Frequency-Period Meter 9520

Racal Engineering / Instruments / Electronics Ltd., Bracknell

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  • Year
  • 1980 ??
  • Category
  • Service- or Lab Equipment
  • Radiomuseum.org ID
  • 239423

 Technical Specifications

  • Number of Tubes
  • 4
  • Number of Transistors
  • Semiconductors present.
  • Semiconductors
  • Wave bands
  • - without
  • Power type and voltage
  • Alternating Current supply (AC)
  • Loudspeaker
  • - - No sound reproduction output.
  • Material
  • Metal case
  • from Radiomuseum.org
  • Model: Frequency-Period Meter 9520 - Racal Engineering /
  • Shape
  • Tablemodel without push buttons, Mantel/Midget/Compact up to 14
  • Notes

  • Measures Frequency or Period with four ranges

    Frequency:   x1, x10 ,x100 ,x1000 Hz
    Period:    x0,1, x1, x10, x100 μs

    The test button delivers a 1000 Hz signal derived from the internal frequency reference to the counter.

    Four digit Nixie tube display. Each digit is a separate module with:

    •     A ITT GN13A nixie tube,
    •     Mullard  FJJ131 (7490) decade counter,
    •     Mullard FJH141 (7400) quad NAND port,
    •     10 off ZTH342 transistors to drive the cathodes,
    •     A BC109 transistor, a silicon diode and some resistors.

    About 4 to 6 transistors and many ICs on main board so about 50 transistors. Reference crystal in glass bulb.

    Aluminimum carrying handle but AC mains only.

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The model Frequency-Period Meter is part of the collections of the following members.

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