Renseignements généraux

Nº de série

S/O

Nº de partie

1

Nombre total de parties

1

Ou

S/O

Brevets

S/O

Description générale

Metal casing and connector pieces with hard synthetic knobs and a flexible synthetic power cord covering and handle.

Dimensions

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

Longueur

23,3 cm

Largeur

21,0 cm

Hauteur

14,2 cm

Épaisseur

S/O

Poids

S/O

Diamètre

S/O

Volume

S/O

Lexique

Groupe

Communications

Catégorie

Son

Sous-catégorie

S/O

Fabricant

Ou

Bruel Kjaer

Pays

Danemark

État/province

Inconnu

Ville

Inconnu

Contexte

Pays

Canada

État/province

Ontario

Période

1981-1998

Canada

Bell Northern Research, was the research and development subsidiary of Northern Telecom (later Nortel Networks) and Bell Canada. It was built by Northern Telecom at its Trans-Canada plant in Montreal. Northern Telecom and its predecessor, Northern Electric, was for decades Canada’s largest manufacturer of telecommunications equipment. Originally a subsidiary of the AT&T-owned Western Electric, for which it manufactured American-designed products for the Canadian market, Northern Electric became Canadian-owned in the 1950s and in the 1960s began to design and produce equipment to meet the distinctive needs of Canadian telecommunication companies. In the 1970s, through its new research subsidiary, Bell Northern Research, the company made a concerted shift from conventional analogue equipment into the emerging field of digital communications, becoming in the 1980s the first equipment supplier to provide a complete line of fully digital switching and transmission gear. During this decade the company moved aggressively into export markets, and opened manufacturing and R&D operations in several countries. The company’s sales soared during the internet boom of the 1990s, but a combination of poor financial decisions and a failure to maintain its technological edge led eventually to its bankruptcy in 2009. The original Bell Northern facilities were designed with cutting edge telecommunications research and development in mind with the first three buildings on the campus featuring laboratories, an extensive research library, and an anechoic chamber. The anechoic chamber was the focal point of the Bell Northern Research acoustics research examining both the technology and placement of speakers and microphones in telecommunication devices. The anechoic chamber group was organized under the Industrial Design and working together with design were responsible for the development of the acoustic properties of most products. (From the Acquisition Proposal, see Ref. 1)

Fonction

Used to generate the sound pulse (sinusoidal waves) for acoustic experiments. (From the Acquisition Proposal, see Ref. 1)

Technique

Used in conjunction with other Bruel & Kjaer equipment to build an experimental acoustic apparatus. (From the Acquisition Proposal, see Ref. 1)

Notes sur la région

Inconnu

Détails

Marques

On the proper front: "Sound Power Source Type 4205/ Overload/ Battery/ Check On/ Off"/ Around the dials and switch on the proper front: "Sound Power Spectrum. Octave/ 125 Hz/ 250 Hz/ 500 Hz/ 1kHz/ 2 kHz/ 4 kHz/ 8 kHz/ Wide Band/ 100 Hz - 10 kHz/ Ext. Filter"/ "On/ Off"/ "Sound Power Level/ dB re.1 pW/ 50/ 60/ 70/ 80/ 90/ 0/ 1/ 2/ 3/ 4/ 5/ 6/ 7/ 8/ 9/ 10"/ On the stickers on the proper front: BNR [logo]/ ACOUSTIC DESIGN"/ "Bell-Northern Research/ L0021079"/ "nt/ FOR/ INDICATION/ ONLY"/ On the proper back panel: "Power Supply/ Type 2808/ Output/ Power/ Off/ Charge/ On/ [logo]/ Made in/ Denmark/ 50-400Hz/ Int/ Ext./ + 6,6 V - +15 V/ Charge + 12 V/ Remote Control/ Ext. Power Supply/ Ext. Filter/ From/ Output/ To/ Input/ White Noise/ 50 Hz/ - 10 kHz/ Sound Source/ HP 1001/ Sound Power Level Calibration/ Wide Band / and/ Ext. Filter/ 8 kHz/ 4 kHz/ 2 kHz/ 1 kHz/ 500 Hz/ 250 Hz/ 125 Hz/ CHARGE VOLTAGE MUST ONLY/ BE APPLIED WHEN USING/ RECHARGEABLE BATTERIES/ Made in Denmark/ Brüel & Kjaer/ Type/ 4205/ Serial No./ 918890/ Made in Denmark"/ On an off-white sticker on the proper back: "BLACK COMMON/ BLUE CHARGE/ RED EXT. POWER"/ On the sticker on the proper bottom: "[logo]/ BRUEL & KJAER CANADA LTD./ 90 Leacock Road, Pointe Claire, Qué./ MODEL 4205 S.N. 918890/ VOLT/ HZ/ VA/ PURCHASE/ DATE/ 9/22/81/ FUSE"/ Incised on the casing next to the sticker: "L21079"

Manque

Appears complete

Fini

Predominantly black casing with light green panels on the proper front and the proper back. On the green panels are black markings and knobs, silver coloured metal connectors, a white meter and white, pink and grey stickers. On the proper top there is a black synthetic handle that collapses almost flush with the top of the casing.

Décoration

S/O