NEWS 2005


New requirements for test equipment as per IEC 61000-4-11

With the publication of IEC 61000-4-11 Ed.2 in 2004 a couple of changed and new requirements have been enforced. These concern a new test level being introduced and changed duration times preferred for voltage dips. The optional voltage variation test has also been changed.

Testing three-phase mains supplies manifests considerable changes. IEC 61000-4-11 Ed.2 separates clearly between mains supplies in star and delta connection.

EM TEST supplies a true three-phase Power Fail System including the required transformer system. For further information about the EM TEST solution please contact your EM TEST representative.

Calibration kit for pulse verification as per ISO 7637-2:2004, Annex D

EM TEST offers a new calibration kit CA ISO for the verification of micro-second pulses and load dump pulses as per
ISO 7637-2:2004. CA ISO includes low inductive resistors with values of 0.5ohm, 1ohm, 2ohm, 4ohm, 10ohm, 20ohm and 50ohm. Hence CA ISO does not only include the load resistors needed as per ISO 7637-2:2004, Annex D but also includes resistors required by manufacturer specifications.

The CA ISO box is plugged directly into the +/- output terminals of the transient generator. The required load resistor is selected by a short-circuit connector. The wave shape across the load resistor can be measured with a 1:100 voltage probe having a sufficient bandwidth and voltage capability (at least 20MHz and 1000V) at the measuring terminals.

CA ISO is compatible to all EM TEST automotive test generators of the 200 Series for micro-second and load dump pulses. For further information please contact your EM TEST representative.

EMC Japan 2005 - Makuhari Messe

EMC Japan 2005 is the annual showcase introducing the latest test equipment, technologies and services. Being represented by Nippon Automatic Control Co. EM TEST showed a large range of EMC test equipment in Makuhari. Apart from the well known solutions for transient and conducted immunity system a number of new products have been exhibited. Among them EM TEST introduced the Load Dump and Field Decay system as per Toyota specification, the new AutoWave and the CWS500D continuous wave simulator for Bulk Current Injection.
From the number of visitors this annual meeting of people involved in EMC confirms once more the increase of the testing demands, especially in the automotive sector.

Autowave - The new Automotive Test System

What else is happening in the battery supply system?

The automotive industry is facing the necessity to investigate the behaviour of the battery voltage variations and their effects to electronic components connected to the supply network of the vehicles, testing emission and immunity. The two major international standards describing test procedures to simulate different phenomena related to the battery supply lines are ISO 16750-2 for 12V and 24V supply voltages and ISO 21848-2 for 42V supply voltage. These test procedures are used by several automotive manufacturers according to their specifications.

However, a large variety of different manufacturer specifications comply with ISO test procedures using different test parameters. Additionally, there are manufacturers specifying procedures not based on any international standards, according to their requirements. Therefore the measuring and test equipment has to be extremely flexible to perform as many measurements and tests as possible using as little equipment as necessary. The new AutoWave manufactured by EM TEST is the adequate instrument allowing simulation of all kinds of voltage profiles for testing immunity of electronic components and investigation of the voltage variations in the battery supply system in conjunction with an adequate DC source. The three main functions of this versatile test and analysing device are:

  • Easy waveform generation of all automotive standars.
  • Generation of all kinds of voltage profiles via software.
  • Repitition of waveforms based on imported data or plot files
  • Recording the voltage variations directly in the vehicle or during
  • Recording the voltage variations directly in the vehicle or during lab testing.
  • Repetition of measured data via DC source or amplifier.
  • Verification of the DUT under real conditions
  • Analysing the recorded voltages and currents via EM TEST
  • Transfer al of measured data to other analysing programs such as MathLab

For further information about the AutoWave please contact us or your local representative.


Harmonics and Flicker Calibration Using Fluke 6100A

EM TEST is pleased to announce that the Fluke 6100A Electrical Power Standard represents the first commercially available tool providing full assistance for the calibration of harmonics & flicker analysers. Apart from its versatile power verification functions, the instrument fulfils all standards requirements comprehensively, accurately and reliably. This is unique to the Fluke 6100A Electrical Power Standard. Hence measurements are performed correctly and are repeatable.

For fully compliant harmonics & flicker validation the following functions are mandatory:
- Accuracy and linearity of voltage and current measurement procedures.
- Steady state harmonic measurement procedure.
- Fluctuating harmonics measurement procedure.
- Verification of the smoothing function (digital first order low pass filter).
- Inter-harmonic measurement procedure.
- Accuracy of power measurement and the related harmonics limit calculation for class D equipment.
- Flicker measurements at 230V/50Hz and 120V/60Hz.
- Increasing & decreasing of flicker values Pst as a function of dU/U variation at constant repetition rate
  (at 230V/50Hz & 120V/60Hz).

EM TEST has done a comprehensive investigation of functionality and accuracy of the new Fluke 6100A Electrical Power Standard. This tool renders National Metrology Institutes the opportunity to issue official laboratory accreditation for comprehensive flicker parameter calibration. NPL, being recognised as the reference and most sophisticated competent body for harmonic & flicker analyser calibration, has not yet achieved this complete level of verification capability offered by the Fluke 6100A Electrical Power Standard.

In conclusion of the above is obvious that EM TEST fully support this new calibrator and does highly recommend it to all interested calibration laboratories or similar competent bodies for verification purpose.

More information about the Fluke 6100A Electrical Power Standard is available from Fluke's web site.

Automotive Semimar at Sameer in Chennai, January 2005

Another seminar was held at Sameer in Chennai being dedicated to customer's of Sameer. EM TEST had been invited to introduce the latest about EMC standards and requirements. Concentrating on automotive testing the topics addressed were transient testing, ESD testing, battery voltage simulation, BCI testing and audio frequency testing. The audience of nearly 30 delegates from various companies of the Chennai Area very well received our presentation.

SIAT Symposium and Exhibition in Pune, January 2005

In late January 2005 EM TEST along with our Indian partner Complus Systems Pvt. Ltd. participated at the annual SIAT symposium and exhibition. This year this important event was hosted by ARAI (Automotive Research Association of India) in Pune.
EM TEST was honoured to supply two technical papers to deal with BCI testing and Battery Voltage simulation in automotive. The paper about Battery Voltage Simulation was also presented in the Technical Sessions being well received by the audience of approx. 60 participants, all being related to the car industry in India.

New Requirements for Harmonics & Flicker Analyzers ahead

The specifications for harmonics and flicker analyzers change. The new regulations will become mandatory within short.

The new edition of IEC 61000-4-7 Ed.2:2002 asks for two different measuring windows:

  • 10 periods per window for 50Hz
  • 12 periods per window for 60Hz with the windows being rectangular windows.

No gap and no overlapping of successive windows are allowed. The rectangular windows need to be accurately synchronised to the fundamental frequency. Furthermore the new IEC 61000-4-7 edition introduces a grouping procedure of harmonics and interharmonics. Interharmonics between two adjacent harmonics are added to the nearest harmonics as per the stipulated calculation formula. IEC 61000-4-15 Ed.1.1:2003 specifies a new flicker meter for 120V/60Hz AC supplies and gives a more accurate description for the weighting filter design.
Once the transition period is elapsed only analyzers meeting the new design specifications can be considered to be full compliant. EM TEST DPA500 and DPA503 harmonics and flicker analyzers already meet these new requirements.
For older analyzers an upgrade of hardware/firmware and software is offered in order to meet the latest requirements.

For further information please contact us or your lokal EM TEST representative

NEWS 2005

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