APD Mode Operating Instructions 13-313.2.1 Entering thefunctionThe Amplitude Probability Distribution mode can be used whenmeasuring signals in the frequency range from 30 MHz on with9030/9060/9180.As soon as 9030/9060/9180 is connected and switched on, turning on the9010 provides the APD button appearing at the function keys 4th positionfrom the top (see picture).Obviously the PMM 9030/9060/9180 unit must be connected to the 9010 toallow operating in the higher frequency bands.This is a very powerful and innovative function for an EMI receiver. To enterthis mode simply depress the APD soft key on the main screen and the APDsetup window will pop up immediately, allowing operator to set parametersfor the measure. All these settings (Limits, Frequencies, Hold Time etc.)refer to the each specific product standard and can be preset by pressingthe Default key.13.2.2 Methods The Amplitude Probability Distribution is a statistical characterization ofsignals. Measurements are based on 1 MHz RBW and have to be performedover a number of frequencies typically above 1 GHz, but can also be carriedout below.Two methods are defined: the first “E based” and the second “P based”.For Method 1 (E) it is necessary to measure disturbance level Emeas relatedto specified P limitIn this case EUT complies with the standard if E meas is less or equal to E limFor Method 2 (P) it is necessary to measure the probability of time Pmeasduring which the disturbance envelope exceeds the limit E limIn this case EUT complies with the standard if P meas is less or equal to P lim
