Publication Date:
2011-08-16
Description:
High precision frequency measurements with various integration times can be made with conventional counters by using variable gate times. The Hewlett-Packard (HP) computing counter allows such measurements over a wide range of frequencies and measurement times. This instrument can also convert period measurements into frequency by means of its arithmetic capabilities: The program library contains programs to facilitate frequency stability measurements in the most direct and convenient way. This method was used as the basis for all time scale computations, until requirements for highest resolution justified the development of an automatic data acquisition system. The phase measurements are now being made with the HP computing counter (with time interval plug-in unit) under program control from the HP System Programmer.
Keywords:
INSTRUMENTATION AND PHOTOGRAPHY
Type:
NASA. Goddard Space Flight Center Proc. of the 4th Precise Time and Time Interval Planning Meeting; p 152-167
Format:
text
