Rohde & Schwarz FSV3000, User Manual

Page: 457 / 1489

Common measurement settings
R&S
®
FSVA3000/ R&S
®
FSV3000
457 User Manual 1178.8520.02 ─ 08
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 FSV/A 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).
For details, see Chapter 6.4.1.1, "Reference level" , on page 453.
Note: Note that for input from the External Mixer (R&S FSV/A-B21) the maximum ref-
erence level also depends on the conversion loss, see "Reference level" on page 401.
For an active external frontend, the reference level refers to the RF input at the exter-
nal frontend, not the levels at the RF input of the R&S
FSV/A.
See "External Frontend Connection State" on page 430.
Remote command:
DISPlay[:WINDow<n>][:SUBWindow<w>]:TRACe<t>:Y[:SCALe]:RLEVel
on page 1116
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
FSV/A 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
FSV/A 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 454.
Remote command:
DISPlay[:WINDow<n>][:SUBWindow<w>]:TRACe<t>:Y[:SCALe]:RLEVel:
OFFSet
on page 1117
Unit ← Reference Level
The R&S FSV/A 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 358), 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
Amplitude and vertical axis configuration