Rohde & Schwarz CMU-K20, Руководство по эксплуатации

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CMU-K20/-K21/-K22/-K23/-K24 Menu Structure
1115.6088.12 3.1 E-10
3 Manual Control
This chapter gives a brief survey of the operating concept and the structure of the user interface for
GSM mobile phone tests. The CMU was designed for maximum operating convenience and flexibility.
All instrument functions are grouped together in menus, each of them provides a number of related con-
figuration settings or displays a group of measured quantities. All menus show a similar structure so that
many settings, once defined, can be used in several measurements. Switchover between the different
menu groups and test modes
(Signalling – Non Signalling) is possible at any time.
In the following, the different measurement modes and measured quantities are discussed. Settings and
measurement parameters frequently encountered are explained from a general point of view.
The formal aspects of measurement control are discussed in more detail in chapter 5 (Remote Control –
Basics) . For a presentation of the CMU's control elements, menu types and dialog elements within the
menus refer to chapter 3 of the operating manual for the CMU basic unit.
Menu Structure
The menus used to control GSM measurements can be arranged in different ways. From the functional
point of view, they form the following groups:
•
The function groups GSM400-MS, GSM850-MS, GSM900-MS, GSM1800-MS and GSM1900-MS
•
The two test modes Signalling and Non Signalling
•
General configurations (Connection Control) , configurations specific to a measured quantity (Power
Configuration, Modulation Configuration, Spectrum Configuration, Receiver Quality Configuration) ,
and menus displaying the results of the measurement (Analyzer/Generator, Overview, Power
(P/Time, P/Slot, P/Frame etc.) , Modulation (Extended Phase Error, Overview, EVM, Phase Error,
Magnitude Error) , Spectrum (due to Modulation and due to Switching), Receiver Quality)
In a more formal sense, the CMU uses main menus, popup menus, graphical measurement menus and
dialog windows of various size. This aspect is discussed in chapter 3 of the operating manual for the
CMU basic unit.
Test Modes
GSM measurements are performed in one of the two modes Signalling or Non Signalling . The Non Sig-
nalling mode is typically used for module tests or test of mobiles in a special "test mode". The Signalling
mode serves to measure the mobile phone performance under realistic operating conditions where the
CMU mimics a GSM base transceiver station.
Definition
The term signalling denotes all actions necessary to establish, control and termi-
nate a communication between the base station and the mobile phone. The sig-
nalling messages conveyed allow the mobile station and the network to discuss
the management of issues either related to the user or concerning technical
aspects of the communication.
Non Signalling
Mode In the Non Signalling mode, the CMU generates an RF signal conforming to
GSM specifications and analyzes the signal with GSM characteristics (i.e. with
definite level in the designated channel and in the adjacent channels, definite
phase and frequency, and bit content) retransmitted by the device under test. No
signalling parameters are transferred so that test times can be reduced consid-
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