User Manual

The Spectrum Application (RF Measurements)

R&S

FPL1000

385User Manual 1178.3370.02 ─ 03

Reference Level .........................................................................................................385

└ Shifting the Display ( Offset )........................................................................ 385

└ Unit ...............................................................................................................386

└ Setting the Reference Level Automatically ( Auto Level ).............................386

Attenuation Mode / Value ...........................................................................................386

Impedance ................................................................................................................. 387

Preamplifier ................................................................................................................387

Reference Level

Defines the expected maximum reference level. Signal levels above this value may not

be measured correctly. This is indicated by an "IF Overload" status display.

The reference level can also be used to scale power diagrams; the reference level is

then used as the maximum on the y-axis.

Since the hardware of the R&S FPL is adapted according to this value, it is recommen-

ded 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 7.5.1.1, "Reference Level", on page 382.

Remote command:

DISPlay[:WINDow<n>]:TRACe<t>:Y[:SCALe]:RLEVel on page 658

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.

Amplitude and Vertical Axis Configuration