplitude, apparently because of the hardware low-pass filter on the input.
In reply #465, 2N3055 showed stable reconstruction of a 220 MHz sine which was sampled at 500 MSa/s. So the SDS800X HD can still resonstruct properly at a sampling rate of less than 2.5x of the signal frequency, while the Rigol started to show wobbles at 3x or so.I'd like to see a frequency sweep.
The Rigol is applying the theory correctly and the Siglent can't possibly be doing an infinitely wide reconstruction, so...
not everybody like to connect to network for a mere screen capture, i do it with usb stick. my ethernet cable is super long and its quite a mess trying to run it to my dso, at my lab setup, connecting to usb cable is much easier. and that luckily i have ethernet cable at all so i can do some adb hack albeit a bit inconvenience. ymmv.
this is +1 imho in rigol, lets not forget, the 2 scopes discussed here got pros and cons.