The specifications include the purchase of a water-cooled, bipolar power supply to upgrade the existing GMW 3474-140 electromagnet.

A highly stable bipolar power supply provides the basis for the calibration of sensors and sensor arrays with the highest precession with regard to magnetic field determination. In accordance with the existing NMR magnetic measurement technology, the realization of measurements with significantly higher measurement rates is given, so that investigations of dynamic magnetic processes with the highest resolution can be realized with the measurement setup.

i. Technical design of the bipolar power supply

The power supply shall meet at least the following technical specifications:

• bipolar, 4-Quadrant

• Current range: ≥ ±140A

• Control voltage: ≥ ±80V

• max. Lastwiderstand: ≥0.54Ω

• Min. Lastwiderstand: ≤0.44Ω

• Lastinduktionsbereich: 0-0.5H

• Long-term stability (over 8h): equal to or better ±5ppm

• Load control: (±10% resistance change) equal to or better ±5ppm

• Temperature coefficient: equal to or better 5ppm/°C

• Interface: RS232

• Softwaretreiber: LabVIEW, Python

ii. Technical design of the recirculating chiller

• Cooling capacity at 20°C: ≥1.7kW

• Pumping capacity flow rate: ≥ 30l/min

• Pumping capacity delivery pressure: 0.5 ... 3 bar

• Height: <70cm

Scope of delivery:

•Power supply

• Umlaufkühler

• Software drivers

• Netzanschlusskabel

• Connection cable E-magnet

• Training

The requirements for the individual process parameters must be found in the specifications including the appendix "Award conditions".