GUILDLINE INSTRUMENTS 6640Q QUANTUM HALL RESISTANCE (QHR) BRIDGE has been completely redesigned to provide better uncertainties and more operational capability. PRODUCT FEATURES New Patented Toroid Design New Dual Processor Design New Dedicated High Speed Real-Time Processor For Fast Measurements New Built-in Windows 10 Computer and Touch Screen Display Providing Complete Measurement Results and Graphs Best Accuracy: ± 0.015 ppm of Reading at QHR currents of 30 µA - 100 µA with Interchange Fasted Measurement Speed of 2 Seconds Change All Key parameters “On-the-Fly” While the Measurement is Running Linearity: ± 0.005 ppm of Full Scale Resolution: ± 0.0001 ppm of Full Scale Fully Programmable USB, IEEE 488.2 Industry Standard SCPI Programming Command Language BridgeWorksTM Data Acquisition Software Unique Calibration Support Strategy Complete Automated Measurements Quantum Hall Turn-Key Systems Available

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