R&S ESR Series, User Manual

Page: 357 / 1126

Spectrum Measurements
R&S
®
ESR
354 User Manual 1175.7068.02 ─ 12
Range Lin. Unit ← Range
Selects linear scaling in dB for the level display range, i.e. the horizontal lines are
labeled in dB.
Markers are displayed in the selected unit ("Unit" softkey). Delta markers are displayed
in dB referenced to the power value at the position of marker 1.
Remote command:
DISP:TRAC:Y:SPAC LDB
, see
DISPlay[:WINDow<n>]:TRACe<t>:Y:SPACing
on page 668
Unit
Opens the "Unit" submenu to select the unit for the level axis.
The default setting in spectrum mode is dBm.
If a transducer is switched on, the softkey is not available.
In general, the signal analyzer measures the signal voltage at the RF input. The level
display is calibrated in RMS values of an unmodulated sine wave signal. In the default
state, the level is displayed at a power of 1 mW (= dBm). Via the known input impe-
dance (50 Ω or 75 Ω), conversion to other units is possible. The following units are
available and directly convertible:
●
dBm
●
dBmV
●
dBμV
●
dBμA
●
dBpW
●
Volt
●
Ampere
●
Watt
Remote command:
CALCulate<n>:UNIT:POWer
on page 844
Preamp On/Off
Switches the preamplifier on and off.
Remote command:
INPut:GAIN:STATe
on page 669
RF Atten Auto
Sets the RF attenuation automatically as a function of the selected reference level.
This ensures that the optimum RF attenuation is always used. It is the default setting.
When measuring spurious emissions, using this softkey automatically opens the
"Sweep List" dialog, see
"Sweep List dialog box" on page 289.
Remote command:
INPut:ATTenuation:AUTO
on page 846
Ref Level Offset
Opens an edit dialog box to enter the arithmetic level offset. This offset is added to the
measured level irrespective of the selected unit. The scaling of the y-axis is changed
accordingly. The setting range is ±200 dB in 0.1 dB steps.
Configuration