General Information

Serial #

868221

Part Number

1

Total Parts

1

AKA

N/A

Patents

N/A

General Description

Metal casing and connector pieces with hard synthetic switches

Dimensions

Note: These reflect the general size for storage and are not necessarily representative of the object's true dimensions.

Length

22.1 cm

Width

13.9 cm

Height

N/A

Thickness

N/A

Weight

N/A

Diameter

N/A

Volume

N/A

Lexicon

Group

Communications

Category

Sound

Sub-Category

N/A

Manufacturer

AKA

Bruel Kjaer

Country

Denmark

State/Province

Unknown

City

Unknown

Context

Country

Canada

State/Province

Ontario

Period

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)

Function

Used to measure the difference between the phases of two electrical currents. Often used with a Phase delay unit (2016.0196). (From the Acquisition Proposal, see Ref. 1)

Technical

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

Area Notes

Unknown

Details

Markings

On the proper front: "[symbol] B - [symbol] A/ Power/ On/ Read/ Out/ Output/ 360 [degrees]/ Output/ 0 [degrees]/ Phase Meter Type 2971/ Display/ Unit/ Radian/ Degree/ Scale/ 0 - 6,28/ +/ - 3,14/ +/ - 180/ [logo]/ Brüel & Kjaer/ Frequency Limit/ Upper/ 200 kHz/ 20 kHz/ 2 kHz/ Lower/ 750 Hz/ WH 1073/ 20 Hz/ Input A/ Ref./ A/ Range/ 10 mV/ to 5 V/ 30 mV/ to 15 V/ Slope/ +/ -/ B/ Slope/ +/ -/ Range/ 10 mV/ to 5 V/ 30 mV/ to 15 V/ Input B"/ On the stickers on the proper top: "Bell-Northern Research [logo]/ L0021112"/ "nt/ FOR/ INDICATION/ ONLY"/ "BNR [logo]/ ACOUSTIC DESIGN"/ On the proper back: "Pen Lift/ Digital Output/ Fuse : T/ 250 mA / 100-127 V/ 160 mA / 220-240 V/ To Ext. Equipment/ 115 V/ Output Offset/ 0 to 1 V/ DC Output/ |1 V / rad|/ |10 mV / [degree]|/ Made in Denmark/ [logo] Serial no./ Made in Denmark/ 868221/ AC Power Input/ 50 - 400 Hz ~"/ On the sticker on the proper bottom: "[logo] BRUEL & KJAER CANADA LTD./ 90 Leacock Road, Pointe Claire. Qué./ MODEL 2971S S.N. 868221/ VOLT/ HZ/ PURCHASE/ DATE/ 12/17/81/ FUSE"

Missing

Appears complete

Finish

Predominantly black casing with a light green panels on the proper front and back. On the proper front are black markings and switches, a black screen with a white reading area and red indicator needle, and silver coloured metal connectors. On the top there is a white and blue sticker, a grey sticker with black markings and a pink sticker with black markings as well as a two small, round, blank stickers: one blue and one yellow. On the proper back there are black markings and covers, silver connectors and a black and silver coloured plate. On the proper bottom there is also a blue and white sticker.

Decoration

N/A