This section provides overview, applications, and principles of check terminal. Also, please take a look at the list of 7 check terminal manufacturers and their company rankings.
Check terminal is used to check the connection and operation of electronic components on a circuit board in circuit design or to check electrical characteristics in the manufacturing process.
When using an oscilloscope, it is difficult to always hold a probe in one's hand to check, so measurements are made by connecting it to a check terminal. The check terminal have a shape that makes it easy to apply a probe to it and reduces subtle errors caused by differences in capacitance and the force exerted by the human hand.
They are sometimes called checker tips or test terminals.
Check terminals are used to check board operation and electrical characteristics. They are often mounted on finished products as a nesting base for direct connection to the board. There are two types: one for board mounting and the other for surface mounting.
A wide range of sizes and shapes are available, so you can choose the one that best suits your application. Check terminals are selected according to board space and probe shape. Those that are not plated on the inside can be used for flow soldering, and the color of the beads can be differentiated for each signal line.
The principle of check terminals are simple: by placing them in a circuit, some of the wiring is enlarged to make it easier to measure. Check terminals are used at the points where you want to check voltages, etc. with a tester or oscilloscope. It is a good idea to decide on the location of the check terminals when designing the circuit. It is convenient later to avoid placing tall electronic components around the check terminals, taking into account that probes may be applied to them.
Solder the check terminals to the circuit and measure directly over it with a probe. Depending on the shape, there are types that press the probe on, hook it onto a loop, or fasten it with an alligator clip.
Check terminals are made of stainless steel or brass, and the outside is plated with gold or brass over nickel. Operating temperatures range from -40°C to 150°C. Many RoHS compliant products have appeared in recent years.
Check terminals for logic circuits, suitable for logic circuits, allow mounting on through-hole lands for upper and lower continuity. Check terminals for panels and signal checks are also available.
Check terminals blocks are used for check terminals that are conventionally used for test points on control circuit boards, etc. By aggregating these individual check terminals into a terminal block, for example, GND, power supply, etc., the common part of each check terminals can be used as a common terminal block. By replacing the part common to each check terminals with a short bar as a common terminal, wiring and the number of terminals are reduced, saving space and reducing costs.
By using this check terminals block, line inspections of electrical systems, which until then required multiple check terminals in a row, tester terminals, alligator clips, and special jigs when conducting continuity tests and withstand voltage tests on electrical products, have become complicated with wiring and time-consuming and difficult when troubleshooting or maintenance is required. By using check terminals blocks, man-hours spent on manufacturing electrical inspection jigs and inspection man-hours can be greatly reduced, and line testing of electrical products itself can be simplified.
Test pins are another name for check terminals, which are pins (terminals) used to inspect printed circuit boards for control and terminal blocks of controllers. Test pins are commercially available from specialized manufacturers such as MacEight that handle the peripheral accessories needed when checking board operation. When checking the operation of electronic circuits such as debugging, it is tempting to make the test pins larger or to place them in locations that give priority to the work.
However, if the test pins are selected or placed incorrectly, the wiring capacitance will increase, the wiring impedance will be affected by the expansion of the wiring length and area, antennae and reflected noise will be generated due to unnecessary radiation noise, and the so-called wiring impedance matching and shielding lines will be affected. Impedance matching and shielding line imbalance occur, resulting in erroneous measurements.
*Including some distributors, etc.
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