58results about How to "High resistance precision" patented technology

Provided are an atmospheric corrosion test procedure and an apparatus used for the test. The procedure involves a salt spray step for supplying salt content containing chloride ions on the surfaces of test pieces placed in a thermo-humidistat chamber and a subsequent dry-wet cyclic step including a dry sub-step for drying the surface of the test pieces in the thermo-humidistat chamber at a low relative humidity and a subsequent wet sub-step at a higher relative humidity than that in the dry sub-step, which are cycled. The salt content is supplied by spraying the salt water in the salt spray step. An exhaust step for removing the salt mist sprayed inside thermo-humidistat chamber is further inserted between the salt deposition step and the dry sub-step. The quantity of the salt content deposited on the surfaces of the test pieces is controlled by adjusting the quantity of the sprayed salt water.

This invention relates to resin sizing material used in sheet resistors including an adhesive and a filler, among which, the adhesive is a mixture of bakelite and epoxy resin formed in an organic solution, the filler is one of white, black fillers or a noble metal powder. The said sizing material is used in a secondary enveloper, markers and end electrodes of the resistor and completely solidified under 160-250deg.C not influencing the sheet resistors.

This invention discloses a manufacturing method for slice thermal resistors, which prints a back electrode on the back of a marked slot side of an insulated ceramic chip, prints a face electrode on the slot side, then prints a thermal resisting layer and a protection layer with a thick film silk screen, which can reduce the processing time of slice thermal resistors effectively.

Provided is a compact and easily mountable current detection device in which a resistor body can be easily inserted in a current path, and a voltage value produced by the current can be easily obtained. The current detection device comprises a unit metal member (11A, 11B, 11C) that pass a current to be detected, a pair of voltage terminals (14, 14), which obtain a voltage signal from the unit metal member, and a holding member (16) that holds a plural of the unit metal members in parallel. A plural of the unit metal members (11A, 11B, 11C) is interposed between the holding member (16) and the board (17) on which a plural of wiring patterns is formed, and each pair of the voltage terminals (14, 14) of the unit metal member is connected to each wiring pattern formed on the board.

The invention discloses a manufacturing technology for improving resistance precision of a conductive carbon oil printed circuit board. The manufacturing technology comprises the working procedures of conductive carbon oil printing, reflow soldering processing and solder resist manufacturing and the like; the single surface or double surfaces of the conductive carbon oil are printed among the circuits of the circuit board to form the conductive carbon oil resistance; the good stability and higher precision of the conductive carbon oil are ensured by repeated rapid temperature rising processing; and the stability of the resistance is improved by performing the solder resist printing on the circuit board through a solder resist ink without adding a diluent. The manufacturing technology for improving resistance precision of the conductive carbon oil printed circuit board has the characteristics of high resistance precision, high product stability, high product yield, high production efficiency and low cost.

The invention relates to a potentiometer with four step plates for DV voltage measurement; resistors on the step plates are designed to have the resistance of the integral power of 10; standard resistors can be compared on a bridge, thereby facilitating instrument manufacturing, improving the manufacturing precision of the resistors on measuring plates and replacement plates, and improving the measurement accuracy of the complete potentiometer; the four measuring plates are directly connected by leads and are not switched by switches, so that no switch contact resistance difference impact exists when the potentiometer is used for measurement; because contacts and whole rings are made of the same material, heat thermo emf and variable heat thermo emf produced by the movement of a brush arethe same and in reverse directions; and therefore, the potentiometer can measure micro-voltage.

A separator of a fuel cell to be laminated while sandwiching a membrane electrode assembly forming a power generation region includes a source connection point tab for inputting and outputting an alternating current for internal resistance measurement, a sense connection point tab for detecting a potential of the alternating current input and output to and from the source connection point tab and separation portion configured to separate the sense connection point tab from a current path of the alternating current for internal resistance measurement from the source connection point tab to the power generation region.

The invention relates to a chip film fixed resistor and its making method. The chip film fixed resistor includes a substrate, a metal resistance layer, inner electrode layers, outer electrode layers and a protection layer, the middle portion of the upper surface of the substrate is provided with the metal resistance layer, the substrate at two sides of the metal resistance layer is coated with the inner electrode layers in a mirror symmetry manner, the two inner electrode layers are connected with the metal resistance layer, the protection layer is covered between the connection portions of the two inner electrode layers and the metal resistance layer, and the inner electrode layers are coated with the outer electrode layers respectively. The resistor made by repeatedly measuring and calculating through a special technology has the advantages of high resistance precision, small temperature coefficient, good moisture resistance and good weldability, and is very suitable for being used in precise electronic circuits, the size of the resistor made through the making technology can be adjusted according to different requirements of power and resistance, the resistance can be 10-1Momega, the minimum value of the thickness of each of the outer electrode layers reaches 0.25mm, and the minimum value of the total length of the resistor reaches 0.8mm.

The invention discloses a method for embedding capacitors in a printed-circuit board and the printed-circuit board adopted by the method and belongs to the technical field of printed-circuit board manufacturing processes. According to the technical key point, the method comprises the following steps that (1) basic bodies are manufactured; (2) the basic body 1, the basic body 2, the basic body 3 and a metal layer are pressed by means of a multiple-layer board manufacturing process, one or more of the basic body 1, the basic body 2, the basic body 3 and the metal layer are combined and pressed to form a multiple-layer printed-circuit board, and the basic body 1 is arranged among the contact portions of the basic body 2, the basic body 3 and the metal layer; (3) drilling and metallization are performed; (4) outer-layer graph making is performed to form the multiple-layer printed-circuit board provided with multiple layers of embedded single capacitors and/or a multiple-layer single capacitor paralleled-connection structure. The method for embedding the capacitors in the printed-circuit board achieves accurate control of values of the embedded capacitors on the premise that additional cost is not needed to be increased, is simple in process and is used for manufacturing the printed-circuit board.

The invention provides a method for measuring a resistance value of a conversion resistor of a current-mode analog to digital converter, which is used for improving the measurement and control precision of a measured physical object. The method comprises the following steps of: keeping a current signal input into the current-mode analog to digital converter constant; acquiring a first digital value AD0 which is obtained after the current signal is converted by the current-mode analog to digital converter; parallelly connecting a resistor Rj of which the precision is higher than that of the conversion resistor Rz of the current-mode analog to digital converter with the conversion resistor Rz; acquiring a second digital value AD1 which is obtained after the current signal is converted by the current-mode analog to digital converter again; and obtaining the resistance value of the conversion resistor Rz according to a formula shown in the specifications, wherein R1 is the obtained resistance value of the conversion resistor R2 and R2 is the resistance value of the resistor Rj of which the precision is higher than that of the conversion resistor Rz.

The invention discloses a fuse resistor, comprising an outgoing line, a protective layer and a resistor color circle mark coating. The outgoing line is connected with caps. The caps are located at the inner side of the protective layer. The caps are symmetrically arranged at two ends of a metal conductive layer. A resistance band is winded on the outer wall of the metal conductive layer. Temperature isolation plates and side plates are arranged between the caps and the metal conductive layer. The side plates are close to the sides of the caps. A basic framework is packaged in the metal conductive layer. Wiring terminals at two ends of the basic framework are connected with the caps. Cutting slots are arranged on the inner wall of the basic framework. Epoxy resin blocks are filled in the cutting slots. The fuse resistor is good in electrical stability and fuse effect. The resistor is protected through a high temperature resistant layer, so the service life of the resistor is effectively prolonged. The resistor has a good temperature coefficient and relatively high resistance value precision. The performance is excellent. A new kind is increased in the electronic market. The sale of the electronic market is expanded.

The invention discloses a precise voice control sensor integrated control device. A charge control/output protection and output compensation controller is used for detecting voltage of a signal output end, detecting gate charge of an MOS (metal oxide semiconductor) transistor M1 and gate charge of an MOS transistor M2 and detecting voltage of a signal input end, signal output is compensated through an intelligent linear switch, and voltage of signal output is enabled to be within a set voltage range; or output is enabled to be zero or a switch K1 and/or a switch K2 is closed. The precise voice control sensor integrated control device has extremely high noise resistance, extremely wide voice rang, tiny distortion, extremely small size and extremely few ports; full-domain signal input is adopted, the variable-frequency intelligent linear switch is introduced in, the innovative charge algorithm control technique is adopted for charge control, output protection and output compensation control, further diodes, resistors and JFETs (junction field-effect transistors) adopted by the device are all special semiconductor processes, integration of a system is optimized fundamentally, and tiny size can be realized.