Quasi-balance resistance bridge

A kind of quasi-balance resistance bridge based on electronic inductive voltage divider(EIVD) has been constructed. EIVD provides high accurate voltage ratios at wide frequency range from 20Hz to 10kHz. Wagner network with a follower makes voltage ratio unaffected by internal loading of ratio winding. Amplifiers are used to eliminate voltage drop on the connecting cable of resistors. The bridge can measure resistance from 1 Ω to 1M Ω with a optimal uncertainty of 2×10
^-7
for resistance and 5 ns for time constant at 1kHz.