•儀器間接量測法 (Indirect Method to Test)
–Site I (Chamber)
•Testing sensor
•Testing cable
•Directional coupler
•Attenuator
•Testing instrument to measure power from directional coupler by testing sensor
–Site II (Field)
•Testing antenna
•Testing transmission-line
•Testing instrument to measure power density from space by testing antenna (suppose that the sensitivity of the instrument which can measure power density is better than that of the instrument which can measure power directly)
–Procedure
•Measure the first power density at site II-1 and derive the regarding first power
•Measure the corresponding power from directional coupler at site I, calculate the first power referring to site II-1, and record the first power difference between two measurements
•Monitor the second power density at site II-2, adjust attenuator at site I such that the second power density at site II-2 is equal to the first power density at site II-2, read the corresponding power from directional coupler at site I, and record the attenuation offset from attenuator
•The second power is equal to the first power offset by attenuation and with tolerance of that first power difference
•Error analysis: if the environments of site II-1 and II-2 are totally different, then calculation using same rule-of-thumb propagation model for site II-1 and II-2 may generate big error.
•儀器比較量測法 (Comparison Method to Test)
–Reference emitter for comparison
–Reference isolator for comparison
–Error analysis: if any of reference emitter and/or reference isolator are not well calibrated, then the measurement which uses any may generate error.
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