Distance And Spot Size - Fluke 568 User Manual

56x
Users Manual

Distance and Spot Size

As the distance (D) from the object being measured increases, the spot size (S)
of the area measured by the unit becomes larger. The relationship between
distance and spot size (D:S) for each unit is shown in Figure 7. The spot sizes
indicate 90 % encircled energy.
18
Shop for Fluke products online at:
D:S=12:1
561 132 mm @
1500 mm
75 mm @
900 mm
38 mm @
300 mm
3 " @
36 "
1.5 " @
12 "
568
Figure 7. Distance and Spot Size
MyFlukeStore
www.
S
5.3 " @
60 "
D
.com
eyl06a.eps
1.877.766.5412