{"id":249863,"date":"2024-10-19T16:28:32","date_gmt":"2024-10-19T16:28:32","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/bs-en-61788-42011\/"},"modified":"2024-10-25T11:41:12","modified_gmt":"2024-10-25T11:41:12","slug":"bs-en-61788-42011","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/bsi\/bs-en-61788-42011\/","title":{"rendered":"BS EN 61788-4:2011"},"content":{"rendered":"

This part of IEC 61788 covers a test method for the determination of the residual resistance ratio (RRR<\/i>) of composite superconductors comprised of Nb-Ti filaments and Cu, Cu-Ni or Cu\/Cu-Ni matrix. This method is intended for use with superconductors that have a monolithic structure with rectangular or round cross-section, RRR<\/i> less than 350, and cross-sectional area less than 3 mm2<\/sup>. All measurements are done without an applied magnetic field.<\/p>\n

The method described in the body of this standard is the \u201creference\u201d method and optional acquisition methods are outlined in Clause A.3.<\/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\n\n\n
PDF Pages<\/th>\nPDF Title<\/th>\n<\/tr>\n
6<\/td>\nEnglish
\n
CONTENTS <\/td>\n<\/tr>\n
8<\/td>\nINTRODUCTION <\/td>\n<\/tr>\n
9<\/td>\n1 Scope
2 Normative references
3 Terms and definitions <\/td>\n<\/tr>\n
10<\/td>\n4 Requirements
5 Apparatus
5.1 Material of measuring mandrel or of measuring base plate
5.2 Diameter of the measuring mandrel and length of the measuring base plate
Figures
\n
Figure 1 \u2013 Relationship between temperature and resistance <\/td>\n<\/tr>\n
11<\/td>\n5.3 Cryostat for the resistance, R2, measurement
6 Specimen preparation
7 Data acquisition and analysis
7.1 Resistance (R1) at room temperature
7.2 Resistance (R2*) just above the superconducting transition <\/td>\n<\/tr>\n
12<\/td>\nFigure 2 \u2013 Voltage (U) versus temperature (T) curves and definitions of each voltage <\/td>\n<\/tr>\n
13<\/td>\n7.3 Correction on measured R2* for bending strain <\/td>\n<\/tr>\n
14<\/td>\n7.4 Residual resistance ratio (RRR)
8 Uncertainty and stability of the test method
8.1 Temperature
8.2 Voltage measurement
8.3 Current
8.4 Dimension <\/td>\n<\/tr>\n
15<\/td>\n9 Test report
9.1 RRR value
9.2 Specimen
9.3 Test conditions <\/td>\n<\/tr>\n
17<\/td>\nAnnex A (informative)
\nAdditional information relating to the measurement of RRR (residual resistance ratio) <\/td>\n<\/tr>\n
18<\/td>\nFigure A.1 \u2013 Definition of voltages <\/td>\n<\/tr>\n
20<\/td>\nFigure A.2 \u2013 Bending strain dependency of RRR for pure Cu matrix of Nb-Ti composite superconductors (comparison between measured values and calculated values)
Figure A.3 \u2013 Bending strain dependency of RRR for round Cu wires <\/td>\n<\/tr>\n
21<\/td>\nFigure A.4 \u2013 Bending strain dependency of normalized RRR for round Cu wires
Figure A.5 \u2013 Bending strain dependency of RRR for rectangular Cu wires <\/td>\n<\/tr>\n
22<\/td>\nFigure A.6 \u2013 Bending strain dependency of normalized RRR for rectangular Cu wires <\/td>\n<\/tr>\n
23<\/td>\nAnnex B (informative)
\nUncertainty considerations <\/td>\n<\/tr>\n
24<\/td>\nTables
\n
Table B.1 \u2013 Output signals from two nominally identical extensometers
Table B.2 \u2013 Mean values of two output signals
Table B.3 \u2013 Experimental standard deviations of two output signals
Table B.4 \u2013 Standard uncertainties of two output signals <\/td>\n<\/tr>\n
25<\/td>\nTable B.5 \u2013 Coefficient of variations of two output signals <\/td>\n<\/tr>\n
27<\/td>\nAnnex C (informative)
\nUncertainty evaluation in test method of RRR for Nb-Ti <\/td>\n<\/tr>\n
29<\/td>\nTable C.1 \u2013 Uncertainty of each measurement <\/td>\n<\/tr>\n
30<\/td>\nFigure C.1 \u2013 Distribution of observed RRR of Cu\/Nb-Ti composite superconductor <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

Superconductivity – Residual resistance ratio measurement. Residual resistance ratio of Nb-Ti composite superconductors<\/b><\/p>\n\n\n\n\n
Published By<\/td>\nPublication Date<\/td>\nNumber of Pages<\/td>\n<\/tr>\n
BSI<\/b><\/a><\/td>\n2011<\/td>\n32<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":249866,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[285,2641],"product_tag":[],"class_list":{"0":"post-249863","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-17-220-20","7":"product_cat-bsi","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\/249863","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\/249866"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=249863"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=249863"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=249863"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}