PSN-L Email List Message
Subject: Re: computer time sync
From: "Larry Cochrane" lcochrane@..............
Date: Thu, 15 Apr 2004 01:20:25 -0700
The time stamping of the data is preformed on the A/D board not on the
computer running WinSDR. If you want very accurate timing, down to a few
milliseconds, you will need to use GPS. The GPS receiver connects up to the
A/D board so it can uses the highly accuracy 1 pulse per second signal
generated by the GPS receiver to time stamp the data. See
http://www.seismicnet.com/gps/index.html for a GPS timing system that will
work with my A/D board.
You can use the computer running WinSDR to supply timing information to the
A/D board. In the WinSDR system settings dialog box select "Local" timing
reference type. When this timing mode is selected the A/D board interrogates
the computer for the current time of day.
I found that the NT port of NTP works very well under Win2K. If you have a
DSL line, and can find a good time server that is near by, you can achieve a
timing accuracy of around 10 to 20 milliseconds. While searching around I
found this Windows port of NTP:
Redwood City, PSN
----- Original Message -----
Cc: "Kevin Bach"
Sent: Wednesday, April 14, 2004 6:52 PM
Subject: computer time sync
> I am using Dimension 4 to sync the time on the computer that runs only
> WinSDR. My time seems to vary. In an event yesterday, St. Louis network
> my computer were 20 seconds off for the same event. Any suggestions?
> Public Seismic Network Mailing List (PSN-L)
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