Re: [time-nuts] teensy as time capture device

In message <5602f65b.6050...@earthlink.net>, Jim Lux writes: >I've got a teensy3.1 hooked up to a 33120 function generator (not >exactly a super stable device) and generating period data for a 1 Hz >square wave. That is actually a particularly bad way of doing it, because the 33120 wil

[time-nuts] more teensy timer stuff

Got the Rb hooked up. 1E-8, 1E-9 kind of AVAR (after linear trend removal) for 10 minute run. next, we'll try running it clocked at 96 MHz ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listi

Re: [time-nuts] first teensy3.1 data

Jim, There is some systematic bumps in there which make me wonder what happens here. Care to share data/plots for phase? You want to understand the systematics when it looks like that. Cheers, Magnus On 09/23/2015 09:09 PM, Jim Lux wrote: a bit more than 5 minutes of data. Now to go get a

[time-nuts] first teensy3.1 data

a bit more than 5 minutes of data. Now to go get a real 1pps source that's decent. ___ 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.

[time-nuts] teensy as time capture device

I've got a teensy3.1 hooked up to a 33120 function generator (not exactly a super stable device) and generating period data for a 1 Hz square wave. The period is in "ticks" of the 48 MHz clock, so my thinking is that if I hook up a good 1pps, what I'm really measuring is the frequency of the

Re: [time-nuts] time-nuts Digest, Vol 134, Issue 23

Hi Bob, I have a similar oscillator tied to a GPSDO that another list member is developing. I have not seen the EFC turn around! That's seems very unusual. If you are interested, I may be able to give you a plot of my EFC over the last ~3000 hours. Pretty boring decay curve, with the oscillat

Re: [time-nuts] Z380XA The saga of the aging 10811

Hi > On Sep 22, 2015, at 11:49 PM, Bob Benward wrote: > > Continuing this discussion, I have included a PDF showing the past 30days of > EFC. Amazingly, the drift has reversed direction! Yes, it’s fairly common. The standard advice with OCXO’s is to leave them on power as much as you possibl

Re: [time-nuts] algorithms and hardware for comparing clock pulses

Hello All, Another night heroically wasted, and I have achieved a PID lock within 50 / 80 000 000 th of a second between two clocks. 50 is there because it is the minimum clock ticks for the irq handler to execute. To summarize: 1. I am using a TI launchpad running at 80mhz. I was using micros()

[time-nuts] Standalone GPSDO Operation of the Lucent KS-24361 REF-0

My report on conversion of the Lucent REF-0 unit for GPSDO operation has been updated: https://www.dropbox.com/s/hqfr9gsfssklrjj/Standalone%20Lucent%20REF-0.pdf?dl =0 Peter ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https

Re: [time-nuts] algorithms and hardware for comparing clock pulses

Group, Seems to me that what's needed here is a current source for linear volts vs. time and the cmos switching to control the duration of the capacitor charge while the phase flip-flop is on. When it turns off, it interrupts the processor and isolates the capacitor so it acts as a sample-and-hold