General Information

Serial #

697104

Part Number

1

Total Parts

1

AKA

Beat frequency oscillator

Patents

N/A

General Description

Metal casing and connector pieces with hard synthetic knobs and flexible synthetic handles.

Dimensions

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

Length

43.0 cm

Width

22.7 cm

Height

14.5 cm

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

1978-1998

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 in acoustic experiments as a sound source. It is often used to prevent the generation of standing waves in building acoustic measurements. (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

Printed on the proper front panel: "Sine Generator Type 1023/ Generator/ Off/ On/ Off/ Ref. Signal/ On/ Off/ On/ Sweep Control/ Manual/ Ext. Mech./ Ext. Electr./ Lin./ Log./ Brüel & Kjaer/ Compressor Speed/ dB/s/ Off/ 10/ 30/ 100/ 300/ 1000/ Compressor Voltage/ 0/ 1/ 2/ 3/ 4/ 5/ 6/ 7/ 8/ 9/ 10/ Power/ On/ Output Voltage/ 0/ 1/ 2/ 3/ 4/ 5/ 6/ 7/ 8/ 9/ 10/ Load/ Max. 0,7 A RMS/ Distortion/ Modulation Frequency/ Hz/ Mod./ Off/ Ext./ Mod./ 1/ 2,5/ 6,3/ 16/ Output Attenuator/ mV/ Load/ 0,1/ 0,316/ 1/ 3,16/ 10/ 31,6/ 100/ 316/ 1000/ 3160/ 10000/ Output Imp./ 50 [Ohm]/ Scale Alignment/ Counting Time/ 0.1 s/ 1 s"/ On the measurement display on the proper right side: top line reads from "0" to "10" and marked as "V"/ Bottom line reads "-20" to "0" and marked "dB"/ "[logo]"/ On the measurement display on the proper left side: scale marked at the bottom "Hz"/ numbers from "0" to "20000"/ On the pink sticker on the proper front: "BNR [logo]/ ACOUSTIC DESIGN"/ On the proper top: a small white sticker reads: "Bell-Northern Research [logo]/ L0013361"/ On a red tag taped to the top of the casing: "NON CONFORMING MATERIAL/ CUSTOMER NORTEL/ PART NO. 023 SERIAL NO. 697104/ JOB NO. 5483 DATE 23 SEP 99/ REASON REJECTED FREQUENCY UNSTABLE/ DIGITAL DISPLAY READS 10% LOWER./ DISPOSITION NO REPAIR DONE, RETURNED/ AS RECEIVED./ INSPECTOR DAVE CHEYNEY."/ On the pink and red tag attached to the handle: "DEFECTIVE/ EQUIPMENT/ Make/ Model/ I.D. No./ DO NOT USE/ Originator:/ Used in Lab/ Date:/ Fault Desc.:/ Job No./ Notes:"/ On the proper back, printed on the casing: "Frequency Range/ Adjustment/ Upper/ Limit/ Lower/ Limit/ Frequency Control Voltage/ In/ Out/ Fixed Osc./ Variable Osc./ Frequency/ Marking/ ZM 0200/ Power Supply/ Attenuator/ Output/ Load/ Compressor/ Input/ Fuse 0,25 A/220 V/ 0,5 A/ 115 V/ 50-400 Hz/ [logo]/ Serial No./ 697104/ Made in Denmark"/ On a blue and white sticker on the proper back: "[logo]/ BRUEL & KJAER CANADA LTD./ 90 Leacock Road, Pointe Claire, Qué/ MODEL 1023C s.n. 697104/ VOLT/ HZ/ VA/ PURCHASE/ DATE/ 16/05/78/ FUSE"/ On a white sticker on the proper back: "1222/ This equipment has been/ approved for use of the premises of/ BELL NORTHERN RESEARCH - OTTAWA/ On behalf of/ ONTARIO HYDRO: [signature]"/ In the upper proper left corner and lower proper right corner are blue stickers with white lettering: "CALIBRATION/ [logo]/ VOID IF BROKEN"

Missing

Appears complete

Finish

Predominantly black casing with a light green panels on the proper front and back and two white meters with black markings. On the proper front are black markings, knobs, and switches, silver coloured metal connectors, and blue and pink stickers. On the top there are black synthetic handles that collapse almost flush with the top of the casing as well as a white and blue sticker, a red tag with black printed and written markings, and a pink and red tag attached to the proper right handle with a translucent white cable tie. On the proper back there are black markings and knobs, silver connectors, white and blue stickers and a black and silver coloured plate.

Decoration

N/A