ePT-100 time test set is a portable time test instrument designed to provide PTP, NTP, IRIG-B, PPS, pulse frequency, pulse width, SOE, idle contact timing test and provide PPS, IRIG-B, NTP, PTP(OC/TC/BC, E2E/P2P) time output. ePT-100 time test set supports IEC 61850 SV/GOOSE message time performance test to get message delay over Ethernet. ePT-100 time test set has high precision measurement reference clock which can be synchronized to absolute time such as GPS, BDS etc. and relevant time such as PTP, IRIG-B, serial time etc. It is equipped with Rubidium for stable hold feature. ePT-100 time test set provides network protocol capturing and analyzing features for user to solve all kinds of Ethernet communication issues. All captured messages with high precision time tag are saved as standard format files such as PCAP, CSV etc. ePT-100 time test set with more functions is easy to take because of its small size and light weight. The built-in battery makes it work without external power supply. ePT-100 time test set is designed for any time synchronization system and IEC 61850 system. It is a useful auxiliary tool to help user do more IEEE 1588 (PTP) and IEC 61850 researches. ePT-100 time test set has HMI to help user easier to analyze data by trend, histogram etc. It supports internal and external storage. All timing test data are saved into a standard file which are easier to reload and analyze manually. All screens also can be captured manually. All test result statistics can be shown as average, offset value etc.