Digital-Frequency-Counter IM-2420 / SM-2420

Heathkit (Brand), Heath Co.; Benton Harbor (MI)

  • Year
  • 1980
  • Category
  • Service- or Lab Equipment
  • Radiomuseum.org ID
  • 203607
    • alternative name: Heath Company

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

 Technical Specifications

  • Number of Transistors
  • Semiconductors present.
  • Semiconductors
  • Wave bands
  • - without
  • Power type and voltage
  • Alternating Current supply (AC) / 120/240 Volt
  • Loudspeaker
  • - - No sound reproduction output.
  • Material
  • Metal case
  • from Radiomuseum.org
  • Model: Digital-Frequency-Counter IM-2420 / SM-2420 - Heathkit Brand, Heath Co.;
  • Shape
  • Tablemodel, with any shape - general.
  • Dimensions (WHD)
  • 254 x 108 x 318 mm / 10 x 4.3 x 12.5 inch
  • Notes
  • Frequency counter 5 Hz - 512 MHz. In the Period operating mode, the cycle time is measured in seconds; in the Ratio B/A position, the frequency difference between two input frequencies is measured. The proportionally controlled quartz furnace keeps the internal quartz base extremely accurate - 0.1 ppm per year. Four gate opening times enable the desired measurement of UHF signals.

    The kit version of this counter is labeled as Heathkit model IM-2420.  The factory built version is labeled as Heath/Zenith and the model number is SM-2420.   The SM-2420 price in 1980 was $300.

  • Net weight (2.2 lb = 1 kg)
  • 6.5 lb (6 lb 8 oz) / 2.951 kg
  • Price in first year of sale
  • 240.00 USD
  • Mentioned in
  • Heathkit Winter 1981 catalog (copyright 1980)
  • Literature/Schematics (1)
  • Heath-Zenith ad in Radio-Electronics 12-1980

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The model Digital-Frequency-Counter is part of the collections of the following members.

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