R&S FSMR, Operating Manual

Page: 298 / 955

MEAS - Analyzer R&S FSMR
1166.3363.12 4.16-18 E-2
The ACP REF SETTINGS softkey opens a table for selecting
the transmission channel to which the adjacent-channel relative
power values should be referenced.
TX CHANNEL 1 - 4
Selection of one of channels 1 to 4.
MIN POWER
TX CHANNEL The transmission channel with the
lowest power is used as a reference
channel.
MAX POWER
TX CHANNEL The transmission channel with the
highest power is used as a reference
channel.
ACP REF
SETTINGS
LOWEST & HIGHEST
CHANNEL The outer lefthand transmission
channel is the reference channel for
the lower adjacent channels, the outer
righthand transmission channel that
for the upper adjacent channels.
The softkey is only available for the multicarrier ACP measurement.
IEC/IEEE-bus command:
SENS:POW:ACH:REF:TXCH:MAN 1
SENS:POW:ACH:REF:TXCH:AUTO MIN
CP/ACP
ABS REL
The CP/ACP ABS/REL softkey (channel power absolute/ relative)
switches between absolute and relative power measurement in the
channel.
CP/ACP ABS The absolute power in the transmission channel
and in the adjacent channels is displayed in the
unit of the Y axis, e.g. in dBm, dB
µ
V.
CP/ACP REL For adjacent-channel power measurements ( NO.
OF ADJ CHAN > 0), the level of the adjacent
channels is displayed relative to the level of the
transmission channel in dBc.
For channel power measurements ( NO. OF ADJ
CHAN = 0) with a single carrier, the power of the
transmission channel is displayed relative to the
power of a reference channel defined by
SET CP
REFERENCE . This means:
1. Declare the power of the currently measured
channel as the reference value, using the
SET CP REFERENCE softkey.
2. Select the channel of interest by varying the
channel frequency (R&S FSMR center
frequency).
With linear scaling of the Y axis, the power of the
new channel relative to the reference channel
(CP/CP
ref
) is displayed. With dB scaling, the
logarithmic ratio 10lg (CP/CP
ref
) is displayed.
The relative channel power measurement can thus
also be used for universal adjacent-channel power
measurements. Each channel can be measured
individually.
IEC/IEEE-bus command:
SENS:POW:ACH:MODE ABS