Wow & Flutter Meter A248 1M70579

Amalgamated Wireless (Australasia) Ltd. (AWA); Sydney

Données
Forum
Images
Collections

  • Année
  • 1979
  • Catégorie
  • Appareils de mesure et de dépannage (matériel de labo)
  • Radiomuseum.org ID
  • 314512

Cliquez sur la vignette du schéma pour le demander en tant que document gratuit.

 Spécifications techniques

  • No. de transistors
  • Semi-conducteurs présents
  • Semi-conducteurs
  • Gammes d'ondes
  • - sans
  • Tension / type courant
  • Alimentation Courant Alternatif (CA) / 100-132V, 200-264 Volt
  • Haut-parleur
  • - - Pas de sortie basse fréquence
  • Matière
  • Boitier métallique
  • De Radiomuseum.org
  • Modèle: Wow & Flutter Meter A248 1M70579 - Amalgamated Wireless
  • Forme
  • Modèle de table boitier avec vouvercle
  • Dimensions (LHP)
  • 269 x 99 x 273 mm / 10.6 x 3.9 x 10.7 inch
  • Remarques

  • The AWA  Wow & Flutter Meter A248 is designed to measure speed variations in all types of Consumer and Studio reproduction equipment, both balanced and unbalanced.

    This instrument measures Drift, Wow and Flutter.  Drift is long term variations in speed while Wow and Flutter are short term variations with Wow being variations below 6 Hz and Flutter above 6 Hz.

    The A248 has a "Weighted Total Wow & Flutter" to DIN, IEC, IEEE and ANSI Standards which gives the relative disturbing effect of the Wow & Flutter to the listener.

    Also "Unweighted Total Wow & Flutter" measurements may be made for comparison with results made by equipment manufactured to old standards. This measurement, together with the separate Wow, Flutter measurements provides an invaluable aid to the service technician in determining the area of degradation of performance.

    A pre-recorded disc or tape may be used to measure Drift, Wow & Flutter or if not available the 3150 Hz tone from the A248 may be recorded onto tape. However, results may vary from twice the actual Wow & Flutter to almost complete cancellation due to arithmetic addition of the variations. This may be detected by causing tape slippage on playback and noting the change in readings.

    DESCRIPTION

    The A248 provides a 3150 Hz tone with very high frequency stability from a balanced 600Ω source at +8 dBm. This tone is used internally on the "Drift Cal" mode and may also be used for recording the tone onto tape.

    A CMOS Phase Locked Loop is used to lock onto the incoming tone in the A248 and provides a demodulated output to give a precise indication of variations in the reproducing equipment speed.

    The input is balanced with an input impedance greater than 300 kΩ.

    A green L.E.D. on the A248 is used to indicate when a tone is of sufficient level to operate the instrument.

    The A248 has internal filters to allow the measurement of Wow, Flutter, Unweighted Wow & Flutter and Weighted Wow & Flutter (to DIN, IEC, IEEE, ANSI Standards).

    A "Monitor Output is provided to enable monitoring of the Wow & Flutter by CRO.

  • Poids net
  • 2.1 kg / 4 lb 10 oz (4.626 lb)
  • Littérature
  • - - Manufacturers Literature (AWA Handbook 79579R, Issue 1)
  • Auteur
  • Modèle crée par Gary Cowans. Voir les propositions de modification pour les contributeurs supplémentaires.

 Collections | Musées | Littérature

 Forum