ESCO Technologies ETS-Lindgren 7405, User Manual, Page: 46 / 49

46 Common Diagnostic Techniques www.ets-lindgren.com
E
VALUATING
A
LTERNATE
S
OLUTIONS
There are two approaches that yield good results when evaluating alternate
design solutions:
1. The first step in each procedure is to choose a set of points; for
example, two to six points. Since the object is to determine what the
far-field results will be, most of the points should be one to four meters
away. Also, choose one or two points close to the source. If a solution
results in a dramatic reduction, this point may be the only one that will
allow quantitative measurement of the reduction.
The placement of ground straps
changes the geometry of the radiating current loop.
A ground strap may reduce the signal, but it will also redirect it.
To properly assess the modification,
the perimeter of the unit must be scanned.