PRODUCTION FACILITIES FOR MULTI-TURN METALFILM TRIMMER RESISTORS PER SIGNAL CORPS TECHNICAL REQUIREMENTS SCS-127 DATED 9 FEBRUARY, 1962.
Quarterly progress rept. no. 8, 1 Apr-30 Jun 64.
WESTON INSTRUMENTS INC NEWARK N J
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Twenty 20 50K units were placed on load life test to determine if the new end insulator 244500 made with a high-temperature material Rolube would meet the load life requirement of SCL-6111. One per cent change at 125C with 12 watt for 1000 hours. All units stayed within two per cent, with eleven 11 staying within one per cent. Twenty 20 200K units were tested similarly to the above. All units stayed within two per cent, with thirteen 13 staying within one per cent. It was requested that the SCL6111 specification be changed to MIL-R-22097B, Condition E, for spiral units, and Condition C for toroids. A complete review of the project indicated a changeover to MIL-R22097B was possible. Ten 10 50K units were placed on load life test to evaluate MIL-R-22097B, Condition E one per cent change at 85C with 12 watt for 1000 hours and they have stayed well within 12 per cent. The toroid contact holder 244547 was produced with excellent results on centering of the groove however, the entire lot was rejected for incorrect tap drill size. These parts have been re-ordered.