Agilent Technologies 8719D, User Manual

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Channel Mode with Decoupled Channel Power
By decoupling the channel power or port power and using the dual channel mode, you can
simultaneously view two measurements (or two sets of measurements if both auxiliary
channels are enabled), having different power levels.
Note Auxiliary channels 3 and 4 are permanently coupled by stimulus to primary
channels 1 and 2 respectively. Decoupling the primary channels’ stimulus from
each other does not affect the stimulus coupling between the auxiliary channels
and their primary channels.
However, there are two configurations that may not appear to function “properly”.
1. Channel 1 requires one attenuation value and channel 2 requires a different value. Since
one attenuator is used for both testports, this would cause the attenuator to continuously
switch
power ranges.
2. With Option 007 (mechanical transfer switch), channel 1 is driving one test port and channel
2 is driving the other test port. This would cause the test port transfer switch to continually
cycle. The instrument will not allow the transfer switch or attenuator to continuously
switch ranges in order to update these measurements without the direct intervention of the
operator.
If one of the above conditions exists, the test set hold mode will engage, and the status
notation will appear on the left side of the screen. The hold mode leaves the measurement
function in only one of the two measurement paths. update both measurement setups,
press Refer to “Source Attenuator Switch Protection” earlier in this
chapter for more information on this condition.
Application and Operation Concepts