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Siglent SDS2000 new V2 Firmware

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nctnico:
A frequency sweep is also periodic!

smarteebit:

--- Quote from: nctnico on December 28, 2015, 10:26:15 am ---A frequency sweep is also periodic!

--- End quote ---

I don't think it is wise to use averaging to observe a frequency sweep signal. Have a try.

nctnico:

--- Quote from: smarteebit on December 29, 2015, 01:02:57 am ---
--- Quote from: nctnico on December 28, 2015, 10:26:15 am ---A frequency sweep is also periodic!

--- End quote ---
I don't think it is wise to use averaging to observe a frequency sweep signal. Have a try.

--- End quote ---
Use the sync output of the generator as a trigger and you'll be able to average a frequency sweep on a long trace without problems.

Performa01:
Horizontal Position

Just want to point out something that regularly ticks me off – it’s the horizontal position adjustment on many DSOs – not just Siglent.

Let’s have a look at the vertical position first.

I set it 3 divisions down the centre, which corresponds to -60V in the 20V/div vertical gain setting (V_Pos_20V)




Now when I ‘zoom’ into the waveform vertically, by increasing the vertical gain to 2V/div, everything works as expected. The vertical position remains unchanged and corresponds now to -6V, as it should be (V_Pos_2V)




Now let’s do something similar with the horizontal position.

I set the position 2 divisions left of the centre, which corresponds to -1ms at a 500µs/div horizontal timebase setting (H_Pos_500us)




When I ‘zoom’ into the waveform horizontally, by lowering the timebase to 200µs/div, the result is quite different to the vertical settings: now the trigger point moves to the left and is now 5 divisions left the centre (H_Pos_200us)



Of course, making the timebase even faster would move the trigger point out of view.

This behaviour is rather annoying and inconsistent with the vertical position.
Both, x and y position knobs are labelled ‘Position’.
For both, the screen display doesn’t show a position, but an electrical quantity, volts for vertical and seconds for horizontal. But in the case of vertical, the position remains constant and the displayed volts offset changes according to the vertical gain setting, whereas for horizontal, the position changes and the displayed time offset (called ‘Delay’ here) remains constant.

We often want to zoom into a waveform horizontally, but at the same time we don’t want to change the position of the trigger point on the screen.

I know, many scopes (but not all!) do it like the Siglent, but that doesn’t make it right in my book.

Maybe we could get a compromise in one of the next firmware releases: the horizontal menu is pretty empty anyway. Why not include a menu item to chose between constant screen position (as I think it should be anyway) and constant delay (as it is now)?

nctnico:
On many (higher end) DSOs you can adjust the horizontal position. In my case I often have the trigger point set somewhere in the left part of the graticule because in 90% of the cases you are not interested in what is before the trigger point.

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