Agilent Technologies U2000 Series Manual de usuario descargar pdf (Pagina 14)

Specifications (continued)

Effects of averaging on noise:

Averaging over 1 to 1024 readings is

available for reducing noise. The table

below provides the measurement

noise for a particular sensor with the

number of averages set at 16 (for

normal mode) and 32 (for x2 mode).

Use the noise multiplier, for the

appropriate of averages, to determine

the total measurement noise value.

Average only Mode

Number of averages 1 2 4 8 16 32 64 128 256 512 1024

Noise multiplier

Normal mode

x2 mode

2.0

2.7

1.8

2.4

1.7

2.0

1.5

1.6

1.0

0.95

0.91

0.74

0.78

0.55

0.53

0.39

0.34

0.29

0.21

0.20

Example:

U2000A power sensor, –60 to

–35dBm, normal mode, number of

averages = 4

Measurement noise calculation:

1 nW x 1.7 = 1.7 nW

Effect of time-gating and averaging

on normal mode measurement noise:

The normal mode measurement

noise wil depend on the gate length

(time-gated period in second) and the

number of averages. The noise can

be approximately calculated with the

following equations.

If the gate length is < 2.73 µs, use Equation 1:

Noise = Noise per sample

Number of averages

Otherwise, use Equation 2:

Noise = Noise per sample

1/4

Number of averages

(

Gate length/(0.68 µs)

)

Note: If the noise value obtained

from Equation 1 or 2 is lower than the

measurement noise specification, use

the value as specified in the measure-

ment noise table.

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 23 24

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Agilent Technologies U2000 Series Manual de usuario Pagina 14

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