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Introducing the Revolutionary MI 6820T QHR System: Your New Intrinsic Resistance Standard. In today’s rapidly evolving world, precision and accuracy are paramount, National laboratories and industries around the globe demand reliable, traceable reference standards to ensure the integrity of their measurements. That’s where Measurements International (MI) steps in with the measurement-changing 6820T QHR Table Top System.
Let’s talk about efficiency. With the 6820T, you can say goodbye to the headaches of liquid helium shortages, unpredictable deliveries, and skyrocketing prices. These challenges have become all too common, impeding the progress of countless labs. The 6820T requires no liquid helium to operate, ensuring uninterrupted and cost-effective performance. Drawing upon years of expertise in Quantized Hall System design, resistance measurements, and working with a leading edge cryogenics company in the United States, the MI 6820T is a fully automated primary standard. It has been meticulously engineered to deliver highly reproducible resistance standards, empowering you to achieve your measurement goals with ease. The system has a modular design, consisting of three essential components: the QHE samples, cryogenics system, and bridge measurement system. This seamless integration guarantees a streamlined workflow and allows for effortless customization to suit your specific requirements. Each component can be ordered individually to meet your laboratory needs and requirements.
The MI 6820T QHR System is backed by our unwavering commitment to customer satisfaction. We provide comprehensive support, ensuring a smooth installation process, extensive training, and ongoing assistance whenever you need it. With us by your side, you can focus on what matters most – advancing your research and calibration, and exceeding your performance targets.
| Superconducting Magnet | |
| Magnet Type | Solenoid |
| Rated Central Field | 5.0 T |
| Rated Operating Current @ 6.0 T | 25.45 A |
| Total Inductance | 10.526 H |
| Homogeneity | ± 0.2 % 1 cm DSV |
| Superconductor | Twisted Multi-filamentary Nb Ti/Cu |
| Fabrication | Wet wound with epoxy to prevent training |
| Quench Protection | Adiabatic protection using copper matrix and diodes |
| Cryocooler | |
| Cooling Powers at 50 Hz | 1st Stage: 35 W @ 45 K
2nd Stage: 0.9 W @ 4.2 K |
| Base Temperature | < 3.6 K |
| Orientation | Vertical Only |
| Maintenance Interval | 30,000 hrs – 40,000 hrs |
| Ambient Temperature | 5 °C to 35 °C |
| Range
(1:1 Ratio) |
Accuracy
(µΩ/Ω) |
Range
(1:10 Ratio) |
Accuracy
(µΩ/Ω) |
Range
(1:100 Ratio) |
Accuracy
(µΩ/Ω) |
| 0.1 Ω to 0.1 Ω | 0.01 | 0.1 Ω to 1 Ω | 0.01 | 1 Ω to 100 Ω | 0.003 |
| 1 Ω to 1 Ω | 0.003 | 1 Ω to 10 Ω | 0.003 | 100 Ω to 10 kΩ | 0.003 |
| 10 Ω to 10 Ω | 0.003 | 10 Ω to 100 Ω | 0.003 | 1 kΩ to 100 kΩ | 0.003 |
| 100 Ω to 100 Ω | 0.003 | 100 Ω to 1 kΩ | 0.003 | 10 kΩ to 1 MΩ | |
| 1 kΩ to 1 kΩ | 0.003 | 1 kΩ to 10 kΩ | 0.003 | ||
| 10 kΩ to 10 kΩ | 0.003 | 1 kΩ to 13 kΩ | 0.003 | ||
| 100 kΩ to 100 kΩ | 0.005 | 10 kΩ to 100 kΩ | 0.005 | ||
| 1 MΩ to 1 MΩ | 0.01 | 100 kΩ to 1 MΩ | 0.01 |
| 0.1 Ω to 100 kΩ | |||
| Rx | Ratio & Accuracy (ppm)* | ||
| – | 1:1 | 10:1 | 14:1 |
| 0.1 Ω | < 0.02 | – | – |
| 1 Ω | < 0.015 | < 0.015 | < 0.015 |
| 10 Ω | < 0.015 | < 0.015 | < 0.015 |
| 100 Ω | < 0.015 | < 0.015 | < 0.015 |
| 1 kΩ | < 0.015 | < 0.015 | < 0.015 |
| 10 kΩ | < 0.02 | < 0.015 | – |
| 100 kΩ | – | < 0.05 | – |
