GW Instek GSP-827 User Manual - Manual (Page 62)

2.7GHz Spectrum Analyzer Operation Manual
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61
8.2.4 Pwr Measurement
Power measurement functions provide the ACPR (Adjacent Channel Power Ratio),
OCBW (OCcupied BandWidth). For ACPR measurement, the CH BW (channel
bandwidth), Adj CH SPC (adjacent channel bandwidth) and Adj CH Offs (adjacent
channel offset) have to be specified first. The ACPR measurement turns out the power
ratio of main channel and upper/lower adjacent channels in dB. The terminology ACLR
(Adjacent Channel Leakage Ratio) is sometimes used instead.
Adj CH BW and Adj CH Offs are defined in ADJ CH OFFSET functions. Two types
of ACPR with different channel BW and offset can be measured simultaneously. They are
noted as Adj CH 1 (LACPR 1/ UACPR1) and Adj CH 2 (LACPR 2/ UACPR 2) in the
P0wer measurement table.
Definitions for ACPR measurement
F1
F2
F3
F4
F5
F6
Center
Start
stop
Step
ACPR
ON/OFF
CH BW
OCBW
ON/OFF
Setup
0
1 2 3
7
6 5 4
8 9
. -
Pwr Measure Center
Start
stop
Step
CH BW
OCBW%
CH SPC
ADJ CH
Offset
CH
UP
CH
DN
Center
Start
stop
Step
ADJ CH
BW 1
ADJ CH
Offs 1
ADJ CH
BW 2
ADJ CH
Offs 1
Return
Return
CH
BW
Adj. CH
Offset
UAdj. CH
BW
LAdj. CH
BW
CH SPC
Channel Up Channel Down