1、FORD LABORATORY TEST METHOD BN 156-01 2001 O924 ELECTRICAL RESISTANCE TEST FOR TEXTILES Revised Editorial - no technical change A. Cockman Application This procedure is used to determine the electrostatic properties of automotive seating fabrics by measuring their surface resistance. A maximum value
2、 for surface resistance is also specified. Seating fabrics complying with this requirement are unlikely to transmit sufficient electrostatic charge to cause discomfort to a vehicle user, when exiting from the vehicle. Apparatus Required 1. An electrical resistance meter with the following characteri
3、stics: Measuring Range: 102M Ohm to IO6 M Ohm Accuracy: +/- 5 % over measuring range c IO4 M Ohm +/- 1 O % over measuring range 1 O4 M Ohm Measuring Voltage: 1 O0 V 2. Electrode as in Figure 1. For further information see DIN 54 345, para 3.1 Source (Items 1 gloves should be worn or tweezers used. B
4、efore each series of measurements, the insulation of the complete test apparatus shall be checked by measuring the surface resistance without a sample. Stray electrical charges can affect test results and must be avoided. Note: The base plate should be wiped with acetone to remove deposits that may
5、conduct an electric current. The base plate Q) with insulating layer (2) uppermost is placed on the cylinder (6). The test specimen is placed on the insulating layer (2) and the ring electrode (3 and 4) is placed concentrically on the test specimen (see Figure 1). Electrical circuit is shown in Figu
6、re 2. The measuring voltage is applied and surface resistance measured after 60 +/- 2 seconds. Evaluation Report the average value of the five individual measurements in M Ohm. The surface resistance shall not exceed 5 x IO4 M Ohm. Chemicals, materials, parts, and equipment referenced in this docume
7、nt must be used and handled properly. Each party is responsible for determining proper use and handling in its facilities. Page 2 of 3 Copynght02001, Ford Global Technologies, Inc FORD LABORATORY TEST METHOD BN 156-01 ELECTRICAL RESISTANCE TEST FOR TEXTILES 1 LIIO mm 1 1. Metallic base plate (e.g. s
8、tainless steel) 2. Insulating layer of high- insulating material. (e.g. Teflon) 3. Metal disc (e.g. stainless steel) 4. Metal ring (e.g. stainless steel) 5. Metallic shielding plate (e.g. stainless steel) 6. Cylinder of insulating material. (e.g. plexi glass) 7. Insulating layer of high insulating m
9、aterial 8. Test Specimen 9. High range ohm meter and I O0 V source Figure 1 Measuring Electrode Figure 2 Arrangement for measuring surface resistance 9 M is connection to measuring instrument U is connection to voltage supply 4 is earth connection Page 3 of 3 Copynght02001, Ford Global Technologies, Inc
