12 SYSTem Subsystem
580 N1911A/1912A P-Series Power Meters Programming Guide
NADC
The NADC set-up provides:
– Average power measurement of both active timeslots in NADC or IS-136 “full
rate” transmission. This assumes that there are two timeslots to be measured
in each frame as for example with timeslots 0 in the following diagram:
Figure 12-2 A Trace Display Of The Active Timeslots
– A trace display of the active timeslots.
The measurement is started by detecting the RF burst—for example the burst
emitted by a mobile—using the internal RF level trigger. The internal level trigger
is set to –20 dBm. Time-gating is used to measure the average power in two
active timeslots which are separated by two inactive timeslots
The following table shows the power meter presets when <character_data> is set
to NADC. Commands not listed are preset according to their DEFault values (for
further information refer to Table 12-1):
Table 12-41 NADC: Power Meter Presets
0120
2
1
IS-136 full rate frame
Command Setting Comments
Frequency
[SENS[1]]|SENS2:FREQ[:CW|:FIX] +800.000 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: OFF
E9322A/26A: OFF
E9323A/27A: OFF
N1921/2A: OFF
Sensor video bandwidth
Gate Setup
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