It came from the common crimp contact data sheets, which is what were used to provide most of the pull test data for WHMA/IPC-A-620. I tried to consolidate those by crimp style and common PNs at the time (years ago), but because these are constantly changing, it was impossible. So the terminology was added (at that time) to refer to the contact vendor's data sheets.
There is no way any specification can cover every type and vendor variation of the millions of crimp sockets and contacts used in the industry. The vendor's Technical Data Sheets are typically used for each "family" of crimp specifications and contact specifications. These have a table showing wire gauge range, current carrying capacity, etc., and for each one there is always a listing of the crimp-test pull strength and rate of pull per minute. Some go down into the ROP/second, such as for cell phone connections, etc. The TDS takes precedence over the 620 specification, or at least it should.
Dean

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From: TechNet <[log in to unmask]> On Behalf Of Gumpert, Ben
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Subject: [TN] IPC/WHMA-A-620 - crimp pull force pull-rate

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Technetters,

Does anyone know where the Class 3 pull-rate for crimp pull force testing came from?
It's listed as "?1 inch/minute" but other documents I've looked at have 1 ± 0.25 in/minute. (e.g., AS22520)

Looks like this section was introduced with the 2006 rev A document.


Ben Gumpert