Variable Compression Mica Padders

Trimmer Ranges I Printed Circuit I Padders

The Arco Type 30 Variable Compression Mica padder is designed with a ceramic base having walls which completely enclose and protect the plates and mica films from damage due to handling. The spring of the brass plates assures freedom from mechanical fatigue, and applies a consistent pressure when the adjusting screw is varied from tight to open position. All plates are cadmium plated to facilitate production soldering. MINIMUM CAPACITANCE Equal to or less then the value indicated below when the adjusting screw is rotated three turns from tight (1 3/4lb/in.) position. MAXIMUM CAPACITANCE Equal to or greater then the value indicated below when the adjusting screw is in tight position. TYPE 30 (250 WVDC - 500 Volts DC flash test Type 30 Guaranteed Range Part Number Tight (Cap > pF) at 3 turns (Cap > pF) 302 130 15 303 340 65 304 550 115 305 760 190 306 970 275 307 1180 350 308 1390 450 309 1600 550 310 1890 650 311 2110 780 312 2330 880 313 2605 1150 314 2830 1300 315 3055 1400 Screw is insulated from top plate by mica washer. Above maximum capacity values are based on using 1.5 to 1.75 Mil Mica films. TYPE 30-M (500 WVDC - 1000 Volts DC flash test) Type 30-M Guaranteed Range Part Number Tight (Cap > pF) at 3 turns (Cap > pF) 302M 120 15 303M 320 65 304M 500 100 305M 690 180 306M 880 265 307M 1070 340 308M 1260 425 309M 1415 525 310M 1600 615 311M 1785 730 312M 1970 800 313M 2155 1000 314M 2340 1100 315M 2525 1200 Screw is insulated from top plate by mica washer. Above maximum capacity values are based on using 2 to 2.25 Mil Mica films. TYPE L-30x The Type 30 or Type 30-M padder can now be obtained with a slotted shaft and bushing. To obtain this padder, precede the regular part number with the letter "L". For example, a 302 padder with the slotted shaft would be specified as "L-302".

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