Ronde & Schwarz 1304.0004.03, User Manual

Page: 312 / 1076

The Spectrum Application (RF Measurements)
R&S
®
FPL1000
312 User Manual 1178.3370.02 ─ 09
Define an offset if the signal is attenuated or amplified before it is fed into the
R&S
FPL1000 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
FPL1000 must handle. Do not rely on the dis-
played reference level (internal reference level = displayed reference level - offset).
For details, see "Reference level offset" on page 309.
Remote command:
DISPlay[:WINDow<n>]:TRACe<t>:Y[:SCALe]:RLEVel:OFFSet
on page 777
Unit ← Reference Level
The R&S FPL1000 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 "Impedance" on page 276), conversion to
other units is possible.
The following units are available and directly convertible:
●
dBm
●
dBmV
●
dBμV
●
dBm/MHz (power density)
●
dBμA
●
dBpW
●
Volt
●
Ampere
●
Watt
Additional units available only for installed R&S FPL1-K54 (EMI measurements) option:
●
dBmV/MHz (normalized to 1 MHz)
●
dBµV/MHz (normalized to 1 MHz)
●
dBµV/mMHz (normalized to 1 MHz)
(only available for active transducers with dBµV/m values)
●
dBµA/MHz (normalized to 1 MHz)
●
dBµA/mMHz (normalized to 1 MHz)
(only available for active transducers with dBµA/m values)
●
dBpW/MHz (normalized to 1 MHz)
Remote command:
INPut<ip>:IMPedance
on page 790
CALCulate<n>:UNIT:POWer
on page 776
Setting the Reference Level Automatically (Auto Level) ← Reference Level
Automatically determines a reference level which ensures that no overload occurs at
the R&S
FPL1000 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
clipping are minimized.
To determine the required reference level, a level measurement is performed on the
R&S
FPL1000.
Amplitude and Vertical Axis Configuration