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290 Chapter 5
Language Reference
SENSe Subsystem
History: Added revision A.05.00 or later
Adjacent Channel Power—Fast Mode ADC Range
[:SENSe]:ACP:FAST:OFFSet:ADC:RANGe
AUTO|APEak|APLock|M6|P0|P6|P12|P18|P24
[:SENSe]:ACP:FAST:OFFSet:ADC:RANGe?
Select the range for the gain-ranging that is done in front of the ADC
when the [:SENSe]:ACP:SWEep:TYPE is set to Fast. This is an advanced
control that normally does not need to be changed. If you are measuring
a CW signal, see the description below.
• Auto - sets the ADC range automatically. For most FFT
measurements, the auto feature should not be selected. An exception
is when measuring a signal which is “bursty,” in which case the auto
featurecan maximize the time domain dynamic range, if FFT results
are less important to you than time domain results.
• Auto Peak (APEak) - sets the ADC range automatically to the peak
signal level. The auto peak feature is a compromise that works well
for both CW and burst signals.
• Auto Peak Lock (APLock) - holds the ADC range automatically at
the peak signal level. The auto peak lock feature is more stable than
the auto peak featurefor CW signals, but should not be used for
“bursty” signals.
• M6 - sets an ADC range that subtracts 6 dB of fixed gain across the
range manually. Manual ranging is best for CW signals.
• P0, P6, P12, P18, or P24 - selects ADC ranges that add 0, 6, 12, 18, or
24 dB of fixed gain across the range manually. Manual ranging is
best for CW signals.
Factory Preset
and *RST: Auto Peak (APEak)
Remarks: You must be in the W-CDMA (3GPP) mode to use this
command. Use INSTrument:SELect to set the mode.
Adjacent Channel Power—Fast Mode Relative Attenuation
[:SENSe]:ACP:FAST:OFFSet:RATTenuation <float>
[:SENSe]:ACP:FAST:OFFSet:RATTenuation?
Sets a relative amount of attenuation for the measurements at the
offset channels when the [:SENSe]:ACP:SWEep:TYPE is set to Fast.
This attenuation is always specified relative to the attenuation that is
required to measure the carrier channel. Since the offset channel power
is lower than the carrier channel power, less attenuation is required to