FS clock errors

If the FS is complaining frequency of a formatter to FS time difference > 0.5s, it may be necessary to recalibrate the drift rate

The procedure is outlined in /usr2/fs/misc/fstime.txt The guts of the procedure is:

1. Ordered List Item Make sure there is a “sy=run setcl &” in the “initi” procedure of

the “station” procedure library. It should go as early as possible

 in the procedure.

- Make sure there is a “sy=run setcl adapt &” in the “midob”

 procedure in "station".

- Set-up the “time.ctl” file with the following steps. Please note

 that this procedure should be repeated whenever you change FS
 computers or upgrade kernels.  Another case where you should redo
 this step is if the crystal has either because of aging or other
 reasons, like replacement, changed significantly in rate.

1. Put the following line in your “time.ctl” file as the only

non-comment line:

      0.000 0.010 rate

 B. Start the FS

 C. Execute the SNAP command: "sy=run setcl offset &"

 D. Leave the computer running for about one hour.  You can start
    and stop the FS, login and logout as many times as you wish.
    Just don't reboot the computer.

 E. Execute the SNAP command: "sy=run setcl rate &"

 F. Execute the SNAP command: "sy=run setcl save &"

 G. At a shell prompt execute:

      cd /usr2/control
      mv time.new time.ctl

 As long as there were no communication or permission errors, your
 "time.ctl" file should be updated with a reasonable rate value.

***

We can perform this after the observation, and it should be fixed. Until we fix it properly by getting a permanent machine to replace the dead hobart.

T

On Tue, 2010-08-10 at 09:45 +1000, Brett Reid wrote:

> Hi Guys,
> We are running a different pcfs computer.
> On the new system we are getting error such as below.
>
> 2010.221.23:15:39.44?ERROR sc -13 setcl: formatter to FS time
> difference 0.5 seconds or greater
> 2010.221.23:17:44.13?ERROR sc -13 setcl: formatter to FS time
> difference 0.5 seconds or greater
> 2010.221.23:19:45.09?ERROR sc -13 setcl: formatter to FS time
> difference 0.5 seconds or greater
>
> Running sy=run setcl offset produces the following:
>
> 2010.221.23:19:45.09?ERROR sc -13 setcl: formatter to FS time
> difference 0.5 seconds or greater
> 2010.221.23:20:11.20;sy=run setcl offset
> 2010.221.23:20:11.26#setcl#time/1757666966,0,2010,221,23,20,11.09,-4.259,0.789,-11
> 2010.221.23:20:11.26#setcl#model/old,1263819362,-2043,1757382975,-0.778,1.543,rate,0,unknown,11,0
> 2010.221.23:20:11.15#setcl#model/new,1263819362,-2057,1757666966,-0.778,1.543,rate,0
>
>
> However the problem is not permanently fixed.
>
> We have seen this before. I just cannot remember how to fix it
> permanently. Any ideas greatly appreciated.
>
> We are running R1433 currently.
>
> Regards,
> Brett
>
>

– ############################################## Timothy Hoban VLBI Developer http://www-ra.phys.utas.edu.au/auscope School of Maths and Physics University of Tasmania ############################################## Guilt should be a momentary pang to spur one into corrective action. Anything longer is wasted, and worse, selfish. - Mark Belletini