I. 0 om electrical resistance
Focus: simulation and digital location。
So long as it is the earth, it will be brought together, then it will enter. If it is not connected, it is “floating”, with a low pressure, which tends to accumulate the charge and causes static electricity. Reference 0 is made, all voltages are generated by reference, standards are consistent, so the sites should be shorter。
It is believed that the earth is capable of absorbing all charges and maintaining stability at all times, and is the final point of reference. Although some of the panels were not connected to the land, the power plant was connected to the land and the electricity on board eventually returned to the ground. If the analogue and digital areas are directly linked, they can lead to interference。
There are four ways to solve this problem:
Connected with magnetic beads
(b) connecting with electric capacity
Connecting with electrons
Connected with zero om electrical resistance。
Distinction:
Equivalent circuits of magnetic beads are equivalent to tape-retarded wavers, have a significant inhibition of noise only at a certain frequency point and need to be used in advance to estimate the frequency of the noise in order to select the appropriate model. Magnetic beads do not match in cases where frequency is uncertain or unpredictable
Electro-contraception, resulting in floating areas
(a) large electrons, wide dispersion parameters and instability
Zero-eu electrical resistance is equivalent to a very narrow circuit, effectively limiting the circulation of circuits and inhibiting noise. Electro-retardation in all frequency bands (0 euros of electrical resistance as well) is stronger than magnets。
Other effects of om electrical resistance:
There is no function on the circuits, except for reasons such as debugging the design for convenience or compatibility。
A jump line can be used, and if a section of the circuit is not used, it is sufficient that the resistance is not attached (without prejudice to appearance)。
In case of uncertainty in matching circuit parameters, replace with 0 om, debugging in practice, establish parameters and replace them with components with specific values。
When measuring current consumption in a certain part of the circuit, it is possible to remove the zerom electrical resistance and connect to the current meter so that current consumption can be measured。
When you're wiring, if you can't get past it, then you can add a zero-e barrier
Under a high-frequency signal, it acts as a sensor or as an electric capacity (as related to the characteristics of the external circuit), mainly addressing the emc problem. It's between ground and ground, power and ic pin
Single-point location (means protection site, work site, direct flow on equipment separate from each other, each becoming an independent system)
Melting
It's for current circuits when you cross
When the shortest back-flow path of the signal is broken after the partitioning of the electrical floor, the signal loop has to be bypassed to form a large ring area, and the impact of the electric field and the magnetic field has become stronger, prone to interference/disruption. Crossing of the 0-eu electrical barrier on the partition would provide a shorter circuit and reduce interference。
Configure circuits
In general, no jumplines and dial switches should appear on products. In some cases, the user moves the set-up so that it can be misinterpreted that, in order to reduce maintenance costs, welding on board, such as a zero-eu electrical barrier, should be used instead of a jumper. An empty jumper is equivalent to an antenna at a high frequency, with a good electrical resistance with a sticker。
Other uses
Cross-lined, debugging/testing, temporary replacement of other stickers, as temperature compensaters, more often because of the emc response。
In addition, zero om electrical resistance is smaller than perforation, and perforation also affects ground level (because of holes to be dug) and there are twoas of one a, 0805, which are different sizes for different sizes, which allow different types of electrical resistance。
Also, when reserved for magnetic beads, electrons, etc., they have to be sealed according to the size of the beads, electrons, etc., so there are all the different sizes of 0603 and 0805。
Annex 1: role of om electrical resistance
1 om electrical resistance is often tested in circuits, for example, when it is necessary to measure currents in a circuit, we can string up a 1 om electrical barrier in the circuit, measuring the currents of the circuit at both ends (i=u/r, since r=1, the measured voltage values are current values)。
Ii. Magnetic beads
Magnetic beads are designed to suppress signal lines, high frequency noise and peak interference on power lines, and have the capacity to absorb electrostatic pulses。
Magnetic beads are used to absorb ultra-high frequency signals, such as some rf circuits, plls, oscillating circuits, uhf storage circuits (ddrs, sdram, rambus, etc.), which require magnetic beads in part of the power input, whereas the sensor is an energy element used in lc oscillating circuits, medium- and low-frequency filter circuits, etc., with a frequency range that rarely exceeds 50 mhz。
Magnetic beads have high rates of resistance and magnetic conductivity, which are equivalent to resistance and sensory coupons, but both are subject to frequency changes。
Magnetic bead function:
The main thing is to eliminate the rf noise that exists in transmission line structures (wireways), the rf energy is the communication swiring composition that is superseded to the straight current transmission level, which is a useful signal required, while the radio-frequency rf energy is the useless electromagnetic interference that transmits and radiation along the line (emi)。
To eliminate these unwanted signal energy, the high-frequency resistance function (degrador) is performed using a tablet magnet, which allows a straight-flow signal to pass and filters the communication signal. The hf signal is usually over 30 mhz, but the low frequency signal is also affected by a piece of magnetic bead。
Magnetic beads have high resistance and magnetic conductivity, and they are equivalent to resistance and sensory coupons, but both are subject to frequency changes. It has a better high frequency filterer than the normal sense of electrons and is resistant to high frequency, so it can maintain high resistance within a relatively wide frequency range, thus increasing the effect of fm filtering。
Power filters can be used. The wiring symbol of the magnetic beads is a sense, but it can be seen on the model that the beads are being used on the circuital function, that they have the same principles and that they have different frequency characteristics。
Note: the units of the magnets are om, not henry, and this requires special attention. Because the units of the magnets are labeled according to the resistance it produces at a certain frequency, and the units of resistance are also orm。
Electricity
Electric sense is an attribute of closed circuits. When the coil passes through the current, the magnetic field is formed in the coil, which in turn produces the sensory current to resist the current through the coil. This current interaction with the coil is referred to as electrical resistance, i. E. Telepathy, in “henry(h)”。
The difference between magnetic beads and electrons:
An electric sense is a storage element, while a magnet is an energy conversion (consumption) device. Electricity is used mostly for power filter circuits, focusing on the suppression of conductive interference, and magnetic beads for signal circuits, mainly for emi。
Magnetic beads are used to absorb ultra-high frequency signals such as some rf circuits, plls, oscillating circuits, uhf storage circuits (ddrs, sdram, rambus, etc.) require magnetic beads on the part of the power input, whereas the sensor is a storage element, which is used on lc oscillating circuits, medium and low frequency filter circuits, etc., with a frequency range of less than 50 mhz。
In circuit functions, magnetic beads and electrons are the same principles, except for their different frequency characteristics。
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