Boonton 4540 Peak Power Meter User Manual Instrukcja Użytkownika Strona 237
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Boonton 4540 Series RF Power Meter
Application Notes
6-9
7. The process locates the bottom amplitude (baseline) using the IEEE histogram method. A histogram is
generated for all samples in the lowest 12.8 dB range of sample values. The range is subdivided into 64
power levels of 0.2 dB each. The histogram is scanned to locate the power level with the maximum number
of crossings. This level is designated the baseline amplitude. If two or more power value have equal counts,
the lowest is selected.
8. The process follows a similar procedure to locate the top amplitude (top line). The power range for the top
histogram is 5 dB and the resolution is 0.02 dB, resulting in 250 levels. The level-crossing histogram is
computed for a single pulse, using the samples which exceed the transition threshold. If only one transition
exists in the buffer (Types 2 and 3), the process uses the samples that lie between the edge of the screen and
the transition threshold (See Figure 6-6). For a level to be designated the top amplitude, the number of
crossings of that level must be at least 1 ¤16 the number of pixels in the pulse width; otherwise, the peak
value is designated the top amplitude.
9. The process establishes the proximal, mesial, and distal levels as a percentage of the difference between top
amplitude and bottom amplitude power. The percentage can be calculated on a power or voltage basis. The
proximal, mesial, and distal threshold values are user settable from 1% to 99%, with the restriction that the
proximal < mesial < distal. Normally, these values will be set to 10%, 50% and 90%, respectively.
Figure 6-6.
Time Interpolation
10. The process determines horizontal position, in pixels, at which the signal crosses the mesial value. This is done
to a resolution of 0.1 pixel, or 1/5000 of the screen width. Ordinarily, the sample values do not fall precisely on
the mesial line, and it is necessary to interpolate between the two nearest samples to determine where the mesial
crossing occurred. This process is demonstrated in the example above (Figure 6-6):
- SAFETY SUMMARY 3
- Contents 10
- 1. General Information 15
- 1.2 Description 16
- General Information 16
- 1.3 Features 17
- 1.4 Accessories 19
- 1.6 Specifications 20
- 2. Installation 25
- Installation 26
- 2.2 Power Requirements 26
- 2.3 Connections 26
- 2.4 Preliminary Check 27
- 3. Getting Started 29
- Getting Started 30
- 3.3 LCD Monitor Display 34
- 3.4 Initialize 38
- Caution 38
- 3.5 Calibration 42
- STEP PROCEDURE 42
- 3.6 Making Measurements 45
- 4. Operation 49
- 4.3 Numerical Data Entry 50
- 4.4 Sensor Calibration 51
- 4.5 Menu Reference 52
- Operation 100
- 4.6 Cal/Zero Key Menu 134
- 5. Remote Operation 135
- Remote Operation 136
- 5.4 SCPI Language 136
- 5.6 SCPI Command Reference 140
- 6. Application Notes 229
- Application Notes 230
- 6.2 Pulse Definitions 233
- 6.3 Automatic Measurements 234
- 6.5 Measurement Accuracy 244
- 7. Maintenance 255
- Appendix A 256
- 7.5 Firmware Upgrade 256
- 8.1 SCPI Error Messages 259
- Appendix B 263
- 9.1 Description 263
- 9.2 Accessories 263
- 9.3 Optional Configurations 263
- 9.4 Specifications 264
- 9.5 Connections 265
- 10. Appendix C Boonton EULA 267
- Appendix C 268
- Appendix D 269
- Repair Policy 269
- Limited Warranty 269
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