BS EN 60068-2-83:2011 pdf free.Environmental testing Tests—Test Tf: Solderabilitytesting of electronic components for surfacemounting devices (SMD) by the wettingbalance method using solder paste.
BS EN 60068-2-83 zero line:line extended to the time axis of the force experienced by the specimen as indicated by thetest equipment (force sensor) when the specimen is taken out from the molten solder after theend of the measurement.
The specimen is held on a holder suitable to the specimen and is suspended from sensitivebalance. The specimen is immersed into solder paste applied onto the test jig plate，thensolder paste is heated to melt.The resultant of the vertical forces of buoyancy and surfacetension (hereafter, referred to as “acting force”) acting upon the immersed specimen by forcesensor and converted into a signal which is continuously recorded or monitored as a functionof time on recorder.
NOTEThe wetting force can be evaluated only for components of the same shape and size. The absoluteevaluation is not achieved by this method.
There are three methods as described below.The choice of the method shall be specified inthe relevant specification.
a) Quick heating method: The wettability of electrodes of a component is evaluated while the solder paste is melted in a rapid temperature rise.The specimen is immersed in the solderpaste before the temperature rise starts.
b) Synchronous method: The wettability of electrodes of a component is evaluated while the solder paste is melted due to a rapid temperature rise.The ‘specimen is immersed in thesolder paste when the temperature rise starts.
c)Temperature profile method: Solder paste is melted using a similar temperature profile used in production and the wettability of the electrodes of a component is evaluated.
Unless otherwise specified in the detailed specification of the component, the test shall bemade on the specimens as received and care shall be taken not to contaminate thespecimens by fingers and other items. The specimen may be immersed in organic solvent atroom temperature to remove possible contamination such as grease attached to the surface ifthe preconditioning is specified in the specification. No other method shall be used to cleanthe specimen.The specimen thus cleaned may be dried in air.BS EN 60068-2-83 pdf download.