Значение и использование

Electrical tests, properly interpreted, provide information with regard to the electrical properties of the insulation. The electrical test values give an indication as to how the insulation will perform under conditions similar to those observed in the tests. Electrical tests may provide data for research and development, engineering design, quality control, and acceptance or rejection under specifications.

Область применения

1.1 These test methods cover procedures for electrical testing of thermoplastic insulations and jackets used on telecommunications wire and cable and for the testing of electrical characteristics of completed products. To determine the procedure to be used on the particular insulation or jacket compound, or on the end product, reference should be made to the specification for the product.

1.2 The test methods appear in the following sections of this standard:

Test MethodSections Electrical Tests of Insulation—In-Process4-8 DC proof test8 Insulation defect or fault rate7 Spark test6 Electrical Tests of Completed Wire and Cable9-51 Attenuation24 Attenuation, effects due to aging31 Attenuation, effects due to elevated temperature29 Attenuation, effects due to humidity30 Attenuation to crosstalk ratio—far end (ACR-F)28 Attenuation to crosstalk ratio—near end (ACR-N)26 Capacitance deviation19 Capacitance difference20 Capacitance unbalance, Pair-to-ground (CUPG)22 Capacitance unbalance, Pair-to-pair (CUPP)21 Capacitance unbalance, Pair-to-support wire23 Characteristic Impedance—Method 1 Propagation constant
and capacitance47 Characteristic Impedance—Method 2, Single-ended
measurements48 Characteristic Impedance—Method 3 Least Squares Function Fit49 Coaxial capacitance (capacitance to water)17 Conductor continuity11 Conductor resistance (CR)13 Conductor resistance unbalance (CRU of pairs)15 Continuity of other metallic elements12 Crosses test (continuity between wires of different pairs)35 Crosstalk loss, far-end27 Crosstalk loss, near-end25 DC proof test, Core-to-internal shield (screen)40 DC proof test, Core-to-shield38 DC proof test, Core-to-support wire39 DC proof test, Internal shield (screen)-to-shield41 DC proof test, Other required isolations42 DC proof test, Wire-to-wire37 Fault rate test (air core only)33 Insulation resistance (IR)32 Jacket voltage breakdown rating test36 Mutual capacitance (CM)18 Mutual conductance16 Phase Constant44 Phase Delay45 Phase Velocity46 Resistance of other metallic cable elements14 Shorts test (continuity between wires of a pair)34 Structural Return Loss and Return Loss50 Unbalance attenuation (conversion losses)51 Voltage surge test43

1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Specific hazard statements are given in Sections 6 and 37.

4.1 In-process electrical tests are used primarily as process control tools in an attempt to minimize the number and magnitude of problems detected at final test of completed cable.

9.1 Electrical tests of completed wire and cable may include verification of some or all of the properties in accordance with Sections 11 through 51.