Agilent Technologies U2000 Series Uživatelský manuál stáhnout pdf (Strana 12)

Zero and measurement noise

Power range

U2000/1/2/4A sensors

–60 dBm to –35 dBm

–38 dBm to –15 dBm

–20 dBm to –9 dBm

–11 dBm to –5 dBm

–7 dBm to 15 dBm

10 dBm to 20 dBm

U2000/1/2H sensors

–50 dBm to –25 dBm

–28 dBm to –5 dBm

–10 dBm to 1 dBm

–1 dBm to 5 dBm

3 dBm to 25 dBm

20 dBm to 30 dBm

U2000/1B sensors

–30 dBm to –5 dBm

–8 dBm to 15 dBm

10 dBm to 21 dBm

19 dBm to 25 dBm

23 dBm to 44 dBm

Zero set (internal)

±1.5 nW (±2.8 nW for U2004A)

±2 nW (±3 nW for U2004A)

±12 nW

±2 μW

±4 μW

±6 μW

±15 nW

±20 nW

±120 nW

±20 μW

±40 μW

±60 μW

±1.8 μW

±2 μW

±12 μW

±2 mW

±4 mW

Zero set (external)

±600 pW

±1.5 nW

±10 nW

±500 nW

±1 μW

±5 μW

±8 nW

±20 nW

±100 nW

±20 μW

±30 μW

±60 μW

±800 nW

±2 μW

±10 μW

±1 mW

±2 mW

Measurement noise

1 nW

1.5 nW

15 nW

650 nW

1 μW

10 μW

10 nW

15 nW

150 nW

6.5 μW

10 μW

100 μW

1 μW

1.5 μW

15 μW

650 μW

1 mW

Zero drift

200 pW

400 pW

1.5 nW

50 nW

500 nW

2 μW

2 nW

4 nW

15 nW

500 nW

5 μW

20 μW

200 nW

400 nW

1.5 μW

50 nW

500 μW

1. Condition: (i) 0 °C to 55 °C and (ii) 95% relative humidity at 40 °C non-condensing.

2. Within one hour after zero set, at a constant temperature, after a 24-hour warm-up of the power sensor.

3. The number of averages at 16 for Normal mode, measured over a one-minute interval and two standard deviations.

4. Noise per sample specifications are not applicable to U2004A. They are only applicable for gated power working range

as stated in the ‘Gate’ table on page 15.

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.

Example:

U2000A power sensor, –60 dBm to –35 dBm,

normal mode, number of averages = 4

Measurement noise calculation:

1 nW x 1.7 = 1.7 nW

No. of averages

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

128

0.55

0.53

256

0.39

0.34

1024

0.21

0.20

512

0.29

Specifications (continued)

Noise Per Sample

N/A

90 nW

1 μW

55 μW

85 μW

550 μW

N/A

900 nW

10 μW

550 μW

850 μW

5.5 mW

N/A

90 μW

1 mW

55 mW

85 mW

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 20 21

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