ke...@rosenberg.net said: > I'm looking for device with an external clock input as well as inputs for > multiple PPS signals that outputs timestamped messages for each input pulse > via RS232. ...
What sort of accuracy and/or resolution do you want/need? > 5) Using a FreeBSD or Linux box with multiple RS-232 inputs and using their > PPS API. However, outside of some ARM boards, I haven't found any boxes > that can be clocked by a external reference. And, I haven't enough > experience running FreeBSD or Linux on ARM to know how well this will work > for me. > 7) Use a box like in #5, and capture the PPS from the PRS-10 as well and > using that to scale the other PPS inputs that arrive around the same time. If you have a Linux box handy, that one is easy to try. After the 60Hz grab-every-cycle experiment, I started collecting every-cycle data for PPS signals. I have a box with 3 PPS signals: one from a Z3801A and 2 from low cost GPS units. I can send you some files if you want to investigate. (5-6 megabytes per day) I'll have to make some graphs. The ballpark is several microseconds of noise, but that's on top of your system clock offset. I think it would be easy to see 10 microseconds of offset. You would have to work harder to see smaller numbers. Reminder: Your system may have troubles catching 10 microsecond PPS signals. TAPR says "no longer available" for the FatPPS. I poked John. He was going to see if they could build another batch. -- These are my opinions, not necessarily my employer's. I hate spam. _______________________________________________ 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.