Inquiry method of the source which generates electromagnetic wave

• US 6,833,714 B2
• Filed: 02/01/2002
• Issued: 12/21/2004
• Est. Priority Date: 03/16/2001
• Status: Expired due to Fees

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Suga, Takashi, Uesaka, Kouichi
• Primary Examiner(s): Decady, Albert
• Assistant Examiner(s): Kerveros, James
• Application Number:
  US10/062,928
• Publication Number:
  US 20020167324A1
• Time in Patent Office: 1,054 Days
• Field of Search: 324/638, 324/627, 324/628, 324/637, 324/647, 324/765, 324/95, 343/703, 702/57
• US Class Current: 324/638
• CPC Class Codes: G01R 29/0814 Field measurements related to measuring influence on or from apparatus, components or humans EMC, EMI and similar testing in general G01R31/001, e.g. in ESD, EMI, EMC, EMP testing, measuring radiation leakage; detecting presence of micro- or radiowave emitters; dosimetry; testing shielding; measurements related to lightning

Abstract

A recording medium includes a computer readable program for controlling a computer. The program comprises (a) code for calculating a current distribution by using a strength and phase of magnetic field measured from a measuring object; (b) code for calculating a first electric field strength at a measuring point from the current distribution; (c) code for calculating a second electric field strength at the measuring point by using a current distribution of a predetermined position on a part of the current distribution of the measuring object; and (d) code for calculating a ratio related to the first electric field strength in association with the second electric field strength.

Claims

1. A recording medium including a computer readable program for controlling a computer, said program comprising:

(a) code for calculating a current distribution by using a strength and phase of magnetic field measured from a measuring object;

(b) code for calculating a first electric field strength at a measuring point from said current distribution;

(c) code for calculating a second electric field strength at said measuring point by using a current distribution of a predetermined position on a part of said current distribution of said measuring object; and

(d) code for calculating a ratio related to said first electric field strength in association with said second electric field strength.

2. A recording medium according to claim 1, wherein said code for (d) further includes:

code for calculating a difference between said first and second electric field strengths; and

code for calculating a ratio of said difference in relation to said first electric field strength.

3. A recording medium according to claim 1, wherein said code for (a) further includes:

code for inner-producing with a measured-magnetic field composite-complex vector and a calculated-magnetic field composite-complex vector.

4. A recording medium according to claim 1, wherein said program further includes:

code for displaying said current distribution with colors in response to said ratio.

5. A recording medium according to claim 4, wherein said code for displaying said current distribution includes code for displaying said current distribution in overlap with an actual circuit pattern.

6. A recording medium according to claim 1, wherein said program further comprising:

code for editing said current distribution to calculate a third electric field strength from an edited current distribution.

7. A recording medium including a computer readable program for controlling a computer, said program comprising:

code for calculating a first electric field strength at a measuring point from a current distribution, said current distribution having been obtained by using a strength and phase of a magnetic field measured from an object;

code for calculating a second electric field strength from said current distribution formed in accordance with externally inputted data; and

code for calculating a ratio related to said first electric field strength in association with said second electric field strength.

8. The recording medium according to claim 7, wherein said object is a measuring object.

9. A recording medium including a computer readable program, said program comprising:

code for calculating a current distribution by using a strength and phase of magnetic field measured from an object being measured;

code for calculating a first electric field strength at a measuring point from said current distribution;

code for calculating a second electric field strength at said measuring point by using a current distribution of a predetermined position on a part of said current distribution of said object;

code for calculating a ratio related to said first electric field strength in association with said second electric field strength; and

code for calculating a difference between said first and second electric field strengths;

code for calculating a ratio of said difference in relation to said first electric field strength.