Logarithmic Electrometer

Morris, J.M.

Savannah River Site (S.C.)

关键词: Electrometers;    Design;    Operation;    Electric Currents;    Power Range;   

DOI  :  10.2172/780114
RP-ID  :  DPEX-R30
RP-ID  :  780114

美国|英语

来源: UNT Digital Library

【 摘 要 】

This report describes the development and design details of an instrument that measures current in the range 10-6 to 10-13 a. and indicates or records this current on a single logarithmic scale. It is frequently desirable to measure a wide range of low current values without range switching. Since no instrument with such characteristics is commercially available, this study was made to determine whether or not the Beckman Model V Micromicroammeter could be modified to provide a logarithmic response. The feasibility of operating this instrument over six decades of input current has been demonstrated. As many as seven decades can be accommodated if a slight non-linearity in the lowest decade is tolerable. This non-linearity is insignificant in most applications. Fewer decades with increased readability and precision can also be obtained.