Rohde & Schwarz ZNL Series, Руководство пользователя

Страница: 43 / 240

Configuration
R&S
®
ZNL
43 User Manual 1178.5989.02 ─ 06
Define an offset if the signal is attenuated or amplified before it is fed into the R&S ZNL
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
ZNL must handle. Do not rely on the dis-
played reference level (internal reference level = displayed reference level - offset).
Remote command:
DISPlay[:WINDow<n>]:TRACe<t>:Y[:SCALe]:RLEVel:OFFSet
on page 122
Unit ← Reference Level
The R&S ZNL measures the signal voltage at the RF input.
The following units are available and directly convertible:
●
dBm
●
dBmV
●
dBμV
●
dBμA
●
dBpW
●
Volt
●
Ampere
●
Watt
Remote command:
INPut<ip>:IMPedance
on page 110
CALCulate<n>:UNIT:POWer
on page 121
Setting the Reference Level Automatically ( Auto Level ) ← Reference Level
Automatically determines a reference level which ensures that no overload occurs at
the R&S
ZNL for the current input data. At the same time, the internal attenuators are
adjusted so the signal-to-noise ratio is optimized, while signal compression and clip-
ping are minimized.
To determine the required reference level, a level measurement is performed on the
R&S
ZNL.
If necessary, you can optimize the reference level further. Decrease the attenuation
level manually to the lowest possible value before an overload occurs, then decrease
the reference level in the same way.
You can change the measurement time for the level measurement if necessary (see "
Changing the Automatic Measurement Time ( MeastimeManual )" on page 59).
Remote command:
[SENSe:]ADJust:LEVel
on page 142
Attenuation Mode / Value
The RF attenuation can be set automatically as a function of the selected reference
level (Auto mode). This ensures that no overload occurs at the RF Input connector for
the current reference level. It is the default setting.
Amplitude