Impedance Bridge

Last updated: January 6, 2014

An impedance bridge based on the hardware from Ref 1.

The supply voltages are generated from a single Li-ion cell with a small DC-DC converter.

Software

Because the available software is Windows based and did not run smoothly with Wine, a gnuradio python script is used do do the measurements. The script is based on a script from GNU Radio Tutorilas Part 5 (local copy in the archive).

Both C and L values are displayed. Ofcourse only the positive one is valid ...

References:

An LMS Impedance Bridge (Local copy)
A real time FFT-based impedance meter with bias compensation (Local copy)

Downloads

Archive containing the Xcircuit files (encapsulated postscript) and the GNU radio .grc file.