U2000SLASH1SLASH2H datasheet(14/26 Pages) KEYSIGHT

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Specifications (continued)

Effects of averaging on noise:

Averaging over 1 to 1024 readings

is available for reducing noise. The

table below provides the measure-

ment 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

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

measurement noise table.

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