CEPREI Saibao of China stepped into the precision metrology instrument industry in 2001 and has continuously focused on the R&D and manufacturing of high-end precision metrology instruments. Driven by persistent dedication to developing high-end metrology equipment, years of intensive research, and experience accumulated through multiple product iterations, the CEPREI Saibao R&D team has achieved a number of technological breakthroughs covering high-stability closed-loop feedback current, high-stability AC/DC voltage division, wideband linear amplification, digital signal synthesis, active simulated resistance, high-precision phase synchronization and other core technologies, launching the SB75XX series multi-function standard sources. The SB75XX series multi-function standard sources stand as an important milestone in the development journey of CEPREI Saibao.