User’s Guide 21
E8362/3/4C Option H85
Example: Making High Power Measurements with Option H85
Initial Source Port Power Setup
1. In the Stimulus drop-down menu select Power > Power and Attenuators. In the
application window type [–20 dBm] into Port Power for Port 1. Verify that Port Powers
Coupled is checked to ensure that Ports 1 and Port 2 power levels are the same. Press
OK. Uncoupled ports should be used when adjusting the S12 power level.
2. Turn On the booster amplifier.
3. Measure the output power from the coupled arm and the open port “Coupler Output” of
the coupler, using a power meter and sensor.
NOTE Depending on the power used, additional attenuation may have to be added
between the coupler and the power meter.
4. Verify the gain of the booster amplifier(s). For example; if the analyzer output power
level was set to –20 dBm and the output power measured from the open end of the
coupler was –5 dBm, the gain of the booster amplifier would be +15 dB.
5. Verify that the power measured in the previous steps is within the acceptable limits
(less than –12 dBm for the coupled arm, less than +43 dBm for the open port). Estimate
the maximum power level needed to force the DUT into compression.
6. At the maximum estimated power level, determine if the maximum output power from
the coupled arm of the coupler will be higher than the acceptable limit. If so, add the
appropriate amount of attenuation that will keep the coupler arm output power below
–12 dBm.
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