ITU-T RECOMMENDATION O.41 – PSOPHOMETER FOR USE ON TELEPHONE-TYPE CIRCUITS
FOREWORD
CONTENTS
Abstract
Keywords
1 Introduction
2 General
3 Specific requirements
    3.1 Input impedance
        3.1.1 Terminating mode
        3.1.2 Bridging mode
        3.1.3 Complex impedances
    3.2 Longitudinal losses
    3.3 Measuring range
    3.4 Calibration accuracy at 800 Hz
    3.5 Relative gain versus frequency (frequency weighting)
        3.5.1 Optional frequency characteristic
    3.6 Detector circuit characteristics
        3.6.1 Detector circuitry tests
        3.6.2 Turnover
    3.7 Detector and display dynamics (measurement averaging time)
        3.7.1 Instrumentation with continuous signal monitoring
        3.7.2 Instrumentation with non-continuous signal monitoring
        3.7.3 Damped response
    3.8 Linearity
    3.9 Output indicator
    3.10 Operating environment
        3.10.1 Immunity to electromagnetic fields
Annex A – Comparison of CCITT and North American weightings
References