AC /DC Dips and Ripple Test:

AC voltage dips, DC voltage dips, and ripple immunity testing are vital evaluations performed to ensure the robustness and reliability of electronic devices when exposed to variations and disturbances in the power supply.

              AC Voltage Dips Testing:

  • AC voltage dips refer to sudden and short-term reductions in the amplitude of the AC voltage supply. These dips can occur due to various reasons such as grid faults, switching operations, or heavy equipment startup.
  • During testing, devices are subjected to controlled reductions in AC voltage levels for specified durations and depths. The purpose is to verify that the equipment can continue to operate within acceptable parameters without malfunctioning, resetting, or being damaged during these voltage dips.
  • IEC/BS EN 61000-4-11 is a standard that specifies test procedures and immunity levels.

              DC Voltage Dips Testing:

  • DC voltage dips are similar to AC voltage dips but involve reductions in the DC voltage levels. These reductions might occur due to transient events in the DC power supply or when certain loads draw excessive current suddenly.
  • Devices undergoing testing are exposed to controlled reductions in DC voltage levels to assess their resilience. The objective is to ensure that the equipment maintains functionality and performance even when experiencing dips in the DC power supply.
  • IEC/BS EN 61000-4-29 is a standard that specifies test procedures and immunity levels.

    Ripple Immunity Testing:

  • Ripple immunity testing evaluates a device’s resistance to variations or fluctuations in the DC voltage or current, known as ripple. This ripple often occurs due to imperfect power supply filtering or switching regulators.
  • The test involves subjecting the device to specified levels of ripple in the power supply to determine if it can operate as intended within these conditions. It verifies that the internal components of the device can tolerate the ripple without causing malfunctions or performance degradation.
  • IEC/BS EN 61000-4-17 is a standard that specifies test procedures and immunity levels.

    These tests collectively aim to assess a device’s immunity to disturbances in the power supply, ensuring that they comply with industry standards and regulations for electromagnetic compatibility (EMC) and power quality. Devices that successfully pass these tests demonstrate their ability to operate reliably in real-world scenarios where voltage fluctuations or ripple might occur, providing assurance to consumers and meeting certification requirements for market compliance.

CLASSTest Levels and durations for voltage dips(ts)(50 Hz/60 Hz)
Class 1Case-by-case according to the equipment requirements
Class 20 % during ½ cycle0 % during 1 cycle70 % during 25/30 cycles
Class 30 % during ½ cycle0 % during 1 cycle40 % during 10/12 cycles70 % during 25/30 cycles80 % during 250/300 cycles

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