SYSTem Subsystem 12
Keysight N8262A Programming Guide 495
W-CDMA
The W-CDMA set-up provides:
– Average power in a W-CDMA signal (bandwidth <=5 MHz)
– Peak power and peak-to-average ratio of the signal over a defined, statistically
valid number of samples. The reading is continuously refreshed. This indicates
how W-CDMA channel loading affects peak power and power distribution.
The measurement is a continuously gated measurement on a 3GPP W-CDMA
signal. Its aim is to measure the peak and average power corresponding to a
<0.01 % probability that there are no peaks above the returned peak reading. Time
gating is set to 10 ms, corresponding to 200000 samples. Triggering is set to
occur continuously internally to the meter. The internal trigger is set to AutoLevel.
A reading over the 10 ms period is returned then re-initiated for the next 10 ms
period. In this way the reading always relates to a position beyond 0.01 % on the
CCDF and will refresh to track any signal or DUT changes.
The following table shows the power meter presets when <character_data> is
set to WCDMA. Commands not listed are preset according to their DEFault values
(for further information refer to Table 12-1)
Table 12-14 W-CDMA: Power meter presets
Command Setting Comments
Frequency
[SENS[1]]|SENS2:FREQ[:CW|:FIX] +1900.000 MHz Frequency setting
Sensor measurement mode
[SENS[1]]|SENS2:DET:FUNC NORM Measurement mode
Sensor video bandwidth setup
[SENS[1]]|SENS2:BAND|BWID:VID N1921/2A: OFF Sensor video bandwidth
Gate Setup
[SENS[1]]|SENS2:SWE[1]|2|3|4:OFF:TIME Gate 1: 0 s
Gates 2 - 4: 0
Delay between trigger point and time
gated period.
[SENS[1]]|SENS2:SWE[1]|2|3|4:TIME Gate 1: 10 ms
Gates 2 - 4: 0
Length of time gated period for time gated
measurements.
Trigger setup
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