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FSP REF VALUE Tracking Generator - Option FSP-B9 The REF VALUE softkey activates the input of a value which is assigned to the reference line. With default settings the reference line corresponds to a difference of 0 dB between the currently measured trace and the reference trace. Setting the REF VALUE to a different value helps to compensate for changes to the level conditions in the signal path after the calibration data have been recorded. If eg after a source calibration a 10 dB attenuation is inserted into the signal path between DUT and FSP input, the measurement trace will be moved by 10 dB down. Entering a REF VALUE of –10 dB will then result in the reference line for difference calculation being moved by 10 dB down as well. This means that the measured trace will be placed on it, as displayed in figure 4-20. REF VALUE always refers to the active window. Fig. 4.21-5 Measurement with REF VALUE -10 dB and REF VALUE POSITION 50% 1164.4556.12 4.21-9 E-1
