A new technique for the automatic measurement of high value resistors

Henderson, L C A

doi:10.1088/0022-3735/20/5/002

Cited by 64 publications

(20 citation statements)

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“…Guarded high-resistance bridges that use programmable dc sources 6,8 to obtain a bridge balance can use the guarded scanner to connect standards, check standards, and unknown resistors to the bridge. Such a system was used to evaluate the guarded scanner as described in the previous section.…”

Section: A Automated Active-arm Bridgesmentioning

confidence: 99%

Design and evaluation of a low thermal electromotive force guarded scanner for resistance measurements

Jarrett

Marshall²,

Marshall³

et al. 1999

Review of Scientific Instruments

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The design and testing of a low thermal electromotive force guarded scanner, developed to provide completely guarded switching when used with actively guarded resistance bridge networks, is described. The design provides a continuous guard circuit trace on the scanner circuit boards that surrounds the relay contacts and protects the measurement circuit from leakages to ground. Modification to the circuit boards and relays of the guarded scanner are explained. Several tests were developed to evaluate the guarding effectiveness, including isolating sections of the guard circuit to create a potential drop between the main and guard circuits. Calibration of standard resistors using the guarded scanner has shown relative differences less than 1ϫ10 Ϫ6 , 30ϫ10 Ϫ6 , and 150ϫ10 Ϫ6 for measurements made with and without the guarded scanner at nominal resistances of 1, 10, and 100 G⍀, respectively. The substitution method was used to significantly reduce the relative differences between channels to less than 0.5ϫ10 Ϫ6 , 3ϫ10 Ϫ6 , and 30ϫ10 Ϫ6 for nominal resistances of 1, 10, and 100 G⍀, respectively. Applications for the guarded scanner in automated direct current measurement systems are presented. ͓S0034-6748͑99͒01306-4͔

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Section: A Automated Active-arm Bridgesmentioning

confidence: 99%

Design and evaluation of a low thermal electromotive force guarded scanner for resistance measurements

Jarrett

Marshall²,

Marshall³

et al. 1999

Review of Scientific Instruments

View full text Add to dashboard Cite

show abstract

“…, n~tional representations of the SI ohm, four-terminal standard resi~tors' are compared to the QHR standardusing CCC bridges. These CCC measurements generally transfer SI values to resistors near 100 n. 1\vo isolated windings and a SQUID detect !be current ratio while a sensitive voltage detector measures the differenceinpotentialacrossthe standards.In contrast, th~tW9-terminalCCC is similar in concept to bridges such as the active-arm bridge [4] and the Josephson potentiometer [5]. This duality is observed in many types of impedance bridges.…”

Section: Introductionmentioning

confidence: 96%

Direct resistance comparisons from the QHR to100 M/spl Omega/ using a cryogenic current comparator

Elmquist

Hourdakis

Jarrett

et al. 2005

IEEE Trans. Instrum. Meas.

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Measurements of room-temperature 100 Mn standard resistors and cryogenic thin-film resistors based directly on a quantized Hall resistance standard have been made with a cryogenic current comparator (CCC) bridge. This is 496:2 ratio CCCattains a current sensitivity of 10.7 fA/Hzl/2 in measurements of cryogenic thin-film resistors, without extensive shielding or filtering. A resistive primary winding helps the CCC maintain stability in the presence of external noise. The resistive-winding technique may be useful for the absolute measurement of small currents delivered by single-electron tunneling devices.

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“…So, some NMIs developed more accurate measurement methods [5,6] and fabricated high value resistance standards with characteristics of elevated stability and insensitivity to the environmental conditions and to the measurement parameters [7]. In order to assure the equivalence among the measurements performed in the different NMIs, a key comparison on high resistance (10 MX and 1 GX) was promoted and concluded by the CCEM [8].…”

Section: Introductionmentioning

confidence: 99%