NOYAFA Electronic specializing in testing instruments and cable testers for 16 years
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NOYAFA Electronic specializing in testing instruments and cable testers for 16 years
Author: Noyafa–Cable Tester Manufacturer
The steps and test methods of the cable fault tester are selected. The general doors of our current houses have the function of fire protection, but for large openings, we will use fire shutter doors. Its fire protection function is particularly good, but some The steps and test methods of our cable fault tester are selected in our current house. The general doors have the function of fire protection, but for large openings, we will use fire shutter doors. Its fire protection function is particularly good. But we also need to pay attention to some places. Let’s take a look. 1. When the fire shutter door is opened and closed up and down, check whether there are piles, especially the fire shutter door is linked with the fire protection system, and often because of operation Improper fire shutter door damage, or skew. The general electric rolling door should also pay special attention. The door curtain should be opened and closed at the same time. If the door curtain is skewed or the track is stuck, the door curtain should be opened and closed in time, so as not to cause more damage to the motor and the door curtain. 2. Pedestrians and Mercedes-Benz are prohibited when the fire shutter door is opened and closed, because the door curtain is connected by connecting pieces when the door curtain is opened and closed, and there are also very few unsafe elements in the motor and drive shaft.
Therefore, the curtain should try not to let anyone run when it is recommended. 3. Businesses should also consider more in the selection of materials, simple and durable materials, so that even in special circumstances, they can also play a higher safety issue. Before the cable tester determines the cable fault, in addition to mastering the performance and operation methods of the machine, the tester must first determine the nature of the cable fault in order to adopt appropriate working methods and testing methods.
First, use a megohm or multimeter at one end of the cable to measure the insulation resistance of each phase to ground and between phases, and determine whether it is a low-resistance short circuit or an open circuit, or a high-resistance flashover fault according to the resistance value. 1. When the resistance value is lower than 200~300 ohms, it is a low resistance fault, 0~tens of ohms is a short circuit fault, and the resistance value is extremely high to infinity, which is an open circuit or disconnection fault. Whether the wire is broken, you can also connect the cable terminal to the multimeter and measure the resistance of the short-circuited two phases at the beginning to confirm.
Such faults can be directly determined by the low-pulse method. 2. When the resistance value is very high (hundreds of megabytes and gigabits) and there is an instantaneous discharge phenomenon during high-voltage experiments, such faults are generally called flashover faults, which can be determined by DC high-voltage flash testing. 3. High-resistance fault: The resistance value is higher than the low-resistance fault, and it is determined by the DC high-voltage flash measurement method during the high-voltage test.
4. Determine the point after a rough test in a certain way. If necessary, find the cable path and measure the length or distance of the cable.
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