• Anno
  • 1954 ?
  • Categoria
  • Strumento da laboratorio
  • Radiomuseum.org ID
  • 353795

 Specifiche tecniche

  • Numero di tubi
  • 3
  • Valvole
  • Gamme d'onda
  • - senza
  • Tensioni di funzionamento
  • Alimentazione a corrente alternata (CA)
  • Altoparlante
  • - - Nessuna uscita audio.
  • Materiali
  • Mobile di metallo
  • Radiomuseum.org
  • Modello: Millivoltmeter LE.45A - Hatfield Instruments Ltd.;
  • Forma
  • Soprammobile con qualsiasi forma (non saputo).
  • Annotazioni
  • 8 Inch Scale Millivoltmeter

    Outstanding features:

    • 8 in. illuminated mirror scale.
    • Wide range: 100 μV to 100 V in ten ranges. First range 0-3 mV. Ranges in 10 dB steps.
    • No Zero Drift
    • Frequency range: 20 Hz to 300 kHz. Accuracy ± 3%. Up to 800 kHz at lower accuracy.
    • High input impedance: 12 MΩ.
    • Mains operated.

    The ten voltage ranges are in 10 dB steps. 
    An additional decibel scale is provided which gives an overall range of -70 to +42 dB with a reference level of 1 mV into 600 Ω. 
    The circuit comprises an input cathode follower, followed by a three-valve amplifier with negative feedback. 
    The H.T. supply is electronally stabilized and the instrument is substantially independent of changes in the supply.

  • Bibliografia
  • -- Original prospect or advert (Electronic Engineering, June 1954, Page 101)
  • Autore
  • Modello inviato da Pier Antonio Aluffi. Utilizzare "Proponi modifica" per inviare ulteriori dati.

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