Versatile four-probe ac conductivity measurement system.
The design of a four-probe ac conductivity measurement system is described. The system is capable of making precision conductance measurements from 10(-8) to 10(-5) S at 20 to 200 Hz. Driven coaxial shields and a controlled current source are utilized to eliminate phase shift/attenuation errors, and make the measurement of conductances on a variety of materials a routine procedure requiring a minimum of operator intervention.
Phillips
T E
TE
Department of Chemistry and Material Research Center, Northwestern University, Evanston, Illinois 60201, USA.
Anderson
J R
JR
Schramm
C J
CJ
Hoffman
B M
BM