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FEATURE TEST & MEASUREMENT


EMC TEST SOFTWARE: NATURAL EVOLUTION


The Rohde & Schwarz EMC32 EMC software deployed worldwide is gradually being replaced by R&S Elektra. The successor software now supports automation and control of EMI systems and contains high-performance modules for EMS measurements


D


eveloping complex and exceptionally versatile EMC test software is not a


trivial task. The first modules unveiled in 2017, with the base module (R&S Elemi- E), were aimed at developers who test the electromagnetic interference (EMI) of their prototypes before EMI certification. The new R&S Elemi-A and R&S ElemI-S


modules for EMI measurements expand the range of applications for product testing and certification. The software controls the measurement of conducted and radiated disturbances in line with commercial, automotive and military standards. It allows users to choose the depth of automation. Everything is configurable – from manual interactive measurements to virtually fully automatic test sequences. Not only can it remotely control turntables and masts from all current manufacturers, it can also search for peaks in EMI measurements and perform final measurements fully automatically with exact peak searching by varying the frequency, mast and turntable settings. Convenient functions for scheduling test scenarios and generating test reports boost efficiency and throughput in the test lab. To measure electromagnetic susceptibility (EMS), the EUT is exposed to defined electromagnetic disturbance and tested to see if it also functions flawlessly under unfavourable ambient conditions, such as occur in the vicinity of large electric motors or radio equipment. R&S Elektra operates in line with the commercial standards IEC/EN 61000-4-3


6 MARCH 2019 | ELECTRONICS and 61000-4-6.


For accurate test results, the field strength of the disturbance field must be as uniform as possible. Each test setup is therefore subjected to extensive, standardised calibration of field strength and field uniformity. This new software performs this calibration and subsequent evaluation largely automatically. The user only has to position the field probe. After successful calibration, the generator produces signals with the right level under all conditions, taking into account the antenna characteristic, amplifier characteristic, losses in cables and RF switches, and anechoic chamber attenuation. During the test, the EUT is monitored


from outside the chamber to verify that it behaves as intended. For this purpose, besides monitoring USB or LAN interfaces it is often necessary to also check status lamps, displays or screens using video systems in the anechoic chamber. This is handled by the company’s AdVise software, which is


Figure 1:


Control centre for complex measurements: the dashboard with tiled symbols for fast access


perfectly matched for video evaluation and recording, and relieves users of the tedious task of constant visual monitoring. Extensive libraries in the new test


software provide information about the required test setup and components dependent on the test standard. The software automatically recognises T&M instruments and system components if they are connected to the computer or the network. This minimises the number of settings necessary to get tests up and running. For prior checking of the correctness of all settings, the process can be simulated in the software without occupying physical instruments or an anechoic chamber. The user pins all link tiles necessary for the measurement task to the dashboard (Figure 1). Filter functions, for example for frequency bands, keywords or standards, reduce the display to the essentials. Important settings and parameters for a test can be viewed and edited at any time. Is there an error in a limit line? That can easily be corrected in the test sequence description. A power meter not connected? Also no problem; it can simply be added to the hardware setup during the test. Working on other things during a


Figure 2:


Test plan with various subtests


measurement process, such as creating reports, defining tests or comparing results, is also supported. To help maintain an overview, test plans provide support for extensive test sequences. For each EUT, they specify in advance, which tests must be performed (Figure 2) and show the status of individual measurements. A mouse click creates an overall report that can be optimised with structuring and formatting functions, or edited using external word processing programs.


Rohde & Schwarz 01252 818 888 T: 01582 814006


/ ELECTRONICS

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