12 SYSTem Subsystem
536 N1911A/1912A P-Series Power Meters Programming Guide
EDGE
EDGE (Enhanced Data for Global Evolution or Enhanced Data for GSM
Evolution) is an enhancement of the GSM standard. Whereas the GSM
modulation scheme is GMSK which has constant amplitude, the EDGE
modulation scheme is 8PSK which has variable amplitude.
The EDGE set- up provides:
• Average power measurement in an EDGE burst.
• Peak- to- average ratio in an EDGE burst.
• A trace display of the burst profile
An EDGE measurement is started by detecting the rising edge of the
EDGE 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.
Trigger level hysteresis is used to prevent the power meter re- triggering
on the varying power levels within the EDGE burst. Time- gating is used to
measure the average power and the peak- to- average ratio in the useful
part of the RF burst.
The following table shows the power meter presets when <character_data>
is set to EDGE. Commands not listed are preset according to their DEFault
values (for further information refer to Table 12- 26).
Tab le 12-30EDGE: 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.
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