Equal-precision frequency testing system based on FPGA and design method thereof

• Main Authors: LI XIAOQIANG, ZHANG HAITAO, ZHANG LIANGLIANG, YE YUCHENG
• Format: Patent
• Language: Chinese; English
• Published: 04.06.2014
• Subjects: MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

The invention discloses an equal-precision frequency testing system and method based on an FPGA. According to the system, frequency demultiplication is carried out on outer standard clock signals, a preset gate signal is obtained, and then an actual gate signal is obtained. The rising edge of an outer signal to be tested and the rising edge of the standard clock signal are counted so that the periodicity of the outer signal to be tested and the standard clock signal in the actual gate signal can be obtained. The frequency of the signal to be tested is obtained according to the obtained periodicity and the frequency of the standard clock signal, and finally the frequency of the signal to be tested is sent to a nixie tube to be displayed. Through the method, high frequency measurement precision can be obtained, and the measurement precision of the frequency is almost equal.