In this paper, the cause, that measurement accuracy of the equal-precision frequency measurement meter is far lower than the theoretical value and it is varied with measured frequency, is analyzed. The researched results show that there is a race-hazard in the synchronous gate circuit that is used commonly and the frequency measurement precision is influenced by the resulting interference impulse. In order to solve the problem, several improved design solutions for synchronous gate circuit are brought forward. These proposed schemes are tested and the results demonstrate that there is no interference impulse. The measurement accuracy of the equal-precision frequency measurement meter with improved synchronous gate circuit is in agreement with the theoretical value very well. So the equal-precision frequency measurement can be realized.
