Hello Doug! 
Ok... I'm a bit confused (which is not hard to do these days...
) 
Are you performing calibrations yourself?
Or, are you looking for some type of criteria to hold external calibration vendors to?
(Sorry, not able to open your attachment at this time).
If you're talking about outside providers, Andy is correct. 17025 is a general standard requirement that most providers should comply with.
Then, you can have non-accredited providers, but have some level of evaluation/ scrutiny that you apply to them (traceability, documentation requirements, etc.).

Ok... I'm a bit confused (which is not hard to do these days...
) Are you performing calibrations yourself?
Or, are you looking for some type of criteria to hold external calibration vendors to?
(Sorry, not able to open your attachment at this time).
If you're talking about outside providers, Andy is correct. 17025 is a general standard requirement that most providers should comply with.
Then, you can have non-accredited providers, but have some level of evaluation/ scrutiny that you apply to them (traceability, documentation requirements, etc.).
I look forward to your response when you are able to review my draft.
I do want to know if a calibration service can be accredited to ANSI Z540-3!?
Thanks!
Doug