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Portable Wheatstone Bridge

Technical Information

Catalogue No: C0405
Category: General Purpose
Object Type: Test Equipment
Object Name: Portable Wheatstone Bridge
Part No: 7383
Serial No: 45,801
Manufacturer: WG Pye & Co
Division: Unknown
Year of Manufacture: circa 1955
Dimensions: Width (mm): 452
Height (mm): 178
Depth (mm): 210
Weight (g): 7,520
Location: Rack RAA07 [Main Store]

Made in England
Pye Scientific Instruments
Cat.No. 7383
Ser.No. 45,801
W.G.Pye & Co Ltd.
Granta Works Cambridge
[calibration label]
Inst. No. 45801
Division SD CQD EMC
Retest before 24-8.95
E. Standards and Cal'b Labs. C.Q.D.
ETL 909
Cal Period 12 months


This high quality instrument has a nice solid wooden case, robust controls and was made by WG Pye & Co, probably in the 1950’s or 1960’s. It is a four decade instrument with separate divide and multiply switches. Provision is made for an internal or an external battery.

This instrument was used in the EMC section of CQD.

A Wheatstone bridge is an electrical circuit used to measure an unknown electrical resistance by balancing two legs of a bridge circuit, one leg of which includes the unknown component. The primary benefit of a wheatstone bridge is its ability to provide extremely accurate measurements (in contrast with something like a simple voltage divider). It was invented by Samuel Hunter Christie in 1833 and improved and popularized by Sir Charles Wheatstone in 1843.

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