R&S
®
CMW 500 System Overview
Measurements
Operating Manual 1202.3986.32 – 03 40
With an inappropriate setting of the expected nominal power, the measurement results
generally deteriorate:
If the "Expected Nominal Power" setting is too low, the RF input connector is
overdriven. This can cause unwanted responses in the input path.
If the "Expected Nominal Power" setting is too high, the RF input connector is
underdriven, which also impairs the accuracy of the measurements.
Analyzer Frequency
Sets the center frequency of the RF analyzer. This value must be in accordance with
the measured RF signal in order to obtain meaningful measurement results.
3.2.3 Statistical Settings
Measurements generally cover a basic time interval and can be repeated periodically.
The measurement interval depends on the measurement context.
The number of measurement intervals that the R&S CMW 500 repeats in order to
calculate statistical results is termed "statistic count" or "statistic length" (multi-
measurement count). After one statistic count, the instrument has terminated a basic
measurement cycle ("single shot" measurement). Measurement cycles can be
repeated for an unlimited number of times, resulting in the "continuous" repetition
mode.
Most measurement contexts provide different sets of measurement results; they are
calculated as described in section Statistical Results.
The statistical settings described below are set in the configuration dialogs assigned to
each measurement.
Statistic Count / Measurement Cycle
The statistic count (also termed statistic length) is the integer number of measurement
intervals per measurement cycle (statistics cycle, single shot measurement). The
length of a measurement interval is measurement-specific.
The measurement interval for the GPRF Power measurement is a configurable
time interval termed the Measurement Length/Step Length. This corresponds to
either a single power step (if no sequence mode is active) or a step sequence.
The measurement interval for the GPRF External Power Sensor measurement is
the time to request and obtain a single power result from the power sensor.
The measurement interval in most network test applications is related to a
network-specific periodic time interval, e.g. a timeslot or burst.
Depending on the repetition mode (see below), a measurement may extend over one
or several measurement cycles.
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