6820T Compact Dry QHR System

Cryogen-free System
Best accuracy to 0.003 × 10-6 with CCC Model 6200A
Best accuracy to 0.015 × 10-6 with DCC Model 6020Q
NEW low-vibration design < 10 nm
5 Tesla standard system magnet
New secure stand
Operational temperature < 4 K
3 sample mounts (LC44 or TO8)
Easy-to-use, turnkey functionality
For use with CCC and DCC bridges
6- to 7-hour cooldown rate
Direct transfer to 100 Ω, 1 kΩ, 10 kΩ, and 100 kΩ standards
6020Q system range: 0.1 Ω to 1 MΩ with 6200A or 100 kΩ
Optional multiple value arrays of RK/2, 100 Ω, 1 kΩ, 10 kΩ and 100 kΩ
Simultaneously compare Hall bar and arrays when using 6200
Current Range when using 6200A
- Three high-current ranges +/- (50 mA, 100 mA and 150 mA)
- Five low-current ranges +/- (100 μA, 333 μA, 1 mA, 3.3 mA, and 10 mA)

The 6820T Low-Vibration QHR Tabletop System is a compact, cryogen-free solution designed for laboratories requiring direct access to a quantum-based primary resistance standard. Building on Measurements International's expertise in quantum Hall resistance (QHR) systems and precision resistance metrology, the 6830T combines advanced cryogenic technology, automated operation, and an ultra-low-vibration design to provide a stable platform for highly accurate and repeatable QHR measurements.

Engineered with vibration levels of less than 10 nm, the 6830T minimizes mechanical disturbance at the QHR device while eliminating the need for liquid helium. This reduces operating costs, simplifies laboratory infrastructure, and removes dependence on helium availability. Its tabletop design and automated system control make primary resistance realization more accessible, reliable, and practical for national metrology institutes, calibration laboratories, and other high-level resistance measurement applications.

Superconducting Magnet