Cambridge Instruments Decade Bridge

Serial No. L38841

decade         decade

open in new window to view larger versions of images

Cambridge Instruments Four decade Wheatstone resistance bridge with range switch enabling the instrument to be used over a very wide range from 11.11 ohm to 11.11 MΩ full-scale (0- 11.11kΩ with ratio X1) For measuring the higher resistance ranges  a larger voltage supply is recommended. I have tested it against 1000Ω and 100Ω standard resistors and found it to be accurate down to the last digit.

I made a battery box from plywood complete with terminals to take four "C" cells instead of the original 4.5 V 126 battery to slot into the clip on the inside of the lid. Since doing this I have found that these batteries (or their modern replacement) are still available see:


These two pictures of one of the decade switches which indicate the quality of the instrument.

This is one of many instruments collected by Jack Davidson C Eng FIEE which I have been given by Dr Graham Winbolt.