ASTM-D257 2007

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D257-07 Standard Test Methods for DC Resistance or Conductance of Insulating Materials

Published By	Publication Date	Number of Pages
ASTM	2007	18

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Categories: 29.035.01 - Insulating materials in general, ASTM

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Description

1.1 These test methods cover direct-current procedures for the measurement of dc insulation resistance, volume resistance, and surface resistance. From such measurements and the geometric dimensions of specimen and electrodes, both volume and surface resistivity of electrical insulating materials can be calculated, as well as the corresponding conductances and conductivities.

1.2 These test methods are not suitable for use in measuring the electrical resistance/conductance of moderately conductive materials. Use Test Method D 4496 to evaluate such materials.

1.3 This standard describes several general alternative methodologies for measuring resistance (or conductance). Specific materials can be tested most appropriately by using standard ASTM test methods applicable to the specific material that define both voltage stress limits and finite electrification times as well as specimen configuration and electrode geometry. These individual specific test methodologies would be better able to define the precision and bias for the determination.

1.4 The procedures appear in the following sections:

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.

PDF Catalog

PDF Pages	PDF Title
1	Scope Referenced Documents Terminology
2	Summary of Test Methods Significance and Use
3	Electrode Systems FIG. 1 FIG. 2
4	FIG. 3 FIG. 4 FIG. 5
5	FIG. 6 FIG. 7
6	Choice of Apparatus and Test Method FIG. 8
7	TABLE 1
8	FIG. 9 FIG. 10
9	Sampling Test Specimens TABLE 2
10	Specimen Mounting Conditioning Procedure Calculation Report
11	Precision and Bias Keywords X1. FACTORS AFFECTING INSULATION RESISTANCE OR CONDUCTANCE MEASUREMENTS X1.1 X1.2 X1.3
12	X1.4 X1.5 X1.6 X1.7
13	X1.8 X1.9 FIG. X1.1
14	X2. EFFECTIVE AREA OF GUARDED ELECTRODE X2.1 X2.2 FIG. X1.2 FIG. X1.3 FIG. X1.4
15	X3. TYPICAL MEASUREMENT METHODS X3.1 X3.2
16	X3.3 X3.4 X3.5 FIG. X3.1
17	X3.6 X3.7 REFERENCES

Additional information

Standard Title	D257-07 Standard Test Methods for DC Resistance or Conductance of Insulating Materials
Published Code	ASTM
Publication Date	2007
Pages Count	18
ICS Codes	29.035.01 - Insulating materials in general

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ASTM-D257 2007

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