Power supply for multimeter M830. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Power Supplies
Comments on the article
The M830 series multimeters require a 9V supply (6F22 battery or similar) to function properly. The multimeter works fine when the voltage drops to 7,5 V. However, when the voltage drops below this value, the measurement accuracy decreases, and at a voltage of less than 6 V, the multimeter is no longer able to measure.
To accurately measure parameters with a multimeter, the supply voltage must be constant.
To do this, I propose to use well-known SEPIC microcircuits, for example, from Linear Technology. Figure 1 shows the voltage converter circuit recommended by the company for the LT1308 chip.
The device is made on a printed circuit board with dimensions of 10x10 mm (Fig. 2).
The pinout of the LT1308 chip and its dimensions are shown in Fig.3.
The choice of the microcircuit is due to the fact that it makes it possible to obtain the required voltage (9 V) from one lithium-ion battery during its entire "life". Even when the battery voltage drops to 1 V, the microcircuit is able to "pull out" about 9 V at the output of the circuit.
In this circuit, you can also use NiMH or LiON batteries of standard size, AA of any capacity. Such batteries, together with the power circuit, are freely placed in the battery compartment of the multimeter. In this case, the batteries can be charged repeatedly.
Author: P. Bobonich, Uzhgorod, Ukraine
See other articles Section Power Supplies.
Read and write useful comments on this article.
<< Back
Latest news of science and technology, new electronics:
Machine for thinning flowers in gardens
02.05.2024
In modern agriculture, technological progress is developing aimed at increasing the efficiency of plant care processes. The innovative Florix flower thinning machine was presented in Italy, designed to optimize the harvesting stage. This tool is equipped with mobile arms, allowing it to be easily adapted to the needs of the garden. The operator can adjust the speed of the thin wires by controlling them from the tractor cab using a joystick. This approach significantly increases the efficiency of the flower thinning process, providing the possibility of individual adjustment to the specific conditions of the garden, as well as the variety and type of fruit grown in it. After testing the Florix machine for two years on various types of fruit, the results were very encouraging. Farmers such as Filiberto Montanari, who has used a Florix machine for several years, have reported a significant reduction in the time and labor required to thin flowers.
... >>
Advanced Infrared Microscope
02.05.2024
Microscopes play an important role in scientific research, allowing scientists to delve into structures and processes invisible to the eye. However, various microscopy methods have their limitations, and among them was the limitation of resolution when using the infrared range. But the latest achievements of Japanese researchers from the University of Tokyo open up new prospects for studying the microworld. Scientists from the University of Tokyo have unveiled a new microscope that will revolutionize the capabilities of infrared microscopy. This advanced instrument allows you to see the internal structures of living bacteria with amazing clarity on the nanometer scale. Typically, mid-infrared microscopes are limited by low resolution, but the latest development from Japanese researchers overcomes these limitations. According to scientists, the developed microscope allows creating images with a resolution of up to 120 nanometers, which is 30 times higher than the resolution of traditional microscopes. ... >>
Air trap for insects
01.05.2024
Agriculture is one of the key sectors of the economy, and pest control is an integral part of this process. A team of scientists from the Indian Council of Agricultural Research-Central Potato Research Institute (ICAR-CPRI), Shimla, has come up with an innovative solution to this problem - a wind-powered insect air trap. This device addresses the shortcomings of traditional pest control methods by providing real-time insect population data. The trap is powered entirely by wind energy, making it an environmentally friendly solution that requires no power. Its unique design allows monitoring of both harmful and beneficial insects, providing a complete overview of the population in any agricultural area. “By assessing target pests at the right time, we can take necessary measures to control both pests and diseases,” says Kapil ... >>
| Random news from the Archive Sensitive dark matter detector
16.07.2022
The world's most sensitive dark matter detector has begun scientific work after passing tests for 60 days. The facility is located at a depth of 1,5 km at the Sanford Underground Research Center in Lead, South Dakota. The sensitivity of the instrument is estimated to be 50 times higher than that of the previous setup. The device will collect event data for at least 1000 days without any guarantee of a result.
When searching for dark matter, even a negative result is a step forward. The search in a certain range of masses and energies forces us to correct the physical model of this hypothetical particle, which has set the very foundation of our Universe. It is particles, that is why it is correct to change the tracing paper from the English "dark matter" in Russian to "dark matter". Matter can also be a field, this is a broader concept, and a particle, nevertheless, is a substance.
The new LUX-ZEPLIN (LZ) experiment builds on the previous two, LUX and ZEPLIN, but is presented on a larger scale. So, if in the previous experiment 360 kg of liquid xenon was used to search for events (collisions of ordinary and dark matter), now the reservoir contains 7,7 tons of liquid xenon cooled to cryogenic temperatures. Also, the container was replenished with new sensors, even two types of sensors: one for detecting flashes from the interaction of dark matter with xenon atoms and the other for detecting electrons knocked out by such a collision.
Around the tank with xenon there is a tank with ordinary water and sensors for registering particles known to science. Such an organization makes it possible to register events simultaneously in xenon and in water. And if the events occurred simultaneously, then this allows us to immediately exclude dark matter, which on a given scale does not interact with water atoms in any way. The relatively large installation depth and the water screen make it possible to significantly reduce noise - the detection of particles of ordinary matter.
In test mode, the installation worked for 60 days after the launch in December 2021. An article was published as a result of the check. Now the device will collect data for at least 1000 days in the hope of registering a collision of a dark matter particle with a xenon atom, which occurs with a theoretical probability no more than twice a year.
In the LUX-ZEPLIN experiment, scientists are looking for a WIMP (Weakly Interacting Massive Particle) particle, a hypothetical weakly interacting massive particle. "WIMPs" interact with atoms of ordinary matter only with the help of gravity or weak interactions. Increasing the overall sensitivity of the installation up to 50 times gives hope that, nevertheless, something will get into the network of scientists.
|
Other interesting news:
▪ Dead Sea Manuscripts
▪ FingerReader - text reader
▪ Topological insulators - the basis of lasers
▪ impure blood
▪ Lonely and unhappy people age faster than smokers
News feed of science and technology, new electronics
Interesting materials of the Free Technical Library:
▪ site section Welding equipment. Article selection
▪ article Panel shower. Tips for the home master
▪ article Which inscription on the packaging of vegetable oil is meaningless? Detailed answer
▪ Rocambole article. Legends, cultivation, methods of application
▪ article Digital scale - frequency meter. Encyclopedia of radio electronics and electrical engineering
▪ article Schottky diodes of the KDSh2964 series. Encyclopedia of radio electronics and electrical engineering
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