Keysight N5244/45AS Option H85 User's And Service Manual page 32

N5244/45AS Option H85
Example: Making High Power Measurements With Option H85
4. Turn On the booster amplifier.
5. Measure the output power from the coupled arm and the open port "Coupler Output" of the
coupler, using a power meter and sensor.
Depending on the power used, additional attenuation may have to be added
NOTE
between the coupler and the power meter.
6. 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.
7. 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.
8. 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.
28 N5245-90002 User's and Service Guide