64 64 Introduction Flux Measurement Technology Flux Technology — Helmholtz Coils Helmholtz Coils Field standards DD Field accuracy of 0.75% DD Field uniformity of 0.5%* DD Standard field coil (field generation) DD Maximum field strengths from ≈26 G to ≈60 G DD Single axis configuration with 2.5 in, 6 in, and 12 in diameter coils Magnet moment measurement DD Calibration accuracy of 0.5% DD Use with Model 480 fluxmeter only DD Inspection and research of magnets (measure moment) DD Single and 2-axis configurations with 2.5 in, 6 in and 12 in diameter coils *Model dependent, see technical specifications Lake Shore Cryotronics, Inc. | t. 614.891.2244 | f. 614.818.1600 | e. [email protected] | www.lakeshore.com Introduction Flux Measurement Technology Flux Technology — Helmholtz Coils Magnet moment measurement for use with the Model 480 fluxmeter only We offer 3 Helmholtz coils for fluxmeter moment measurements: 64 mm (2.5 in), 152 mm (6 in), and 305 mm (12 in) diameter. FH-2.5 Calibration accuracy Inside diameter Coil resistance (approx) Operating temperature range Coil constant (approx) Input resistance (fluxmeter) Range (approx) FH-6 0.75% 152 mm (6 in) 110 Ω 0 °C to 60 °C 0.016 Wb·cm/V·s 64 mm (2.5 in) 35 Ω 0.013 Wb·cm/V·s 10 kΩ 100 kΩ 390 µWb·cm 3.9 mWb·cm 39 µWb·cm 390 µWb·cm 10 kΩ 480 µWb·cm 48 µWb·cm FH-2.5 100 kΩ 4.8 mWb·cm 480 µWb·cm FH-12 305 mm (12 in) 140 Ω 0.047 Wb·cm/V·s 10 kΩ 100 kΩ 1.4 mWb·cm 14 mWb·cm 140 µWb·cm 1.4 mWb·cm FH-6 102 mm (4.0 in) 64 mm (2.5 in) bore 32 mm (1.25 in) wide 25 mm (1.00 in) high opening through both sides 152 mm (6.0 in) ID 203 mm (8 in) +B +B 127 mm (5.0 in) 76 mm (3.0 in) banana jacks (current input) 102 mm (4 in) 88.9 mm (3.5 in) banana jacks (voltage output) FH-12 59.2 mm (2.33 in) 107 mm (4.2 in) 142 mm (5.6 in) 305 mm (12 in) ID 381 mm (15 in) 137 mm (5.4 in) Ordering information Part number FH-2.5 FH-6 FH-12 Bx 220 mm (8.65 in) Description 64 mm (2.5 in) Helmholtz coil 152 mm (6 in) Helmholtz coil 305 mm (12 in) Helmholtz coil All specifications are subject to change without notice NOTE: The FH Series coils are for use with the Lake Shore Model 480 fluxmeter only. They cannot be used with the Model 475, 455, 460, 450, or 421 gaussmeters. 200 mm (7.875 in) 305 mm (12 in) 241 mm (9.5 in) Lake Shore Cryotronics, Inc. | t. 614.891.2244 | f. 614.818.1600 | e. [email protected] | www.lakeshore.com 65 65