Vacuum Tube Voltmeter 400 HR

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

  • Year
  • 1957 ?
  • Category
  • Service- or Lab Equipment
  • Radiomuseum.org ID
  • 129840

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

 Technical Specifications

  • Number of Tubes
  • 8
  • Wave bands
  • - without
  • Power type and voltage
  • Alternating Current supply (AC) / 115; 230 Volt
  • Loudspeaker
  • - - No sound reproduction output.
  • Material
  • Metal case
  • from Radiomuseum.org
  • Model: Vacuum Tube Voltmeter 400 HR - Hewlett-Packard, HP; Palo Alto
  • Shape
  • Rack
  • Dimensions (WHD)
  • 19 x 7 x 10.8 inch / 483 x 178 x 274 mm
  • Notes
  • Model 400H has a 5" indicating meter with mirror scale and measures voltages from 0.1 mv to 300 volts. The high input resistance of 10 megohms effectively minimizes loading to circuits under test. A highly stabilized amplifier with 56 db feedback provides exceptional long term stability; even line voltage changes of *lo% cause negligible variations. Readings are direct in volts or db. Operation is extremely simple; input voltages up to 600 volts peak will not damage the instrument. The instrument is of highest quality construction throughout, and is available either in the lightweight, rugged -hp- portable cabinet or for rack mounting.
  • Net weight (2.2 lb = 1 kg)
  • 9.5 kg / 20 lb 14.8 oz (20.925 lb)
  • Source of data
  • - - Data from my own collection
  • Mentioned in
  • -- Original-techn. papers.
  • Literature/Schematics (1)
  • HP Katalog 1969
  • Author
  • Model page created by Sven Hoffmann. See "Data change" for further contributors.

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