## MAG-RJJ-6.0

The computerized measuring system MAG-RJJ-6.0, which works under WINDOWS, is designed to measure dynamic magnetic properties of the soft magnetic materials.

The system uses the following test circuits:

Epsteina Frame 25 cm, 0.5 kg

Epsteina Frame 25 cm, 1.0 kg

Single Sheet Tester (500 x 500) mm

JM280 Yoke

JM100 Yoke

The MAG-RJJ-6.0 system provides measuring and determination of:» peak value of magnetic field strength Hm [A/m]

» effective value of magnetic field strength Heff [A/m]

» coercive field strength Hc [A/m]

» peak value of polarization Bm [T]

» peak value of induction Jm [T]

» effective value of induction Beff [T]

» effective value of polarization Jeff [T]

» remanence Jr [T] (Br [T])

» specific core losses Ps [W/kg]

» specific apparent losses Ss [VA/kg]

» loss separation of hysteresis and eddy-current losses Ph, Pw [W/kg]

» amplitudal relative magnetic permeability µA

» initial permeability in Epstein frame 25 cm for µApocz dla:

Hm = 0.4 A/m; f = 50 Hz

Hm = 1.6 A/m; f = 50 Hz

» differential relative magnetic permeability µd

» hysteresis loop for required value of polarization and magnetic field strength with full description of the parameters

» the set of hysteresis loops for different values of polarization and magnetic field strength with full description of the parameters for each data point

» anisotropy of induction (polarization) J [T] (B [T])

» anisotropy of losses A [%]

» specific core losses of mixed sample Ps [W/kg]

» magnetizability of mixed sample Jm [T]

» signals of voltage proportional to the sample induction (polarization) and current as a function of time with full description of the parameters for each data point

» signals of induction (polarization) and magnetic field strength as a function of time with full description of the parameters for each data point

» Fourier series distribution with full description and spectral lines diagram (for each measuring point) for function of magnetic field strength, induction (polarization), specific core losses, specific reactive losses and specific apparent losses with determination of deformation losses

» peak factor of field strength ks

» form factor of field strength kk

» automatic samples mass measurement

» final setting of obtained results

The MAG-RJJ-6.0 system provides the opportunity of a tabular and graphic presentation of the obtained data, which can be presented by means of monitor, printer or plotter with full description of measured object parameters. Each of the above mentioned magnetic quantities can be both dependent and independent variable of characteristic.

The computerized measuring system MAG-RJJ-6.0 is also adapted to measure the dynamic magnetic properties of the soft magnetic materials as a function of temperature in automatic mode by means of one or two sensors simultaneously. The measurement of temperature can be realized by means of thermo-couple by no-touch method or by means of laser pyrometer by touch method. Setting of measurement conditions consists in determining the required area of temperature changes, its tolerance and the step of change for measurements of dynamic magnetic properties for the required value of magnetic quantity.

The MAG-RJJ-6.0 system also allows setting the strictly determined temperature values. Obtained results are presented in the numeric and graphic mode.

An important advantage of the system is the possibility of export of all obtained results along with all measured time courses of magnetic and electric signals. This feature enables an operator to perform any mathematical operations using programs compatible with Windows. By that means this option provides full freedom for mathematical analysis and graphical presentation of obtained results.

All of the above mentioned characteristics can be measured as a function of magnetic field strength or polarization in the range of:» frequency

resolution f = 0.01 Hz (1÷10 000Hz)

setting accuracy <= 0.1 %

» magnetic field strength (for Epstein frame 25cm 50/60 Hz)

setting accuracy <= 0.3 % (0.1÷15 000A/m)

» polarization

minimal step J = 0.05 T (0.005÷2.5T)

setting accuracy <= 0.1 %

The measurements can be performed in the whole or in the closely restricted measuring range with required value of magnetic polarization or magnetic field strength. The measurements may also be accomplished for defined values of magnetic polarization or magnetic field strength. Magnetic field strength or magnetic polarization can be independent variables in each case.

The measurements are performed with preservation of sinusoidal signal of magnetic induction differential. Allowed deviation of the form coefficient from sinusoid does not exceed 0.1%. The measurements can also be performed without preservation of sinusoidal signal of magnetic induction differential. The measurements, which were performed in normalized range, fulfil IEC and EN standards.

It is also possible to perform researches for set tolerance values of:

Setting of the measuring quantity value,

Form coefficient.

Moreover the user can set the limitary value of magnetizing current.

Demagnetisation of the sample can be omitted or included into the measuring procedure. The value of demagnetic field and time of demagnetisation can be determined by operator. The whole measuring process as well as the calibration procedure is fully automated.