Features and Benefits

Since 1994, Measurements International’s (MI) 6010B, and 6010C technology has set the standard for DC Current Comparator (DCC) Resistance Bridge performance in calibration laboratories globally. The time has now come to advance this best-in-class series, taking advantage of twenty-first century AccuBridge® technology.

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Figure 1: 6800 System

Measurements International’s major technological advantage in resistance measurements is the development of the first commercially available portable Quantum Hall system, 6800, (Figure 1) which uses AccuBridge® technology as the measurement system operated at ambient temperatures. The current range is from 1 μA to 200 mA for use as a Quantum Hall Bridge and a resistance bridge. The 6020Q features increased ampere-turn (AT) sensitivity with more turns on both the master and slave windings and a new voltage feedback circuit to improve on the linearity error of the nanovolt amplifier.

Measurements International has world-class expertise in both DC Resistance metrology at NMI’s and ISO 17025 accreditation throughout industry. As your accreditation partner and global support partner, MIL offers leading product knowledge and applications expertise through coaching, system design, implementation, calibration services, and ongoing expert support ensuring your competitive advantage.

At MI, it’s not only about the equipment and science, it’s about what you can do and the ease with which you can do it.

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Figure 2: 6800 Sample

The AccuBridge® 6020Q (furthermore 6020Q) room temperature Quantum Hall Resistance Bridge can be used to characterize both GaAs/AlGaAs (Figure 2) or graphene samples by measuring and plotting the field sweep, the contact resistance (Vcr), the longitudinal resistance and dissipation of the I = 2 plateau (Vxx), and transferring the Hall Resistance (Vxy) to a 1 kΩ or 10 kΩ standard resistors.

Enhancements using AccuBridge® technology include a higher ampere-turn sensitivity covering a wider range of resistance ratio, a current and voltage feedback circuit for increased linearity performance and a new calibration technique with increased resolution in obtaining even tighter specifications. In addition to the updated technology, it has the 6010’s dependability, simplified calibration, ease-of-use, automation, the speed of measurement and worldwide support making the 6020Q the best and only resistance bridge that offers uncertainty specifications that rival anything available today.

The 6020Q is a fully automated bridge. Its speed, precision and measurement accuracy accounts for its preferred status as the primary resistance bridge in most NMIs throughout the world. It is designed for flexibility and ease of use and is perfectly suited for stand-alone resistor calibrations.

The 6020Q has two inputs: Rx and Rs. The number of inputs can be expanded to 40 when used in conjunction with the 4200 series Low Thermal Four Terminal Matrix Scanners, see Figure 3. It is recommended that the model 4210A 10-Channel Matrix Scanner be ordered for use in the Quantum Hall System. Measurements can then be performed automatically with software. Delayed or scheduled measurements can be performed at any time. Automatic current reversal ensures that DC offsets and thermals are cancelled out the measurement.

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Figure 3 – 4210A Matrix Scanner