| |
HELM-3 |
HELM-3-2 |
| Axial Alignment |
Orthogonality better than ± 0.1 ° |
Orthogonality better than ± 0.1 degrees |
| Magnetic Constant |
1 Gauss/AMP Nominal |
75,000 nT/AMP Nominal |
| Calibration Accuracy |
± 0.015% at Coil Center |
± 0.01% at Coil Center |
| Field Uniformity |
< 0.3% Gradient in a centrally located 20cm sphere
< 0.1% Gradient in a centrally located 10 cm sphere |
< 0.025% Gradient in a centrally located 20 cm sphere
< 0.005% Gradient in a centrally located 10 cm sphere |
| Geometry |
(3) Nested Rectangular Coil Pairs |
(3) Nested Rectangular Coil Pairs |
| Dimensions |
Largest Dimension of Coil is 120 cm squared |
Largest Dimension of Coil is 215 cm2 |
| Weight |
50 kg |
114 kg |
| Construction |
All non-magnetic materials; coils are electrically isolated to prevent eddy current loops. |
All non-magnetic materials; coils are electrically isolated to prevent eddy current loops. |
