The Spectrum Application (RF Measurements)
R&S
®
FPL1000
341
User Manual 1178.3370.02 ─ 03
Mode
Description
Mean
Mean value from the points of the displayed trace or a segment
thereof. The linear mean value of the equivalent voltages is calcula-
ted.
For example to measure the mean power during a GSM burst
Std Dev
The standard deviation of the measurement points from the mean
value.
The result is displayed in the marker results, indicated by "Power" and the selected
power mode, e.g. "RMS" . The measured values are updated after each sweep or
averaged over a user-defined number of sweeps (trace averaging).
The results can also be queried using the remote commands described in
ter 8.6.8, "Measuring the Time Domain Power"
7.2.8.3
Time Domain Power Basics - Range Definition Using Limit Lines
The range of the measured signal to be evaluated for the power measurement can be
restricted using limit lines. The left and right limit lines (S1, S2) define the evaluation
range and are indicated by vertical red lines in the diagram. If activated, the power
results are only calculated from the levels within the limit lines.
For example, if both the on and off phase of a burst signal are displayed, the measure-
ment range can be limited to the transmission or to the muting phase. 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 then varying the measurement range.
In order to get stable measurement results for a limited evaluation range, usually a trig-
ger is required.
Measurements and Results
