R&S FSQ Signal Analyzer - Rohde & Schwarz

R&S FSQ Instrument Functions
TIME DOM
POWER
Analyzer Mode
• Channel power and adjacent-channel power in the frequency domain with a single
carrier (“CHAN PWR ACP MULT CARR ACP” on page 4.88)
• Occupied bandwidth (“OCCUPIED BANDWIDTH” on page 4.106)
• Carrier-to-noise ratio (“C/N / C/NO” on page 4.118)
• Amplitude probability distribution (“SIGNAL STATISTIC” on page 4.111)
• Modulation depth (“MODULATION DEPTH” on page 4.119)
• Spurious emissions (“SPURIOUS EMISSIONS” on page 4.127)
• Spectrum Emission Mask (“SPECTRUM EMISSION MASK” on page 4.146)
• 3rd order intercept (“TOI” on page 4.123)
• Harmonic distortion (“HARMONIC DISTOR” on page 4.124)
The above measurements are carried out alternatively.
4.5.13.1 Power Measurement in Time Domain
With the aid of the power measurement function, the R&S FSQ determines the
power of the signal in the time domain (SPAN = 0 Hz) by summing up the power at
the individual pixels and dividing the result by the number of pixels. In this way it is
possible to measure for example the power of TDMA signals during transmission or
during the muting phase. Both the mean power and the rms power can be measured
by means of the individual power values.
The result is displayed in the marker info field.
The measured values are updated after each sweep or averaged over a userdefined
number of sweeps (AVERAGE ON/OFF and NUMBER OF SWEEPS) in
order to determine e.g. the mean power over several bursts. For determination of
the peak value (MAX HOLD ON) the maximum value from several sweeps is displayed.
Example
Marker info field for: MEAN selected, AVERAGE ON and MAX HOLD ON:
MEAN HOLD -2.33 dBm
MEAN AV -2.39 dBm
If both the on and off phase of a burst signal are displayed, the measurement range
can be limited to the transmission or to the muting phase with the aid of vertical
lines. The ratio between signal and noise power of a TDMA signal for instance can
be measured by using a measurement as a reference value and after that varying
the measurement range.
Upon switching on power measurement the sample detector is activated (TRACE -
DETECTOR - SAMPLE).
POWER (ON OFF)
PEAK
RMS
MEAN
STANDARD DEVIATION
4.80 Operating Manual 1313.9681.12 - 01