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APF1908-10RGI Datasheet(PDF) 4 Page - Welwyn Components Limited |
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APF1908-10RGI Datasheet(HTML) 4 Page - Welwyn Components Limited |
4 / 7 page Tubular Vitreous Enamelled Wirewound Resistors 1600/1900 Series © Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com 124 Issue E · 10.05 Welwyn Components Table 3 Adjustable Resistors (see Figure 9) Adjustable resistors use the same basic construction as fixed resistors already described, and have a window in the vitreous enamel through which contact is made to the resistive element by a sliding contact band. The band is fitted with a clamping screw and nut to retain it firmly in position. The adjustable winding style has a maximum permissible hot spot temperature of 300°C and the maximum dissipation, for an ambient temperature of 20°C, is specified in Table 4. The partial open winding necessitates a reduced maximum resistance, when compared with fixed resistors, and the resistance range is also defined in Table 4. More than one adjusting band can be fitted, up to the maximum number specified in Table 3. Adjustable resistors are available in termination styles B, 4B, AP, C, CB and CP, in sizes 1602 to 1609 inclusive and 1906 and 1908 denoted by prefix ‘V’. Manufactured Values E24 preferred Standard Selection Tolerance ±10% All other details of the electrical and environmental performance of adjustable resistors are the same as for fixed resistors. Max. dissipation in Resistance range (ohms) 20°C ambient (watts) Type Min. for Min. for Max. for 200°C 300°C styles VC, all other all styles hot spot hot spot VCP styles 1602 8 15.5 4 3 1.6k 1906 9.5 19 4 3 2.5k 1603 11 22 6 6 3.0k 1604 16 31 8 8 5.3k 1605 21 41 6 6 4.5k 1908 24 47 11 10 7.5k 1607 34 66 11 9 8.1k 1606 41 80 14 13 13.2k 1608 52 101 17 16 15.4k 1609 74 145 25 24 25.5k Tube A mm B mm Hole C Max. no of size max. max. dia. mm adjusting bands 1602 1603 20 27 3.2 1 1906 1604 1605 20 27 3.2 3 1908 25 32 3.7 2 1606 25 32 3.7 4 1607 30 38 3.7 2 1608 30 38 3.7 3 1609 30 38 3.7 5 Table 4 |
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