I think you are asking about maintaining the appropriate accuracy ratio. Is that correct?
If so, then in general you are correct. Any instrument you are using to perform calibrations should should be significantly more accurate than what you are measuring (or more correctly, have significantly less estimated uncertainty). The general accuracy ratio is 4 to 1. If you can do better, that's excellent. For some technology and situations, less than 4 to 1 may be permissible.
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