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0.1 ppm four‐terminal resistance bridge for use with a dilution refrigerator
1.J. A. Rowlands and S. B. Woods, Rev. Sci. Instrum. 47, 795 (1976).
2.B. R. Barnard and A. D. Caplin, J. Phys. E 11, 1117 (1978).
3.H. vanKempen, H. W. Neyenhuisen, and J. H. J. M. Ribot, Rev. Sci. Instrum. 50, 161 (1979).
4.Direct Current Comparator Potentiometer ♯9935 (part of general potentiometer system ♯9936 with subsystems ♯9719 and ♯99361 omitted), available from Guildline Instruments, Ltd., Smiths Falls, Ontario, Canada K7A 4S9. At our request the manufacturer provided connections to the 3000‐turn slave coil at 1000 and 100 turns which correspond to 1 : 1 and 1 : 10 current ratios, respectively. All the circuits in this commercial system are powered by the slave power supply.
5.M. P. MacMartin and N. L. Kusters, IEEE Trans. Instrum. and Meas., IM‐15, 212 (1966).
6.Types MP1916A and MP1913A available from Analogic Corporation, Audubon Road, Wakefield, Massachusetts 01880.
7.W. P. Pratt, Jr., C. Uher, P. A. Schroeder, and J. Bass in Thermoelectricity in Metallic Conductors, edited by F. J. Blatt and P. A. Schroeder (Plenum, New York, 1978), p. 265.
8.J. A. Rowlands, C. Duvvury, and S. B. Woods, Phys. Rev. Letters 40, 1201 (1978).
9.Both resistors were manufactured by Cryocal, Inc. 2457‐T University Avenue, St. Paul, Minnesota 55114; The model numbers for and are CR‐1000 and CR‐50, respectively.
10.J. L. Imes, G. L. Neiheisel, and W. P. Pratt, Jr., J. Low Temp. Phys. 21, 1 (1975).
11.G. L. Neiheisel and W. P. Pratt, Jr., J. Low Temp. Phys. 28, 317 (1977).
12.N. B. S. Special Publications ♯260‐44 and 260‐62, U.S. Government Printing Office, Washington, D.C. 20402.
13.Bureau International des Pȯids et Mesures, Metrologia 15, 65 (1979).
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