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微波测量基础CH02_2功率
2.2 微波功率测量
How Do You Know Your
Microwave is Working?
Why Not Measure Voltage?
DC Low Frequency
+ Z Z
S S
2
V ± R P = IV = V /R R
L V L
–
I I
High Frequency
Z
S • I and V vary with position
R
L
Z • Power is constant
O AC component of
P powerDC component of
V Inc Amplitu power
de
V Ref t
I
V
• At frequencies below approximately 10MHz, current, voltage, and
resistance can be measured and power can be calculated relatively
easily.
• At higher frequencies, measuring current becomes more difficult but
power can be measured “directly.”
• Power is measured “directly” using a power meter which includes a
power sensor and readout electronics.
• The dynamic power range and frequency range of the meter are
determined by the sensor design.
• Sensors are usually separate and interchangeable.
• Power measurements are important in the development, production,
and servic
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