MEAS - Analyzer R&S ESCI
1166.6004.12 4.168 E-1
ADJUST
REF LVL
The ADJUST REF LVL softkey adjusts the reference level of the R&S ESCI to
the measured total power of the signal. The softkey is activated after the first
sweep with the measurement of the occupied bandwidth has been completed
and the total power of the signal is thus known.
Adjusting the reference level ensures that the signal path of the R&S ESCI will
not be overloaded and the dynamic range not limited by too low a reference
level.
Since the measurement bandwidth for channel power measurements is
significantly lower than the signal bandwidth, the signal path may be overloaded
although the trace is distinctly below the reference level. If the measured
channel power is equal to the reference level, the signal path cannot be
overloaded.
IEC/IEEE-bus command:
SENS:POW:ACH:PRES:RLEV
ADJUST
SETTINGS
The ADJUST SETTINGS softkey optimizes the instrument settings for the
measurement of the occupied bandwidth according to the specified channel
bandwidth.
All instrument settings relevant for power measurement within a specific
frequency range, such as
• frequency span 3 x channel bandwidth
• resolution bandwidth RBW ≤ 1/40 of channel bandwidth
• video bandwidth VBW ≥ 3 × RBW
• detector RMS
are optimized.
The reference level is not influenced by
ADJUST SETTINGS. For an optimum
dynamic range it should be selected in a way that the signal maximum is close
to the reference level.
The adjustment is carried out only once; if necessary, the instrument settings
may be changed later.
IEC/IEEE-bus command:
SENS:POW:PRES OBW
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