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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
Platform(s):
Year of Manufacture: circa 1955
Dimensions:
Width (mm):
452 
Height (mm):
178 
Depth (mm):
210 
Weight (g):
7,520 
Location: Main Object Store
Inscription(s):

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

Notes:

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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