The balance shows an incorrect weight. Repair of electronic floor scales. Positive qualities of digital models

To eliminate the problem, you should slightly raise the board and press it firmly against the display. This manipulation is carried out using a wooden bar, which is installed between the element and the body.

• Displaying erroneous information on the monitor... Determination of inaccurate weight occurs, often with thinning of the contact ends of the device. The malfunction is eliminated by replacing the corresponding relay in the mechanism device.

Remember, the contact ends of the equipment must fit snugly against the special supports of the electronic device.

• Clogged floor equipment... During the operation of the device, dust gradually settles on the internal elements of the structure. Such blockage, as a rule, renders the mechanism inoperative. To eliminate this problem, you should regularly clean the device using a dry towel.

Remember, water entering the operating mechanism can cause equipment damage.

Determination of inaccurate weight... Incorrect operation of the balance is often the result of improper calibration of the electronic device. To restore the exact settings, press the device button of the same name and hold it until the word "CAL" appears on the display. Typically, this process takes about 30 seconds. Then the display will show the numerical value of the weight, with which it is necessary to perform the calibration. Any object can be used as a reference. However, the exact weight must be indicated on it. Then the standard is placed on the balance and the word "PASS" is expected to appear on the screen. After completing the calibration, the obtained weight value is removed and the device is turned off.

In case of unsuccessful setup of the device, the display will show the inscription "FAIL". In this case, the procedure must be repeated.

• Malfunction of the mechanism... This failure often occurs as a result of overloading the device. That is why, before buying a device, it is important to determine the maximum permissible weighing rate, beyond which it is strictly forbidden to go beyond.

Otherwise, deformation of the load-bearing elements of the frame occurs. To restore the operability of the device, they should be straightened using a building level, a caliper or a special corner.

Remember, do not touch the display during troubleshooting. This element is located under a sealed glass and accidental penetration of air under the protective surface contributes to the violation of the polarization of the crystals. As a result, the screen turns black and streaks appear on it. For this reason, do not disassemble the fittings that fix the display.

As a rule, the restoration of the old parts or their replacement with new ones leads to the normalization of the functioning of the electronic mechanism.

Breakage of load cells

One of the most serious problems that occurs during the long-term operation of electronic structures is the breakdown of strain gauges.

Typically bathroom scales of this type equipped with a fixed platform and special supports, with the help of which the weight is measured. Under the legs of the device, there is a solid frame, which is made of a special alloy of metals. Due to the presence of this element, the frame bends during the operation of the device, and after the cessation of exposure, it returns to its original position.

Each frame is often equipped with a small plate that acts as the primary sensor assembly in an electronic product.

The sensitive strip, as a rule, is imprinted into the frame and covered with a special glue (compound). Three wires are connected to it, which provide measurement of the resistance of the bridge.

During the operation of the device, the four frames are bent at the corners and the excess load is redistributed. The electronic device automatically sums up all readings and displays the result on the scoreboard using a printed circuit board.

Remember, during operation, the frame of the floor-standing device is easily destroyed when exposed to a weight that exceeds the permissible parameters for this equipment. As a rule, in this case, the curvature of the load-bearing elements of the frame occurs.

To eliminate such deformation, straightening the frame will help. However, if there is no damage during visual inspection, then a special device, an ohmmeter, should be used to identify the malfunction. To do this, each sensor is carefully unsoldered from the board and the resistances between the three electrical wires are measured. If the device is in good condition, this indicator in the four corners is the same weight.

In case of wire breakage, the tester will show a different resistance value. If a problem is found, carefully clean the compound from the sensing plate.

There are times when three wires soldered to the plate are torn off. If a malfunction is detected, electrical connections are restored using soldering equipment. As a rule, this procedure allows you to resume the full functioning of the weight structure. However, in some cases, the device does not work due to a malfunction in the resistance sensor. In this case, replace the unusable mechanism.

Remember, any mechanical damage to the sensor part often leads to the failure of the entire structural unit.

Before purchasing a bathroom scale, you should carefully study the features of the operation and specifications device.

When choosing an electronic device, the following nuances and recommendations should be considered.

Weight measuring system... Typically, European manufacturers measure a person's weight in pounds.

Remember, your bathroom scale must be measured in metric.

Body material... When choosing a device, preference should be given to models with a metal base. Products made of plastic are usually short-lived and quickly lose their original shape.

Stability of the device... When purchasing a bathroom scale, you should check that there are mechanisms that allow you to install the equipment on an uneven surface.

Check the accuracy of the balance... For this purpose, it is necessary to put the packaged goods on the device or compare its weight on different devices.

Choose the right machinery layout... The balance sensor mechanism may be affected by electromagnetic radiation from nearby radio equipment or other powerful devices. Therefore, to determine the exact weight, the device should be located away from these units.

Remember timely Maintenance electronic scales will help to minimize the likelihood of breakdowns during the operation of this equipment.

If a malfunction is detected, remedial action must be taken immediately. However, if it was not possible to eliminate the problem on your own, you need to contact the service center for help.

Regular maintenance of electronic scales good quality will be the key to stable and uninterrupted operation of this device

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If a question is raised about the calibration of jewelry scales, then there is a need. In other words, there is no longer any confidence in the measurement results of your mini scales, which were previously so accurate. Let us examine the reasons why this happens and when it is worth carrying out this, in principle, a simple procedure.

When to calibrate

Algorithm

As we said, we get a set of reference weights. We have one. Some of the milligram plates have been lost, but the basic calibration weights (100,200,500 g) are available. And we use small ones to check the accuracy after the procedure.

Let's take a look at the calibration using the MH-500 as an example.

1. Press and hold the UNIT key in this state.
2. We are waiting until the numbers appear on the screen: 500.0. This is a calibration weight, the device itself "prompts" which weight to supply.
3. Press the same button again.
4. We watch the letters CAL blink, and then again 500.0.
5. Considering the above, after all, half a kilogram, we put the weight exactly in the center and carefully.
6. The device turns off, then turns on the power again /
7. An inscription will appear: "PASS", shutdown again and the process is completed.

What's the point?

From a technical point of view, the force of pressure and the weight of a kettlebell are compared. In uncalibrated scales, "confusion and wobbling" is observed ➢ even if the exact weight of 200 or 500 grams is set on the plane, the sensor "does not know" about it, no one "taught" it. The same will be an inaccurate result. And our analogy makes sense.

☝ Calibration is "teaching" or adjusting to a reference weight.

Is one weight sufficient for calibration?

Almost always YES. But on sale there are scales, for example, at the limit of 600 g, which are calibrated with two weights.

And it depends on two factors: the width of the measurement range and the accuracy requirements.

The wider the measurement limit and the stricter the requirements for low error, the more likely it is that more than one weight will be needed. The point is that it is difficult to ensure the same deviation over the entire range. And a weight of 200 g calibrates the lower sub-range, and 500 grams - the upper one. Such is the metrological division of labor.

Electronic scales operate in different ways than mechanical ones. Ignoring the level of sophistication of the instruments, the ubiquitous underlying principle remains the same. The basis is the measurement of resistances of strain gauges. The craftsmen, conducting the repair of electronic floor scales, are carried out in a uniform manner. Professional knowledge of the principles of operation of the device will allow you not to be afraid to spoil the case by interference. The master will not touch on the key details.

Electronic filling

Electronic bathroom scales are composed of four fundamental elements:

1. Load cells.
2. Display.
3. Electronic printed circuit board.
4. Buttons.

The first thing to remember is that the display is out of our reach. If air penetrates under the sealed bag, the polarization of the crystals will be disturbed, the screen will turn ugly black, covered with stains. It is forbidden to touch screws, glue, fasteners holding the part.

The last element may not be present in simple models. The scales are touch-sensitive buttons, start the inspection with batteries. Tablet with an operating voltage of 3 volts.

Comment. Does the pulled out tablet work on another less powerful device? The fact does not mean that the power supply is sufficient for the household bathroom scale. Buy a new battery. When testing, supply the terminals with 3 volts DC with a suitable power supply, observe the response of the balance. Further repairs to the bathroom scale are advisable if the previous step is ineffective.

Visual inspection

Let's take a look at the scale first. The cover is unscrewed, a visual inspection of the device is performed. Research subject:

• quality of electrical connections, installation of the electronic board of the floor scales;
• integrity of parts, regardless of purpose.

The steps taken are sufficient to determine the nature of the problem. Solder the torn wires back, restore the damaged tracks of the electronic board. The place of the defect is cleaned with emery, degreased, tinned. A jumper is soldered on top, a solid layer of tin. It is advisable to cover the damaged area with a special varnish, suitable for nails (female).

The inner frames are bent, it can be seen: the scales were tested by an elephant weighing in excess of the maximum allowable model of the repaired model ... It is worth carefully aligning hardware to bring the parts back to their original shape. Use standard measuring instruments: building level, caliper, corner.

Mechanical damage leads to incorrect readings. Correction of parts of floor scales is completed with one hundred percent restoration of working capacity. When repairing the scales, work with a screwdriver, pliers. If visual inspection does not reveal any damage, we read the material further. A grain of theory will come in handy for understanding the principles of operation of floor scales, creating an idea of ​​\ u200b \ u200bthe repair method.

Load cells

Let's discard the well-known information about mechanical scales. The platform of the electronic counterparts is stationary. The measurement is taken by the legs. Hidden under each are durable frames of hard alloy, which deform when a person operates the scales.

Changes cannot be fixed with the eye, the difference is so small - not to be determined by the building level. Each frame has a tiny plate less than 2 centimeters across. The designated is the sensor assembly of the electronic scales. The part serves as the basis for floor and other models. Products differ in the way the strain gauge is mounted.

The sensing plate is firmly imprinted into the frame, sealed with a compound (glue). The sensor is powered by three wires that measure the resistance of the bridge arms. A person wants to know the weight of the body, tramples the platform, the four corner frames bend, dividing the excess weight in proportion to the lengths. The total readings are obtained by summing the numbers. The process is controlled by the printed circuit board of the scale: three wires run into each corner.

The measuring bridge is formed by a square, each side contains a resistor. One diagonal receives power, the other is the source of readings. Official sources are silent about the composition of the concept. Suppose two resistors have chosen the frame, the others - printed circuit board scales. Three wires ensure reliable electrical connection... A detailed explanation is given so that the reader understands that it is difficult to damage the balance sensors. Ordinary glands, destroyed exclusively by mechanical means. Resists moisture (but not PCB).

The load cell is broken

The scale model is characterized by the maximum weight of the installed load (human body, weights), the limit cannot be exceeded - you will bend the power elements of the frame. It is enough to straighten the iron, restoring working capacity, as mentioned above.

Let's say the bathroom scales are visually in order. The tester will help you identify the problem. Each sensor is carefully soldered from the board, the resistances between the three wires are measured. The result should be the same at the four corners of the scale. If a gap is observed, the problem has been found.

It is recommended to carefully pry open the glue (compound) covering the sensing plate. Mechanical damage to the part will instantly cause complete rejection node. A copper-colored plate will be found inside: three wires are soldered here. Rarely, but it happens, one is torn off. Re-establish the electrical connection, the scale will be operational again.

Once you find a dead sensor, find (buy) a similar one. Repair of kitchen scales will not be difficult: you will find a large number of load cell models on sale. If the component is purchased, there is a calibration problem. Special equipment is required, it is practically difficult to find a third-party sensor that demonstrates similar parameters. Your bathroom scale can lie a lot.

Calibration, purpose

The load cell is unique, there is no copy in the Universe, even if two compared products leave the conveyor as an inseparable pair. When making measurements, bridge connections will always give an error, the calibration is designed to eliminate the negative phenomenon. Let's note the trick. Since the total weight is calculated by summation, if the only sensor of the floor scale is faulty, the broken leg can be excluded from the process. We offer two options for action:

• simply release the faulty leg from the load;
• or simulate the desired zero load values ​​with ohmic resistors.

The first works if the sensor is lying, incorrectly calibrated. The second (see the list) is done with ease, because the resistances were previously measured. It remains to connect according to the diagram and carefully put it inside the case. The faulty sensor is disconnected, continuing to play the role of an ordinary leg. The totalizers will count the leg weight as zero.

Some models will allow you to manually calibrate, typical of professional models, which is rarely found in everyday life. After excavating a similar broken specimen, remove the necessary parts.

It is important to understand: repairing floor scales with your own hands requires ordinary ingenuity. A smart device is a bunch of resistors plus a microscopic electronic board.

Biological parameters

The latest novelties show body weight, fractional composition of human tissues:

• muscular;
• subcutaneous fat;
• bones;
• water;
• visceral fat.

The first four parameters are needed by athletes who make up training methods, the last indicator characterizes the deposits that cover the internal organs... Harmful fats that contribute to disease. Smart bathroom scales tell you about current values parameter, they will recommend the calorie content of the daily diet to achieve the healing effect. Moreover, the level of actual physical activity is not important. The parameter is set by special commands, changing the final size of the calorie content of the food.

A wonderful bathroom scale looks amazing. Much easier than the human imagination imagines.

Biometric scales

Various home bathroom scales are distinguished by electronic filling. Models that determine the biometric parameters of the body, a set of resistors, microcircuits. The devices are no different from the simplest Chinese pink bathroom scales for teenage girls.

What about biological parameters? Calculates the microcircuit, guided by a priori information entered by the user according to the manual. Mathematical operations are carried out by the built-in controller, which collects the readings of the load cells. It is unnecessary to be afraid of bathroom scales, no matter how difficult it may seem.

Conclusion

Avoid repairing household electronic floor scales that are under warranty. Not Washer, but expensive models, decorated in a proper order, are repaired by professionals.

Severe cases are handled by private firms. They restore the functionality of electronic scales. The activities are accompanied by calibration. Another option for troubleshooting. Taring is a scientific word that is alien to the hearing of most citizens. The meaning of the process is limited to the correlation of the physical states of the sensor with numbers.

The coming age of microcontrollers makes it hypothetically possible for ordinary citizens to create smart devices. The unique information of the Internet broadens the horizons, helping to master unfamiliar professions. Programming algorithms requires a special mindset. You can train everywhere: shop, logistics of your own movements, mental calculations. Professionals discourage outside interference. The foundations of science are transmitted by a narrow circle of people. The Internet is helping to change aging traditions.

Almost every person has floor scales. People want to constantly monitor changes in body weight. But very often it happens that the floor electronic balance show different meanings with regular use. This can happen for several reasons. Firstly, the device may be a fake, because of this it will show inaccurate readings. The second factor is surface roughness. The third reason is that the definitions are made in different places. This is why the scale does not show the weight correctly.

How to distinguish electronic from mechanical models

The main difference between mechanical and digital devices is the presence of a measuring scale with an arrow. Their design consists of a main body and a scale under the glass. They are connected to each other thanks to a transmission mechanism consisting of rocker arms and shoulders.

Mechanical models do not have high accuracy, and their discreteness is ± 1 kg. Electronic devices show more accurate numbers. Their scale clearly displays the value not only in kg, but also in grams. On conventional devices, grams are very difficult to see. Therefore, modern models have a discreteness lower in the range from 100 to 500 grams.

The transfer device of the instruments gives out a change in the spring, therefore it displays on a scale the load carried out on them. It is necessary to use such models on an ideal flat surface in order to reduce the percentage of error.

On modern devices, instead of a scale, there is a display that highlights the mass. Their measurement principle is based on the sum of the readings of all sensors with high sensitivity, they are located at the corners of the equipment body. They read how pressure is applied to the platform.

Selection guide

When buying, you should carefully study the main characteristics. First, you need to determine the frequency with which the use is planned, in what conditions the operation will take place, the possible percentage of error. It is best to buy models from well-known manufacturers in this industry.

Renowned manufacturers of reliable mechanical scales:

• Medisana 40461 PSD

• Scarlett SC-BSD33M952

• Maxwell MW-2656

Well-known manufacturers of reliable electronic devices:

• Beurer GS 27

• Starwind SSP5452

• Redmond RS-719PK

The advantages of mechanical devices:

• Long term of use;
• Easy to operate;
• High strength;
• Low price.

Disadvantages:

• Large error of indicators;
• Lack of additional functions;
• They have a limit in their work.

Positive qualities of digital models:

• They have great functionality;
• High accuracy and high measurement limit;
• Huge selection of models.

Negative sides:

• Great cost;
• Requires more careful maintenance;
• It is necessary to constantly replace the batteries or connect to the power supply network.

When choosing, pay attention to the fact that the sensors are built into all legs of the scales, in this case the indicators will be more accurate. Many buyers are often interested in whether the instruments may be giving the wrong readings. Despite all the advantages, the devices still show the wrong body weight. There can be many reasons for this: from improper installation to device breakdown.

Rules for care and use

To increase the service life, you must adhere to the following rules:

• Observe the humidity regime recommended in the instructions;
• Protect from mechanical damage;
• Take good care of all the details.

For a more accurate result when weighing, it is necessary to place the mechanism only on a flat surface. Measurements must be taken in the same constant location. Otherwise, the scales will lie. The legs on the scales should be placed parallel to each other so that the center of gravity is evenly distributed over the entire surface. When you are standing, you do not need to make unnecessary movements and bend over. If not, the balance shows an incorrect weight.

Highly frequent question: "Can the balance show a different value if used incorrectly?" Yes, they can, the conditions under which the device is stored and used are of no small importance.

If the bathroom scale is lying, then the main reasons are:

• Uneven surface;
• The person is standing incorrectly - the legs on the scales should be parallel to each other;
• Clogging of the inside;
• Thinning of the contact ends of the transmission mechanism has occurred;
• The magnetic field could have a profound effect on the sensors;
• Calibration setting failed.

Here are the main reasons why electronic scales show different weights incorrectly.

Very important! During operation, do not allow a sharp temperature drop in the room the environment... Under no circumstances should the balance be placed close to heating devices. Also, you cannot clean structural elements with chemically aggressive substances.

What should I do if the bathroom scale shows the wrong weight? The calibration settings may have failed. carried out according to the instructions of the instructions. Sometimes models have an automatic calibration function.

The easiest way to do the calibration is:

• Set the reference weight on the work surface;
• Press the power button until “PASS” appears;
• After the end of the process, the operating mode is restored by itself.

If the balance shows an incorrect weight, even after calibration, what should I do? In this case, it is necessary to check the accuracy of the readings. To do this, weigh yourself several times in a row and write down the results obtained. Then determine the difference between the highest and the lowest value. If the deviation is within 200 grams, then this is considered the norm.

Very important! There is no need to check the work with various foreign objects, such as: dumbbells, bags, canisters, etc. Because the device is designed to work with human parameters, and when measuring the mass of other objects, the pressure on the platform is not completely distributed and an error is obtained. Also, this method can break the device. This is why your bathroom scale can often produce incorrect data.

In the process of determining body weight, it is important to become correctly. After all, the result also depends on which part of the foot can be more pressure. If the force of the load is greater on the toes, then the weight indicator will be lower, and if the pressure is more on the heels, then the weight in this case will increase slightly. This explains well why electronic scales show different numbers.

When the word "error" is highlighted. In this case, you need to try to change the supply element and calibrate. It also means that a malfunction has occurred.

Then you need to wait a few minutes until the display shows zero values. If these actions did not bring desired result, then the problem is in the touch sensors, they are most likely out of order. Then you need to purchase a new device, because replacing sensors does not justify itself financially, and in frequent cases, repairs are simply impossible.

Conclusion

So that the floor scales do not give out a different value, they must be placed on a flat surface in the same place. Also, do not place them near heating devices and do not use when cleaning aggressive chemical substances... It is very important for the device that there is no high humidity, vibration or high temperatures in the room.

To get accurate results, it is important to stand on the floor correctly. We stand straight, feet on the platform are perpendicular, no need to bend over or make a lot of unnecessary movements. By following these simple rules, the balance will always show an accurate reading without unexpected malfunctions.

There are electronic scales for measuring their own weight in almost every home - people try to track changes in figure as much as possible in order to take timely measures. For this, they are weighed daily, but the values ​​on the scales may be different each time. In fact, this can be explained by physical changes - the normal functioning of the body. But when a person stands on the platform several times in a row and receives different meanings, this should alert. Next, we will consider in detail why electronic floor scales often show different weights.

A little about electronic varieties

Electronic floor device

Now there are only two types of weighing devices for any purpose: mechanical and electronic. Mechanical devices do not differ in high accuracy - manufacturers do not hide the fact that discreteness of up to one kilogram is permissible in such devices. This is not the case with electronic devices. You should also pay attention to.

Electronic diagnostic devices

The simplified electronic models have a built-in measuring spring, the results of which are displayed during weighing. More modern and improved models use a voltage sensor through which an electric current is passed. As soon as a person stands on the platform, the sensor is tensioned, and the generated electrical signal displays the changed data on the display. In such models, only electronics are used, the advantages include the ability to obtain additional information about the body.

Possible breakdowns

If the electronic floor scales show a different weight, most likely the device is broken. You can determine the type of breakdown by certain criteria:

The main problem that arises when using electronic scales is that the device shows different body weights.

What are the criteria, read in our article.

Why is there a different weight on the display

Why electronic floor scales incorrectly show weight is a well-known problem and often arises due to minor errors in the operation of the device. The reasons may be as follows.