Helmholtz coil (field standard) specifications

 MH-2.5MH-6MH-12MH-2X-10
Field accuracy 0.75%
Inside diameter 2.5 in 6 in 12 in 12 in (x-axis) and
9.75 in (y-axis)
Field strength ≈30 G/A ≈25 G/A ≈13 G/A ≈15 G/A
(note: coils are not exactly matched)
Maximum
continuous current
2 A (DC or RMS)
Field uniformity 0.5% within a cylindrical volume 0.75 in long, 0.75 in diameter, at center of coil 0.5% within a cylindrical volume 1.6 in long, 1.6 in diameter, at center of coil 0.5% within a cylindrical volume 3.0 in long, 3.0 in diameter, at center of coil ≈0.5% within a 2.5 in cube, at center of coil
DC coil resistance/
inductance (approx)
3 Ω/6.3 mH 10 Ω/36 mH 20 Ω/93 mH 20 Ω (x-axis), 15 Ω (y-axis)/
128 mH (x-axis), 74 mH (y-axis)
Operating
temperature range
0 °C to 40 °C (32 °F to 104 °F)
MH-2.5 drawing MH-6 drawing
MH-12 drawing MH-2X-10 drawing