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| 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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