Electrostatic discharge (ESD) and electrical fast transients (EFT) cause different hazards to instrumentation systems. Electrostatic discharge produces strong radio frequency radiation in the frequency range of 5 to 200 MHz.The peak of this radiated energy often occurs between 35MHz and 45MHz, and self-oscillation occurs. The resonant frequency of many information transmission cables is usually within this frequency range. As a result, a large amount of electrostatic discharge radiation energy is stringed into the cable.

Electrical fast transient pulse trains also produce quite strong radiated emissions, which are coupled to cables and chassis lines. When the cable is exposed to a 4～8kV electrostatic discharge environment, the measured induced voltage on the terminal load of the information transmission cable can reach 600V, which is far beyond the threshold voltage value of 0.4V of a typical digital instrumentation, a typical induction pulse The duration is approximately 400 nanoseconds.

Instruments and meters often encounter unexpected voltage transients and surges during using, which can cause damage to electronic equipment. The reason for the damage is that the semiconductor devices (including diodes, transistors, thyristors, and integrated circuits, etc.) in the instruments are damaged. According to statistics, 75% of the failures of instrumentation are caused by transients and surges.

Voltage transients and surges are everywhere. Power grids, lightning strikes, blasting, and even people walking on carpets can generate tens of thousands of volts of electrostatic induction voltage. These are all invisible deadly killers of instruments. Therefore, in order to improve the reliability of instruments and meters and the safety of the human body, protective measures must be taken against voltage transients and surges. The signal surge protector of Jinli Electric escorts the safe use of instruments and meters.