Agilent Technologies U2000 Series Manual de servicio descargar pdf (Pagina 73)

Specifications and Characteristics 3

U2000 Series Operating and Service Guide 57

For U2000/1B

Effect of Time-Gating and Averaging on Normal Mode Measurement Noise

The normal mode measurement noise will 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:

Otherwise, use Equation 2:

Range

Zero Set (Internal) Zero Set (External) Zero Drift

Measurement

Noise

Noise Per

Sample

–8 dBm to 15 dBm 47 µW 43 µW 25 µW 28 µW 90 µW

10 dBm to 23.5 dBm 530 µW 480 µW 230 µW 300 µW 1 mW

22.5 dBm to 28 dBm 30 mW 27 mW 19 mW 20 mW 55 mW

26 dBm to 44 dBm 32 mW 34 mW 24 mW 21 mW 85 mW

1 Condition: (i) 0 °C to 55 °C and (ii) 40 °C, 95% relative humidity.

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

3 The number of averages at 1 for Normal speed, gate length of 2.27 ms, measured over one minute interval and two standard

deviations.

4 The Noise Per Sample specification is only applicable for gated power working range stated in the “Normal Mode Key

Specifications and Characteristics” on page 66.

Noise Noise per sample

Number of averages

----------------------------------------------------

×=

Noise Noise per sample

Number of averages

----------------------------------------------------

Gate length 0.68µs()⁄

-----------------------------------------------------

⎝⎠

⎛⎞

×=

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.

1 2 ... 68 69 70 71 72 73 74 75 76 77 78 ... 98 99

Sin comentarios

Agilent Technologies U2000 Series Manual de servicio Pagina 73