Tester in your pocket. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Measuring technology
Comments on the article
Having made a mini-tester for myself, for several years now I have been using it to repair household electrical and radio equipment. Assembled according to the classical scheme, the device allows measuring voltages up to 300 V in DC and AC circuits with sufficient accuracy for practice, checking resistors, diodes, transistors and capacitors.
For the manufacture of such a mini-tester, a small number of radio components is required, and not one of them belongs to the category of expensive and acutely scarce. They are always, as they say, at hand, they can be easily found in stock from any radio amateur. And as a supporting structure, a mounting plate and a body of the device, ... the M42100 measuring head itself (or a similar type), designed to measure a direct voltage of 3 or 30 V, is used.
Schematic diagram of a homemade mii-tester
mini tester
Miniature sockets are mounted on the head body. There are also "seats" for the M3 screw (the "General" probe is attached to it), the variable resistor R2 "Set.0" and the FRM-1 lamp, which acts as a case for a power source such as STs32, STs21, etc. If desired, a phase indicator can be added to the device (shown in dotted lines in the diagram) - there is enough space inside the head.
The scale "-30 V" is basic, taken ready. It binds divisions in the range with the upper limit "-300 V". And for measuring alternating voltages (due to the nonlinearity of the initial section), as well as for measuring resistances, it is desirable to have additional scales. They are calibrated according to methods that are described in sufficient detail in the popular literature.
It is advisable to replace the glass in the tester with a Plexiglas plate - it will not break when the device is hit or dropped.
Author: V.Rezko
See other articles Section Measuring technology.
Read and write useful comments on this article.
<< Back
Latest news of science and technology, new electronics:
The world's tallest astronomical observatory opened
04.05.2024
Exploring space and its mysteries is a task that attracts the attention of astronomers from all over the world. In the fresh air of the high mountains, far from city light pollution, the stars and planets reveal their secrets with greater clarity. A new page is opening in the history of astronomy with the opening of the world's highest astronomical observatory - the Atacama Observatory of the University of Tokyo. The Atacama Observatory, located at an altitude of 5640 meters above sea level, opens up new opportunities for astronomers in the study of space. This site has become the highest location for a ground-based telescope, providing researchers with a unique tool for studying infrared waves in the Universe. Although the high altitude location provides clearer skies and less interference from the atmosphere, building an observatory on a high mountain poses enormous difficulties and challenges. However, despite the difficulties, the new observatory opens up broad research prospects for astronomers. ... >>
Controlling objects using air currents
04.05.2024
The development of robotics continues to open up new prospects for us in the field of automation and control of various objects. Recently, Finnish scientists presented an innovative approach to controlling humanoid robots using air currents. This method promises to revolutionize the way objects are manipulated and open new horizons in the field of robotics. The idea of controlling objects using air currents is not new, but until recently, implementing such concepts remained a challenge. Finnish researchers have developed an innovative method that allows robots to manipulate objects using special air jets as "air fingers". The air flow control algorithm, developed by a team of specialists, is based on a thorough study of the movement of objects in the air flow. The air jet control system, carried out using special motors, allows you to direct objects without resorting to physical ... >>
Purebred dogs get sick no more often than purebred dogs
03.05.2024
Caring for the health of our pets is an important aspect of the life of every dog owner. However, there is a common assumption that purebred dogs are more susceptible to diseases compared to mixed dogs. New research led by researchers at the Texas School of Veterinary Medicine and Biomedical Sciences brings new perspective to this question. A study conducted by the Dog Aging Project (DAP) of more than 27 companion dogs found that purebred and mixed dogs were generally equally likely to experience various diseases. Although some breeds may be more susceptible to certain diseases, the overall diagnosis rate is virtually the same between both groups. The Dog Aging Project's chief veterinarian, Dr. Keith Creevy, notes that there are several well-known diseases that are more common in certain breeds of dogs, which supports the notion that purebred dogs are more susceptible to disease. ... >>
| Random news from the Archive Solid State Drives SSDNow KC380 from Kingston Technology
20.06.2013
The start of sales of SSDNow KC380 solid-state drives was announced by Kingston Technology, a company specializing in the production of data storage devices. The Kingston SSDNow KC380 solid state drive is designed in 1,8-inch form factor, so it is well suited for installation in laptops, tablets and netbooks with a reduced storage bay. The novelty weighs less than hard drives, surpassing them in reliability and speed.
The SSDNow KC380 uses the SandForce SF2241 controller. To connect to the host, use the SATA 6 Gb / s interface. According to the manufacturer, the sequential read speed reaches 550 MB / s, sequential write - 520 MB / s.
The series includes models with a capacity of 60 and 120 GB. The maximum performance in 4 KB read mode is 86000 IOPS. The maximum performance in the write mode in blocks of 4 KB depends on the volume and is 79000 IOPS for the younger model, 48000 IOPS for the older one. In the case of random access in blocks of 4 KB, the performance on read operations is 14000 and 17000 IOPS, and on write operations - 77000 and 45000 IOPS for SSDs of 60 and 120 GB, respectively.
The manufacturer estimates the drive resource at 46,5 TB and 93 TB (the total amount of information that can be recorded over the entire service life). The warranty period is three years. With dimensions of 78,5 x 54 x 5 mm, the devices weigh 27,43 g.
|
Other interesting news:
▪ LG Pocket Photo 2
▪ grass paper
▪ DDR3 Ultra Low Profile (ULP) Planar Mini-UDIMM 8 GB
▪ High-speed Internet between the Earth and the Moon
▪ Passenger on x-ray
News feed of science and technology, new electronics
Interesting materials of the Free Technical Library:
▪ section of the site Tools and mechanisms for agriculture. Article selection
▪ Hymen article. Popular expression
▪ article Where is the Ice Cream Graveyard located? Detailed answer
▪ article Occupational safety of forestry workers
▪ article Face and hand creams. Simple recipes and tips
▪ article Electrical installations for special purposes. Electrothermal installations. Arc electric furnaces. 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