Renseignements généraux

Nº de série

24979

Nº de partie

1

Nombre total de parties

2

Ou

Level recorder

Brevets

S/O

Description générale

wood casing/ metal component casings & parts, hardware/ synthetic parts/ paper chart

Dimensions

Remarque : Cette information reflète la taille générale pour l’entreposage et ne représente pas nécessairement les véritables dimensions de l’objet.

Longueur

58,0 cm

Largeur

31,0 cm

Hauteur

23,0 cm

Épaisseur

S/O

Poids

S/O

Diamètre

S/O

Volume

S/O

Lexique

Groupe

Communications

Catégorie

Équipement de service et d'essais

Sous-catégorie

S/O

Fabricant

Ou

Bruel Kjaer

Pays

Danemark

État/province

Inconnu

Ville

Copenhague

Contexte

Pays

Canada

État/province

Ontario

Période

late 1950s+

Canada

A piece of equipment used at a Canadian manufacturing facility. The donor's father was Roland Ouellette who worked as an electronics technician at the CIP mill in Hawkesbury, Ontario. He was self taught in electronics but still received 4 patents for his inventions. Canadian Patents: # 925285 issued May 1, 1973; class 33-176; # 925286 issued May 1, 1973;  class 33-179; # 1222319 issued May 26, 1987;  class 354-29. United States Patent: #4,644,174 issued Feb 17, 1987.

Fonction

A high speed recording instrument used for the measurement of reverberation time, noise level, and the frequency response of microphones and loudspeakers. This example was used in a pulp mill, in the electronics shop for maintenance purposes.

Technique

Brüel & Kjaer were makers of high fidelity audio equipment and became more familiar as B&K in the 1980s; the firm is still producing test equipment though not of as high standard as this item. B&K instruments like this one were probably only used in really well equipped labs because of their cost. The quality of the workmanship is A1 almost to the point of excess. The instrument has a built in potentiometer and strip chart recorder with modules to control each. The frequency range is 20 - 400 c/s (Hz) and the lower limit could be adjusted over this range. The writing speed range of the recorder is 50-1000 mm / sec.

Notes sur la région

Inconnu

Détails

Marques

label on back reads "Type/ 2304/ Serial/ 24979/ Bruel & Kjar/ Copenhagen"/ white lettering on back reads "Made in Denmark"/ black lettering on component casings for control functions & reading "Bruel & Kjar/ Copenhagen", "Level Recorder Type 2304" & "50 db/ Potentiometer Type 2347"

Manque

appears complete

Fini

casing stained brown & coated/ glossy green painted component casings/ glossy black painted parts/ black controls/ metallic parts/ white paper with black backing

Décoration

S/O