Boonton 4500B Peak Power Meter Manual de usuario descargar pdf (Pagina 331)

Boonton 4500B RF Peak Power Analyzer

Application Notes

6-21

Step 3: The Calibrator Mismatch Uncertainty is calculated using the formula in the previous section, using the 1 GHz



CAL



SNSR





CAL





SNSR

= (1.15 - 1) / (1.15 + 1) = 0.070 (calculate reflection coefficient of 57518, max SWR = 1.15 at 1 GHz)

CalMismatch



CAL



SNSR

× 100 %

= ±2 × 0.091 × 0.070 × 100 %

= ±1.27%

Step 4:                



SRCE



SNSR





SRCE

= 0.057 (source reflection coefficient at 900 MHz)



SNSR

= (1.15 - 1) / (1.15 + 1) = 0.070 (calculate reflection coefficient of 56518, max SWR = 1.15 at 0.9 GHz)

SourceMismatch



SRCE



SNSR

× 100 %

= ±2 × 0.057 × 0.070 × 100 %

= ±0.80%

Step 5: T               



frequency-dependent porti

ShapingError

= ±2.0 %

Step 6: The Sensor Temperature Drift Error depends on how far the temperature has drifted from the sensor calibration

temperature, and the temperature coefficient of the sensor. In our case, we are using a temperature compensated sensor, and

the temperature has drifted by 11 degrees C (49C - 38C) from the AutoCal temperature. We will use the equation in the

previous section to calculate sensor temperature drift uncertainty.

SnsrTempDrift

= ± (0.93% + 0.069% /degreeC)

= ± (0.93 + (0.069  11.0)) %

= ± 1.69%

Step 7: This is a relatively high-

 

two

figures.

Noise&Drift

= ± Sensor Noise (in watts) / Signal Power (in watts)

= ±50.0e-9 / 20.0e-3  100 %

= ±0.0003%

Step 8: 



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