NF EN 61237-4 : 1998

1 General
    1.1 Scope and object
    1.2 Normative references
    1.3 Definitions
2 Manual and automatic measurements
3 Procedure of measurement
4 Environmental conditions
5 Measurements on analogue audio baseband recording
    using bias
    5.1 Reproducing performance using calibration tape
    5.2 Overall performance using reference tape
6 Measurement on analogue audio recording using
    frequency modulation (FM audio)
    6.1 Reproducing performance using calibration tape
    6.2 Overall performance using reference tape
7 Special measurements
    7.1 Measurements on FM carrier (unmodulated carrier
          and deviation)
    7.2 Measurements on AGC (amplitude characteristic;
          attack time; hold time)
    7.3 Measurements on switchable noise reduction circuits
    7.4 Measurements on non-switchable noise reduction
          systems (in combination with a non-switchable AGC)
    7.5 Polarity test
Annexes
A Method of measurement for magnetic tape flux
B Bibliography
ZA (normative) Normative references to international
   publications with their corresponding European publications

Covers methods of measurement and special test signals for analogue audio part of equipment chiefly dedicated to recording reproduction of TV signals on magnetic tape in reels or in cassettes.