12 SYSTem Subsystem
548 N1911A/1912A P-Series Power Meters Programming Guide
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 curve
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- 26):
Tab le 12-39 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 E9321A/25A: DEF
E9322A/26A: DEF
E9323A/27A: OFF
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.
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