Atek HP 8753D, Руководство пользователя, Страница: 281 / 677

P ower Coupling Options
There are two methods you can use to couple and uncouple power levels with the HP 8753D:
channel coupling
port coupling
By uncoupling the channel powers , you eectively have two separate sources . Uncoupling the
test ports allows you to have dierent power levels on each port.
Channel coupling
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CHAN POWER [COUPLED] toggles between coupled and uncoupled channel power . With the
channel power coupled, the power levels are the same on each channel. With the channel
power uncoupled, you can set dierent power levels for each channel. F or the channel
power to be uncoupled, the other channel stimulus functions must also be uncoupled
(
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COUPLED CH OFF ).
T est port coupling
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PORT POWER [COUPLED] toggles between coupled and uncoupled test ports . With the test
ports coupled, the power level is the same at each port. With the ports uncoupled, you can
set a dierent power level at each port. This can be useful, for example , if you want to
simultaneously perform a gain and reverse isolation measurement on a high-gain amplier using
the dual channel mode to display the results . In this case , you would want the power in the
forward direction (S
21
) much lower than the power in the reverse direction (S
12
).
Application and Operation Concepts 6-15