Measurements and results
R&S
®
FSVA3000/ R&S
®
FSV3000
177
User Manual 1178.8520.02 ─ 08
The inherent noise of the instrument depends on the selected center frequency, resolu-
tion bandwidth and level setting. Therefore, the correction function is disabled when-
ever one of these parameters is changed. A disable message is displayed on the
screen. To enable the correction function after changing one of these settings, activate
it again. A new reference measurement is carried out.
Noise cancellation is also available in zero span.
For an active external frontend, noise cancellation is not available. See
●
RMS
●
Average
●
Sample
●
Positive peak
Remote command:
Fast ACLR
If activated, instead of using the IBW method, the R&S
FSV/A sets the center fre-
quency to the different channel center frequencies consecutively and measures the
power with the selected measurement time (= sweep time/number of channels).
Remote command:
Selected Trace
The CP/ACLR measurement can be performed on any active trace.
Remote command:
Absolute and Relative Values (ACLR Mode)
The powers of the adjacent channels are output in dBm or dBm/Hz (absolute values),
or in dBc, relative to the specified reference Tx channel.
"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:
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)"
Channel power and adjacent-channel power (ACLR) measurement
