Boonton 4500B Peak Power Meter Manual de usuario descargar pdf (Pagina 318)

Boonton 4500B RF Peak Power Analyzer

Application Notes

6-8

Automatic Measurement Sequence

The automatic measurement process analyzes the captured signal data in the following sequence:

1. Approximately 500 samples of the waveform (equivalent to one screen width)

are scanned to determine the maximum and minimum sample amplitudes.

2. The difference between the maximum and minimum sample values is calculated

and stored as the Signal Amplitude.

3. The Transition Threshold is computed as one-half the sum of the maximum and

minimum sample amplitudes.

4. The processor locates each crossing of the Transition Threshold.

5. Starting at the left edge of the screen, the processor classifies each Transition

threshold crossing according to whether it is positive-going ( +) or negative-

going (+ ). Because the signal is repetitive, only three transitions are needed to

classify the waveform, as follows:

Type Sequence Description

0 none No crossings detected

1 Not used

2 +  One falling edge

3  + One rising edge

4 +  + One falling, followed by one rising edge

5  +  One rising, followed by one falling edge

6 +  +  Two falling edges

7  +  + Two rising edges

Figure 6-5.

Step Waveforms

6. If the signal is Type 0, (No crossings detected) no measurements can be

performed and the routine is terminated, pending the next reload of the data

buffers.

1 2 ... 313 314 315 316 317 318 319 320 321 322 323 ... 371 372

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Boonton 4500B Peak Power Meter Manual de usuario Pagina 318