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NRP-Z21.02
Rohde & Schwarz NRP-Z21.02 Other Test Equipment

ROHDE & SCHWARZ NRP-Z21.02

Average power sensor for universal use 10 MHz - 18 GHz, 200 pW - 200 mW, N(m)

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NRP-Z21.02
Average power sensor for universal use 10 MHz - 18
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NRP-Z21.02 PRODUCT OVERVIEW  
 

S-parameter correction compensates for the losses and reflections introduced by a component – such as an attenuator, directional coupler, or matching pad – that is attached to a power sensor. Using S-parameters instead of a fixed offset makes measurements more accurate by accounting for the interaction between the sensor and a component. This shifts the sensor's reference plane from the sensor's RF connector to the input of the device that is being applied externally. This application note explains the fundamentals of using S-parameters and discusses some common applications in which S-parameter correction is useful. It also introduces a command line tool for updating S-parameter data in custom applications or in automated test setups. 

All R&S?NRP-Z power sensors make it possible to compensate for the influence of any two-port devices between the signal source and the sensor input. As a result, it is possible to calculate the power P that the signal source actually delivers. Examples of such two-port devices include attenuators, matching pads, minimum-loss pads and waveguide adapters. One precondition for such compensation is that a complete set of S-parameter data must be available for the two-port device in the frequency range required by the application. 

The sensor's internal set of factory calibration data contains a table with frequency points that cover the entire operating frequency range of the sensor. Users can select the frequency points in the two-port S-parameter table independently of the sensor's factory calibration frequencies, which allows optimal coverage of the two-port frequency range of interest. The S-parameter's real parts and the imaginary parts are interpolated linearly between the frequency points. For the range below the first and above the last frequency, the values of the first and the last frequency are used, respectively. 

S-parameter data sets are stored in the sensor's internal calibration data structure. As a result this data is not lost during a device reset or a power cycle. In addition, S-parameter data can be configured such that it becomes active automatically when the sensor is powered up. This feature is useful if a two-port device such as an attenuator pad is permanently attached to a sensor. 
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