| ASTM D 257 :
Standard Test Methods for DC Resistance or
Conductance of Insulating |
|
Materials
These test methods
cover direct-current procedures for the determination of
dc insulation resistance, volume resistance, volume
resistivity, surface resistance, and surface resistivity
of electrical insulating materials, or the corre-sponding
conductances and conductivities.
These test methods
are not suitable for use in measuring the electrical
resistivity/conductivity of moderately conductive
materials. Use Test Method D 4496 to evaluate such
materials.
The test methods
and procedures appear in the following sections :
| Test Method or Production |
Section |
| Calculation |
13 |
| Choice of apparatus and test
method |
7 |
| Cleaning solid specimens |
10.1 |
| Conditioning of specimens |
11 |
| Effective area of guarded
electrode |
X2 |
| Electrode systems |
6 |
| Factors affecting insulation
resistance or conductance measurements |
X1 |
| Humidity control |
11.2 |
| Liquid specimens and cells |
9.4 |
| Precision and bias |
15 |
| Procedure for the
measurement of resistance or conductance |
12 |
| Referenced documents |
2 |
| Report |
14 |
| Sampling |
8 |
| Significance and use |
5 |
| Specimen mounting |
10 |
| Summary of test methods |
4 |
| Terminology |
3 |
| Test specimens for
insulation |
Volume and surface
resistance or conductance |
| Determination typical
measurement methods |
X3 |
|
