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Digitally programmable ratio transformer bridge
dc.contributor.authorMagerlein, J. H.en_US
dc.contributor.authorSanders, T. M.en_US
dc.date.accessioned2010-05-06T23:17:27Z
dc.date.available2010-05-06T23:17:27Z
dc.date.issued1975-12en_US
dc.identifier.citationMagerlein, J. H.; Sanders, T. M. (1975). "Digitally programmable ratio transformer bridge." Review of Scientific Instruments 46(12): 1653-1655. <http://hdl.handle.net/2027.42/71154>en_US
dc.identifier.urihttps://hdl.handle.net/2027.42/71154
dc.description.abstractWe describe a digitally programmable impedance bridge, used here for low‐temperature resistance thermometry, and a compatible digital programming and data logging interface. The bridge employs a commercial programmable ratio transformer to achieve high resolution with minimum circuit complexity. We measure the ratio of the resistances of a carbon thermometer and a fixed reference resistor, both near 2 K, with a resolution limited by Johnson noise in the resistors. The bridge circuit described here is suitable for a variety of programmable or self‐balancing impedance measurements.en_US
dc.format.extent3102 bytes
dc.format.extent303667 bytes
dc.format.mimetypetext/plain
dc.format.mimetypeapplication/pdf
dc.publisherThe American Institute of Physicsen_US
dc.rights© The American Institute of Physicsen_US
dc.titleDigitally programmable ratio transformer bridgeen_US
dc.typeArticleen_US
dc.subject.hlbsecondlevelPhysicsen_US
dc.subject.hlbtoplevelScienceen_US
dc.description.peerreviewedPeer Revieweden_US
dc.contributor.affiliationumPhysics Department, University of Michigan, Ann Arbor, Michigan 48104en_US
dc.description.bitstreamurlhttp://deepblue.lib.umich.edu/bitstream/2027.42/71154/2/RSINAK-46-12-1653-1.pdf
dc.identifier.doi10.1063/1.1134132en_US
dc.identifier.sourceReview of Scientific Instrumentsen_US
dc.identifier.citedreferenceJ. H. Magerlein, Ph.D. thesis (University of Michigan, 1975).en_US
dc.identifier.citedreferenceP. C. F. Wolfendale, J. Phys. E 2, 659 (1969).en_US
dc.identifier.citedreferenceR. L. Chase, Rev. Sci. Instrum. 42, 319 (1971).en_US
dc.identifier.citedreferenceFor a discussion of ac bridge techniques see, for example, B. M. Oliver and J. M. Cage, Electronic Measurements and Instrumentation (McGraw‐Hill, New York, 1971), Chap. 9.en_US
dc.identifier.citedreferenceA variety of programmable ratio transformers with different resolutions and a choice of binary or BCD coding are produced by Singer Instrumentation, 3211 South La Cienega Blvd., Los Angeles, CA 90016. We used a model PRTD‐60012, which has BCD coding and six‐digit resolution.en_US
dc.identifier.citedreferenceRatio transformer bridges with both resistors at helium temperature have been used, for example, by G. Ahlers, Phys. Rev. 171, 275 (1968) and G. G. Ihas and F. Pobell, Phys. Rev. A 9, 1278 (1974).en_US
dc.identifier.citedreferenceA. C. Anderson, Rev. Sci. Instrum. 44, 1475 (1973).en_US
dc.identifier.citedreferenceType C413N from Teledyne Crystalonics, 147 Sherman St.,Cambridge, MA 02140. We used the simple circuit from the transistor data sheet. Several high‐transconductance switching FETs were also found to have quite low voltage noise. We measured a voltage noise of about 2nV/(Hz)½2nV∕(Hz)12 for the Motorola type 2N4860.en_US
dc.identifier.citedreferenceThe bandpass filters are built from universal active filter type FS‐60 from Kinetic Technology Inc., 3393 De La Cruz Blvd., Santa Clara, CA 95950. A similar product is now available from Burr‐Brown Research Corp., International Airport Industrial Park, Tucson, AZ 85734.en_US
dc.identifier.citedreferenceG. I. Rochlin, Rev. Sci. Instrum. 41, 73 (1970).en_US
dc.identifier.citedreferenceType 8136‐PG21‐60 from Augat Inc., 33 Perry Ave., Attleboro, MA 02703.en_US
dc.owningcollnamePhysics, Department of


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