Digital multimeter M838. Electric scheme, description, characteristics. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Measuring technology
Comments on the article
Description
The M838 Digital Multimeter measures AC/DC current, resistance, AC/DC voltage, and bipolar transistor gain (h21). The quality of the connection of conductors or soldering can be checked using sound continuity. The built-in 1000 Hz sine wave generator will be useful when testing radio devices. Also, using the M838 multimeter, you can ring semiconductor diodes. The measurement results are displayed on a well-read digital 31/2-digit LCD display. The multimeter is powered by one 9V "Krona" battery. The M838 multimeter is supplied with a set of probes and instructions in Russian.
Features
Number of measurements per second: 2
DC voltage U= 0,1mV - 1000V
AC voltage U~ 0,1V - 750V
DC current I= 2mA - 10A
AC frequency range current 40 - 400Hz
Resistance R 0,1 ohm - 2 megohm
Input resistance R 1 MΩ
Temperature t°C -20° ? +1370°
Transistor gain h21 up to 1000
Diode test: yes
"ringing" mode < 1 kOhm
Power supply 9V / type NEDA 1604, Krona VTS /
Dimensions, mm 65? 125? 28
Weight, grams (with battery) 180
Service: Low battery indication
Overload indication "1"
Average price: 12-15$
Below is the M838 digital multimeter circuit
(click to enlarge)
Publication: cxem.net
See other articles Section Measuring technology.
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 Energy-saving solar-powered clothing
20.12.2023
With increasing temperatures on the planet and environmental challenges, people are faced not only with the need to adapt to a changing climate, but also to ensure biological safety in conditions of elevated temperatures. One innovative approach is the creation of solar-powered smart clothing, which scientists say can function as a personal air conditioner (or heater, if necessary).
Innovative technologies in the field of energy-saving clothing that use solar panels for thermoregulation are opening up new prospects for providing comfort in a changing climate. Systems developed by scientists that can regulate body temperature using solar energy provide an effective and convenient way to maintain biological safety in conditions of elevated temperatures. Further development and industrialization of such technologies could make them accessible to a wider range of consumers, reducing dependence on traditional temperature control methods and promoting resilience to climate change.
To ensure the comfort and safety of the human body, it is important to maintain a certain temperature regime. However, with the planet's rising temperatures and the cold regions at the poles, creating clothing that can regulate temperature has become essential. Scientists have developed an innovative thermoregulation system for clothing that combines an organic photovoltaic module and bidirectional electrocaloric devices to provide cooling or heating.
Both components are not only flexible and suitable for use in clothing, but are also powered by sunlight, eliminating the need for external power sources. The developed clothing is designed to expand the thermal comfort zone from 22° - 28°C to 12,5° - 37,6°C.
The efficiency of the device is sufficient to provide 24 hours of operation after 12 hours of charging in sunlight. In addition, it has a simple structure, compact design and can be integrated into existing clothing.
Perhaps the future will bring universal thermoregulation technologies that are not limited to just power supply, and can even support the operation of electronic devices in special conditions.
With the increase in temperature on the planet, clothing with cooling systems is becoming more and more in demand. Over the summer, reports emerged that global companies were providing cooling vests to their outdoor workers. New technologies also include vests with built-in water pumps, made from breathable fabrics, and even built-in fans.
|
Other interesting news:
▪ Refrigerator for quantum chips
▪ Juggler - intellectual specialty
▪ Iron transparent to gamma radiation
▪ Fitness tracker Moov NOW
▪ Monoblock computer Acer Aspire Z3-600
News feed of science and technology, new electronics
Interesting materials of the Free Technical Library:
▪ section of the site Radio - for beginners. Article selection
▪ article Ugly duckling. Popular expression
▪ article How did asphalt appear? Detailed answer
▪ article Interior guard. Standard instruction on labor protection
▪ article Canary Trill Simulator. Encyclopedia of radio electronics and electrical engineering
▪ article AON power supply. Encyclopedia of radio electronics and electrical engineering
Leave your comment on this article:
Comments on the article:
a guest
Hi!! I looked at your proposed scheme, so I can say with accuracy, they don’t agree with mine, I have a board: XB358V, maybe there is something to see? The smd resistor R24-value is not visible and there is no diagram, if you can help.
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