VHF Frequency Meter FM-3 Series

Wayne Kerr; New Malden, England

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  • Year
  • 1962 ?
  • Category
  • Service- or Lab Equipment
  • Radiomuseum.org ID
  • 330267

Click on the schematic thumbnail to request the schematic as a free document.

 Technical Specifications

  • Wave bands
  • Wave Bands given in the notes.
  • Power type and voltage
  • Batteries / addl. power jack
  • Loudspeaker
  • - - No sound reproduction output.
  • Material
  • Metal case
  • from Radiomuseum.org
  • Model: VHF Frequency Meter FM-3 Series - Wayne Kerr; New Malden,
  • Shape
  • Tablemodel, with any shape - general.
  • Notes

  • The Wayne Kerr-Gertsch frequency meter type FM-3 has a guaranteed accuracy of ten parts per million when used to measure or generate any frequency in the range 20MHz to 1,000MHz. This accuracy applies at any constant temperature between 20 and 30°C; over the range 15 to 45°C the frequency accuracy is ±0.0025%. This high level of accuracy is achieved by combining the multiple oscillator principle with a unique lock-in circuit. The basic accuracy of the Wayne Kerr-Gertsch FM-3 equipment is determined by a 1MHz crystal which can be adjusted for alignment with an external frequency standard. This alignment can be effected without removing the instrument from its case.
    The FM-3 is a harmonic instrument with a fundamental range of 20 to 40MHz. Frequencies up to and beyond 1,000MHz can be measured and generated by means of harmonics of the fundamental range. Amplitude tends to fall above 1,000MHz, but measurements have been obtained as high as 2,400MHz. Frequencies below 20MHz can be measured by using a harmonic of the unknown frequency. The frequency is read directly from a dial on the meter, so that reference to a calibration book is unnecessary.

    Three models only different for power supply:
    FM-3  is a portable version powered by batteries.
    FM-3/PS-3 is powered by the PS-3 regulated power supply instead of batteries.
    FM-3R is a rack version with PS-3 power supply to be inserted in a 19 x 8¾ inch panel.

  • Mentioned in
  • Electronic Engineering, volume 34 year 1962
  • Author
  • Model page created by Pier Antonio Aluffi. See "Data change" for further contributors.

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