Products > Test Equipment
Scope with fast waveform averaging (can your scope go faster?)
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maxwell3e10:
I retested a few scopes again, couldn't see much difference between auto trigger and normal trigger with >100 kHz rate.

On Keysight EDUX1002 I now get up to 4096 averages before the waveform amplitude drops by a bit more than 1/2 (see picture, initial signal is nearly full vertical scale).

On Siglent SDS1104X-E I get very slow averages even if the number is set to 4. Not sure if it has the latest firmware or maybe some other setting is making it slow, perhaps someone else should check.
jjoonathan:
Ohh, 10us wasn't a part of the requirement? In that case, the RTO is faster, see above.
switchabl:
On a Keysight 2000X series scope I can get up to 13.3k wfms/s in averaging mode (dependent on the timebase setting but not the number of averages), down from 220k wfms/s in normal mode. This is measured with a frequency counter connected to the trigger output.

The -3dB frequency of a moving average filter is approx. fs * 0.443 / N (for large N). So that works out at around 5800 averages in your methodology. Depending on the actual implementation, things may be a bit more complicated (don't believe it is actually purely a FIR filter, so the frequency response may be somewhat different).
JehTeh:
I might not be running this test right, but I was bored and had a few minutes this evening around the house - my Rigol MSO8204 just falls under the halfway mark at 32768 averaged samples. At 8k, no drop at all and at 16k it just starts to fall off.

This is at 200ps/div though - I did not play around much with longer time base settings.

1Hz square wave on channel 1, 1Vpp. I had the external trigger on 1MHz though but I don't think she will actually trigger that often  :'(...

I don't know if there is a built in display on the Rigol for wfms/s (which would be nice) and I didn't feel like dragging its baby brother I have on the shelf out for checking trigger rate, but I think in this configuration it should be running basically full speed.

32k samples


16k samples


8k samples

maxwell3e10:
Welcome to the forum! This looks like the fastest so far! But I am not sure if square wave input would give the same result as sine wave. Could you check if it's similar with 1 Hz sine wave input?
Also I noticed it says the waveform has only 20 pts. Does the scope give you an option to limit number of waveform points to only what is on the screen?
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