Agilent Technologies U2000 Series Manual de servicio descargar pdf (Pagina 71)

Specifications and Characteristics 3

U2000 Series Operating and Service Guide 55

Effects of Averaging on Average only Mode Measurement Noise

Averaging over 1 to 1024 readings is available for reducing noise. The

previous tables provide the measurement noise for a particular sensor. Use

the noise multiplier in Table 3- 4 for the appropriate speed (Normal or

x2), and the number of averages to determine the total measurement noise

value.

Table 3-4 Noise Multiplier for Average only Mode

Example:

U2000A power sensor, –60 dBm to –35 dBm, number of averages = 4,

normal speed.

Measurement noise calculation:

1 nW x 1.7 = 1.7 nW

Number of Averages

1 2 4 8 16 32 64 128 256 512 1,024

Noise Multiplier (s)

(Normal Speed)

2.0 1.8 1.7 1.5 1.0 0.95 0.74 0.55 0.39 0.29 0.21

Noise Multiplier (s)

(x2 Speed)

2.7 2.4 2.0 1.6 1.0 0.91 0.78 0.53 0.34 0.29 0.20

1 2 ... 66 67 68 69 70 71 72 73 74 75 76 ... 98 99

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Agilent Technologies U2000 Series Manual de servicio Pagina 71