ECOTEST DKG-21 Operating Manual page 57

5.2 Verification
5.2.1 The DKG-21 dosimeter should be verified during use and after repair.
IMPORTANT!
Devices used in the automated dosimetry control system and are handed
over for verification must be unlocked as regards the prohibition of access
to all their modes of operation (indication of individual dose equivalent,
individual dose equivalent rate, programming of alarms triggering by
threshold levels of individual dose equivalent and its rate).
5.2.2 The interval between verifications should not exceed 12 months.
5.2.3 Verification operations are presented in Table 5.2.
Table 5.2 - Verification operations
External examination
Testing
Operation name
55
Verification
technique No.
5.2.7.1
5.2.7.2