Bird-technologies 5015 Series-Manual Instrukcja Użytkownika Pobierz pdf (Strona 18)

Example - If a sensor has a specified accuracy

of 5% of reading + 1.0 uW, then for a 10 mW

signal the uncertainty is ± 0.501 mW. For a 1

mW signal the measurement uncertainty is

± 0.051 mW.

Sensor Uncertainty

While this value is a good estimate, the sensor is actu-

ally more accurate. The sensor’s accuracy also depends

on the temperature, and the power and frequency of

the source;

Table 1 lists some examples of uncertainty

factors. If an uncertainty is given as a power, divide

this value by the measured RF power and convert to a

percentage. For example, an uncertainty of ±

0.25 µW

with a RF power of 10 µW is a 2.5% uncertainty.

Table 2 lists external factors, such as using attenua-

tors or using a cable to connect the TPS to the trans-

mitter, which could affect the measurement

uncertainty.

Table 1 - Example Uncertainty Factors

Error Source Conditions Uncertainty

Calibration

Uncertainty

± 1.13%

Frequency

Response

40 MHz to 4 GHz ± 3.42%

Temperature

Linearity

–10 to +50 °C ± 3.43%

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 30 31

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Bird-technologies 5015 Series-Manual Instrukcja Użytkownika Strona 18