{"id":3434,"date":"2024-10-16T17:30:14","date_gmt":"2024-10-16T17:30:14","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/astm-d257-2007\/"},"modified":"2024-10-24T10:15:02","modified_gmt":"2024-10-24T10:15:02","slug":"astm-d257-2007","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/astm\/astm-d257-2007\/","title":{"rendered":"ASTM-D257 2007"},"content":{"rendered":"<\/p>\n

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.<\/p>\n

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.<\/p>\n

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.<\/p>\n

1.4 The procedures appear in the following sections:<\/p>\n

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.<\/p>\n

PDF Catalog<\/h4>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
PDF Pages<\/th>\nPDF Title<\/th>\n<\/tr>\n
1<\/td>\nScope
Referenced Documents
Terminology <\/td>\n<\/tr>\n
2<\/td>\nSummary of Test Methods
Significance and Use <\/td>\n<\/tr>\n
3<\/td>\nElectrode Systems
FIG. 1
FIG. 2 <\/td>\n<\/tr>\n
4<\/td>\nFIG. 3
FIG. 4
FIG. 5 <\/td>\n<\/tr>\n
5<\/td>\nFIG. 6
FIG. 7 <\/td>\n<\/tr>\n
6<\/td>\nChoice of Apparatus and Test Method
FIG. 8 <\/td>\n<\/tr>\n
7<\/td>\nTABLE 1 <\/td>\n<\/tr>\n
8<\/td>\nFIG. 9
FIG. 10 <\/td>\n<\/tr>\n
9<\/td>\nSampling
Test Specimens
TABLE 2 <\/td>\n<\/tr>\n
10<\/td>\nSpecimen Mounting
Conditioning
Procedure
Calculation
Report <\/td>\n<\/tr>\n
11<\/td>\nPrecision and Bias
Keywords
X1. FACTORS AFFECTING INSULATION RESISTANCE OR CONDUCTANCE MEASUREMENTS
X1.1
X1.2
X1.3 <\/td>\n<\/tr>\n
12<\/td>\nX1.4
X1.5
X1.6
X1.7 <\/td>\n<\/tr>\n
13<\/td>\nX1.8
X1.9
FIG. X1.1 <\/td>\n<\/tr>\n
14<\/td>\nX2. EFFECTIVE AREA OF GUARDED ELECTRODE
X2.1
X2.2
FIG. X1.2
FIG. X1.3
FIG. X1.4 <\/td>\n<\/tr>\n
15<\/td>\nX3. TYPICAL MEASUREMENT METHODS
X3.1
X3.2 <\/td>\n<\/tr>\n
16<\/td>\nX3.3
X3.4
X3.5
FIG. X3.1 <\/td>\n<\/tr>\n
17<\/td>\nX3.6
X3.7
REFERENCES <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

D257-07 Standard Test Methods for DC Resistance or Conductance of Insulating Materials<\/b><\/p>\n\n\n\n\n
Published By<\/td>\nPublication Date<\/td>\nNumber of Pages<\/td>\n<\/tr>\n
ASTM<\/b><\/a><\/td>\n2007<\/td>\n18<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":3435,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[476,2637],"product_tag":[],"class_list":{"0":"post-3434","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-29-035-01","7":"product_cat-astm","9":"first","10":"instock","11":"sold-individually","12":"shipping-taxable","13":"purchasable","14":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/3434","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/3435"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=3434"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=3434"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=3434"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}