Flashlight for electricity meter. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Electric meters
Comments on the article
The proposed device generates control pulses of the same duration, which allows you to quickly and accurately work with an EMP electricity meter. The device has been tested in practice and showed good results.
The “old” electromechanical electricity meters are increasingly being replaced by modern electronic multifunctional meters, which have an undeniable advantage over the first ones. Working with such devices requires certain skills and additional service devices.
Active electric energy meter of Lithuanian-German production EMP is designed for single-tariff or multi-tariff metering, processing and storage of information about incoming or outgoing electric energy in three-phase AC circuits. The meter is used in energy, industry, transport, agriculture and household enterprises, and can also be used in automated electrical energy metering systems.
To work with the LCD indicator of the meter (call, view, read data) is a photo sensor located on the front panel of the meter. To find the necessary data, according to the passport algorithms of the counter [1], its photosensor must be affected by long light pulses (>2 s) and short ones (<0,5 s). To do this, they use an ordinary flashlight, but, as practice shows, this method of reading data is not entirely convenient, even if the flashlight has a push-button switch. Due to the different durations of the control pulses, subprograms “jump” occurs - the reading procedure has to be repeated several times.
The circuit diagram of the device consists of two identical pulse shapers on the leading edge of the input signal based on a differentiating RC chain, described in detail in [2].
When you press one of the buttons S1 or S2 at the outputs of the elements DD1.1 and DD1.2, negative pulses are formed depending on the ratings of the elements R2, C1 and R4, C2. Through the IC DD1.3, the generated pulses are fed to the transistor VT1, the load of which is a small-sized light bulb EL1. There is no switch in the circuit, since the device consumes very little current in standby mode.
Details. The device uses a K561 series chip, but K1561 can be used, instead of K561TL1, you can use K561LA7. Capacitors should be as low as possible TKE. Buttons SI, S2 type MP-9, MP-10. Small-sized 1 V EL9 light bulb imported (Chinese).
Adjustment. A properly assembled circuit starts working immediately. After turning on the power, the required duration of the pulses of stable operation of the counter is set: by acting with a “flashlight” directly on the photocell of the counter, the value of the resistors R2 and R4 is changed.
The design is assembled in any convenient case (in the author's version - a plastic box with dimensions of 80x60x30 mm).
Literature
- EMR active electric energy meter. User manual.
- Shelestov I.P. Radio amateurs: Useful schemes. Book 2. - M.: Solon, 2001.
Author: A.A.Tatarenko, Kyiv
See other articles Section Electric meters.
<< Back
Latest news of science and technology, new electronics:
Traffic noise delays the growth of chicks
06.05.2024
The sounds that surround us in modern cities are becoming increasingly piercing. However, few people think about how this noise affects the animal world, especially such delicate creatures as chicks that have not yet hatched from their eggs. Recent research is shedding light on this issue, indicating serious consequences for their development and survival. Scientists have found that exposure of zebra diamondback chicks to traffic noise can cause serious disruption to their development. Experiments have shown that noise pollution can significantly delay their hatching, and those chicks that do emerge face a number of health-promoting problems. The researchers also found that the negative effects of noise pollution extend into the adult birds. Reduced chances of reproduction and decreased fertility indicate the long-term effects that traffic noise has on wildlife. The study results highlight the need ... >>
Wireless speaker Samsung Music Frame HW-LS60D
06.05.2024
In the world of modern audio technology, manufacturers strive not only for impeccable sound quality, but also for combining functionality with aesthetics. One of the latest innovative steps in this direction is the new Samsung Music Frame HW-LS60D wireless speaker system, presented at the 2024 World of Samsung event. The Samsung HW-LS60D is more than just a speaker system, it's the art of frame-style sound. The combination of a 6-speaker system with Dolby Atmos support and a stylish photo frame design makes this product the perfect addition to any interior. The new Samsung Music Frame features advanced technologies including Adaptive Audio that delivers clear dialogue at any volume level, and automatic room optimization for rich audio reproduction. With support for Spotify, Tidal Hi-Fi and Bluetooth 5.2 connections, as well as smart assistant integration, this speaker is ready to satisfy your ... >>
A New Way to Control and Manipulate Optical Signals
05.05.2024
The modern world of science and technology is developing rapidly, and every day new methods and technologies appear that open up new prospects for us in various fields. One such innovation is the development by German scientists of a new way to control optical signals, which could lead to significant progress in the field of photonics. Recent research has allowed German scientists to create a tunable waveplate inside a fused silica waveguide. This method, based on the use of a liquid crystal layer, allows one to effectively change the polarization of light passing through a waveguide. This technological breakthrough opens up new prospects for the development of compact and efficient photonic devices capable of processing large volumes of data. The electro-optical control of polarization provided by the new method could provide the basis for a new class of integrated photonic devices. This opens up great opportunities for ... >>
| Random news from the Archive New water state discovered
26.09.2020
Supercooled water is two liquids in one. American researchers came to this conclusion after conducting the first-ever measurements of liquid water at temperatures well below its usual freezing point.
Despite the extremely wide distribution, water as a chemical substance is still not fully understood. Scientists sometimes call it the most mysterious substance on Earth.
The fact is that water is not like other liquids - when it freezes, it expands, and does not shrink, like everyone else, its density decreases. Therefore, water ice does not sink, but floats on the surface. Water has a high boiling point and is an excellent solvent, therefore, under various conditions, most organic and inorganic substances dissolve in it. And finally, it has a huge coefficient of surface tension. Thanks to all these unique properties, water has become the basis of life on Earth.
Water has another interesting quality - it freezes very "reluctantly". If other liquids begin to solidify gradually, immediately after they pass the freezing point, then water "resists" to the last. And to start hardening, it always needs crystallization nuclei - suspended particles of mineral or organic origin.
Researchers from the Pacific Northwest National Laboratory (PNNL) of the US Department of Energy decided to test, if there are no such particles, up to what temperature the water will remain liquid.
It is known that water can be present in clouds in the form of supercooled drops even at very low temperatures, and then, when fine ice dust gets into these clouds from above, from higher and colder layers, the drops instantly crystallize and fall to the ground in the form of ice pellets. or hail.
Scientists in the laboratory destroyed a thin ice film with a laser, creating supercooled liquid water, and then, using infrared spectroscopy, tracked all the smallest stages of its transformations in the temperature range from 135 to 245 kelvins - from minus 138 to minus 28 degrees Celsius.
On freeze-frames of the phase states, the scientists saw that when supercooled, water condenses into a dense liquid phase, which continues to coexist with the normal liquid phase. At the same time, the proportion of liquid with high density decreases rapidly as the temperature rises from 190 to 245 Kelvin.
|
Other interesting news:
▪ Habits change the brain
▪ Samsung 4GB DDR64 RDIMMs
▪ Created a flexible organic battery
▪ Luminous Carpet - a smart guide in space
▪ Miracle laptop with 6,8 GHz processor 1 TB RAM
News feed of science and technology, new electronics
Interesting materials of the Free Technical Library:
▪ section of the site Power supply. Article selection
▪ article How does anyone bake pancakes. Popular expression
▪ What are the features of feudal fragmentation in Germany in the XNUMXth-XNUMXth centuries? Detailed answer
▪ article Vice-rector for educational activities and social issues of a higher educational institution. Job description
▪ article Increasing the efficiency of flash lamps. Encyclopedia of radio electronics and electrical engineering
▪ article Thread and paper. Focus Secret
Leave your comment on this article:
All languages of this page
Home page | Library | Articles | Website map | Site Reviews
www.diagram.com.ua
2000-2024
Arabic
Bengali
Chinese
English
French
German
Hebrew
Hindi
Italian
Japanese
Korean
Malay
Polish
Portuguese
Spanish
Turkish
Ukrainian
Vietnamese