Ronde & Schwarz 1304.0004K03, User Manual

Page: 314 / 1071

The Spectrum Application (RF Measurements)
R&S
®
FPL1000
314 User Manual 1178.3370.02 ─ 11
The reference level can also be used to scale power diagrams; the reference level is
then used for the calculation of the maximum on the y-axis.
Since the hardware of the R&S FPL1000 is adapted according to this value, it is rec-
ommended 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).
For details, see Chapter 6.5.1.1, "Reference Level" , on page 310.
Remote command:
DISPlay[:WINDow<n>]:TRACe<t>:Y[:SCALe]:RLEVel
on page 766
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
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 311.
Remote command:
DISPlay[:WINDow<n>]:TRACe<t>:Y[:SCALe]:RLEVel:OFFSet
on page 767
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 277), 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.
The "dBx/MHz" units are normalized to the pulse bandwidth and intended to be used
only for EMI and EMC measurements. They are not suitable to measure power densi-
ties in the spectrum application.
●
dBmV/MHz (normalized to 1 MHz)
●
dBµV/MHz (normalized to 1 MHz)
Amplitude and Vertical Axis Configuration