Bird-technologies 5015 Series-Manual Manual de usuario descargar pdf (Pagina 19)

Table 2 - External Factors

Error Source Conditions

The root sum square (RSS) uncertainty is the industry

standard met

hod for combining independent uncer-

tainties. To determine the TPS's RSS uncertainty:

1. Square each uncertainty factor.

Add these values together.

a. Take the square root of this sum.

Other

< 40 °C or > 100 MHz ± 0.50%

Resolution ± ½ smallest displayed digit

(e.g. for a mW scale, three decimal

places are displayed. ½ the smallest is

0.5 µW)

Zero Set

†

± 0.125 µW

Noise

above 1.05 mW ± 0.7 µW

105 µW to 1.05 mW ± 0.4 µW

below 105 µW ± 0.2 µW

a. Above 40 °C, when making measurements at frequencies

between 40 and 100 MHz, add 1.1%.

b. After a 5 minute warm-up, measured over a 5 minute

interval and 2 standard deviations

Attenuator

Uncertainty

Frequency dependent

Cable Uncertainty Frequency and length dependent

(± 5% at 1 GHz for a ‘reasonable’

1.5 m cable)

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 30 31

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Bird-technologies 5015 Series-Manual Manual de usuario Pagina 19