BS 5142:1974

Cooperating organizations
Foreword
Specification
1. Scope
2. Definitions
3. Classification
4. Operating temperature range of standard cells
5. E.M.F. of standard cells
6. Permissible deviation of e.m.f. over one year
7. Test conditions for certification
8. Requirements for the electrical and mechanical
    characteristics
9. Transport and storage
10. Markings and symbols
Appendix
Tables
I. Class indices for standard cells
II. Permissible e.m.f. deviation over one year
III. Tolerance on stabilization and measurement
     temperature
A.I Limit of permissible change in e.m.f. during
     temperature cycling

Specifies definitions, classification, operating temperature range, e.m.f., permissible deviation of the e.m.f., test conditions for certification, electrical and mechanical requirements, transport and storage requirements and markings and symbols for saturated and unsaturated standard cells. An appendix gives test conditions for determining the temperature-hysteresis effect.

1.1 This recommendation applies to the following two types of standard cells used as electromotive force (e.m.f.) references, viz.:

• — saturated standard cells;
• — unsaturated standard cells.

1.2 This recommendation does not apply to:

• — cells used as international or national standards of e.m.f.;
• — assemblies consisting of a temperature-controlled enclosure containing one or more standard cells;
• — sources of e.m.f. intended to supply a current.