• Country
• United States of America (USA)

• Manufacturer / Brand
• Hewlett-Packard, (HP); Palo Alto, CA

• Year
• 1966

• Category
• Service- or Lab Equipment

• Radiomuseum.org ID
• 189255

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

• Number of Transistors
• 17

• Semiconductors

• Wave bands
• - without

• Power type and voltage
• Alternating Current supply (AC) / 220 Volt

• Loudspeaker
• - - No sound reproduction output.

• Material
• Metal case

• from Radiomuseum.org
• Model: AC dB meter 400FL - Hewlett-Packard, HP; Palo Alto

• Shape
• Tablemodel, with any shape - general.

• Dimensions (WHD)
• 130 x 165 x 279 mm / 5.1 x 6.5 x 11 inch

• Notes
• The HP model 400 FL is a versatile AC dB meter. It can be used as a wideband amplifier too. The 400FL has a linear dB scale with a logarithmic AC scale below. Frequency range from 20 Hz to 4 MHz with accuracy from 1% to 4%. Voltage range from 100 µV to 300 V full scale. Imput impedance 10 megaohms shunted by 25 pF.

• Net weight (2.2 lb = 1 kg)
• 6 lb (6 lb 0 oz) / 2.724 kg

• Source of data
• -- Original-techn. papers.

• Author
• Model page created by Emilio Focosi. See "Data change" for further contributors.

• Other Models

• Here you find 391 models, 359 with images and 138 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Hewlett-Packard, (HP); Palo Alto, CA