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13. Maintenance
The maintenance of the device is recommended no later than 5 years from handover and thereafter regularly at least every 5 years after
the last maintenance.
Should the measurement results deteriorate persistently before reaching a maintenance date, early maintenance of the device is
recommended.
13.1 Check
A test could be carried out, for example, by a parallel measurement with a reference device.
Reasons for premature maintenance may include:
· The device was exposed to temperatures outside the tolerance range for a long time.
· Frequent and extraordinary EMC phenomena
Please note:
The reason for a permanent deterioration of the measurement results may be solely the actual deterioration
of the power quality without the need for premature maintenance.
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