Coaxial Frequency Meter 537A

Hewlett-Packard, (HP); Palo Alto, CA

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  • Year
  • 1972
  • Category
  • Service- or Lab Equipment
  • Radiomuseum.org ID
  • 338595

 Technical Specifications

  • Main principle
  • RF-Circuit or wave trap (separate, can also be an antenna with amp.)
  • Wave bands
  • Wave Bands given in the notes.
  • Power type and voltage
  • No Power needed
  • Loudspeaker
  • - - No sound reproduction output.
  • Material
  • Metal case
  • from Radiomuseum.org
  • Model: Coaxial Frequency Meter 537A - Hewlett-Packard, HP; Palo Alto
  • Shape
  • Miscellaneous shapes - described under notes.
  • Dimensions (WHD)
  • 118 x 146 x 89 mm / 4.6 x 5.7 x 3.5 inch
  • Notes

  • The Hewlett Packard, 537A coaxial frequency meter is used for measuring frequency in the 0.96 to 12.4 GHz range.

    Accuracy is obtained from the spiral scale.

    The meter contains a coaxial line coupled to a quarter-wavelength coaxial resonant cavity loaded with capacitance at the bottom of the band. At resonance, power is absorbed by the cavity, producing a dip in the coaxial line power.
    The frequency at which this dip occurs is read directly from the dial in gigahertz.

    Tuning is accomplished by moving a piston. A precision lead screw, which is spring-loaded to prevent backlash, is used to position the piston in the cavity.

    Due to the design of the cavity, its electrical length is extended at lower frequencies, and there are no spurious modes.

    Specifications

    Frequency range;   3.7 to 12.4 GHz
    Reflection coefficient off-resonance: 0.33 (2.0 SWR, 9.5 dB return loss)
    Calibration increments: 10 MHz
    Dip at resonance:

    1 dB (minimum)
    Dial accuracy:   ±0.1%
    Overall Accuracy:

    ±0.17% which includes an allowance of ±0.02% for 0 to 100% relative humidity, ±0.0016 per °C from 13 to 33 °C & 0.03% backlash.

     

  • Net weight (2.2 lb = 1 kg)
  • 3.5 lb (3 lb 8 oz) / 1.589 kg
  • Mentioned in
  • - - Manufacturers Literature (536A / 537A Coaxial Frequency Meter Operating Note. No. 00536-90001)
  • Author
  • Model page created by Gary Cowans. See "Data change" for further contributors.

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