Basler Electric BE1-11g - Manual (Page 390)

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Note
If verifying the analog measurement circuits by comparison to
independent devices is used, you should ensure that the two devices
use similar measurement algorithms. For example, the measurements
of a fundamental sensing relay cannot be compared with the
measurements of an rms sensing device.
Functional testing is NOT required for this device. It is necessary only
when performing a comprehensive assessment to determine suitability
for an application.
Periodic Testing BE1-11g