About Feedthrough Filter (2)

3. Instructions to the usage of a feedthrough filter 1). Installment Notes Since the installment method and craft will directly affect the performance of the filter, the following instructions should be followed when a filter is installed: Firstly, an appropriate installment position should be chosen which is usually at the entrance to equipment or a screen; Secondly, filter should be screened with its shell connected with filter ground line. The filter shell should be well connected with the equipment metal shell if it has one, the closer to the equipment shell grounding point, the better. Thirdly, the inner connection of the filter should be short in case of coupling interference and unwanted exposition of strong electromagnetic field. Fourthly, as regards thread fastened feedthrough capacitor, it is recommended to use tools with torque scale to install. Requirements are as shown in Diagram 3: Fifthly, contact resistance should be as small as possible to guarantee the bypass effect of the filter capacitor. To reduce contact resistance and to get a reliable connection, it is better to insert an inner gear, an outer gear ring and a mat between filter and isolation board. Sixthly, to avoid the coupling of outer leads of the filter, it is required that input lead and output lead be drawn from different sides and an isolation screen should be inserted between these two groups of leads when necessary. Seventhly, a soldering filter can be welded by means of ironing or hot air recirculation. When ironing soldering is adopted, the product should preheated under 150 Celsius degrees and ironing power should be under 35 w, with temperature no higher than 260 Celsius degrees. When temperature reaches that maximum, the soldering time should be no longer than 5s. When hot air recirculation soldering is adopted, the temperature should be changed according to the following curve: 2). With lead running through Feedthrough filter, ceramic capacitors, organic film capacitors and inductor, are vulnerable to thermal shocks, fierce mechanic force or sudden voltage rise. In consequence, force should not be overused to bend the lead. Moreover, relatively thick lead should not be bent or cut. Specifications should be explained directly to the manufacturer when necessary. 3). The filter should be connected to the ground wire of its base, that is, the filter shell should be grounded so as to eliminate interfering signals, by means of fastening the threaded shell, fastening the nut or by soldering. 4). Soldering time should be as short as possible in case that the ceramic capacitor might be damaged because of the thermal shocks. During the process of soldering, rosin flux should be used and the air should be cooled naturally in case that thermal shocks might cause an internal stress and thus impose an electric deterioration on the product. 5). Special tools such as torque scales, instead of pinchers, should be adopted to install the base of hexagon feedthrough filter. 6). Soak cleaning is not applicable to encapsulated feedthrough filter after soldering and the soldering point should not be washed by cool liquid immediately, or else the capacitor in the filter might be damaged. Measurement and adjustment should not be carried out until the filter is cold, cleaned and dried. 2). With lead running through Feedthrough filter, ceramic capacitors, organic film capacitors and inductor, are vulnerable to thermal shocks, fierce mechanic force or sudden voltage rise. In consequence, force should not be overused to bend the lead. Moreover, relatively thick lead should not be bent or cut. Specifications should be explained directly to the manufacturer when necessary. 3). The filter should be connected to the ground wire of its base, that is, the filter shell should be grounded so as to eliminate interfering signals, by means of fastening the threaded shell, fastening the nut or by soldering. 4). Soldering time should be as short as possible in case that the ceramic capacitor might be damaged because of the thermal shocks. During the process of soldering, rosin flux should be used and the air should be cooled naturally in case that thermal shocks might cause an internal stress and thus impose an electric deterioration on the product. 5). Special tools such as torque scales, instead of pinchers, should be adopted to install the base of hexagon feedthrough filter. 6). Soak cleaning is not applicable to encapsulated feedthrough filter after soldering and the soldering point should not be washed by cool liquid immediately, or else the capacitor in the filter might be damaged. Measurement and adjustment should not be carried out until the filter is cold, cleaned and dried. 4. Feedthrough Filter Type Number Orders for CC52 and CT52 are listed in detail in this guidebook, while LC5102、LC5201 and LC5301 will be ordered according to the following names and specifications: Examples LC 5102 — B 01 1—C Y—102M— D—(Y**) 1 2 3 4 5 6 7 8 910 1. RFI filter 2. soldering feedthrough filter 3. installation specification 4. serial number 5. circuit form 6. special lead 7. temperature property 8. capacitance and precision 9. rated current 10.rated voltage LC represents radio frequency interference filter;5102 represents product classification（5102 stands for soldering filters; 5201, screw mount thread filters;5301, screw mount tube filters）;B011 can be specified as follows: B represents installation size (φ2.8mm);01, serial number;1,the circuit being C type. C is the code of rated voltage, that is, 100V;DCY is the code of rated current, 2A; 102M means that the capacitance and capacitance tolerance is 1000±20%pF;D is the working temperature, that is, -55°C～125°C，Y** stands for special lead (ordinary lead not being marked). Y is hard lead，“**”stands for the special size of lead. Code number for installation size, circuit form, rated voltage, rated current and capacitance Tolerance are listed in the following four diagrams. Our advantage: 1. Chinese military products 2. High peformance and low price 3. ISO9001 and GJB9001-2001A Chinese Military Quality System Certificate 4. The custom of special productand designis accepted 5. Detailed datasheet can be downloaded in our website