Why is the accuracy of U200x Power Sensors not tested per sensor’s dynamic range?

The accuracy of those sensors is essentially a combination of linearity, instrumentation accuracy and traceability to absolute accuracy at 50MHz, 0dBm. In actuality, there is little necessity to test linearity of the those power sensors below -20dBm. Those power sensors' ability to track applied power is linear up to approximately -20dBm because the sensors use a diode detector which has an inherently predictable square law response. The response only becomes non-linear above -20dBm thus requiring characterization.

Where there is non-compliance with the specified accuracy at low power levels, it is unlikely to be caused by the sensors’ linearity. In this situation, it is recommended to first confirm compliance with the sensors’ zero drift and noise specifications. Non-compliance can only be corrected by repair/replacement of the sensor module.

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