Hello How could I test the time to analog converter we talked few posts ago? Something that can be done with things I have or can easily find.
I was thinking that would be nice to try to feed it with signals similar to the real ones, but that can be controlled: PPS + 10MHz reference, without the PPS tipical jitter. To do so I was thinking to use the PPS from one of the 2 FE5680 and the 10MHz from the second ad use these to simulate the real signals. I can tune the frequency of the Rb with the serial interface (tested and working). I'd like to verify both the resolution and repeteability. I was trying to figure the approx jitter I will have using the Rb like I said above, so I'm giving an eye to this diagram from John Miles page: http://www.ke5fx.com/rb.htm If I'm understanding correctly, that 5680 at 1s should have most of the jitter (95% +-2sigma) into an interval +- 3.08x10^-11 wide, i.e. about 62pS on the PPS signal (non considering the PPS buffer inside the 5680). Is this how it work, or I'm mistaking? This is from only one unit, but both unit will have the jitter, how to take into account the jitter from both? Is there a better method to make this test? I could try to test the TAC alone feeding it with a 100 to 200nS pulse, but I dont know from where to start to generate a clean stable and repeteable pulse. I have the 2 5680, the counter with it's 10MHz inputs and outpus, and a Vectron OCXO that came with one of the 5680, with these markings: OCXO500-18 63.897600MHz 34537 A0715 and... soldering iron, solder and scrap electronics :) Thanks, Fabio. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
