Wow & Flutter Meter A248 1M70579

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

Daten
Forum
Bilder
Sammlungen

  • Jahr
  • 1979
  • Kategorie
  • Service- oder Labor-Ausrüstung
  • Radiomuseum.org ID
  • 314512

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 Technische Daten

  • Anzahl Transistoren
  • Halbleiter vorhanden.
  • Halbleiter
  • Wellenbereiche
  • - ohne
  • Betriebsart / Volt
  • Wechselstromspeisung / 100-132V, 200-264 Volt
  • Lautsprecher
  • - - Kein Ausgang für Schallwiedergabe.
  • Material
  • Metallausführung
  • von Radiomuseum.org
  • Modell: Wow & Flutter Meter A248 1M70579 - Amalgamated Wireless
  • Form
  • Tischgerät, Truhenform, meist mit Deckel (NICHT Schrägpult).
  • Abmessungen (BHT)
  • 269 x 99 x 273 mm / 10.6 x 3.9 x 10.7 inch
  • Bemerkung

  • 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.

  • Nettogewicht
  • 2.1 kg / 4 lb 10 oz (4.626 lb)
  • Literaturnachweis
  • - - Manufacturers Literature (AWA Handbook 79579R, Issue 1)
  • Autor
  • Modellseite von Gary Cowans angelegt. Siehe bei "Änderungsvorschlag" für weitere Mitarbeit.

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