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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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