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Siglent SDG1032X - Sweep does steps of frequency
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eTobey:
On the picture, you can see, that in the beginning, the frequency is constant for about 1s. (notice the constant artefacts, that show a constant frequency from '-1s' to '0s')

It is a 3s sweep from 100Hz to 30MHz.

Is this a normal behaviour of such devices? I would have expected the frequency to rise without steps.

(Yes, i know, its a noobish question, but i accidently posted it in the wrong section, and cant delete it.)




2N3055:

--- Quote from: eTobey on June 02, 2024, 07:37:50 am ---On the picture, you can see, that in the beginning, the frequency is constant for about 1s. (notice the constant artefacts, that show a constant frequency from '-1s' to '0s')

It is a 3s sweep from 100Hz to 30MHz.

Is this a normal behaviour of such devices? I would have expected the frequency to rise without steps.

(Yes, i know, its a noobish question, but i accidently posted it in the wrong section, and cant delete it.)

--- End quote ---

I have an advice for you.
Every time you have a problem like this, ask yourself what did you expect to happen. And how would you do it if you were to make a such device.

Let's turn the thing upside down. From 100Hz to 30MHz in 3 seconds....
Is it log or linear sweep?
If linear, that is roughly 10MHz/s sweep.

At time:
zero +1s you are at 10MHz (100ns period)
zero +100ms you are at 1MHz (1µs period)
zero +10ms you are at 100Khz....

Wait...
At zero+10ms you are still at first period of 100Hz .... hm...

How can it beeee... Maybe we cannot ask AWG to generate mathematically/physically  impossible frequencies....

eTobey:
Its a log sweep.

I dont understand what you try to explain. I can not imagine impossible frequencys, apart from 0 or negative ones.
nctnico:

--- Quote from: eTobey on June 02, 2024, 09:32:02 am ---Its a log sweep.

--- End quote ---
Log sweeps are typically implemented as a series of steps on AWGs and thus skipping frequencies. This can lead to rather odd results like partial sine waves at low frequencies. But still, I would expect the image to show a more constant amplitude. Did you turn peak-detect on on the scope and use a BNC cable?
2N3055:

--- Quote from: eTobey on June 02, 2024, 09:32:02 am ---Its a log sweep.

I dont understand what you try to explain. I can not imagine impossible frequencys, apart from 0 or negative ones.

--- End quote ---

Are you one of those people that think that if you can write something in a mathematical formula then it has to exist in physical world?

Please create me 100Hz signal that lasts 100ns.
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