What is Test Method of Impulse Limiting Voltage on Signal SPD?

HIMALAYAL - SHANGHAI - CHINA

Signal surge protection device (SPD) is extensively applied in the communication, signal, measurement and industrial control systems, and is used to protect the port, which is sensitive to over-voltage. As for this equipment, impulse limiting voltage directly represents the performance of limiting over-shoot. Both manufacturers and users pay close attention to this indicator.

However, it is found that measured value of signal SPD impulse limiting voltage fluctuates widely. The measured value of the same test object used in different pieces of equipment is very different. Even if the equipment and test object are the same, the measured value still varies greatly according to different test time. The change ranges from 20% to 60%, even higher. This will have severe influence on accurate measurement of parameter and result comparison, and also not helpful for the promotion and application of the whole series of signal SPD.

The root cause for great difference is that test method regulated by test standards has its own defects, resulting in the uncertainty of test conditions. For instance, proposed test method is not suitable for precise data measurement, and we lack technical code for managing test equipment.