Basic principle of the hottest tracking and positi

2022-08-23
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Basic principle of tracking and positioning cables

most electrical professionals and technicians will encounter the need to track cables or wiring systems from time to time. This work is boring and a waste of time. In addition, it is often necessary to determine which safety device is connected to a specific circuit, or to identify and track metal pipes, heating pipelines or underground cables. The new fluke 2042 cable detector is a specially designed multi-purpose tool, which is used to help users in this large-scale engineering and industrial production applications that play an important role in improving combat effectiveness and protecting normal work

Figure 1 - a practical instrument box, including accessories, is provided with fluke 2042 cable detector

working mode

fluke-2042 cable detector includes a transmitter and a receiver. The transmitter provides a modulated AC voltage to the corresponding cable, which will generate an electric field around the cable; The receiver is equipped with a coil. If the receiver is placed close to the corresponding electrical conductor, the flux line will pass through the coil and enter the receiver. This phenomenon is also called penetrating coil. A small voltage will be generated in the circle, and the electronic circuit of the receiver will calculate this voltage and display it on the display screen. The special feature of fluke-2042 is that the transmitted signal is digitally encoded. This can ensure that the signal can be clearly received by the receiver, which can avoid false display caused by any interference field (such as electronic fluorescent lamp ballast or frequency converter)

display of fluke 2042 receiver

display of fluke 2042 transmitter

generally speaking, there are two different application principles

application without voltage

typical applications are to locate switches and junction boxes that are accidentally covered by wall paint. Almost anyone is familiar with such a situation: install switches and junction boxes, 266 doors and roller shutters, and wear the cables used in the new equipment. After painting the wall with paint, you can't find all the sockets

in this case, it is sufficient to apply a signal to any wire in the cable that needs to be tracked. The other pole of the signal transmitter is connected to the ground potential through a ground wire. It is very important to ensure the drying of building materials

Figure 2 - working principle of fluke 2042 cable detector

applications with voltage

there are often no labels on the circuits of old systems. In order to avoid accidentally disconnecting the wrong power supply, it is necessary to match the correct safety device with the corresponding circuit

2042 cable detectors can also be used in this case. Connect the signal transmitter directly between the phase line and the zero line according to the formula (see Figure 3). In this case, the signal detection intensity will generally decrease. The AC voltage and the electric flux of the signal transmitter will affect each other. However, in this case, since the cable can be directly contacted at the open distribution box, the reduced tracking depth is not very important

Figure 3 - application example, the process of positioning the cable from the circuit positioning safety device without turning off the system

in order to successfully locate the cable in this type of application, the principle of this working mode must be understood theoretically. Take a covered socket as an example. In this case, the lighting socket is often the only place where the cable can be contacted. From the socket, the signal of the transmitter is sent to the cable

the connection mode of the transmitter is described in the above application without voltage. The grounding point of the nearby socket or extension line is used for grounding. Now, track the corresponding cable until the signal is not received. The operator can manually adjust the sensitivity of the receiver. According to the depth of installation in the wall, the sensitivity on the receiver must be increased or reduced. Once the signal is received, the receiver will display the letter "F" and the strength of the received signal

in addition, three different transmission strengths can be set on the signal transmitter. In this way, the group with the largest △ vs value is the low precision group. Track the cable until it reaches the end and locate it to the corresponding junction box or switch box. Good grounding of the transmitter output signal is very important for voltage free applications. The signal should not be received on the cable connected to the ground

example of locating the broken part of the cable

if the transmitter is connected to one end of the cable to locate the breakpoint, sometimes it can only roughly locate the location of the breakpoint due to the interference of the magnetic field. In this case, it is helpful to use another transmitter with different signal coding

for shielded cables, such as overhead cables, the signal will be displayed on the screen. Knowing the condition of the building structure in advance will also help in this process. The reinforcement in hard concrete also has a negative impact on the tracking signal

reinforced concrete is likely to play the role of grounding shield and will not receive signals. It is recommended that the known system be actually tested before the first field operation. This is the best way for users to be familiar with the working mode of the instrument. Using a special cable detector to locate cables has many advantages in field testing. Using trial and error to locate the cable, such as penetrating the wall, will damage the structure of the building and the cable itself. The new fluke-2042 cable detector provides help in all aspects of daily life

locate cable breakpoints

use additional signal transmitters to accurately locate cable breakpoints

locate faults in electric floor heating

a very attractive application is to locate faults in electric floor heating. For example, when the floor heating has just been laid, it cannot work normally. A common cause of this failure is that the floor with floor heating is inadvertently cut or damaged. For a heater with a protective layer, it is very important to see the transmitted signal on the screen

locate faults in electric floor heating

track underground cables and pipelines

use fluke-2042 cable detector to track buried cables. This function is very useful when dealing with external lighting systems. The maximum detection depth of this application type is 2.5m

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