Before conducting any testing, it is important to verify that the temperature of the chamber used for the tests is properly regulated. This helps prevent erroneous readings due to the extreme temperatures involved in tests such as ball pressure testing. Our chambers are equipped with a variety of temperature control features including adjustable PLC controls and smart thermostat modules for accurate readings. The temperature of the chamber should be verified using a thermocouple prior to beginning any test at an assigned level of accuracy.
|Number of Stations||One Station|
|Temperature Range||+10℃~ 200℃|
|Weights Capacity||20 N|
|Constant Temperature||Hot Air Circulation|
|Ball End Diameter||5 mm|
|Power Consumption||1000 W|
|Equipment Weight||About 70KG|
Before any ball pressure test is conducted, the sample must be properly placed and secured within the hot temperature chamber. Generally, the sample will be secured onto a special jig or holder that is made to fit inside the chamber. It is important to make sure that the sample is correctly positioned near the center of the chamber so that it can receive uniform heat across all sides of itself. Additionally, take care to not move or disturb the sample while test are being conducted in order to get accurate results.
After conducting a wire and cable specimen ball pressure test in our hot temperature chambers, we employ sophisticated data analysis techniques to calculate the final results. To ensure accuracy and reliability of these results, all data points collected during the test are compared using advanced algorithms. This makes it possible to isolate any inconsistencies or irregularities in the pressure readings that may have occurred during the course of testing. By implementing these comprehensive data analysis techniques, we can guarantee accurate calculation of ball pressure results even in extreme hot temperature conditions!
Ball pressure test apparatus can be used to test the heat and pressure resistance of wires. Place the test piece on the platform in the temperature chamber at 125±2°C, and then press the ball end of the ball pressure tester against the test piece. After testing for 1 hour, take out the test piece and put it in cold water for 10 seconds, then measure the sag value. Within 2mm is qualified.
In electrical products, the heat resistance, flame resistance and tracking resistance of non-metallic materials and insulating materials directly affect the safety of products. Usually, the heat resistance, flame resistance and tracking resistance of non-metallic materials and insulating materials are tested by the following test methods: ball pressure test, glow wire test and resistance (comparison) tracking index test. From the perspective of specific implementation, this paper analyzes the standards and discusses the most important factor affecting the test results in the ball pressure test – test temperature.
The ball pressure tester is composed of a pressure ball with a diameter of 5mm ±0.5mm (rolling bearing finished steel ball conforming to ISO3290-1) connected to the weight system, which is designed to exert a vertical downward force, The mass containing the stress ball corresponds to a load of 20N ±0.2N.
In the ball pressure test, the control of the sample temperature includes two aspects. The first aspect is the selection of monitoring points. The closer the thermocouple is to the sample, the closer the measured temperature is to the actual temperature of the sample. GB/T5169.21-2017 recommends installing a thermocouple at a distance of 3 mm from the center of the sample support to the upper surface of the support to measure the temperature. In actual operation, if this cannot be achieved, try to place the thermocouple as close to the sample as possible to achieve the purpose of monitoring the temperature of the sample.
The second aspect is the control of the test time under the specified temperature. The ball pressure test time of 60 minutes refers to the time from placing the loading device on the sample to taking it off. During the period when the oven is opened to place the sample and the loading device, the temperature in the oven will inevitably drop below the test temperature. Therefore, the proficiency of the test personnel and the heating speed of the oven may affect the test results. The more skilled the operation, the faster the heating speed of the oven, the easier it is to re-reach the required test temperature, and the more accurate the test results will be.
|According to the test requirements, put the ball pressure test apparatus in the heating chamber for a long enough time to ensure that the ball pressure test device has reached a stable test temperature before the test starts.||Test Methods & Instructions|
|Place the component under test on the support base so that it is in direct contact with the support base.|
|Place the surface of the tested specimen in a horizontal position, and press the steel ball against the surface. The test should be carried out in a temperature oven with a temperature specified in the standard.|
|After the test reaches the time specified in the standard, remove the ball from the sample, and after cooling according to the requirements specified in the standard, measure the diameter of the indentation of the steel ball to determine whether it is qualified.|
Wewon’s ball pressure test apparatus is suitable for electrical and electronic products such as lighting equipment, low-voltage electrical appliances, household appliances, machine tool appliances, motors, electric tools, electronic instruments, electrical instruments, information technology equipment, electrical business equipment, electrical connectors and accessories, and the research, production and quality inspection departments of component parts are also applicable to the insulation materials and engineering plastics industries.
The ball pressure test is to press the steel ball (R2.5mm) and the ball pressure tester with a total test value of 20N ± 0.2N on the surface of the test object in a horizontal state and placed in the heating chamber. After 60min ± 1min at the specified temperature of the test sample, quickly (<10s) immerse the test sample in water at 20°C ± 5°C to cool for 6min. Measure the diameter of the indentation on the surface of the sample within 3 minutes after taking it out of the water. Depending on whether the diameter of the indentation exceeds 2mm, the thermal deformation resistance of the test product at the specified temperature is evaluated.