Rent combination wave surge and electrical fast transient EFT generators designed for compliance to IEC 61000-4-4 and IEC 61000-4-5 test requirements. These systems are typically broken down by the 4kV surge and 6kV surge test levels, with the higher voltage systems providing capabilities for 100kHz ringwave as well.
Given the modularity of generators in the market, systems can be configured as a stand alone EFT system (as with the EM Test UCS 500N5E), or integrated with a variety of different capabilities. This typically includes a standard single phase built-in CDN designed for both AC and DC power up to 16amps. However, when renting these variety of EMI test systems, it is important to ensure system meets all required pulse capabilities in advance.
Coupling decoupling networks (CDNs) are the devices used to couple pulses onto different types lines (AC, DC, Data, etc.). Capacitive coupling clamps are designed to couple EFT onto data lines at prescribed lengths in accordance with IEC 61000-4-4. At lower DUT/EUT current and voltage levels (typically less than 32 amps 3-phase power) the CDNs will have capabilities for coupling both EFT and Surge pulses. This is also true for the newer three phase CDNs automatic couplers where the equipment adjusts to the associated EUT current level automatically.
When conducting testing for compliant surges to IEC 61000-4-5 it is recommended to use the correct corresponding coupler with the associated generator (same manufacturer etc.) This helps to ensure communication and line synchronization between the the coupler and transient generator allowing for pulses to be applied at the correct degree.
Pulse verification for surge is done by monitoring both voltage and current waveforms. This is accomplished by the use of a current monitoring probe (Pearson 110) that has capabilities measure the fast pulse and a high voltage differntial probe for the voltage waveform. EFT is typically monitored with an EFT verification kit, which can be measured both from the direct out and after the capacitive coupling clamp (if used).
These are often seen done prior to testing to verify that the generator is indeed providing the correct associated pulse within specifications. It is highly recommended when possible to ensure accurate test results that this be done.
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