Use limit test and ratio measurements on the Agilent 53100-series counters when two signals drift more than 10% from each other.
Video: http://www.youtube.com/watch?v=lv66JBPiht4
For more information:
http://www.home.agilent.com/agilent/facet.jspx?&cc=US&lc=eng&k=53131&sm=g
http://www.home.agilent.com/agilent/facet.jspx?&cc=US&lc=eng&k=53132&sm=g
http://www.home.agilent.com/agilent/facet.jspx?&cc=US&lc=eng&k=53181&sm=g
Video: http://www.youtube.com/watch?v=lv66JBPiht4
For more information:
http://www.home.agilent.com/agilent/facet.jspx?&cc=US&lc=eng&k=53131&sm=g
http://www.home.agilent.com/agilent/facet.jspx?&cc=US&lc=eng&k=53132&sm=g
http://www.home.agilent.com/agilent/facet.jspx?&cc=US&lc=eng&k=53181&sm=g