Test method of earphone socket before use in Dongguan
Release time：2019-10-26 Clicks： Click
How to detect the earphone socket before use? Let's introduce the specific detection methods below.
Earphone socket detection voltage method:
1. It should be acknowledged whether the voltage of power supply pins of each chip is normal;
2. Check whether the reference voltage of headphone socket is normal;
3. Whether the operating voltage of each point is normal, etc.
For example, when the general silicon triode is on, the be junction voltage is about 0.7V, while the CE junction voltage is about 0.3V or less. If the be junction voltage of a triode is greater than 0.7V (especially when the triode is outside, such as Darlington tube, etc.), it may be the open circuit signal injection method of be junction. Add the signal source to the input end, and then measure the waveforms of each point in sequence to see if they are normal, so as to find the fault point. Sometimes we will use a simpler method, such as holding a tweezer in hand to touch the input terminals at all levels to see if there is any response at the output terminal, which is often used in audio, video and other expansion circuits.
Headphone socket current:
It must be that the thicker the conductor, the higher the current intensity is acceptable. But the current density is different. No matter how thick or thin the wire is, the current density it can accept is not different. The current intensity only has nothing to do with the size of the current and the cross-sectional area of the wire. For example, the current of 10 amps is 10 amps no matter how thick the wire is. For example, there is a current of 10A for a conductor passing through an area of 1mm2 and 10A for a conductor passing through 10mm2. Their current intensity is the same, both of them are 10a, but the current density is different. Of course, the current density of 1mm2 is large. In this way, once the current transformer has problems, both the circuit breaker and the lightning arrester cannot remove the faults. The fault will be removed by the trip of the upper level circuit breaker, so as to expand the scale of power failure, and the current transformer will be burnt down together due to the delayed removal fault.
Factors influencing the specular view of Dongguan earphone socket
Dongguan headphone socket series new photoelectric switches usually have the function of actively avoiding each other's interference, so do not worry about each other's interference. However, when several groups of parallel proximity devices are used, the interference of adjacent groups and each other should be avoided. The most useful way to avoid this kind of disturbance is to set the projector and the receiver alternately, and to extend the group distance when surpassing the group. Of course, it is also a good way to use different frequency models. The useful way to avoid disturbing each other is to open the distance.
Dongguan headphone socket and the longer the detection distance, the greater the distance should be. The detailed distance should be determined according to the debugging situation. Of course, it can also use models with different operating frequencies. Mirror point of view effect: when the tested object is glossy or meets the lubricated metal surface, the reflectivity is generally very high, which is similar to the mirror. At this time, the angle between the projector and the tested object device should be formed so that its optical axis is not perpendicular to the tested object, so as to avoid misoperation. Sweep the influence of the setting: when using the reflective decentralized projector and receiver, sometimes the photoelectric switch may not be able to detect safely because the detected object is close to the setting, and the setting may be the object with high reflectivity such as lubrication.