12 SYSTem Subsystem
542 N1911A/1912A P-Series Power Meters Programming Guide
CDMAone
The cdmaOne set-up provides:
– Average power in an IS-95 cdmaOne signal (bandwidth is less than 1.5 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 gives an
indication of how cdmaOne channel loading affects peak power and power
distribution.
The measurement is a continuously gated measurement on a cdmaOne 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 therefore 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 10ms period is returned and the reading is then re-initiated for
the next 10ms 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 CDMAone. Commands not listed are preset according to their DEFault values
(for further information refer to Table 12-1):
Table 12-8 CDMAone: Power Meter Presets
Command Setting Comments
Frequency
[SENS[1]]|SENS2:FREQ[:CW|:FIX] +850.000 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: OFF
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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