• " Operating Unit for Fine-Beam Tube" , ONLY! Tube not included. (NOT TO BE SOLD SEPARATELY!)
• Specifications:
• Coil diameter: approx.300 mm
• Winding count: 124
• Magnetic field: 0 …3.4 mT (0.75 mT/A)
• Operating unit:
• Coil current: 0 … 4.5 A, 3-figure digital display
• Measurement output: 1 V*IB / A
• Anode voltage: 15 … 300 V, 3-figure digital display
• Measurement output: 0.01*UA

The fine beam tube and Helmholtz coil pair are mounted on the operating unit, the fine beam tube being rotatable around its vertical axis. The tube and coil pair are both connected internally to the operating unit without a need for external wiring. All supply voltages for the tube and the current through the Helmholtz coils are adjustable. The anode voltage and coil current are displayed digitally and can be tapped additionally as equivalent voltage values.