1. WITHOUT EARTH, USABLE IN NO DETERIORATION OF EFFECT
   Both primary and secondary sides are covered by individual electromagnetic shielding board respectively. Accordingly, in case of normal mode, the effect is quite unchangeable without earth, and in case of common mode, "Noise Reduction Device" can be used without deteriorating the effect by the shielding board in the secondary side being connected with the ground of the damaged machinery, even in the places where have insufficient earth route and cannot be earthed at all. Namely, any place is available for use of "Noise Reduction Device".
   
   
2. UNNECESSITY OF IMPEDANCE MATCHING
   The electric circuits of primary and secondary sides are mutually insulated in both direct current and static electricity, and noise is mainly lost in magnetic path. Consequently, the effect is hardly influenced by the impedances of power source and load side. This is very important merit for the equipments and machinery of power source which must meet any load.
   
   
3. NO ANXIETY FOR LEAKAGE CURRENT
   "Noise Reduction Device" has only leakage current of fundamental wave that is less than usual power transformer. Accordingly, "Noise Reduction Device" is safe for human body, and does not move leakage breaker down. Besides, "Noise Reduction Device" can have high insulation withstand voltage had between wire way and earth.
   
   
4. EFFECTIVE FREQUENCY BAND IS WIDE
   In case of common mode, any low frequency can be shutoff. Moreover, also in normal mode, "Noise Reduction Device" has effective band of several figures from VLF band to VHF. Consequently, any noise can be shutoff by "Noise Reduction Device" only. And "Noise Reduction Device" never misses it, even if accidental or unexpected noise invades.
   
   
5. CHARACTERISTIC IS SYMMETRICAL AND EFFECT IS FOR BOTH DIRECTIONS
   Construction is symmetrical and effect is unchangeable by the direction of passage of noise. Accordingly, one piece of "Noise Reduction Device" can cover all of the case that the machinery is given damage by noise, the case that it is the source of noise generation, and the case that it is given damage by noise and at the same time, generates noise.
   
   
6. INFLUENCE OF CURRENT IS SMALL
   Effect of "Noise Reduction Device" does not decrease even for noise with marvelous large current. "Noise Reduction Device" is fully effective for lightning surge etc. "Noise Reduction Device" shows the attenuation factor of 1/100000 to 1/1000000 for artificial lightning(1×40 standard impulse voltage).
   
   
7. "Noise Reduction Device" PRODUCES NO COUNTER RESULT
   "Noise Reduction Device" is being made to have high frequency wave lost very much. In consequence, "Noise Reduction Device" is no afraid of the failure that the series resonance occurs at some frequency and on the contrary, noise is called in, like other components, for example, LC filter circuit. Accordingly, the users are free from the trouble of choice for each case.
   
   
8. EFFECT OF CASCADE IS REMARKABLE
   Other components do not always increase the effect, even if they are added more than twice, but "Noise Reduction Device" increases the effect at about the multiplier of its number. Therefore, for instance, ideal shield room can be built by installing one piece each of "Noise Reduction Device" at the inside and outside wall of shield room and connecting them in cascade.
   
   
9. Any electronic circuit has proper distributed capacity and induction coefficient without fail, and accordingly has many resonance frequency. By it, when the quantity of electricity suddenly changes, many parasitic oscillation occurs. Most noise are this parasitic oscillation. If the source of generation is directly connected with peripheral circuit, the constant mutually interferes and is complicated, and the counterplan becomes difficult only, but this is prevented by its being connected with peripheral circuit through "Noise Reduction Device", that is, "Noise Reduction Device" has the effect that stops the generation.

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