AATCC 84:2000 pdf download.Electrical Resistance of Yarns
1. Purpose and Scope
1.1 The purpose of this method is to determine the electrical resistance of any textile yarns containing natural or man- made fibers. The tendency of a textile yarn to accumulate electrical charges may depend upon the electrical resistance of the yarn. Due to the mechanism of conductance, this method is not applica- ble to yarns containing randomly situated stainless steel or other highly conductive fibers (refer to AATCC Method 76 for determination of surface electrical resis- tivity of fabrics).
2. Principle
2.1 Specimens of yam are conditioned at specified relative humidity and temper- ature. The electrical resistance of the yarn held between two electrodes is measured by the use of an electrical resistance meter.
3. Terminology
3.1 electrical resistance, n.-the physical property of a material which is a measure of the ability of electrons to flow through it when a voltage is applied across two points on the material (resis- tance [in ohms] equal voltage [in volts] divided by current flow [in amperes]). NOTE: This test method measures the electrical resistance of a material between two electrodes, and the results are ex- pressed as resistance per unit of length per yarn strand, ohms per 10 mm.
4. Safety Precautions NOTE: These safety precautions are for information purposes only. The pre- cautions are ancillary to the testing proce- dures and are not intended to be all inclu- sive. It is the user 's responsibility to use safe and proper techniques in handling materials in this test method. Manufac- turers MUST be consulted for specific details such as material safety data sheets and other manufacturer 's recommenda- tions. All OSHA standard and rules must also be consulted and followed.
4.3 The radioactive bar emits alpha ra- diation which is extermally harmless to the human body. The radioactive isotope polonium 210 is toxic and precaution should be exercised to prevent ingestion or inhalation of the solid material. Do not take the radioactive bar apart or touch the radioactive strip under the grid. If the strip is touched or handled, wash hands thoroughly at once. Return the device to the manufacturer when it loses its effec- tiveness as a static eliminator or for dis- posal if use is to be discontinued. Do not discard as scrap.AATCC 84 pdf download.