computer time accuracy !!!

[h.v]

i have a GPS NTP Time server synchronizing my PC.
HOW am i able to compare 1PPS of the GPS receiver with clock pulse of my PC to see how much accurately it is synced to the GPS time?(with an oscilloscope maybe!)

 

[klystron]

How accurate do you want to read the time difference?

 

[h.v]

How accurate do you want to read the time difference?

thanks for the answer:grin:
tens of nanoseconds!!

 

[klystron]

That is a very tight specification See GPS Time Server
How to intend to read the time data from the modem ? Serial port , speed ??

 

[h.v]

GPS NTP server provides one pulse per second (1pps) and also it send Network Time Protocol (NTP) packets (via Ethernet) to the PC to sync it. the time pulse can be seen on ocs but how to see time pulse of pc on it to !! there should be a way to see computers clock on the osc , shouln't it?