ETS-Lindgren 7405 E & H Near Field Probe Set - Manual (Page 37)

www.ets-lindgren.com Common Diagnostic Techniques 37
Distance: A to B = 1.5 2.0 3.0
Propagating Field: 1/R –3.52 dB –6.02 dB –9.54 dB
Reactive Field: 1/R
3 –10.57 dB –18.06 dB –28.63 dB
After the source is identified, two or three angles of approach are measured.
A typical situation would record two points at 0.5 meters and 1.5 meters from the
source along two radials from the source. The signal is measured at each point
with a probe which is highly selective of the H-field and another probe which is
highly selective of the E-field. The rate of fall-off is noted for each probe and the
relative amplitude between the probes is noted. In deciding what the relative
amplitude is, the conversion factor of each probe must be taken into account.