HP HP 8753E, User Manual, Page: 297 / 699

Power Coupling Options
There are two methods you can use to couple and uncouple power levels with the HP 87533:
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channel coupling
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port coupling
By uncoupling the primary channel powers, you effectively have two separate sources.
Uncoupling the test ports allows you to have different power levels on each port.
Channel coupling
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the channel power coupled, the power levels are the same on each channel. With the channel
power uncoupled, you can set different power levels for each primary channel. For the
channel power to be uncoupled, the other channel stimulus functions must also be uncoupled
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port collpling
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ports coupled, the power level is the same at each port. With the ports uncoupled, you can
set a different 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 amplifier using
the dual channel mode to display the results In this case, you would want the power in the
forward direction much lower than the power in the reverse direction
6-16 Application and Operation Concepts