• Country
• United States of America (USA)

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

• Year
• 1980

• Category
• Service- or Lab Equipment

• Radiomuseum.org ID
• 189247

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

• Number of Transistors
• 25

• 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 400EL - Hewlett-Packard, HP; Palo Alto

• Shape
• Tablemodel, with any shape - general.

• Dimensions (WHD)
• 130 x 165 x 280 mm / 5.1 x 6.5 x 11 inch

• Notes
• The HP models 400EL is a versatile AC dB meter with linear dB scale and logarithmic AC voltmeter scale underneath. Voltage range 1 mV full scale to 300 V full scale in 12 ranges. Frequency range from 10 Hz to 10 MHz. Imput impedance is 10 megaohms shunted by 25 pF. External battery operation with positive and negative voltages between 35V and 55V.

• 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