APO Multimeter No. 2A

Master Instruments Pty. Ltd., Sydney

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  • Year
  • 1963 ??
  • Category
  • Service- or Lab Equipment
  • Radiomuseum.org ID
  • 348348

 Technical Specifications

  • Wave bands
  • - without
  • Power type and voltage
  • Dry Batteries / B121: 1 x 15, D: 1 x 1.5 Volt
  • Loudspeaker
  • - - No sound reproduction output.
  • Material
  • Plastics (no bakelite or catalin)
  • from Radiomuseum.org
  • Model: APO Multimeter No. 2A - Master Instruments Pty. Ltd.,
  • Shape
  • Portable set > 8 inch (also usable without mains)
  • Notes

  • The APO No. 2A is a rugged instrument designed for general-purpose field use by telecommunications technicians in the Australian Post Office (Telecom Australia) and military services.

    The meter has a basic internal resistance on voltage ranges of 1000 Ohms/V and the stated accuracy is better than 1.5% on DC voltage and 2% on AC voltage.

     A single range switch covers AC and DC voltages to 1000 V and DC current from 1 mA to 10 A.

    The front panel includes a separate probe socket to allow measuring the internal resistance of single 1.5 V cells which were used as local battery microphone supplies on magneto telephone services in country regions and military field telephones.

    The internal batteries consist of a single 1.5v cell for the Ohms x1, x10, and x100 ranges and a 15V (Eveready 411 or B121), battery for the Ohms x1000 range. 

    See also the later Model APO No. 3 which has an additional AC Current range.

  • Author
  • Model page created by Gary Cowans. See "Data change" for further contributors.

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