One peristaltic pump is used to add the sample liquid, and the other peristaltic pump is used to connect the rotary arm, extract and inject the sample liquid. A diaphragm pump is used to extract the waste liquid (the liquid used to clean the sample needle
It is known for its excellent thermal stability, low dielectric constant, high breakdown voltage and high dielectric strength. This makes it suitable for creating rigid flexible printed circuit boards.
HDI technology allows designers to drastically reduce the size of the circuit, while still ensuring the required reliability and signal integrity. For engineers, the challenges to be faced are particularly tough, mainly related to the fabrication process.
The use of direct paving mode is characterized by a strong overcurrent capacity of the pad, for high-power circuit device pins must be used in this way. At the same time, its thermal conductivity is also very strong, although the work is good for the heat
Like this kind of treatment method for those engaged in small household appliances PCB Layout friends are not unfamiliar, so if the amount of tin is uniform enough and the amount of tin is enough, this 1mm wire can be seen as more than a 2mm wire.
The special requirements for power transmission lines and the need to isolate noise coupling between analog and digital circuits add further complexity to the layout and wiring of mixed-signal PCBS.
The spacing and size of conductive rubber keys shall be consistent with the actual size of conductive rubber keys, and the PCB board connected with this shall be designed as a gold finger, and the corresponding gold-plated thickness shall be specified.
The larger the number of turns of common mode choke, the larger the parasitic capacitance and the worse the effect of high frequency isolation.
Some customers have designed contour lines for Keep layer, Board layer, Top over layer and so on, and these contour lines do not coincide, which makes it difficult for PCB manufacturers to judge which contour line shall prevail.
Correct PCB pad design, if there is a small amount of skew during patch processing, can be corrected during reflow welding due to the action of surface tension of the molten solder.
In the design of high density PCB, the use of non-through-hole and the reduction of through-hole size also bring the cost increase, and the through-hole size can not be reduced indefinitely, it is limited by PCB manufacturers drilling and electroplating t
When the power supply or ground short circuit is found during debugging, the zero ohm resistance can be removed to narrow the search range.
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