R&S FSW-K7 User Manual page 89

®
R&S FSW-K7
Since the hardware of the R&S FSW is adapted according to this value, it is recom-
mended that you set the reference level close above the expected maximum signal
level. Thus you ensure an optimum measurement (no compression, good signal-to-
noise ratio).
Note that for input from the External Mixer (R&S FSW-B21) the maximum reference
level also depends on the conversion loss; see the R&S FSW User Manual for details.
Remote command:
DISPlay[:WINDow<n>]:TRACe<t>:Y[:SCALe]:RLEVel
Shifting the Display (Offset) ← Reference Level
Defines an arithmetic level offset. This offset is added to the measured level. In some
result displays, the scaling of the y-axis is changed accordingly.
Define an offset if the signal is attenuated or amplified before it is fed into the
R&S FSW so the application shows correct power results. All displayed power level
results are shifted by this value.
The setting range is ±200 dB in 0.01 dB steps.
Note, however, that the internal reference level (used to adjust the hardware settings to
the expected signal) ignores any "Reference Level Offset". Thus, it is important to keep
in mind the actual power level the R&S FSW must handle. Do not rely on the displayed
reference level (internal reference level = displayed reference level - offset).
Remote command:
DISPlay[:WINDow<n>]:TRACe<t>:Y[:SCALe]:RLEVel:OFFSet
Unit ← Reference Level
The R&S FSW measures the signal voltage at the RF input.
In the default state, the level is displayed at a power level of 1 mW (= dBm). Via the
known input impedance (50 Ω or 75 Ω, see
other units is possible.
The following units are available and directly convertible:
●
dBm
●
dBmV
●
dBμV
●
dBμA
●
dBpW
●
Volt
●
Ampere
●
Watt
Remote command:
INPut:IMPedance
CALCulate<n>:UNIT:POWer
Setting the Reference Level Automatically (Auto Level) ← Reference Level
Automatically determines a reference level which ensures that no overload occurs at
the R&S FSW for the current input data. At the same time, the internal attenuators and
the preamplifier (for analog baseband input: the full scale level) are adjusted so the sig-
nal-to-noise ratio is optimized, while signal compression and clipping are minimized.
User Manual 1173.9240.02 ─ 23
on page 191
on page 244
Input and Frontend Settings
on page 244
"Impedance" on page 92), conversion to
Configuration
on page 245
89