• Country
• Denmark

• Manufacturer / Brand
• Brüel & Kjær; Nærum

• Year
• 1973 ??

• Category
• Service- or Lab Equipment

• Radiomuseum.org ID
• 316538

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

• Number of Transistors
• 6

• Semiconductors
• BCW62 BCW62 BC107 BCW82 BCW82 BCW82

• Main principle
• Audio-Amplification

• Wave bands
• - without

• Power type and voltage
• Dry Batteries / 1 x 9 Volt

• Loudspeaker
• -Loudspeaker incorporated, but system not known.

• Material
• Metal case

• from Radiomuseum.org
• Model: Sound Level Calibrator - Kalibrator für Schallpegelmesser 4230 - Brüel & Kjær; Nærum

• Shape
• Very small Portable or Pocket-Set (Handheld) < 8 inch.

• Dimensions (WHD)
• 44 x 115 x 44 mm / 1.7 x 4.5 x 1.7 inch

• Notes

• Brüel & Kjær Sound Level Calibrator Type 4230, 94 dB - 1000 Hz
  Built-in loudspeaker: piezoelectric driver element

  This calibrator gives a pressure calibration directly for sound level meter calibration (free-field calibration) adjust to 93.6 dB for 1" and 93.8 dB for ½" microphones.

  Replace battery if signal does not last for at least a few seconds after contact is released.

  Kalibrator für Schallpegelmesser mit 1 Zoll und ½ Zoll Mikrofon.

• Net weight (2.2 lb = 1 kg)
• 0.260 kg / 0 lb 9.2 oz (0.573 lb)

• Author
• Model page created by Reinhard Bode. See "Data change" for further contributors.

• Other Models

• Here you find 63 models, 61 with images and 16 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Brüel & Kjær; Nærum