R&S FSW Series, Руководство пользователя

Страница: 173 / 1450

Measurements and Results
R&S
®
FSW
173 User Manual 1173.9411.02 ─ 43
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 837
Setting a fixed reference for Channel Power measurements (Set CP Reference)
If only one Tx channel and no adjacent channels are defined, the currently measured
channel power can be used as a fixed reference value for subsequent channel power
measurements.
When you select this button, the channel power currently measured on the Tx channel
is stored as a fixed reference power. In the following channel power measurements,
the power is indicated relative to the fixed reference power. The reference value is dis-
played in the "Reference" field (in relative ACLR mode); the default value is 0 dBm.
Note: In adjacent-channel power measurement, the power is always referenced to a
transmission channel (see "Reference Channel" on page 171), thus, this function is not
available.
Remote command:
[SENSe:]POWer:ACHannel:REFerence:AUTO ONCE
on page 850
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 160
●
"Resolution Bandwidth (RBW)" on page 160
●
"Video Bandwidth (VBW)" on page 161
●
"Detector" on page 161
●
"Trace Averaging" on page 162
Note: The reference level is not affected by this function. To adjust the reference level
automatically, use the Setting the Reference Level Automatically (Auto Level) function
in the [Auto Set] menu.
Remote command:
[SENSe:]POWer:ACHannel:PRESet
on page 840
Sweep Time
With the RMS detector, a longer "Sweep Time" increases the stability of the measure-
ment results. For recommendations on setting this parameter, see
"Sweep Time"
on page 159.
The "Sweep Time" can be set via the softkey in the "Ch Power" menu and is identical
to the general setting in the "Sweep" configuration dialog box.
Channel Power and Adjacent-Channel Power (ACLR) Measurement