Series 8650A Universal Power Meters - Giga-tronics

Adjustments & Performance Tests2.3.4 Instrument Plus Power Sensor LinearityTest DescriptionConnect the test setup as shown in Figure 2-5. The linearity will be tested over the range +20 dBm to-60 dBm. At low power levels, the linearity measurement will include the uncertainty due to the zero setspecification. The procedure should be repeated for each sensor used with the 8650A.Figure 2-5: Power Linearity Test SetupWhen measuring the linearity of a high power sensor, the power output of the source as well as thedirectional coupler coupling factor, must be increased. The power coefficient of the step attenuator willalso have to be considered. The specification of power coefficient for the Weinschel attenuator cited inthe Equipment List is: