Patent ID: 7652485

Claim:
A method of measuring electromagnetic field intensity using a measuring apparatus for electromagnetic field intensity, the measuring apparatus having (a) an input responsive to a plurality of signals, (b) a frequency converting arrangement for frequency converting the plurality of signals, (c) a measuring arrangement for digitally converting the frequency converted signals, (d) a memory arrangement for storing the digitally converted signals, (e) an arithmetic arrangement for subjecting the stored signals to arithmetic operation, and (f) a display arrangement for displaying the result of the arithmetic operation, the method comprising: inputting, in said input, (g) a plurality of output signals adapted to be derived by a measuring conductor in different directions relative to the electromagnetic field, and (h) a reference signal detected by a reference signal conductor, subjecting, in said frequency converting arrangement, the output signals and the reference signal to frequency conversion with the same reference frequency conversion signal obtained from a first oscillator, and subjecting, in said measuring arrangement, the frequency converted output signals and the frequency converted reference signal to digital conversion with the same reference clock signal obtained from a second oscillator.