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| Scope with fast waveform averaging (can your scope go faster?) |
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| maxwell3e10:
I am looking for a scope that can do fast waveform averaging. For example, if the horizontal time span is 10 microsec and trigger rate is 100 kHz, it should be able to average 32768 waveforms in less than 1 sec while skipping every other trigger. In practice it usually takes much longer. Partly it has to do with waveform update rate, but even scopes that claim fast update rate slow down when averaging is on. I am wondering if anyone has looked at this characteristic among low and medium cost scopes? |
| maxwell3e10:
I am still collecting data for how fast various scopes can perform waveform averaging. The simplest setup is to send a 1 Hz sine signal to the scope, expand to minimum timescale and shortest waveform length and then increase the number of averages until the amplitude of the waveform oscillating up and down on the screen goes down by 1/2. So far my results are: Typical low-cost scopes (Siglent, Micsig, Owon): 8 to 16 averages Keysight EDUX: 512 4096 (max allowed 65536) Rigol DS6104: 8192 (max allowed 8192) Siglent SDS2000X HD: 1024 drops by 2% (max allowed 1024) -thanks to rf-loop I would be curious to collect data for other newer scopes: Keysight DSOX3000 series, R&S, etc. Thanks! |
| Marco:
I haven't looked lately, but I assume they are all still sadly pathetic, for no reason other than the firmware sucking. They have the FPGA and memory bandwidth to do better, but they just don't. A few years back in a thread on capture systems with really fast averaging Gage seemed to be the cheapest which came up. |
| maxwell3e10:
--- Quote from: Marco on August 04, 2022, 08:38:48 pm ---A few years back in a thread on capture systems with really fast averaging Gage seemed to be the cheapest which came up. --- End quote --- Another option for purpose-build digitizer with averaging is https://spectrum-instrumentation.com/, they claim it can do 5M waveforms per sec. They also have a software solution using CUDA GPU. Gage can only do 100k waveforms/s with FPGA. But in general I don't like digitizer approach unless absolutely necessary. It can be setup and work for a single project. Then inevitably the computer or the software gets messed up and no one wants to touch it again. In contrast, a good scope can last decades for many projects. |
| Someone:
--- Quote from: maxwell3e10 on August 04, 2022, 08:15:11 pm ---I am still collecting data for how fast various scopes can perform waveform averaging. The simplest setup is to send a 1 Hz signal to the scope, expand to minimum timescale and shortest waveform length and then increase the number of averages until the amplitude of the waveform oscillating up and down on the screen goes down by 1/2. --- End quote --- But whats the trigger? if "auto" then its anyone guess how fast triggers are being issued and if they are uncorrelated with the 1Hz signal. Sounds like a very roundabout way to try and estimate averaging speed. There are some measured averaging rates already on the forum: https://www.eevblog.com/forum/testgear/oscilloscopes-averaging-speed/ |
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