APD Mode Operating Instructions 13-3
13.2.1 Entering the
function
The Amplitude Probability Distribution mode can be used when
measuring signals in the frequency range from 30 MHz on with
9030/9060/9180.
As soon as 9030/9060/9180 is connected and switched on, turning on the
9010 provides the APD button appearing at the function keys 4
th
position
from the top (see picture).
Obviously the PMM 9030/9060/9180 unit must be connected to the 9010 to
allow operating in the higher frequency bands.
This is a very powerful and innovative function for an EMI receiver. To enter
this mode simply depress the APD soft key on the main screen and the APD
setup window will pop up immediately, allowing operator to set parameters
for the measure. All these settings (Limits, Frequencies, Hold Time etc.)
refer to the each specific product standard and can be preset by pressing
the Default key.
13.2.2 Methods
The Amplitude Probability Distribution is a statistical characterization of
signals. Measurements are based on 1 MHz RBW and have to be performed
over a number of frequencies typically above 1 GHz, but can also be carried
out 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 E
meas
related
to specified P
limit
In this case EUT complies with the standard if E
meas
is less or equal to E
lim
For Method 2 (P) it is necessary to measure the probability of time P
meas
during which the disturbance envelope exceeds the limit E
lim
In this case EUT complies with the standard if P
meas
is less or equal to P
lim
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