ANSI C39.4 : 1966

Applies to dc potentiometer and dc bridge types. Describes means of classification eg. exhibiting, recording, scale length, measuring circuit, performance ratings, reference operating conditions, rated operating conditions, extreme operating conditions, quantitative values covered on Detailed Requirement Sheets for each instrument. Performance based on reference operating conditions, rated operating conditions including accuracy, dead band, span step response time, and damping. Extreme operating conditions including ambient temperature, interference, position, vibration, etc. Test procedures conformity of instruments.