300 mm Helmholtz Coils - Ferronato BH300-3-A

--- Desktop set of three pairs of Helmholtz coils for laboratory and general purposes.

Same generating field ratio for each of the three pairs, with a round value easy to handle: 500 µT/A
Accurately made, with error smaller than ±1% in the generated field.
The coil arrangement can be modified with relative facility thanks to its simple support and its joins by screws.
Coils on non-magnetic aluminium alloy forms.
Each aluminium form provides a usable extra turn, with connections at the terminal block. An application example is the generation of a small magnetic field (DC or AC) to modulate the main one. Also it can be wired to generate small gradients. (- Click here for more details -)
The aluminium forms also act like electrostatic screens.
The coils can undergo heatings by currents to at least 100 ºC without damage.
Robust construction but with a reasonable weight.
Totally constructed with non-ferromagnetic materials.
Excellent quality/price ratio.
There are available versions of one and two axes, with similar characteristics:
- BH300-1A-A, on one axis, horizontal, with only the X pair.
- BH300-1B-A, on one axis, vertical, with only the Z pair.
- BH300-2A-A, on two axes, horizontal/horizontal, with the X and Y pairs.
- BH300-2B-A, on two axes, horizontal/vertical, with the X and Z pairs.

Field/Current ratio	500 µT/A (5.0 Gauss/A). For each pair, X, Y or Z. Maximum error: ±1%. In DC and AC.
Maximum field	2.0 mT (20 Gauss) in a steady mode / 3.0 mT (30 Gauss) during 2 minutes. Each pair.
Maximum current	4.0 A in a steady mode / 6.0 A during 2 minutes (start temperature: 20 ºC). Each pair.
Isolation voltage	250 V DC minimum, between windings and their forms and between pairs. Tested to 500 V DC.
Magnetic field homogeneity	Differences smaller than ±1% with respect to the centre, in a spherical volume of 70 mm of diameter, centred in the coils. Differences smaller than ±5% in a spherical volume of 100 mm of diameter. Volumes to 1% and 5% greater on some directions.
Orthogonality error	< 0.2º, or < 0.1º optionally.
Connection	Single row, twelve positions, barrier strip terminal block, with M4 brass screws (Ø 4 mm).
Max. working temp.	80 ºC for the set / 100 ºC for the coils, as measured on its surface.
Coil cross section	Winding: 8.5 x 10 mm, maximum. Total (form): 10 x 13 mm
Materials	Enamelled copper wire windings, filled with epoxy resin. Coil forms of aluminium alloy, with internal isolating layer and connecting plates of resin/glass fibre (FR4) with PVC covers. Stand support pillars and coil brackets in Acetyl ("Delrin"), with upper and lower boards in foamed PVC. Screws of nickel-plated brass and nylon.
Maximum dimensions	Height 364 mm x Wide 309 mm x Depth 276 mm.
Weight	4.5 kg for the BH300-3-A set (lower for BH300-1A/B-A and BH300-2A/B-A).
Accessories	Delivered with Instructions of Use in Spanish and English.
Warranty	Two years.

	X pair (large)	Y pair (medium)	Z pair (small)
Effective diameter:	300 ±1 mm	266 ±1 mm	237 ±1 mm
Turns number:	83	74	66
DC Resistance, at 20 ºC: (¹)	4.21 Ω ±3%	3.35 Ω ±3%	2.66 Ω ±3%
Self-inductance:	10.4 mH ±5%	7.1 mH ±5%	4.9 mH ±5%
Self-resonance Frequency: (With one form end connected to one coil end)	~ 25 kHz	~ 34 kHz	~ 42 kHz

Secondary field generated by the forms when used as coils (Xs, Ys, Zs): (²)	6.0 µT/A ±1%	7.1 µT/A ±1%	7.7 µT/A ±1%

300 mm Helmholtz Coils	- Versión en Castellano (clic aquí)
Ferronato^® - BH300-3-A

Version:	BH300-3-A	BH300-2A-A	BH300-2B-A	BH300-1A-A	BH300-1B-A
Included coil pairs:	X, Y, Z	X, Y	X, Z	X	Z

For any enquiry, please, do not hesitate in contact us:
Our E-mail (click here): Our Telephone: (+34) 925 536154 Our Fax: (+34) 925 537644	Our Home Page (click here)