# Results of calibrating the GetSecs timing routine on PC.

**URL:** <https://psychtoolbox.discourse.group/t/results-of-calibrating-the-getsecs-timing-routine-on-pc/1227>\
**Category:** Uncategorized\
**Created:** [October 26, 2000, 5:14pm UTC](https://psychtoolbox.discourse.group/t/results-of-calibrating-the-getsecs-timing-routine-on-pc/1227 "2000-10-26T17:14:10Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Allen\_Ingling](https://avatars.discourse-cdn.com/v4/letter/a/a183cd/32.png) [@Allen\_Ingling](https://psychtoolbox.discourse.group/u/Allen_Ingling)\
**Post date:** [October 26, 2000, 5:14pm UTC](https://psychtoolbox.discourse.group/t/results-of-calibrating-the-getsecs-timing-routine-on-pc/1227/1 "2000-10-26T17:14:10Z")

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Hi all,  
  
Recently we performed a calibration of the PC's GetSecs timing routine   
in our lab. We programmed Matlab to start the GetSecs timer and   
generate 1000Hz tone through our TDT system. The tone was also routed   
through a frequency counter (calibrared). Pressing a key stopped the   
timer and interrupted the tone. The reading on the frequency counter   
is the objective measure of time passed since the initiation of the   
tone. Comparing the timer and the counter reading (500 observations),   
we got a correlation of 1 and an average deviation of 1.6 ms depending   
whether the timer or tone were activated first.  
  
Best,  
  
Arieh Yoav  
J. B. Pierce Laboratory