The cable measuring device for automatic documentation of cable cutting and cable lengths.
With the Aufmaster AM1 cable length measuring device, you automate the documentation of your cable measurements and reliably determine cable lengths – quickly, precisely and completely digitally.
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Interesting facts about cable length measuring devices.
01 How can I measure the cable length?
To measure the length of a cable, a cable length measuring device can be used. There are several types of cable length measuring devices that use different methods to determine length. A mechanical cable length measuring device counts the revolutions of the cable as it is passed through it. An electronic or digital cable length measuring device captures electrical or optical signals to calculate the length and show it on a display. The choice of method depends on various factors, such as the type of cable and desired accuracy.
Other ways to measure or calculate cable lengths include the meter stick, folding ruler or folding rule, a mathematical calculation (diameter of the cable ring * pi (π) * cable rings) or weighing the cable.
With the Aufmaster AM1 cable length measuring device and the free app, you can measure the length of cables without much effort.
02 What is a cable length measuring device?
A cable length measuring device is an electronic device used to measure cable lengths. It helps determine how long a cable is without actually having to unroll or measure it by hand. It is often used in fields such as electrical engineering, telecommunications, network installation and home wiring. Basically, anywhere you need to check the length and condition of cables.
03 What is a cable length measuring device used for?
A cable length measuring device can be used to diagnose problems in cables, such as short circuits, breaks or improperly connected wires. It allows technicians and installers to work more efficiently and accurately by determining cable length or locating wires in walls or under the floor without having to physically access them.
The Aufmaster AM1 cable length measuring device documents cable cuts or measures cable lengths in our free app. No more time-consuming documentation by paper and pen on the construction site or in the warehouse.
04 Cable length measuring device electronic, digital or mechanical - what is the difference?
An electronic cable length measuring device, also known as a digital cable length measuring device, and a mechanical cable length measuring device are different types of devices used to measure the length of cables. The main difference is in the way the measurements are made and displayed.
A mechanical cable length measuring device uses mechanical components such as rollers or wheels to guide the cable during measurement. The cable is manually fed through the device, and the rollers or wheels count the revolutions to determine the length of the cable. The measurement is made based on the mechanical movement of the components. The results are usually displayed on an analog scale or counter.
An electronic or digital cable length measuring device, on the other hand, uses electronic sensors or technologies to measure cable length. It detects the electrical or optical signals reflected or passed by the cable and calculates the length based on those signals. The measurements are processed electronically and displayed on a digital display. The device can also provide additional functions, such as storing measurement data or calculating average values. The Aufmaster AM1 cable length measuring device documents all measured values in a free Aufmaß App.
The main advantage of electronic or digital cable length measuring devices is their precision and accuracy. They often offer higher measurement accuracy and can also provide advanced features for analyzing and managing measurement data. Mechanical cable length measuring devices are typically simpler and less expensive, but are less accurate and may have limited features.
The choice between an electronic, digital, or mechanical cable length measuring device depends on your specific requirements, desired accuracy, budget, and additional features you need.
05 Are there different purposes and applications of cable length measuring devices?
Yes, there are. There are numerous manufacturers who have developed cable length measuring devices for different purposes and applications. For example, some devices may be specifically designed to measure coaxial cables, Ethernet cables or power lines. The exact functions and features may vary by manufacturer and model.
The Aufmaster AM1 cable length measuring device can basically measure any cable with at least two wires up to a cable cross section of 16mm2.
06 What are the measuring principles of electronic cable length measuring devices?
The best known measuring principles of cable length measuring devices are the capacitive method and the reflection method.
The capacitive method in a cable length measuring device is based on using the capacitance coefficient of an electrically conductive cable to determine the length of the cable. Each cable has a specific capacitance coefficient due to its material and cross-section, which is usually specified by the manufacturer and must be set in the measuring device. To measure the length of the cable, the measuring device is connected to both ends of the cable. The total capacitance of the cable is measured. Then, this total capacitance is divided by the capacitance coefficient of the specific cable type. The measurement of capacitance is based on the fact that each cable has a certain amount of capacitance due to the insulating materials between the electrical conductors. Voltage applied to the cable causes charges to build up, and the capacitance of the cable affects the flow of charge. The measuring device detects the capacitance of the cable and uses the capacitance coefficient to calculate the length of the cable. The capacitive method is typically used when both ends of the cable are accessible, as the measuring device must be connected at both the beginning and the end to provide accurate results. It is important to note that the capacitive method has its limitations. It works best with single-core cables or cables with insulated conductors, as capacitance is easier to measure in these cases. With multi-conductor cables, the capacitive method can be less accurate because interference between the conductors can affect the measurement.
The reflection method in a cable length measuring device is based on the evaluation of reflected electrical signals to determine the length of a cable. In this method, a short electrical pulse is injected at one end of the cable. This pulse propagates along the cable and encounters any changes such as a cable break, a line break or a connection point. At these points, a portion of the signal is reflected and returns to the measuring device. The cable length measuring device detects and analyzes the reflected signals to provide information about the location and nature of the changes in the cable. By measuring the time the pulse takes to return to the measuring device (TDR – Time Domain Reflectometry), the distance to the point of change can be calculated. Knowing the propagation speed of the signal in the cable, the total length of the cable can be estimated. The reflectometry method also allows multiple cables to be distinguished when they are connected, since each cable has a unique reflectance. This is useful, for example, to help assign cables in complex cabling systems. It is important to note that the reflection method has its limitations. It works best for cables with sufficient signal reflection, which is the case for cables with high impedance or where there are changes in the cable such as ends, terminations, or branches. The measurement may be less accurate for cables with low impedance or where signals are heavily attenuated.
07 What is the role of the velocity factor in a cable length measuring device?
The velocity factor in the reflection method stands for the ratio of the propagation speed of electromagnetic waves in a cable to the speed of light. The speed of propagation of electromagnetic waves in a cable is usually given in relation to the speed of light. The speed of light is approximately 299,792 kilometers per second. The velocity factor is used to calculate the actual propagation speed of the signals in the cable. If a velocity factor of 1 or 100 percent is specified, it means that the electromagnetic waves propagate at the speed of light in the cable.
For example, if a velocity factor of 0.80 is specified or determined, it means that the electromagnetic waves propagate in the cable at a speed of 0.80 * 299,792 kilometers per second, or 239,834 kilometers per second. The velocity factor is important for making accurate length measurements using the reflection method. By taking into account the actual propagation speed of the signals, the measurement accuracy can be improved. The velocity factor varies depending on the cable type and can be specified by the manufacturer or determined experimentally.