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FeelTech FY6600 60MHz 2-Ch VCO Function Arbitrary Waveform Signal Generator

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Supernick:
Hi all, please help

i buyed fy6800 on ali, but on the all frequencies (excl 5.000Mhz) i have a static jitter.

1) checked oscillator - all ok. good sine, freq 50.0007 on oscilloscope. Amplitude is good.
2) checked direct lines from ALTERA - jitter is present.. and on the control point (T1.. T2..) signal with static jitter

from ch1 and ch2 signal is splited


what is it? how to fix? what the check?

ps. i tryed rewrite my flash (winbond). Dumps from this thread. Device or does not work or non stable and without signal on chanels


MODEL: FY6800-60
BOARD: 1.51
FW: 1.7

SMB784:
That jitter is both normal and expected. In fact you will find that for non-sinusoidal waveforms, all frequencies above 5MHz that aren't an integer multiple of the sample frequency of 250MHz will have a 4 ns jitter (4ns=1/250MHz).

At the moment there is no known way around this issue, and it appears to simply be a feature of the generator.

Maybe in the future it will be possible to correct it with software, but for the moment it's just something you have to deal with. Also, according to the spec sheet for other similar generators like the more expensive and less capable models from siglent, rigol, and gw instek, their jitter is as bad or worse for non-sinusoidal waveforms

Supernick:
thank you for your reply!

but in fy6600-30Mhz all supergood. any signal forms without jitter on any freq
and other FY6800 owners (I asked) confirmed that they have a signal without a jitter

why?

Supernick:
also.. jitter is present on all range. from 10KHz.. Mhz
only 5MHz without jitter  |O

SMB784:
Try the following square wave frequencies: 60 MHz, 50MHz, 30MHz, 25MHz, 15MHz, 12.5 MHz, etc. Then try them with sine waves, and see where the jitter appears

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