Products > Test Equipment
Siglent SDG1032 Amplitude not constant when sweeping
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eTobey:
I have found a really helpful video:


I now put the probe directly into the AWG. But the result is only somewhat better. (see picture)
_Wim_:

--- Quote from: eTobey on May 18, 2024, 06:14:27 pm ---I now put the probe directly into the AWG. But the result is only somewhat better. (see picture)

--- End quote ---

Are you using a scope probe instead of a BNC cable? A scope probe uses resistive coax and cannot be used for this purpose. Just do "siggen => bnc cable => 50-ohm adaptor => Scope"
eTobey:

--- Quote from: _Wim_ on May 18, 2024, 06:29:35 pm ---
--- Quote from: eTobey on May 18, 2024, 06:14:27 pm ---I now put the probe directly into the AWG. But the result is only somewhat better. (see picture)

--- End quote ---

Are you using a scope probe instead of a BNC cable? A scope probe uses resistive coax and cannot be used for this purpose. Just do "siggen => bnc cable => 50-ohm adaptor => Scope"

--- End quote ---
But what do i do, if i want to measure that signal? It confuses me, that i cannot use a probe for measuring a signal, as you say.
nctnico:

--- Quote from: eTobey on May 18, 2024, 06:45:31 pm ---
--- Quote from: _Wim_ on May 18, 2024, 06:29:35 pm ---
--- Quote from: eTobey on May 18, 2024, 06:14:27 pm ---I now put the probe directly into the AWG. But the result is only somewhat better. (see picture)

--- End quote ---

Are you using a scope probe instead of a BNC cable? A scope probe uses resistive coax and cannot be used for this purpose. Just do "siggen => bnc cable => 50-ohm adaptor => Scope"

--- End quote ---
But what do i do, if i want to measure that signal? It confuses me, that i cannot use a probe for measuring a signal, as you say.

--- End quote ---
Follow this rule: Either use the probe as-is (no 50 Ohm termination at the oscilloscope side) OR use a BNC cable with 50 Ohm terminator at the oscilloscope side.

Did you adjust the probe correctly? See probe compensation procedure.

But this still doesn't explain why the amplitude is near zero at low frequencies. First use a BNC cable between the generator and the oscilloscope and do the measurement again. Leave the probe out.
eTobey:
It made "click"

The solution i did: i put a 50 Ohm termination on the point, where i measured with the probe. It doesnt look perfect, but good enough for me. (Its  51Ohm but never mind)

I tried to put up a little breadboard with a trimmer, to get to exactly 50Ohm, but then it looked like a cross section of a mountain range.  ;D
So i guess, everything, that is behind the 50 Ohm termination, can still reflect waves. Or is it because of the rather bad connections of the breadboard?

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