R&S FSMR
Analyzer - MEAS
1166.3363.12
4.16-11
E-2
CP/ACP
CONFIG
See following section "Setting the Channel Configuration"
SET CP
REFERENCE
With channel power measurement activated, the
SET CP REFERENCE
softkey
defines the currently measured channel power as the reference value. The
reference value is displayed in the
CH PWR REF
field; the default value is 0 dBm.
In adjacent-channel power measurement with one or several carrier signals, the
power is always referenced to a transmission channel, i.e. no value is displayed
for
CH PWR REF
.
IEC/IEEE-bus command:
SENS:POW:ACH:REF:AUTO ONCE
SWEEP
TIME
The
SWEEP TIME
softkey activates the entry of the sweep time. With the RMS
detector, a longer sweep time increases the stability of the measurement
results.
The function of the softkey is identical to the softkey
SWEEP TIME MANUAL
in
the menu
BW
.
IEC/IEEE-bus command:
SENS:SWE:TIM <value>
NOISE CORR
ON OFF
If the
NOISE CORR ON/OFF
softkey is activated, the results will be corrected by
the instrument's inherent noise, which increases the dynamic range.
When the function is switched 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 correction function is
disabled whenever one of these parameters is changed. A disable message is
displayed on the screen.
To enable the correction function in conjunction with the changed setting, press
the softkey once more. A new reference measurement is carried out.
IEC/IEEE-bus command:
SENS:POW:NCOR ON
FAST ACP
ON OFF
The
FAST ACP
softkey switches between the IBW method (
FAST ACP OFF
) and
the time domain method (
FAST ACP ON
).
With
FAST ACP ON
the power measurement is performed in the different channels
in the time domain. The R&S FSMR sets the center frequency consecutively to the
different channel center frequencies and measures the power with the selected
measurement time (= sweep time/number of channels). The RBW filters suitable
for the selected standard and frequency offset are automatically used (e.g. root
raised cos with IS 136). The list of available channel filters is included in section
"Setting of Bandwidths and Sweep Time –
BW key"
.
The RMS detector is used for obtaining correct power measurement results.
Therefore this requires no software correction factors.
Measured values are output as a list. The powers of the transmission channels
are output in dBm, the powers of the adjacent channels in dBm
(CP/ACP ABS)
or dB
(CP/ACP REL)
.
The sweep time is selected depending on the desired reproducibility of results.
Reproducibility increases with sweep time since power measurement is then
performed over a longer time period.
As a general approach, it can be assumed that approx. 500 non-correlated
measured values are required for a reproducibility of 0.5 dB (99 % of the
measurements are within 0.5 dB of the true measured value). This holds true
for white noise. The measured values are considered as non-correlated when
their time interval corresponds to the reciprocal of the measured bandwidth.
Summary of Contents for FSMR
Page 1: ...R S FSMR Measuring Receiver Operating Manual Test Measurement Operating Manual 1313 9723 12 01...
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Page 26: ...Contents Preparing for Operation R S FSMR 1155 5047 12 I 1 2 E 2 Fig 1 1 Front View...
Page 28: ...Front View R S FSMR 1166 3363 12 1 2 E 2 Fig 1 1 Front View...
Page 30: ...Front View R S FSMR 1166 3363 12 1 4 E 2 Fig 1 1 Front View...
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Page 130: ...Menu Overview R S FSMR 1166 3363 12 3 42 E 3 Menu Overview another Keys MKR Key...
Page 141: ...R S FSMR Menu Overview 1166 3363 12 3 53 E 3 LOCAL Menu LOCAL...
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Page 376: ...Configuration Setup R S FSMR 1166 3363 12 4 19 28 E 2...
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Page 937: ...Contents Error Messages R S FSMR 1166 3363 12 I 9 2 E 1...