Measurements and Results
R&S
®
FSVA3000/ R&S
®
FSV3000
171User Manual 1178.8520.02 ─ 01
"Abs"
The absolute power in the adjacent channels is displayed in the unit
of the y-axis, e.g. in dBm, dBµV.
"Rel"
The level of the adjacent channels is displayed relative to the level of
the transmission channel in dBc.
Remote command:
[SENSe:]POWer:ACHannel:MODE on page 784
Channel power level and density ( Power Unit )
By default, the channel power is displayed in absolute values. If "/Hz" is activated, the
channel power density is displayed instead. Thus, the absolute unit of the channel
power is switched from dBm to dBm/Hz.
Note: The channel power density in dBm/Hz corresponds to the power inside a band-
width of 1 Hz and is calculated as follows:
"channel power density = channel power – log
10
(channel bandwidth)"
Thus you can measure the signal/noise power density, for example, or use the addi-
tional functions Absolute and Relative Values (ACLR Mode) and Reference Channel to
obtain the signal to noise ratio.
Remote command:
CALCulate<n>:MARKer<m>:FUNCtion:POWer<sb>:RESult:PHZ on page 783
Power Mode
The measured power values can be displayed directly for each trace ( "Clear/ Write" ),
or only the maximum values over a series of measurements can be displayed ( "Max
Hold" ). In the latter case, the power values are calculated from the current trace and
compared with the previous power value using a maximum algorithm. The higher value
is retained. If "Max Hold" mode is activated, "Pwr Max" is indicated in the table header.
Note that the trace mode remains unaffected by this setting.
Remote command:
CALCulate<n>:MARKer<m>:FUNCtion:POWer<sb>:MODE on page 748
Optimized Settings ( Adjust Settings )
All instrument settings for the selected channel setup (channel bandwidth, channel
spacing) can be optimized automatically.
The adjustment is carried out only once. If necessary, the instrument settings can be
changed later.
The following settings are optimized by "Adjust Settings" :
●
"Frequency Span" on page 151
●
"Resolution Bandwidth (RBW)" on page 151
●
"Video Bandwidth (VBW)" on page 152
●
"Detector" on page 152
●
"Trace Averaging" on page 153
Remote command:
[SENSe:]POWer:ACHannel:PRESet on page 751
Symmetrical Adjacent Setup
If enabled, the upper and lower adjacent and alternate channels are defined symmetri-
cally. This is the default behavior.
Channel Power and Adjacent-Channel Power (ACLR) Measurement
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