Technical characteristics of microwave ovens

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Do not buy microwaves for cooking. In the Hague court justified the scientist, who proved the harmfulness of products, the properties of microwave waves are recommended to further study. Food for babies do not heat up inside. The rest of the microwave will become an indispensable tool. Remember, if a lot of fat gets on the mica plate, you get fireworks. Which microwave is better to buy?

Safety of the microwave oven

The characteristics of household appliances are strictly standardized. Everywhere reigns Rospotrebnadzor. For residential premises conditions are tightened. Not allowed to make noise more than 68 dB.Hair dryers, vacuum cleaners, washing machines in the spin mode jump threshold. The first norm is laid down in the laws issued by medical institutions, the second is spelled out in the standard. From 9.00 to 19.00 it is permissible to work with perforators.

Safety Instructions

Let's start with the electromagnetic radiation factor. The power flux density at a distance of half a meter from a microwave oven does not exceed 10 μW / cm2.Measurements are carried out with a loaded compartment.

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How to measure a parameter to assess the safety of a microwave oven? The forums are full of descriptions of special devices, most of these curiosities are not at home. But most boast a gadget that supports WiFi. Mentioned in the reviews utility Inssider, scanning the network, showing the signal level. Let's try using the software to estimate the attenuation given by the body of the microwave oven.

Ideally, create a pair of two laptops using standard Windows tools. If there is no built-in modem, use an external one. The driver will have to be installed. The signal level is measured in dB.Let us estimate the approximate attenuation from the body. It should be understood how much W absorbs water when heated. It is proposed to put inside a vessel with a liter of liquid. The temperature is measured before and after the experiment, according to the clock we determine the time. For example, in 10 minutes a liter began to boil.

Knowing that the specific heat capacity of water is 4200 J / kg ºС and assuming that the initial temperature of the liquid was 10 degrees, and the mode of the microwave oven was maximum, we get the power:

N = 4200 x( 100 - 10) / 600 = 630 W.

This is the heat loss. The rest of the energy is dissipated. The grill does not participate, only the magnetron works. Assume: the power rating of the microwave generator is 1.2 kW.Determine the flow of power through a ball with a diameter of 70 cm( 50 cm according to the standards mentioned above, 20 cm of margin on the dimensions of the device).It turns out: without the walls would emit out 570 watts. Find the stream for this value.

Calculate the area of ​​the ball:

S = 4 П R2 = 6.15 square meters.meters. We divide the total power loss by this value, we get 102.4 W / m. To convert to square centimeters divide the figure by 100x100( 10000).The output is 10.24 mW / cm2.This is a thousand times higher than normal. Therefore, each microwave oven has protection against switching on with the door open. Otherwise, the owners of the device would lose their health.1000 times will be 30 dB in power. On so much should fall signal.

WiFi 2.4 GHz works on the same frequency as the microwave. Turn on the device plug in the outlet, the magnetron is idle. A laptop works with an antenna. It is not enough to put an external antenna inside; most modems( laptops) are also endowed with a built-in one. USB extension can be used.

Microwave

It remains to determine the weakening of the network using the program. The experiment is conducted on an empty table, then a microwave oven is placed in the same place, inside of which the receiving part of the WiFi network is placed. Two digits become available which differ by 30 dB.

Boil one liter of water inside the microwave. Calculation of attenuation in dB is given above. Depending on the result, everyone will understand whether the device complies with the standards. If there is a factory instrument for measuring the power flux-density, the resulting figure will be compared with 10 μW / cm2.

The body of the microwave oven, when properly grounded, serves as a shield. Steel mesh on the glass door has no contact with the schematic ground. Such protection cannot be considered reliable. If the shield is not grounded, it reflects back half of the power( not counting the loss).It is important to properly connect the microwave to the mains.

Microwave Heating

Characteristics of microwave ovens

Consider the main parameters of microwave ovens:

  1. 600 watts enough to boil a liter of water. The volume of food is usually smaller, the temperature difference is lower. Example: get the food out of the fridge. Inside, the temperature was 5 degrees Celsius, we love the scalding soup( 50 degrees).At a cost of 600 watts to condition the plate will be brought in 2 minutes. The soup heats longer than other foods. Over the speed microwaves have gained popularity.
  2. The loading volume of the microwave oven is selected individually according to the parameters of home cookware. Typical depth is 4 cm. A typical soup plate is placed inside. Decide on the installation site. Be sure to want to buy a built-in microwave. Dimensions correspond to the compartment, it is useful to read the instructions in advance.

    Cooking food in the microwave

  3. There are proposals for inverter microwave ovens. Inverter microwave ovens to perfection far. The infrared sensor receives scant information, power generation is based on the assumption that food is 70 - 90 percent water. By adjusting the magnetron using an inverter, the microwave oven tries to heat the dish and avoid the smell of roast. Cooking time is increasing, customers complain.
  4. Service availability is important. Carefully fill out the warranty card, the store’s receipt only gives the right to service from the dealer. The plant often gives more favorable conditions. Service workshops for most brands have penetrated into distant corners of Russia. For a list, see the documentation. Exceptions are rare.
  5. Some microwave ovens are installed on the wall. It remains to buy a bracket for a microwave oven, get a punch. Not all models are suitable. Find out more in the store.

You can buy a dish for the microwave in the nearest workshop. Will order, bring the necessary accessory. Some microwave ovens are able to weigh food, independently calculate the duration of the cycle. Inverter models are more reliable, the temperature of the food is measured directly.

Interestingly: when the soup is heated in the oven, the plate goes hot, the liquid stays cool. The 2.4 GHz electromagnetic wave is absorbed at the interface between two media.

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