The 240C Kelvin Ratio Bridge allows comparison of resistors to 0.5 ppm either by interchanging the units or reading their values directly. Direct readout is possible to an accuracy of ?0.001% using the 952C (sold separately). This bridge can also be used to determine deviation of an unknown resistor from a standard. The 240C has 5 multiplier ratio settings: x0.01 to x100.0. The deviation dial ranges are as follows: 0.1 ppm/dial division, ?6 ppm; 1.0 ppm/dial division, ?60 ppm; 0.001%/dial division, ?0.06%; 0.01%/dial division, ?0.6%. Resolution is ? dial division with a linearity of ?1 dial division.
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