R&S ESR Series, User Manual

Page: 249 / 1126

Spectrum Measurements
R&S
®
ESR
246 User Manual 1175.7068.02 ─ 12
"ON" A reference measurement of the instrument's inherent noise is carried
out. The noise power measured is then subtracted from the power in
the channel that is being examined.
The inherent noise of the instrument depends on the selected center
frequency, resolution bandwidth and level setting. Therefore, the cor-
rection function is disabled whenever one of these parameters is
changed. A disable message is displayed on the screen. Noise cor-
rection must be switched on again manually after the change.
"OFF" No noise correction is performed.
"AUTO" Noise correction is performed. After a parameter change, noise cor-
rection is restarted automatically and a new correction measurement
is performed.
Remote command:
[SENSe:]POWer:NCORrection
on page 747
Adjust Ref Lvl ← Ch Power ACLR
Adjusts the reference level to the measured channel power. This ensures that the set-
tings of the RF attenuation and the reference level are optimally adjusted to the signal
level without overloading the R&S
ESR or limiting the dynamic range by a too small
S/N ratio.
For details on manual settings see "Optimized Settings for CP/ACLR Test Parameters"
on page 247.
The reference level is not influenced by the selection of a standard. To achieve an opti-
mum dynamic range, the reference level has to be set in a way that places the signal
maximum close to the reference level without forcing an overload message. 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 still sig-
nificantly below the reference level.
Remote command:
[SENSe:]POWer:ACHannel:PRESet:RLEVel
on page 726
Predefined CP/ACLR Standards
When using predefined standards for ACLR measurement, the test parameters for the
channel and adjacent-channel measurements are configured automatically. The availa-
ble standards are listed below.
Predefined standards are selected using the "CP/ACLR Standard" softkey or the
CALC:MARK:FUNC:POW:PRES
command.
Standard GUI-Parameter SCPI-Parameter
EUTRA/LTE Square EUTRA/LTE Square EUTRa
EUTRA/LTE Square/RRC EUTRA/LTE Square/RRC REUTRa
W-CDMA 3.84 MHz forward W-CDMA 3GPP FWD FW3G
W-CDMA 3.84 MHz reverse W-CDMA 3GPP REV RW3G
Measurements