| 摘要 |
PROBLEM TO BE SOLVED: To highly speedily switch ESR measurement and NMR measurement. SOLUTION: A magnetic field generator for generating a static magnetic field by a direct current supplied from a DC power source, includes: a first DC circuit composed of an exciting coil L1, a resistor R1 for determining a current flowing in the exciting coil L1, and a first diode D1 inserted in the forward direction between the exciting coil L1 and the positive electrode of the DC power source; and a second DC circuit composed of an auxiliary coil L2, a resistor R2 for determining a current flowing in the auxiliary coil L2, and a switch S1 inserted between the auxiliary coil L2 and the negative electrode of the DC power source, to switch the current flowing in the auxiliary coil L2 on/off. The front stage side of the exciting coil L1 and the front stage side of the switch S1 being the rear stage side of the auxiliary coil L2, are connected with a second diode D2 so that its forward direction becomes the direction from the second DC circuit to the first DC circuit. COPYRIGHT: (C)2011,JPO&INPIT
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