Components Standards: General Information

Following is current information regarding the component standards process:

• There are currently four classes of document:

1)  Nomenclature Prints (NP’s) – establish standard nomenclature for loudspeaker component features and correlate the nomenclature to the feature.

 

2)  Dimensioning/Tolerancing Guidelines (DG’s) – establish guidelines for the dimensioning and tolerancing of loudspeaker components, including defining the special characteristics and the tolerance to be applied to each feature. DG's will primarily be used by design (in conjunction with NP's) to help create more standardized prints with reasonable tolerances. A DG is created for each corresponding NP.

 

3)  Measurement Guidelines – establish guidelines for the measurement of loudspeaker components, including defining the most practical and effective equipment for and methods of measurement. MG's will primarily be used by quality/inspection (in conjunction with existing measurement standards and ALMA International Test Methods) to help make more consistent and repeatable measurements. A MG is created for each corresponding DG.

 

4)  Test Methods (TM’s) – establish detailed instructions for component feature measurement. Some of these documents have already been produced by other organizations, so our first effort will be to locate all existing and relevant test methods. However, if none exist for a particular feature measurement, we will create an ALMA International Test Method.

 

• Documents are numbered with their 2-letter abbreviations followed by a sequential 3-digit number.  For example Dimensioning/Tolerancing Guidelines for Spiders is document number DG-004.
• Revisions are indicated by date on approved documents and by “DRAFT” on unapproved documents.
• DRAFT documents can be released with the approval of the author(s) and the sub-committee chair only, while non-DRAFT documents must have sub-   committee approval (e.g. at yearly meetings) for release.
• The goal is to update DRAFT documents on the website every quarter.
• Gage Repeatability and Reproducibility (GRR) information, if known, should be listed at the end of each TM.

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