Integrating Digital Voltmeter LM1420

Solartron Laboratory Instruments Ltd.; Surrey

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  • Year
  • 1966 ??
  • Category
  • Service- or Lab Equipment
  • Radiomuseum.org ID
  • 339674

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)
  • Loudspeaker
  • - - No sound reproduction output.
  • Material
  • Metal case
  • from Radiomuseum.org
  • Model: Integrating Digital Voltmeter LM1420 - Solartron Laboratory
  • Shape
  • Tablemodel, with any shape - general.
  • Notes

  • The voltmeter measures the true average value of the input voltage over a fixed measuring period. This voltmeter employs an integration technique that uses voltage-to-frequency conversion.

    The coverage of this voltmeter is from 0 to 20 mV to 0 to 1 kV in 6 ranges.
    The input circuits are completely floating with an isolation impedance greater than 105 MΩ/150pF to mains earth, giving 150 dB reflection of common mode interference up to 500 V peak.

    The apparent input impedance of the voltmeter which is nominally 5,000 MΩ on the 2V range, may be adjusted to approach infinity for short-term operation.

     

  • Mentioned in
  • “Electronic Engineering”, volume 36, June 1964.
  • Author
  • Model page created by Pier Antonio Aluffi. See "Data change" for further contributors.

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