Combination wave generators provide the necessary waveform to simulate over-voltages from switching and lightning transients. There are many standards fall under the category of surge testing for immunity, the most most common include EN/IEC 61000-4-5 and ANSI C62.41. Surge waveforms are generally defined by their voltage, front time, and time to half value. The voltage levels, source impedance, and other factors will be determined by the associated test level and standard. Below you will find a video walking through the setup and capabilities of the Teseq NSG 3060.
1.2 μs x 50 μs Pulses
10 μs x 700 μs Telecom
2 μs x 10 μs Telcordia
Voltage Ramp Surges
General System Information
Given the wide range of manufacturer's there is a variety of different equipment capabilities and characteristics making them unique. Most systems do however include a coupler, front panel, and other basic components. For most equipment the built in coupling decoupling network (CDN) provides single phase capabilities, usually not exceeding 300 Volts/32 Amps (EM Test NX5-32). Usually additional external couplers are available for a variety of different type of lines and power requirements. The majority of systems also include a user interface that includes programmed routines and standards allowing for effective testing.
Surges generators designed around around the IEC 61000-4-5 standard involve both current and voltage surges, hence the combination wave. This is key key component to conducted immunity testing. Many systems offer burst to IEC 61000-4-4 included in the same system platform. Often times the most common tested telecom pulse, 10μs x 700μs can be added as a module or board to existing system enhancing testing capabilities. This customization makes how the systems are configured crucial to meeting testing needs. This type of interference is often tested to by putting the waveform on several different degrees on the sine wave, making communication with the CDN crucial.
Common 6kV Rental Systems
Our rental inventory of conducted immunity test systems, including combination wave capabilities, offer a wide range of testing capabilities. They are updated all compliant to the latest versions of IEC 61000-4-4 and IEC 61000-4-5. The systems also all have current ISO 17025 accredited calibrations and often come with a laptop with software installed arriving ready for testing to begin.
Coupling Networks are designed to put different pulses onto a variety of cabling including power mains lines. The power mains are the most commonly tested, given that is where this type of interference most often occurs. The CDNs are generally broken out by single and three phase capabilities. Generally, most surge platforms offer a built in coupler designed for power mains capable of around 250 volts 16 amps AC. Coupling of surge pulses onto AC lines, given line synchronization, requires communication with the associated generator, ensuring the pulse is on the correct position. Our couplers can be rented individually to supplement existing testing capabilities and come with current ISO 17025 accredited calibrations.
Application of surges and other transient EMI onto data lines fall under a variety of different test standards including IEC 61000-4-5. The configuration of the type of cable or line will determine the coupler that needs to be used. We offer rentals of a variety of different networks, individually and with the associated generators. The correct CDN will be required to correctly apply surges to associated data cables. It is also advisable that the corresponding generator be used with the correct CDN ensuring capability.