Models LB480A/LB680A
USB Powe™
Product Manual PPA (Pulse Profiling Application)
Revision: 08/02/11
35
edge anywhere within the measurement window as defined by the gates.
Crest Factor
Crest factor is the difference between the peak power and the average power in any measurement window defined by
gate edges. This measurement proceeds by first taking a peak power measurement, then an average power
measurement. Then the measurement takes the difference between the two measurements and reports the result.
Droop
Measures the slope of the top of a pulse. The measurement is very sensitive to gate positions. Droop calculates the
average power of the first 5% the samples following the left gate then takes the average of 5% of the samples
immediately preceding the right gate. The difference between the two is droop in dB.
Overshoot
Reports the difference between the highest point between a rising edge and a pulse top. The position of the gate for
overshoot measurements are identical to the positioning of the gate for rise time measurements.
Power Set
Returns a series of three measurements. These measurements are pulse power, peak power and crest factor for a
selected gate.
Time & Frequency Set
Returns a pulse width, PRT and PRF measurement for a selected gate.
Mixed Set
Returns a peak power, crest factor, pulse width and PRF measurement for a a selected gate.
Set Position
The
Set Position
selection on the measurement list shown below allows you to precisely set the gate end points
– just
like for markers. Here we access the list from the
Results
pane and not the gates toolbar.
