System Overview
R&S
®
CMW500
78
User Manual 1173.9463.02 ─ 02
bed in section "Measurement Results" in the description of the "WiMAX measurement"
firmware application.
Compared to independent TX measurements, multi evaluation measurements provide
several advantages:
●
They ensure highest measurement speed.
●
They provide a comprehensive picture of the performance of a tested RF transmitter
with a minimum of effort for configuring the R&S CMW500.
●
They provide "linked" results: The different measured quantities are all based on the
same set of raw measurement data.
In remote control, it is possible to control each multi evaluation measurement as a whole
but retrieve the different types of results separately.
Controlling multi evaluation measurements
A multi evaluation measurement is controlled like any other measurement using the
measurement control softkey.
In some multi evaluation measurements, it is possible to disable part of the results; see
"Measurement speed considerations" below.
Measurement results and settings
Multi evaluation measurement results are displayed in a common measurement dialog
which may comprise several diagrams (views) and other output elements. In general, it
is possible to modify the display settings, e.g. in order to zoom in on a single diagram.
Measurement settings for the different views are also part of a common configuration
dialog. Many parameters (e.g. the connection control settings and statistical parameters)
affect the entire multi evaluation measurement.
Measurement speed considerations
A multi evaluation measurement ensures that the entire set of results is acquired and
processed as quickly as possible. If only part of the results is needed, it can be preferable
to restrict the scope of the measurement in order to gain additional speed.
Example:
Disabling the ACLR results in the GSM multi evaluation measurement speeds
up the measurement of the modulation accuracy.
4.3.8 RX Measurements
The purpose of an RX measurement is to assess the performance of an RF receiver. The
R&S CMW500 transmits a definite bit pattern on the downlink (forward) RF signal. The
device under test demodulates the received signals; the percentage of bits or data blocks
received in error is counted. There are different methods of assessing the receiver quality:
Measurements
