Products > Test Equipment
FeelTech FY6600 60MHz 2-Ch VCO Function Arbitrary Waveform Signal Generator
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CDaniel:
I see 4nS jitter for pulse wave at 2-3 sec . That's the code inside the FPGA , like the square wave jitter .
This "details" need a lot of coding work , that a small chinese company is unwilling/unable to do ...
Johnny B Good:

--- Quote from: CDaniel on September 06, 2019, 02:28:08 pm ---I see 4nS jitter for pulse wave at 2-3 sec . That's the code inside the FPGA , like the square wave jitter .
This "details" need a lot of coding work , that a small chinese company is unwilling/unable to do ...

--- End quote ---

 This does raise the question as to whether investing in a more "Up Market" DDS based arbitrary wave generator would resolve this issue. Perhaps someone following this thread who happens to own such a more up market generator could oblige by repeating this test and report their results?

 JBG
rhb:
Is a Keysight 33622A "up market" enough?

Give me the settings and I'll put the 33622A outputs and a GPSDO output on a 4 channel scope.  I know I can trigger my 200 MHz Instek and 1.5 GHz LeCroy, but I'm not sure about the Tek 11801 w/ a 20 GHz SD-26 sampling head.  It's a bit exotic and I'm still earning how to operate it.  Keysight claims less than 1 ps jitter for the 33622A  And I actually believe that claim.  Though the 11801 has too much jitter (4 ps) to actually test it.

I should note that if the clock chip in the F***Tech is not a fractional N device, it will have settings with much more jitter than others.  And even with fractional N devices there are still issues at certain settings. TANSTAFL.

Have Fun!
Reg
CDaniel:
"Up Market" for me  would be Siglent , Rigol ...  an expensive Keysight I'm sure doesn't have this issues .
TurboTom:
...did some testing with the AWGs that I've got access to.
Settings:

Ch1 10MHz Square
Ch2 1Hz Square
"Phase Mode Coupled" if applicable

If the phase wasn't stable, I increased the frequency of Ch2 in decimal logarithmic steps until no phase walk-through was observable anymore.

Siglent SDG6000: Phase stable at initial settings
Rigol DG800/900: Phase stable at frequency ratios <= 1000:1 (i.e. Ch2 10kHz)
Rigol DG4000: Phase stable at frequency ratios <= 10e6:1 (i.e. Ch2 10Hz)
Hantek HDG2000B (crappiest thing I've got...): Phase stable at frequency ratios <= 10e4:1 (i.e. Ch2 1kHz)
Rigol MSO2000A-S, internal generator (surprise, surprise...): Phase stable at initial settings

Hope this information might help to enlighten the situation.

Cheers,
Thomas




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