IEC 60968 Figure 3 Bending Moment Test Arrangement | Lampholder Bending Moment Tester

IEC 60968-Figure 3 Test Arrangement For Bending Moment Imparted By The Lamp At The Lampholder

The IEC 60968 Figure 3 Bending Moment Test Arrangement is used to evaluate the mechanical stress that a lamp imposes on its lampholder. According to IEC 60968 Figure 3, the test determines whether the bending moment generated by the weight and design of the lamp remains within acceptable limits.

This test arrangement typically consists of a support structure, a flexible connection cord, and a digital force gauge. By measuring the force required to hold the lamp in a free-bending position and calculating the bending moment, manufacturers can verify compliance with mechanical safety requirements.

Technical Parameters

The Bending Moment Test Arrangement is constructed from aluminum to provide a lightweight yet stable testing platform. The integrated digital force gauge provides clear force readings with 0.1 N resolution, supporting consistent bending force measurement. The flexible cord connection allows the lamp to hang freely, simulating actual installation conditions and enabling consistent test results.

This straightforward yet effective design supports laboratories and manufacturers in performing repeatable bending moment tests in line with IEC 60968 requirements.

Testing Principle

IEC 60968 Figure 3 specifies a standardized method to evaluate the bending moment that a lamp imparts on its lampholder. Excessive bending moment can cause mechanical stress, loosening, or long-term damage to the lampholder. This test helps manufacturers verify that the combined mass and design of the lamp remain within acceptable mechanical limits.

The test arrangement allows the lamp to hang freely from the lampholder position through a flexible connection. A digital force gauge measures the force required to maintain this position. The bending moment is then calculated using the formula M = F × L, where F is the measured force and L is the specified lever arm distance. This approach provides a practical and repeatable way to assess mechanical compatibility between lamps and lampholders.

Common Error Mitigation

To obtain accurate and reliable bending moment test results, the following practices are recommended:

• Ensure the lamp hangs freely without obstruction or contact with any part of the test setup during measurement.
• Accurately measure and record the lever arm distance in accordance with the requirements of IEC 60968 Figure 3.
• Use a properly calibrated digital force gauge to obtain consistent and traceable force readings.
• Conduct the test in a stable environment, free from vibration, fixture movement, or external disturbances that could affect measurement accuracy.
• Record both the force value and lever arm length clearly, and calculate the bending moment correctly before comparison.
• Compare the calculated bending moment against the limits specified in the applicable standard table to determine compliance.

Primary Use Cases & Business Value

This Bending Moment Test Arrangement helps lamp manufacturers, lampholder manufacturers, and testing laboratories verify compliance with the mechanical requirements of IEC 60968 and IEC 62560. It provides a simple and effective method to measure the mechanical stress imposed on lampholders, supporting product development, quality control, and certification processes.

Industrial Applications & Lab Scenarios

• Lamp manufacturers — Bending moment verification for self-ballasted lamps
• Lampholder manufacturers — Mechanical compatibility and strength testing
• Testing laboratories — IEC 60968 and IEC 62560 compliance testing
• Quality assurance departments — Routine inspection and validation
• Research and development teams — Lamp design evaluation

Strategic Procurement Advantages & Global Support

• Simple and effective test arrangement for IEC 60968 Figure 3
• Includes digital force gauge for accurate and convenient measurement
• Lightweight aluminum construction for easy handling
• Suitable for lamps fitted with common screw or bayonet caps
• Technical support available for test setup and standard interpretation