Voltmeter 400B

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

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  • Année
  • 1948
  • Catégorie
  • Appareils de mesure et de dépannage (matériel de labo)
  • Radiomuseum.org ID
  • 82823

 Spécifications techniques

  • Principe général
  • Appareillage spécial ? Renseignements souhaités SVP.
  • Tension / type courant
  • Alimentation Courant Alternatif (CA) / 115 Volt
  • Haut-parleur
  • - - Pas de sortie basse fréquence
  • Matière
  • Boitier métallique
  • De Radiomuseum.org
  • Modèle: Voltmeter 400B - Hewlett-Packard, HP; Palo Alto
  • Forme
  • Modèle de table à panneau incliné
  • Remarques
  • Info on HPs page:
    At the time of their introduction, HP voltmeters offered unprecedented reliability for their price.

    The first voltmeter, the 400A, was introduced early in 1942 after a design by Dave Packard in 1941. It was manufactured until 1958. Notable for stability (it was one of the earliest vacuum tube voltmeters to need no initial adjustment for zero and none for drift) and for wide high input impedance over 1 MHz bandwidth, the 400A became an industry classic. A key to achieving its performance was application of negative feedback in amounts then unheard of.

    The HP Model 400A vacuum tube voltmeter, a recent development of HP laboratories, possesses all the important desirable features. It is one of the best available for measurements below 1 megacycle. It is extremely easy to operate, yet its accuracy is unexcelled and it has extreme sensitivity over a wide frequency range. One of the outstanding features of the HP 400A is that the voltage indication is proportional to the average value of the full wave. This is a feature not found in most electronic meters on the market today.
  • Auteur
  • Modèle crée par Ernst Erb. Voir les propositions de modification pour les contributeurs supplémentaires.

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