Millivoltmeter LE.45A

Hatfield Instruments Ltd.; Plymouth, Devonshire

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  • Year
  • 1954 ?
  • Category
  • Service- or Lab Equipment
  • Radiomuseum.org ID
  • 353795

 Technical Specifications

  • Number of Tubes
  • 3
  • Valves / Tubes
  • Wave bands
  • - without
  • Power type and voltage
  • Alternating Current supply (AC)
  • Loudspeaker
  • - - No sound reproduction output.
  • Material
  • Metal case
  • from Radiomuseum.org
  • Model: Millivoltmeter LE.45A - Hatfield Instruments Ltd.;
  • Shape
  • Tablemodel, with any shape - general.
  • Notes

  • 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.

  • Mentioned in
  • -- Original prospect or advert (Electronic Engineering, June 1954, Page 101)
  • Author
  • Model page created by Pier Antonio Aluffi. See "Data change" for further contributors.

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