Single Axis Fluxgate Magnetometers

    

Mag-01 and Mag-01H

These portable high performance instruments provide precision measurements of the direction and intensity of static and slowly varying magnetic fields from 0.1nT to 2mT (1mT=10G). Axial and transverse probes are available together with unpackaged probes for cryogenic applications.
Both instruments are mains or battery powered and have a 4½ digit display and analogue output. The internal rechargeable battery provides 16 hours continuous use and can be recharged using the mains adaptor provided.

The Mag-01 provides a maximum resolution of 1nT whilst the Mag-01H has an additional sensitivity control providing a resolution of 0.1nT and an offset control for up to ±90µT in 10µT steps.

These instruments feature superb linearity and accuracy and very low drift with time and temperature. Calibration is traceable to international standards and a re-calibration service is available.

Applications include the measurement of induced and remanent magnetism and use in site surveys prior to the installation of MRI equipment.

Mag Probes

The following probes are available:

Type	Low field probes (0 to 0.2mT)	High field probes (0 to 2mT)
Axial	Mag B Probe	Mag D Probe
Transverse	Mag C Probe	Mag E Probe
Cryogenic	Mag F Probe	Mag G Probe

The measurement range/resolution (LCD display) are:

Magnetometer	Low field probes		High field probes
	Range(µT)	Resolution(nT)	Range(µT)	Resolution(nT)
Mag-01	0-20	1	0-200	10
	20-200	10	200-2000	100
Mag-01H	0-2	0.1	0-20	2
	2-100	1	20-1000	10
	100-290	10	1000-2000	100

The sensing axis of the B and D probes is in line with the axis of the cylindrical enclosure. The sensing axis of the C and E probes is along the axis of the short cylinder at the end of the probe. The magnetic detection axis and centre of sensitive volume are marked on each probe.

The cryogenic probes are suitable for operation at temperatures down to liquid helium and have 1m of 4 x 0.2mm enamelled copper wire connected to the element for use in a cryostat or vacuum chamber. This length can be extended to a maximum of 5 metres if required.

A magnetometer probe switch unit is available for the sequential selection of two or three probes, type B-G, for operation with a Mag-01 or Mag-01H instrument. The Mag probes can be operated at a distance up to 25 metres from the switch unit.

---

Mag-01 and Mag-01H Electronics Unit Specification
Performance
Measuring range	0 to 0.2mT or 2mT depending on probe
Bandwidth x1 sensitivity (low field probes)	dc to -3dB at 10Hz, 20µT P-P, -12dB per octave roll off
Calibration accuracy	0.1%
Maximum resolution	1nT (Mag-01), 0.1nT (Mag-01H)
Zero field offset	±5nT
Offset drift	0.01nT/°C
Calibration temperature coefficient	<10ppm/°C
Liquid crystal display	4½ digit autoranging
For high field probes multiply reading on display by 10 to obtain a true value
Front panel controls/sockets
On/Off switch	switches on the internal battery supply
Probe input	6 pole waterproof Fischer connector
Charge indicator	LED illuminated when external supply is connected
Offset control (Mag-01H only)	allows a preselected field strength between ±90µT in ±10µT steps to be subtracted from the field experienced by the probe
Sensitivity control (Mag-01H only)	increases the sensitivity of the magnetometer by a factor of 10
Rear panel sockets
Battery charger inlet	2.1mm socket dc 0.5A max. Polarity protected 6-18V continuous or intermittent use
Analog output - low field probes - high field probes	2 x 4mm rear panel insulated sockets 5V full scale 100µT/V (10µT/V with x10 sensitivity on Mag-01H) 2V full scale 1mT/V (0.1mT/V with x10 sensitivity on Mag-01H)
Output impedance	1 kohm
Mechanical
Dimensions	155 x 170 x 68mm
Enclosure	high impact ABS
Weight	1.5kg
Environmental
Operating temperature range	-10°C to +50°C
Relative humidity	80% maximum non-condensing
Accessories
Instrument stand, carrying bag
Mains adaptor/battery charger - 110V or 220V (as requested)
Option - service manual

Mag Probes Technical Specification
Calibration accuracy	1%
Linearity	0.01%
Connection cable	4 core screened 5 metre with integral 6 pole Fischer connector. Alternative lengths of cable (maximum length 25 metres) are available on request
Environmental sealing	submersible in water to 10 metres
Shock resistance	drop tested from 0.5 metre onto PVC floor 3 times
Enclosure material	gold plated brass
Probe alignment to case	better than 0.2 degrees
Operating temperature range - axial and transverse probes - cryogenic probes	-30°C to +75°C Liquid helium to +75°C
Low field Mag Probes type B, C and F
Temperature coefficient of calibration	±10ppm/°C over full range of operating temperatures
Offset error	<1nT over full range of operating temperatures
Sensitive volume	0.02cm³
Excitation power	26mW
High field Mag Probes type D, E and G
Temperature coefficient of calibration	±30ppm/°C over full range of operating temperatures
Offset error	<20nT over full range of operating temperatures
Sensitivity volume	0.0035cm³
Excitation power	16mW

 

Probe Construction
Axial	Transverse	Low Temperature