64 Electronic Balancing Tool EBT730/EBT731
0.032dia
0.135dia
0.321dia
0.679dia
0.865dia
0.968dia
dia
Figure 31: Location of Measuring Points when Traversing a
Round Duct using Log-Tchebycheff Method
#of Measuring
Points
Per Diameter
Position Relative to Inner Wall
0.032, 0.135, 0.321, 0.679, 0.865, 0.968
0.021, 0.117, 0.184, 0.345, 0.655, 0.816, 0.883, 0.979
0.019, 0.077, 0.153, 0.217, 0.361, 0.639, 0.783, 0.847, 0.923, 0.981
Before taking the measurement, multiply the numbers in the table times the duct diameter to get insertion
depth for the probe. (Do not forget to use the inside dimension of the duct if it is lined with insulation.)
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