MBN 10 305-1 Electrical or Electronic Environmental Testing - Part 1: Test Specifications

The standard "MBN 10 305-1 Electrical or electronic environmental testing - Part 1: Test specifications" developed by the Mercedes-Benz Group describes environmental test methods for the qualification of electrical or electronic components in automotive applications. This standard is used together with the standard "MBN 10 305-2 Electrical or electronic environmental testing - Part 2: Test selection process".

The final decision to use or modify the test methods described in this standard for specific component applications lies with the Mercedes_Benz Group management. Deviations from the requirements contained in this standard are specified in the component-specific release document. Any questions regarding the content or application of this standard should be directed to the Mercedes Benz Group team.

For the purposes of this standard, the following terms and definitions apply:

• Ambient temperature refers to the temperature surrounding the component being tested in a test chamber or as installed in the vehicle.
• Component refers to any electrical or electronic parts used in the vehicle, such as engine control module, instrument panel, junction block, sensor and switch.
• The component-specific published document expresses the component-specific requirement specifications.
• The crest factor is defined as the peak above the Grms value in a vibration test. It is sometimes called the sigma value or sigma clipping.
• Intermittent operation: When a component undergoes a predefined time cycle of operating and non-operating conditions during testing, the component is considered to be in an “intermittent” operating condition. The intermittent operating frequencies specified in some tests in this standard are for guidance purposes only and the releasing engineer shall specify the optimum operational range for his or her component in the component-specific release document.
• IP class is the international classification of protection against solid or water ingress for automotive applications as described in the ISO 20653 standard.
• A component is considered “inoperative” if it is connected to a power source but does not perform any normal operating function during testing.
• A working component is considered working if it performs the functions experienced during tool operations.

All materials, procedures, processes, components or systems must comply with the requirements of applicable regulations (including those related to regulated substances and recyclability).

This standard divides the environmental stresses typically experienced by electrical or electronic components in a vehicle into four groups:

• Climatic stresses: This category includes tests to demonstrate compatibility with climatic stresses such as temperature, humidity, and solar radiation.
• Mechanical stresses: This category includes tests to withstand the effects of mechanical stresses such as vibration, mechanical shock, switch mechanical operations, and handling drop.
• Solids/fluids stresses: This category includes tests to demonstrate the component's compatibility with solids and fluids such as dust, water, rain and steam.
• Chemical stresses: This category includes tests to demonstrate the component's resistance to the corrosive effects of certain pollutant gases, salt fog environments, and situations involving accidental liquid spills.

As shown in the table provided in the standard, five temperature classes are defined according to the maximum ambient temperature that can occur at the component's installation location:

• Class I: Maximum temperature 85 degrees
• Class II: Maximum temperature 105 degrees
• Class III: Maximum temperature 125 degrees
• Class IV: Maximum temperature 155 degrees
• Class V: Maximum temperature determined experimentally

If location-specific temperature data from testing or field measurements are available, it is possible to use a unique experimentally determined temperature class V for a component. In all cases, the maximum temperature should be measured to verify in-vehicle application for all temperature classes.

Among the numerous testing, measurement, analysis and evaluation studies that our organization has carried out for businesses in various sectors, it also provides testing services defined in the standard “MBN 10 305-1 Electrical or electronic environmental testing - Part 1: Test specifications” with its trained and expert staff and advanced technological equipment.