Keysight 8478B, Руководство по эксплуатации и обслуживанию

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28 Keysight 8478B Thermistor Mount
Operating Principles
General Operation
3-
431 Power Meter Detector
Under normal operation, the total power supplied to heat thermistor pair “D”
(see Figure 3-2 ) consists of:
1. RF signal
2. 10 kHz bias
3. heat from the environment
The total power supplied to heat thermistor pair “C” consists of:
1. dc bias
2. an equal amount of 10kHz bias
3. heat from the same environment
As “D” and “C” are matched thermally, the total amounts of heat applied to
reduce their series resistance equally must be equal.
Figure 3-2 8478B Connected to a 431C Power Meter