[Gb-ccb] forwarded message from John Ford

[Tim Pearson]

I should try to clarify. In normal data-taking, our goal is to 
timestamp the data to at least millisecond precision, e.g., by counting 
samples from the last 1-second tick. My point about dump mode was that 
we don't *need* to timestamp every 100-ns sample to ns precision, 
although if it's easy we should do the best we can. If a dump is 
triggered by a command from the operator, then assigning a precise 
time-stamp might be difficult. The *minimal* requirement for the dump 
mode is a contiguous sequence of, say, 20K 100-ns samples, starting (or 
ending) within ~ 1s of the operator's command. If you see any need to 
synchronize the dump with some other event with high precision, then 
let me and Martin know.

- Tim

On Jan 22, 2004, at 5:02 AM, Richard Lacasse wrote:

> Tim,
>
> I wonder if at some point in time we may want to tie the data to the 
> instantaeous telescope position with higher accuracy than 1 second can 
> afford. The gbt is fairly big and floppy and we are outfitting it with 
> devices like the quadrant detector which can give an instantaneous 
> position for part of the telescope at a 10 Hz rate.
>
> Rich