1、 FORD LABORATORY TEST METHOD BB 101-13 Date Action Revisions 2000 08 07 Editorial no technical change A. Cockman 1995 08 30 Printed copies are uncontrolled Page 1 of 2 Copyright 2000, Ford Global Technologies, Inc. ELECTRICAL RESISTIVITY OF AUTOMOTIVE CABLE Application This method is to determine th
2、e electrical resistance of automotive cable with an insulated jacket. Materials and Apparatus Required Voltage Power Source 100 V minimum Wheatstone Bridge Deionized or Distilled Water 10 ppm max dissolved solids (ASTM D 1888) Beaker 1500 - 5000 mL Conditioning and Test Conditions All test values in
3、dicated herein are based on material conditioned in a controlled atmosphere of 23 +/ - 2 C and 50 +/ - 5 % relati ve humidity for not less than 24 h prior to testing and tested under the same conditions unless otherwise specified. Procedure 1. Prepare a test specimen as required by the relevant Engi
4、neering Materials Specification. 2. Fill the beaker with water. P lace specimen for 2 h in the water at 70 +/ - 2 C with the ends protruding 200 mm. 3. Apply a D.C. voltage of at least 100 V between conductor and water bath, and after 1 minute measure insulation resistance with a Wheatstone bridge.
5、FORD LABORATORY TEST METHOD BB 101-13 Page 2 of 2 Copyright 2000, Ford Global Technologies, Inc. 4. Calculate volume resistivity as follows: P1 = 2.73 x L x W Log (D2/D1) Where: P1 = volume resistivity in ohm.mm at 70 C L = submerged cable length in mm W = insulation resistance at 70 C in ohm D1 = d
6、iameter of conductor, mm D2 = diameter of cable, mm 5. Report the insulation resistance and volume resistivity. The insulation resistance must correspond to a volume resistivity of a minimum of 2 megaohm meters. Chemicals, materials, parts, and equipment referenced in this document must be used and handled properly. Each party is responsible for determining proper use and handling in its facilities.
