Pulsed Nuclear Radiation Effects on Resistors and Cables, SPRF IV
Abstract
Various cable and resistor types and an operating micromodule multivibrator circuit were exposed to a pulsed nuclear radiation environment (SPRF) and their transient response measured during the pulse. The initial RG-59 B/U cable response was determined to be voltage dependent and averaged 0.15 microamps per volt superimposed on a zero voltage 'replacement' current of -15 microamps. A miniature low noise cable, with conductive interfaces, gave the lowest and most stable response of all cables tested. The attenuation of three different types of RF cables was measured and the signal in JT-205 with foamed polyethylene was attenuated approximately 20%. The US-DEV -15 cable with perforated tape teflon averaged 0.3% and for RG-8 A/U, a solid polyethylene dielectric, attenuation averaged 0.5%. Carbon composition, deposited carbon film, nichrome film, tin oxide, wirewound, cermet, and gasfilled 'Minuteman' resistors of various wattages were tested in an unpotted, conformally coated, and potted condition. All low value resistors tested (less than 1500 ohms) maintained tolerance levels even in unpotted conditions. For the unpotted higher-value resistors (10 K ohm) the shunting effect of the ionized air may cause a resistance change of the order of 2% which can be reduced to 1% by conformal coating. The 100 K ohm 'Minuteman' gas-filled resistor showed an effective decrease of 7% during exposure.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1964
- Accession Number
- AD0622974
Entities
People
- Charles P. Lascaro
- Joseph Newberg
- William Schlosser
Organizations
- United States Army Communications-Electronics Command