Products > Test Equipment
Siglent SDS2000X HD, missing Features and Bugs
2N3055:
--- Quote from: KungFuJosh on October 02, 2024, 04:30:33 pm ---
--- Quote from: 2N3055 on October 02, 2024, 04:21:17 pm ---I'm not sure that is even possible....
It is hardcoded now so it can be simple and optimized. Triggering is realtime operation running of full speed datastream.
--- End quote ---
I think it may be possible to be added as a feature because the hardcoded frequencies 1. don't match (internal vs. external), and 2. aren't standard filter numbers like for the channel filters. It seems they were chosen at least somewhat arbitrarily and should be able to be replaced with a variable input. Or, a new trigger coupling filter with a variable input added, but that would seem redundant.
Thanks,
Josh
ETA: Check out nctnico's post with channel filtering: https://www.eevblog.com/forum/testgear/new-keysight-infiniivision-hd3-oscilloscope/msg5663417/#msg5663417
That would be nice too. 😉
--- End quote ---
Nico's post has nothing to do and don't confuse it with channel filtering.
HP and LP filter in trigger works on full data rate and it is at it is because filter was chosen that was fastest and it landed approximately where it did.
As for filters in math, they are have current characteristics because of number taps in implementation. As Martin said, it is similar to LeCroy in that regard.
Other manufacturers did something else, and they are either decimating or use some nonstandard filtering method. Siglent uses proper FIR filters.
Filter on Keysight 3000T can filter lower frequencies with same sample rate, but it's characteristics is not documented at all and it is basically visual aid.
Micsig I have also have limits when sampling at higher sample rates.
Do not get me wrong. I will raise this question with Siglent. I personally would like if filters on Siglent scopes would be more powerful. But maybe this was resource limit? I don't know.
KungFuJosh:
--- Quote from: 2N3055 on October 02, 2024, 05:22:05 pm ---Do not get me wrong. I will raise this question with Siglent. I personally would like if filters on Siglent scopes would be more powerful. But maybe this was resource limit? I don't know.
--- End quote ---
Awesome, thank you!
Speaking of actual channel filtering, do you think they might add 50M and 100M to the channel filters? Mine goes from 20M directly to 200M, but a couple stops between would be nice.
Thanks,
Josh
2N3055:
--- Quote from: KungFuJosh on October 02, 2024, 05:28:44 pm ---
--- Quote from: 2N3055 on October 02, 2024, 05:22:05 pm ---Do not get me wrong. I will raise this question with Siglent. I personally would like if filters on Siglent scopes would be more powerful. But maybe this was resource limit? I don't know.
--- End quote ---
Awesome, thank you!
Speaking of actual channel filtering, do you think they might add 50M and 100M to the channel filters? Mine goes from 20M directly to 200M, but a couple stops between would be nice.
Thanks,
Josh
--- End quote ---
Well, those are actual hardware filters. They are proper anti aliasing filters before ADC.
If I need more control I use ERES.
KungFuJosh:
--- Quote from: 2N3055 on October 02, 2024, 07:08:36 pm ---Well, those are actual hardware filters. They are proper anti aliasing filters before ADC.
If I need more control I use ERES.
--- End quote ---
Isn't there also an actual 100M filter? It started life as a 100MHz scope, I thought there might be a proper filter for that too.
KungFuJosh:
Bode still doesn't remember some previous session settings after power off.
Sweep was set to single, comes up as continuous.
Load was Hi-Z, comes up as 50Ω.
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