Products > Test Equipment
Siglent SDG1032 Amplitude not constant when sweeping
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Aldo22:

--- Quote from: eTobey on May 19, 2024, 11:28:23 am ---What is this board??

--- End quote ---
That doesn't matter. I just wanted to show that SMA connectors are quite common for such devices.
You can get them cheaply: https://de.aliexpress.com/item/1005003311808070.html

The DUT in the example is this: https://de.aliexpress.com/item/1005005704247436.html
nctnico:

--- Quote from: Aldo22 on May 19, 2024, 11:24:08 am ---
--- Quote from: ebastler on May 19, 2024, 10:38:38 am ---Edit: Oh, and if you need to deliver that 1..30 MHz sweep to your device under test, you need to provide a proper input for it on the DUT. (BNC, 50 Ohm terminated.)

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Or SMA with adapter, which is handier.
I always try to keep the distances as short as possible so that there is less noise etc.  ;)

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But do not get overworked about the frequency. Keep in mind that the wavelength of a 30MHz sine wave is around 10 meters. With a cable length of up to 2 meters, reflections aren't an issue. If I needed to bet money, I'd put it on a display artefact of the oscilloscope. The differences in amplitude as shown by screenshots are a tell-tale sign. This is why it is so important to get some images which show the waveforms at the frequencies where the amplitude is highest and lowest.
eTobey:
I now zoomed it further. I deliberately picked a place where there was an artefact. It was a break in the sweep without a signals, but it is rather narrow, and it gets overlayed by the signals on the side. i could measure 3 break in about 13.4 ms interval after each other.

It is only visible in normal aqusition, and not in peak acq. Changing the acqs. mode does not change the sweep amplitude that is seen on the scope.
Aldo22:
@eTobey: Somehow I'm lost.
Could you repeat the question?
Is it about Siglent SDG1032 sweeping, coax/wiring, oscilloscope settings, frequency response of your DUT or what exactly?

Maybe it would also be useful if you could show your DUT?
eTobey:

--- Quote from: Aldo22 on May 19, 2024, 02:39:36 pm ---Is it about Siglent SDG1032 sweeping, coax/wiring, oscilloscope settings, frequency response of your DUT or what exactly?

Maybe it would also be useful if you could show your DUT?

--- End quote ---

It was a bit of everthing, except scope settings. I just added that screendump, because someone wanted it (kind of).
But i am satisfied with the information here and my findings: https://www.eevblog.com/forum/testgear/siglent-sdg1032-amplitude-not-constant-when-sweeping/msg5506162/#msg5506162
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