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
1
Zero Set (Internal) Zero Set (External) Zero Drift
2
Measurement
Noise
3
Noise Per
Sample
4
–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
1
Number of averages
----------------------------------------------------
×=
Noise Noise per sample
1
Number of averages
----------------------------------------------------
×
4
Gate length 0.68µs()⁄
-----------------------------------------------------
⎝⎠
⎛⎞
4
×=
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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