IEC 61000-4-29 Voltage Dips, Short Interruptions, and Voltage Variations Compliance Testing
IEC 61000-4-29 evaluates the immunity of electrical and electronic equipment when subjected to voltage dips, short interruptions, and voltage variations. As a leader in EMC regulatory compliance testing, Keystone Compliance assists electronic equipment manufacturers with EMC testing. Meeting the IEC, EN, and other EMC immunity testing requirements can be challenging. Not only do we understand the challenges, but we help guide companies through the process.
Keystone’s EMC testing engineers streamline the process and assist companies to achieve the compliance they require. Our proven process helps avoid product launch delays. We take pride in providing the peace of mind that all of your unintentional radiator testing needs will be met.
Summary of IE 61000-4-29 EMC Immunity Testing
IEC 61000-4-29 evaluates electronic and electrical equipment immunity when subjected to voltage dips, short interruptions, and voltage variations. This standard test method applies to low voltage d.c. power ports. Specifically power ports of equipment supplied by external d.c. networks.
Voltage dips and short interruptions are caused by faults in the d.c. distribution system. They can also be caused by sudden large changes of loads.
On the other hand, voltage interruptions are caused by switching mechanical relays when changing from one source to another. An example includes changing from a generator set to a battery.
Voltage variations are usually caused by the discharging and recharging of battery systems. However, they are also created when there are major changes to the load condition of the d.c. network.
These phenomena are random in nature. They can be characterized in terms of the deviation from the rated voltage, and duration.
IEC 61000-4-29 Immunity Testing Program
The IEC 61000-4-29 test is performed with the shortest possible power supply cable length suitable for the unit’s intended application.
Immunity testing includes the following:
- The verification of the laboratory reference conditions
- The initial validation of the correct operation of the equipment
- The execution of the test
- The evaluation of the test results
For each test, any degradation of performance is recorded.
Generally, climatic conditions are specified for the unit’s operation under testing and the test equipment by their respective manufacturers. No condensation is allowed during the test in regards to having a high relative humidity.
IEC 6100-4-29 Test Procedure
The unit under testing is configured for its normal operating conditions. The test is performed according to a specified test plan. This plan must consist of the following:
- Test levels and durations
- Representative operating conditions
- Auxiliary equipment
For each selected combination of test level and duration, a unit is tested with a sequence of three dips/interruptions in 10-second intervals. Each representative mode of operation is tested.
Short interruption tests are carried out with the generator set to:
- Block reverse current from the load
- Absorb negative inrush current from the load
Voltage dip and short interruption testing can cause transient overvoltages to appear at the unit input terminals.
The unit is tested for each voltage variation at 10-second intervals.
IEC 61000-4-29 Test Results and Report
After testing, the results are classified as loss of function or decline in performance. However, if a manufacturer defines effects on the EUT as insignificant, the results are therefore acceptable.
The test report contains the information necessary to reproduce the test. In particular, the following is recorded:
- Identification of the unit under testing
- Special environmental conditions
- Performance level defined by the manufacturer
- Performance criteria
- Any effects on the unit under testing observed during or after the test disturbance
- Any pass or fail performance criteria
- Results of the immunity tests
Expert IEC 61000-4-29 Immunity Compliance Test Lab
Our team strives to give our customers more time and energy on product development instead of testing. Keystone has a full lab of test equipment which permits us to provide short lead times on scheduling.