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Signal behavior with function generator
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rvalente:
Hello Mates,

I own a FY6800 (feeltech), when the frequency is changed it has this characteristic to add a discontinuity in the signal phase.
Here a 5Vpp was changed from 500 to 1500Hz.

Is this expected or does Feeltech handle poorly the frequency generation?

How other function generators handle this? I may buy a DG821 very soon if it has a better continuity while changing freqs.

Greetings
David Hess:
It just was not designed to be phase coherent.  That has to be done deliberately.  In most applications it is irrelevant.
Anthocyanina:
I've set the oscilloscope as close to yours as i could from the information on the screenshot. The trigger details that I can't see in your screenshot have been set as shown in this screenshot. Then i set a list sweep on my generator(EDU33212A), it has 500 and 1500 Hz on the list, and plays each frequency for 1ms each. It clearly changes between each frequency and the phase is continuous. Hope this helps! 
tautech:
They all do this when adjusted manually but not for a sweep which is what really matters.
Learn to properly use the feature set instead of focussing on something that was never part of the design brief.
Anthocyanina:
I realised the frequencies shown in your screenshot were 2500 and 1500 hz, I've set the oscilloscope for a pulse trigger, single shot, the generator was outputting the lower frequency continuously, then i manually entered the higher frequency and got this single shot capture. The phase is also continuous when doing it manually in my case. I also did that first with the 500 and 1500 hz sines, and got the same result with the phase being continuous
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