RF Measurements > Common Controls for Settling Time
Displays
De
fi
ne Tab for Settling Time Displays
Meas BW
This control limits the bandwidth of the Settling Time measurement. You use the measurement bandwidth
setting to improve the signal-to-noise ratio of the measurement, resulting in lower measurement uncertainty.
However, if the measurement bandwidth is set too low, resulting in fewer samples per second, it can reduce
the number of points within the measurement length below the 256 stable samples required, thus causing
the analysis to fail. The measurement bandwidth is 100 Hz to 110 MHz (Option 110) or 100 Hz to 40 MHz
(Standard) . To see the effect of measurement bandwidth on measurement uncertainty, see the
RSA6100A
Series Speci
fi
cations and Performance Veri
fi
cation Reference
, Tektronix part number 077-0251-XX. This
manual is supplied on the Documents CD or can be downloaded from www.tek.com/manuals.
Target Reference
The target reference is a calculated or user-speci
fi
ed value of
fi
nal settled frequency within the
measurement period. When set to
Auto
, the instrument determines this value by averaging at least the last
256 samples at the end of the measurement period. When set to
Meas freq
, the Target Reference is set to
the Measurement Frequency of the instrument. You can enter a manual offset from the target frequency to
fi
ne-tune the Target Reference when
Meas freq
is selected.
Tol/-)
The Tolerance is the frequency or phase range within which the signal must remain to be considered
settled. This is set as a ± value by the user. In the frequency settling time measurement, the tolerance
band is centered about the target value. In the phase settling time measurement, the tolerance band is
centered about the settled phase value.
The target frequency depends on the Target reference value setting:
If Target Reference is set to
AUTO
, then the target value is the settled value (the frequency at which
the signal is considered settled).
If Target Reference is set to MeasFreq, then the Target value =
Meas Frequency
+
Offset
.
Offset
Offset is used for
fi
ne-tuning the Target Reference when
Meas freq
is selected. The value for Offset is
entered manually.
RSA6100A Series Real-Time Spectrum Analyzers Help
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