CONTENTS

 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 input 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 ITU-T and North American weightings
Annex B – Level and noise measurements at interfaces with complex impedances
        B.1     Level measurements at interfaces with real impedance – General considerations
        B.2     Level measurements at interfaces with complex impedances
                  B.2.1     Level meters with complex input impedances
                  B.2.2     Psophometers with complex input impedances
        B.3     Conclusion
References