In order to improve measuring accuracy of existing Millikan oil drop experimental instrument and traditional teaching guidance mode

testing system of Millikan oil drop experiment based on field programmable gate array（ FPGA） and wireless communications is designed. This system uses FPGA to collect and store controlled voltage and falling time of oil droplet with high speed

and construct the distributed network based on Zig Bee for the test data wireless transmission. The experimental data management system based on client/server（ C/S）structure is developed

the upper PC can obtain

process

store

and display the experimental data in real time

and SQL Server database is used for data storage

and the data in the local server is synchronized to remote server. The practice proves that this system not only creates a flexible and efficient experimental teaching mode

but also average relative error of test results is less than 0. 06 %

compared with traditional oil drop instrument

the measurement accuracy is improved effectively.