Please note. The GM04 Gaussmeter is no longer manufactured and this page is provided for reference only.
Hirst magnetic instruments can still provide a full calibration and repair service for its older instruments. The Hall probes remain unchanged and are freely interchangeable between the GM04,GM05,GM07,GM08,VGM01 and VGM02 models of Gaussmeter.
Designed for factory floor, on site and, laboratory measurement of Magnetic Flux Density and Magnetic Field Strength in SI or CGS, the GM04 gives excellent value for money.
The GM04 hand-held Gaussmeter has been designed and manufactured by Hirst Magnetic Instruments Ltd., a Company with more than 30 years experience in Magnetic Measurement. This experience and our extensive knowledge of the magnetics market has enabled us to design an instrument incorporating all of the measurement functions a user is ever likely to need. The GM04 hand-held Gaussmeter is controlled by a simple menu and is supplied with a thin semi-flexible Transverse Hall Probe suitable for all but the very smallest of applications.
Hirst Magnetic Instruments Ltd.'s GM04 hand-held Gaussmeter is microprocessor controlled and represents a significant improvement in functions, features and price performance in today's Gaussmeter market.
The GM04 hand-held Gaussmeter incorporates an Analogue Peak Detector for the DC and AC peak functions. This, coupled with the Microprocessor operation of the GM04 hand-held Gaussmeter means that fast response is possible with digital stability (fast pulses/no droop in readings).
The GM04 hand-held Gaussmeter can measure:-
Click here for display screenshots and further menu information.
Gaussmeter Measurement Units
The GM04 hand-held Gaussmeter can measure Magnetic Flux Density or Magnetic Field Strength. The menu system enables the Operator to easily choose between Tesla, Amps/m (SI units), Gauss and Oersted (cgs units).
Gaussmeter Data Capture
The GM04 hand-held Gaussmeter can HOLD measured values by pressing the Hall Probe button. Pressing the button again releases HOLD (When Enabled). The GM04 hand-held Gaussmeter can also STORE measured values. These values can later be RECALLED.
Gaussmeter Range Changing
If the Operator wishes to change ranges, the GM04 handheld Gaussmeter has a button dedicated to this function. No use of the menu is required.
The GM04 hand-held Gaussmeter has a number of UTILITIES options allowing the Operator to disable or select various times for the automatic POWER DOWN. Also nulling routines can be selected.
The GM04 hand-held Gaussmeter also has the facility to operate its menu structure in English, French, German, Italian, Spanish and Portuguese.
The GM04 hand-held Gaussmeter is Calibrated to Standards Traceable to the National Physical Laboratories. During manufacture, the accuracy of Nuclear Magnetic Resonance (NMR) is used to determine the irregularities and non- conformities of the GM04 hand-held Gaussmeter and its Hall Probe. This is stored and used mathematically to automatically correct readings taken by the GM04 hand-held Gaussmeter.
The GM04 hand-held Gaussmeter is ideal for inspection and measurement of magnetic flux density of magnets and magnet assemblies in both goods inward and Quality Assurance environments.
Applications include: Computer Disk Drive Actuators, Loudspeaker Air Gaps, Electric Motor Air Gaps (including Pancake and Permanent Magnets), Transformer Stray Field Measurements, Magnetiser and De-magnetiser Field Measurements, Bending Magnets, Non- Destructive Testing (Magnetic), Goods Inward and Quality Assurance Inspection etc.
The Hall Probe
The GM04 hand-held Gaussmeter, GM05 hand-held Gaussmeter and VGM01 Gaussmeters are supplied with a transverse Hall probe as standard. The design of the Hall probe is critical to the satisfactory operation of any Gaussmeter. For the GM04 hand-held Gaussmeter and GM05 hand-held Gaussmeter we have used our extensive industrial experience to produce a transverse Hall probe which is semi-flexible and only 1mm thick by 4mm wide. This enables operators to take measurements in tight spaces and narrow air gaps. In addition the sensitive Hall element is clearly visible so that the user knows exactly where the measurement is being made. The probe is fitted with a push button enabling the operator to HOLD and STORE measurements and orientate the probe for polarity readings. An Axial probe is also available as an optional extra. This is only 5mm in diameter and also incorporates a push button for HOLD and STORE functions. All transverse and axial probes are fully interchangeable on both the GM04 hand-held Gaussmeter and GM05 hand-held Gaussmeter without the need for re-calibration.