Boonton 4540 Peak Power Meter User Manual Manual de usuario descargar pdf (Pagina 239)

Boonton 4540 Series RF Power Meter

Application Notes

6-11

12. The processor calculates the output values according to the following definitions:

a.) Pulse Width Interval between mesial points

b.) Risetime See Step 11

c.) Falltime See Step 11

d.) Period Cycle time between mesial points

e.) Pulse Repetition Frequency Reciprocal of Period

f.) Duty Cycle Pulse Width/Period

g.) Off-time (Period) - (Pulse Width)

h.) Peak Power Maximum sample value (See Step 1)

i.) Pulse Power Average power in the pulse (between the mesial points)

j.) Overshoot (Peak Power) - (Top Amplitude)

k.) Average Power See Step 13

l.) Top Amplitude See Step 8

m.) Bottom Amplitude See Step 7

n.) Skew See Step 14

6.3.4 Average Power Over an Interval

13. The average power of the signal over a time interval is computed by:

a.) summing the sample powers in the interval

b.) dividing the sum by the number of samples

This process calculates Pulse Power, Average Power and the average power between markers.

Since each sample represents the power in a finite time interval, the endpoints are handled separately to avoid

spreading the interval by one-half pixel at each end of the interval (See Figure 6-7). For the interval in Figure 6-

7, the average power is given by:

1 2 ... 234 235 236 237 238 239 240 241 242 243 244 ... 269 270

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Boonton 4540 Peak Power Meter User Manual Manual de usuario Pagina 239