Method and apparatus of electromagnetic measurement
First Claim
1. A method of electromagnetic measurement, comprising:
- directing an electromagnetic field sensor having directivity, such that a received band is widened in accordance with a measurement distance toward a device under test; and
receiving an electromagnetic wave from the device under test while shifting the received band in sequence to thereby detect electromagnetic interference,wherein a plurality of long and short measurement distances between the device under test and the electromagnetic field sensor are set,measurement at the long measurement distance is performed a plurality of times, andmeasurement at the short measurement distance is performed only on a received band where electromagnetic interference is detected by the measurement at the long measurement distance.
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Accused Products
Abstract
In order to direct a probe having directivity that a received band is widened in accordance with a measurement distance, toward a DUT, shift the received band of the probe in sequence, receive electromagnetic, and measure electromagnetic interference, a plurality of long and short measurement distances between the probe and the DUT are set, and measurement at the long measurement distance and measurement at the short measurement distance are performed plural times. Herein, the measurement at the short measurement distance is performed on a received band where electromagnetic interference is measured by the measurement at the long measurement distance. Thus, measurement of electromagnetic interference can be performed with high accuracy in a short time.
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Citations
7 Claims
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1. A method of electromagnetic measurement, comprising:
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directing an electromagnetic field sensor having directivity, such that a received band is widened in accordance with a measurement distance toward a device under test; and receiving an electromagnetic wave from the device under test while shifting the received band in sequence to thereby detect electromagnetic interference, wherein a plurality of long and short measurement distances between the device under test and the electromagnetic field sensor are set, measurement at the long measurement distance is performed a plurality of times, and measurement at the short measurement distance is performed only on a received band where electromagnetic interference is detected by the measurement at the long measurement distance. - View Dependent Claims (2, 3)
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4. A method for measuring electromagnetic interference, comprising:
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providing an electromagnetic field sensor having a directional detection field, such that a detection surface area of a test device increases as the electromagnetic field sensor moves farther away from the test device, setting the electromagnetic field sensor a first distance from the test device, detecting electromagnetic interference from a plurality of detection areas on the test device, setting the electromagnetic field sensor to a second distance from the test device shorter than the first distance from the test device, detecting electromagnetic interference at the second distance only in the detection areas in which electromagnetic interference was detected at the first distance. - View Dependent Claims (5, 6, 7)
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Specification