ETS-Lindgren 7405 E & H Near Field Probe Set - Manual (Page 19)

www.ets-lindgren.com Typical Performance Factors 19
5.0 Typical Performance Factors
The following graphs represent typical measurement. Individual probe
results may vary.
Probe performance factor is defined as the ratio of the field presented to the
probe to the voltage developed by the probe at the BNC connector, PF = EN. By
adding the performance factor to the voltage measured from the probe, the field
amplitude may be obtained.
All probes in the Model 7405 Near-Field Probe Set were characterized in a
transverse electromagnetic mode (TEM) cell which presented a 377 ohm field.
The H-field probes only respond to the H-field; however, the equivalent E-field
response is graphed. This may be done if the field is assumed to be a
plane wave with an impedance of 377 ohms. The reason for graphing the factors
this way is to allow estimation of the strength of the far-field. If H-field amplitude
is desired, subtract 51.52 dB from the performance factor as indicated on the
graph.