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Microwave Engineering
book

Microwave Engineering

by Ahmad Shahid Khan
May 2014
Intermediate to advanced content levelIntermediate to advanced
800 pages
24h 50m
English
CRC Press
Content preview from Microwave Engineering
373Microwave Measurements
From Joules–Lenz’s law
Q = 0.24 I
2
R t = 0.24 Pt (10.20b)
Thus, Q = W ΔT = 0.24 Pt (10.20c)
P = W ΔT/0.24 t = 4.17 W ΔT/t (10.20d)
where P is the unknown power (to be measured) and t is the measurement
time. The volume W is determined as the difference between readings of
total ow meter at the beginning and at the end of the observation.
The temperature difference is measured by thermometers or by thermo-
couples after a steady state is reached. With thermocouples connected in
series opposition, the micro-ammeter may be calibrated in unit of ΔT. If, in
addition, the rate of ow of water (u = W/t) is maintained constant, the cali-
bration may be directly obtained in the units of power (P = 4.1 u ΔT = a
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Publisher Resources

ISBN: 9781466591417