Does cell phone jammer need a preheat time before using?

Double-shielded coaxial cable's outer shield to ground at both ends or grounding, often to the inner shield grounded signal source, and the other a termination signal to the load side of the ground electronic equipment in the signal is again located in the ground, according to the immunity test results determine if the device termination signal to the system with the stick is connected, in fact, have become ends grounded double shielded cables there are other grounding method, based on the actual use of equipment and systems to be asked to choose more effective grounding method.The required working temperature of MDPB-02 cell phone jammer is -10℃--+55℃.
What is "Magnetic Shielding"? Principle of electromagnetic shielding of electronic equipment and electronic products, EMI (Electromagnetic Interference) energy through the conductive coupling and radiative coupling to the transmission. To meet the electromagnetic compatibility requirements, requires the use of conductive coupling filtering techniques, namely the use of EMI filter components to be suppressed; coupling of radiation shielding technology was needed to be suppressed. Increasing the current density in the electromagnetic spectrum, electromagnetic power density per unit volume increased dramatically, a large number of high-low mix devices or equipment caused by factors such as equipment and system electromagnetic environment is increasingly deteriorating, its importance becomes more prominent.The required relative humidity for MDPB-02 cell phone jammer should be above 80%. Shield is made of metal shells, boxes, plates and other shield, the electromagnetic waves confined to a region in a way. As the radiation source into the electric field near the source region, source and far-field plane wave, so the shield radiation shielding performance based on differences in material selection, structural shapes and apertures leakage control and other aspects are different. In the design to achieve the required shielding performance, you need to first determine the radiation source, a clear frequency range, then the typical leakage according to each frequency band structure, determine the control elements, and then select the appropriate shielding materials, design shielding shell. The radiation shield with the ability to inhibit interference shielding effectiveness SE (Shielding Effectiveness) to measure the shielding effectiveness of the definition: no shield, radiated interference from the source to a point in space (P) field strength 1 (1) and adding shield, the radiation interference source to the space at the same point (P) of the field strength 2 (2) ratio, with dB (decibels) said.