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Explanation: Without further context, it is hard to say if your sentence refers to a fixed element, i.e. measuring chain guard or if (test) personnel should implement a device or measure to guard the measuring chain from inadverent contact.
Usually Abdeckung can be rendered as:
guard, shroud, cover, enclosure
Anthony Frey United States Local time: 02:11 Native speaker of: English PRO pts in pair: 444
Explanation: It seems highly likely to me that the abstract sense of "Kette" is meant here. So far everyone has been taking it literally.
A "Messkette" is a measurement chain, e.g. a sequence of sensors, transmission lines, data acquisition devices, etc.
So I think "Kette" means "chain" or "sequence" here.
The meaning in your context is that testing should cover the full extent of the measurement chain or sequence.
rjbemben Local time: 02:11 Native speaker of: English PRO pts in pair: 329