Resistance Box : Dial Type (Constantan & Manganin)
General : Decade Resistance Boxes incorporate the latest design switches so as to ensure low contact resistance. The moving contacts are constructed from phosphor-bronze lamination to ensure long life and repeatability of results. Eleven position switches are employed.
Panel : An insulating panel of bakelite enclosed in an elegantly polished teak wood box. Resistance Coil : Resistance Coils are non-inductively wound, properly varnished and aged for permanence of values over a long period. Imported double silk covered manganin or constantan wire is used in Grade Aand Grade B resistance boxes separately. Manganin has a negligible temperature coefficient against copper.
Accuracy : Accuracy is brought within the field ±0.05% to ±0.1% for
constantan coils (B Grade) and ± 0.02% to ±0.05% for manganin coils (AGrade)
Contact Resistance : Contact Resistance per decade is of the order of 0.0015 ohm.
Range (Constantan Coil) Accuracy ±0.05% to 0.1%
864 Single Dial 0.01W to 0.1W
865 Single Dial 0.1W to 1W
866 Single Dial 1W to 10W
867 Single Dial 10W to 100W
868 Single Dial 100W to 1000W
869 Single Dial 1000W to 10000W
870 Double Dial (0.01×10 & 0.1×10)ohms
871 Double Dial (0.1×10 & 1×10)ohms
872 Double Dial (1×10 & 10×10)ohms
873 Double Dial ( 10×10 & 100×10)ohms
874 Three Dial having 0.01, 0.1 & 1W decades
875 Three Dial having 0.1, 1 & 10W decades
876 Three Dial having 1,10 & 100W decades
877 Four Dial having 0.1, 1, 10 & 100W decades
878 Four Dial having 1,10,100, 1000W decades
879 Five Dial having 0.1, 1,10,100 & 1000W decades
880 Five Dial having 1,10, 100, 1000 & 10000W decades
Range (Manganin Coil) Accuracy ±0.02% to 0.05%
882 Single Dial 0.01W to 0.1W
883 Single Dial 0.1W to 1W
866 Single Dial 1W to 10W
867 Single Dial 10W to 100W
868 Single Dial 100W to 1000W
869 Single Dial 1000W to 10000W
870 Double Dial (0.01×10 & 0.1×10)ohms
871 Double Dial (0.1×10 & 1×10)ohms
872 Double Dial (1×10 & 10×10)ohms
891 Double Dial ( 10×10 & 100×10)ohms
892 Three Dial having 0.01, 0.1 & 1W decades
893 Three Dial having 0.1, 1 & 10W decades
894 Three Dial having 1,10 & 100W decades
895 Four Dial having 0.1, 1, 10 & 100W decades
896 Four Dial having 1,10,100, 1000W decades
897 Five Dial having 0.1, 1,10,100 & 1000W decades
898 Five Dial having 1,10, 100, 1000 & 10000W decades