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EN 61000-4-29 (Immunity)
EN 61000-4-29 establishes immunity test methods for electrical and electronic equipment connected to DC power supplies. The standard evaluates how equipment responds to voltage dips, short interruptions, and voltage variations occurring at DC input power ports.
Clark Testing provides EN 61000-4-29 EMC immunity testing for manufacturers and engineering organizations evaluating equipment for operation during disturbances in DC power systems.
EN 61000-4-29 Immunity Testing
Equipment powered by DC sources can experience temporary changes or interruptions in supply voltage caused by switching events, power-system disturbances, battery conditions, or other electrical events.
EN 61000-4-29 provides standardized methods for evaluating equipment performance when these disturbances occur.
Testing may evaluate equipment response to:
- Voltage dips
- Short interruptions
- Voltage variations
- Changes in DC supply voltage
- Equipment operation during disturbances
- Equipment recovery following exposure
- Functional performance before and after testing
The applicable test levels, durations, operating conditions, and performance criteria depend on the equipment and qualification requirements.
DC Voltage Dip Testing
A voltage dip occurs when the DC supply voltage temporarily decreases from its normal operating level.
During EN 61000-4-29 testing, controlled reductions in DC supply voltage are applied to the equipment under test. Equipment performance can then be monitored to determine its response to the specified disturbance.
Testing can help identify unintended resets, loss of functionality, performance degradation, or other responses associated with temporary reductions in DC input voltage.
DC Short Interruption Testing
Short interruptions represent a temporary loss of DC input power.
EN 61000-4-29 testing can evaluate how equipment responds when its DC supply is interrupted for specified periods and subsequently restored.
Depending on the applicable performance criteria, equipment may be evaluated for continued operation, controlled response, automatic recovery, or proper operation following restoration of power.
DC Voltage Variation Testing
DC-powered equipment may also be required to operate while the supply voltage varies from its nominal value.
Voltage variation testing evaluates equipment performance at defined DC supply conditions to determine whether the equipment continues to operate as required.
These evaluations can be particularly important for equipment connected to battery systems, DC distribution systems, transportation equipment, industrial controls, and other applications where supply voltage may vary during normal operation.
EMC Immunity and Equipment Qualification
EN 61000-4-29 may be only one portion of a broader electromagnetic compatibility qualification program.
Clark Testing supports EMC and EMI programs involving a range of conducted and radiated immunity and emissions requirements. This allows manufacturers to coordinate multiple EMC requirements within a broader product qualification program.
Testing capabilities may include:
- Conducted immunity testing
- Radiated immunity testing
- Electrostatic discharge testing
- Electrical fast transient testing
- Surge testing
- Voltage dip and interruption testing
- Magnetic field immunity testing
- Conducted and radiated emissions testing
EN 61000-4-29 Testing at Clark Testing
Clark Testing works with manufacturers, suppliers, and engineering organizations to develop EMC test programs based on applicable standards and customer requirements.
Our team can review the equipment configuration, DC input characteristics, applicable EN 61000-4-29 test levels, operating modes, monitoring requirements, and performance criteria to develop an appropriate test approach.
Contact Clark Testing to discuss EN 61000-4-29 DC voltage dip, interruption, and variation testing or a broader EMC qualification program.