• CCITT Rec. O.41 (11/1988) – PSOPHOMETER FOR USE ON TELEPHONE-TYPE CIRCUITS
  • 1 Introduction
  • 2 General
  • 3 Specific requirements
    • 3.1 Input impedance
    • 3.2 Longitudinal losses
    • 3.3 Measuring range
    • 3.4 Calibration accuracy at 800 Hz
    • 3.5 Relative gain versus frequency (frequency weighting)
    • 3.6 Detector circuit characteristics
    • 3.7 Detector and display dynamics (measurement averaging time)
    • 3.8 Linearity
    • 3.9 Output indicator
    • 3.10 Operating environment
  • ANNEX A (to Recommendation O.41) Comparison of CCITT and North American weightings