For the operation and maintenance of the distribution network when no field power source exists
this paper has developed a hardware device combining ARM
DSP and FPGA
using lithium battery inside the device for the power source.This device can achieve the high precision output of the voltage and current
and so a portable distribution network tester with low power consumption and high performance is realized.The test results show that this device meets the requirements of field tests for the operation and maintenance of distribution network.