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DSO4104C - FFT Bugs

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Post time 7 day(s) ago | Show all posts |Read mode
Hi,

I recently bought a DSO4104C, which I like very much.  I've been trying to use the FFT math function and there are the bugs that I can see.

1) The FFT divisions are wrong: I tested with a triangle waveform and the 3rd harmonic was 40 dBV lower than the fundamental, it should be 20 dBV lower.  This is known and can be calculated, I took the the CSV of the waveform and used a maths program to double check.  It looks like the divisions are twice what they should be.

2) When using the cursors on the math fuction, using FFT, the cursors don't track.

3) The cursors don't read the correct value, (doesn't match the axis on screen), when the FFT reference level is not 0 dB.

The scope is very nice and it would be good if you could fix the above.

Thanks.  

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Post time 5 day(s) ago | Show all posts



Sir, we will test and reply you later.
Please wait for a while.

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 Author| Post time 3 hour(s) ago | Show all posts
Thanks, I'll wait.
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