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

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Supernick:

Sine is cool - on the full range.
square is bad from start range..

please look

PS. jitter is 4ns, it's true. But why in fy6600-30M jitter is not present?

rf-loop:

--- Quote from: SMB784 on September 20, 2018, 03:22:22 am ---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

--- End quote ---

As far as I know square wave and rectangle wave is not sinusoidal.
What Siglent model have this kind of jitter with Square/Rectangle (other than 50% square)

But then yes, if look Triangle/saw, pulse, arb, there is jitter related to clock. (and example cheaper Siglent models may have example 150MSa/s clock what mean 6.7ns cycle to cycle jitter exept some "golden" frequencies.

But as seen here some previous example images about FY6600 using square have lot of jitter, cheap Siglent model 1000X do not have this type of jitter ancluding also rectangle waves = square duty other than 50%  (not even with 0.001% duty what can also call as "pulse" but in this mode rise and fall time or pulse width can not adjust using 0.1ns adjust steps) My opinion is that Square and Sine need do so that they do not have 1 clock jitter.  Other waveforms can perhaps accept more in cheap simple equipments.

Siglent do not have this "1 clock" square jitter in real life and also -- not in specs sheet (exept pulse mode, triangle and arb)
Is it better to stay with facts and not trumpths.


SMB784:

--- Quote from: rf-loop on September 20, 2018, 09:15:15 pm ---
--- Quote from: SMB784 on September 20, 2018, 03:22:22 am ---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

--- End quote ---

As far as I know square wave and rectangle wave is not sinusoidal.
What Siglent model have this kind of jitter with Square/Rectangle (other than 50% square)

But then yes, if look Triangle/saw, pulse, arb, there is jitter related to clock. (and example cheaper Siglent models may have example 150MSa/s clock what mean 6.7ns cycle to cycle jitter exept some "golden" frequencies.

But as seen here some previous example images about FY6600 using square have lot of jitter, cheap Siglent model 1000X do not have this type of jitter ancluding also rectangle waves = square duty other than 50%  (not even with 0.001% duty what can also call as "pulse" but in this mode rise and fall time or pulse width can not adjust using 0.1ns adjust steps) My opinion is that Square and Sine need do so that they do not have 1 clock jitter.  Other waveforms can perhaps accept more in cheap simple equipments.

Siglent do not have this "1 clock" square jitter in real life and also -- not in specs sheet (exept pulse mode, triangle and arb)
Is it better to stay with facts and not trumpths.

--- End quote ---

I never specified which models I was referring to.  In fact for the SDG830 (>$300) there is 1 clock cycle (8ns) for arbitrary wave forms, which are non sinusoidal. Nothing that I said was untrue.

The main point of what I was saying is that the 4ns jitter in the FY6600&6800 is to be expected, and is actually less than that of competing generators in some modes.

rf-loop:

--- Quote from: SMB784 on September 20, 2018, 11:50:46 pm ---
--- Quote from: rf-loop on September 20, 2018, 09:15:15 pm ---
--- Quote from: SMB784 on September 20, 2018, 03:22:22 am ---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

--- End quote ---

As far as I know square wave and rectangle wave is not sinusoidal.
What Siglent model have this kind of jitter with Square/Rectangle (other than 50% square)

But then yes, if look other non sinusoidal as example triangle/saw, pulse, arb, there is jitter related to clock. (and example cheaper Siglent models may have example 150MSa/s clock what mean 6.7ns cycle to cycle jitter exept some "golden" frequencies.

But as seen here some previous example images about FY6600 using square have lot of jitter, cheap Siglent model 1000X do not have this type of jitter ancluding also rectangle waves = square duty other than 50%  (not even with 0.001% duty what can also call as "pulse" but in this mode rise and fall time or pulse width can not adjust using 0.1ns adjust steps) My opinion is that Square and Sine need do so that they do not have 1 clock jitter.  Other waveforms can perhaps accept more in cheap simple equipments.

Siglent do not have this "1 clock" square jitter in real life and also -- not in specs sheet (exept , triangle and arb)
Is it better to stay with facts and not trumpths.

--- End quote ---

I never specified which models I was referring to.  In fact for the SDG830 (>$300) there is 1 clock cycle (8ns) for arbitrary wave forms, which are non sinusoidal. Nothing that I said was untrue.

The main point of what I was saying is that the 4ns jitter in the FY6600&6800 is to be expected, and is actually less than that of competing generators in some modes.

--- End quote ---

As I told Square and rectangle  are not sinusoidal and Siglent (not even SDG800 serie or SDG1000X serie) do NOT have this jitter as FY have. And not even in Pulse mode. You told that not sinusoidal have. So it was wrong.  It is surprice that FY have this one clock jitter in Square or rectangle in square mode. And btw, also SDG800 series do not have it in square/rectangle mode. Square is one typically most important to be low timing jitter after sinewave. 
Totally different things are other wfms like arb, triangle, pulse in fixed clock system. There also in Siglent is one clock jitter and in 125MSa/s models it is 8ns and in 150MSa/s it is 6.7ns and so on as every school kid can calculate ans also told in datasheets.



--- Quote from: SMB784 ---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
--- End quote ---

Simplified:
If you talk non sinusoidal wfms it include all but not sine. (sentence logic!)
The argument is false, even if you try explain you did not say or mean wrong.

It is true only with FY

If look square, rectangle and pulse mode in Siglent SDG800 and SDG1000X they both outperfom FY just hands down and specially with this jitter. Siglent do not have one clock jitter in Square, rectangle and pulse mode, using what ever user-defined pulse width and or with what ever user-defined pulse rise and fall times or duty% if talk Square function. Including all frequencies.

Square(including rectangle)  and  Pulse
800 series is worst but  even it have specified max 500ps +0.001% (10ppm) period
1000X series max 300ps +0.05ppm period
And typically much less.

This is why they use own developed "EasyPulse" technology what make possible to do these without 1 clock jitter in this kind of simple DDS generator and what FY can not do.

Even oldest SDG1000 serie do not have 1 clock jitter with square/rectangle what is derived by hardware from internal sine.

Arb is different, it is simple way produced from arb memory.
Also triangle have 1 clock jitter.

---------
(and even in this el cheapo FY it is really strange when they still can produce normal almost ok sine and then they can not do it with square without one clock jitter.  Other waveforms than sine and square are bit different things and in simple principle DDS generators it can understand these have one clock jitter (+ small amount other origin random jitter))
NNR

thielj:
I bought the FY6800-60 and the display stopped working after the 3rd use (backlight lights up, but display simply stays white/blank, while the unit, all buttons, signal generator etc is still working). After some discussions, the seller promised to send me a display board to exchange myself but nothing has arrived yet.

I've now opened the case and checked all the connectors etc. Is there anything obvious that could cause the display to stay blank that I would be able to fix myself?

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