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 The MF-5D and MF-5DP are portable precision electronic integrating fluxmeters designed to measure the
magnetic flux coupling within a coil or loop of wire. These instruments integrate the volt-second signals induced across a coil by the flux coupling to the coil. The output is representative of the change in
flux coupling during the integrating period.
The instrument controls are organized so as to display the average flux density across the area of a coil or the total flux within that coil. A three decade input
dial, adjustable from one to 999, provides for setting in either the area turns of the coil for flux density or the number of turns for total flux.
The MF-5D and MF-5DP integrating fluxmeters employ a precision ultra-low drift operational amplifier circuit as an integrator. Scale sensitivity and ranges are
controlled by selecting appropriate values for the integrating capacitor and input resistors. Any uncompensated thermocouple voltages, which may be present at the
instrument's input, are removed by adjusting a drift control. A null push-button switch provides for increased sensitivity while adjusting the drift.
Both instruments use a 3½ digit bipolar LCD display which provides increased accuracy and 100% overrange capability. In addition, the MF-5DP will sense and display the most recent peak magnetic field level.
Designed for production and laboratory applications, the MF-5D and MF-5DP portable fluxmeters provide the user with a flexible and convenient means of accurately measuring total flux and flux density.
Total flux and flux density ranges can be easily scaled for direct reading. The direct reading ranges for total flux are from ±1 kilomaxwell turn to ±9.99x104 kilomaxwell
turns full scale with 100% over-range; for flux density, the direct reading ranges are ±1 kilogauss, ±10 kilogauss and ±100 kilogauss with 100% over-range. However,
these instruments can be used to measure fields from a few milligauss to several hundred thousand gauss with select sense coils. Readings are displayed on a 3½ digit bipolar LCD meter.
These instruments have three distinct measurement modes of operation, DC, RMS and AC. The MF-5DP has an additional peak measuring mode.
DC MODE: The instrument displays the magnitude of the magnetic field
for static and slowly changing fields The instrument output is the analog of the magnetic field from DC to 100 kHz. RMS MODE: The instrument displays the true RMS value of the composite DC/AC magnetic field up to 100 kHz. The instrument output is the same as in the DC mode. AC MODE: The DC field component is removed leaving only the analog of the AC field component at the output and to be displayed as a true RMS value.
MF-5 fluxmeters have a 1 V ±0.25% full scale analog output with 100% over-range
which is proportional to the measured flux from DC to 100 kHz.
In the Peak Mode, the MF-5DP will sense and display the most recent peak magnetic field level from DC to 20 kHz.
This instrument can be set to either detect the peak value when the field is bipolar (varying from positive to negative) or it can be set to exclusively detect either the
positive peak or the negative peak of a varying field. Because of the digital circuit design, there is no field decay in the peak mode.
The MF-5D and MF-5DP operate from either AC or sealed lead acid batteries. During
AC operation, the batteries receive a floating charge which keeps them fresh until the instrument is required for portable use. Freshly charged batteries will continuously operate each instrument for 12 to 15 hours.
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Standard Calibrated Search Coil: Model MS-1 100 cm
