12 SYSTem Subsystem
534 N1911A/1912A P-Series Power Meters Programming Guide
GSM900
Table 12-2 shows the power meter presets when <character_data> is set to
GSM900.
The GSM900 set-up provides the following:
– Average power measurement in one GSM timeslot
– Trace display showing “on” timeslot
A GSM900 measurement is started by detecting the rising edge of a GSM RF
burst—for example the burst emitted by a GSM mobile—using the internal RF level
trigger. The trigger level is set to –20 dBm. Time-gating is used to measure the
average power in the useful part of a GSM burst.
Commands not listed are preset according to their DEFault values (for further
information refer to Table 12-1.
Table 12-2 GSM900: Power Meter Presets
Command Setting Comments
Frequency
[SENS[1]]|SENS2:FREQ[:CW|:FIX] +900.000 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: HIGH
E9322A/26A: MED
E9323A/27A: LOW
N1921/2A: LOW
Sensor video bandwidth
Gate Setup
[SENS[1]]|SENS2:SWE[1]|2|3|4
:OFF:TIME
Gate 1: 20 µs
Gates 2 - 4: 0
Delay between trigger point and time
gated period.
[SENS[1]]|SENS2:SWE[1]|2|3|4
:TIME
Gate 1: 520 µs
Gates 2 - 4: 0
Length of time gated period for time gated
measurements.
Trigger setup
TRIG[:SEQ[1]|2]:SOUR INT1 Trigger source set up and acquisition
mode continuous triggering
INIT:CONT ON
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