A Feedback Micromicroammeter
- 1 June 1939
- journal article
- research article
- Published by AIP Publishing in Review of Scientific Instruments
- Vol. 10 (6) , 181-183
- https://doi.org/10.1063/1.1751521
Abstract
A two‐stage direct‐coupled amplifier circuit with negative feedback which can be used for measuring small direct currents is described. The circuit details are given for a multi‐range micromicroammeter which is compact and stable and operates from a.c. power. Through reduction of grid current in the input tube, which is a standard receiving type, it is possible to realize a high sensitivity approaching that of amplifiers using special electrometer tubes.Keywords
This publication has 1 reference indexed in Scilit:
- An Improved Vacuum Tube MicroammeterReview of Scientific Instruments, 1936