Patent ID: 7315171
Filing Date: 2008-01-01
Classification: G01R

Abstract:
1. An electronic apparatus with an electronic judging function for a working state of an other electric equipment by measuring an electric common mode noise current passing through a power supplying electric wire to the said other electric equipment and by comparing the electric common mode noise current value on measuring time with the electric common mode noise current value on non-working time of the said other electric equipment, wherein the electric common mode noise current is measured by using ferrite magnetic cores with paired electric winding wires or twisted electric winding wires situated at around the power supplying electric wire to the said other electric equipment; and wherein the electric common mode noise terminal voltage value is ranged under the line connected between the two points of (10 KHz, 91 dB μ V) and (150 KHz, 70 dB μ V) in the frequency region from 10 KHz to 150 KHz on the rectangular coordinates figure shown with the vertical linear axis for Noise Terminal Voltage and horizontal logarithmic axis for Frequency; and wherein the electric common mode noise terminal voltage value is ranged under 65 dB μ V in the frequency region from 150 KHz to 450 KHz on the rectangular coordinates figure shown with the vertical linear axis for Noise Terminal Voltage and horizontal logarithmic axis for Frequency; and wherein the electric common mode noise terminal voltage value is ranged under 45 dB μ V in the frequency region from 450 KHz to 30 MHz on the rectangular coordinates figure shown with the vertical linear axis for Noise Terminal Voltage and horizontal logarithmic axis for Frequency.