Anritsu 682XXB - Manual (Page 70)

4. Record the frequency error value, displayed on
the Frequency Reference, on the Test Record.
5. Wait for 24 hours, then record the current fre-
quency error value on the Test Record.
6. The aging rate is the difference between the two
frequency error values.
7. Record the computed result on the Test Record.
To meet the specification, the computed aging
rate must be <2
´ 10 –8
per day (<5 ´ 10 –10
per
day with Option 16).
3-10 682XXB/683XXB MM
PERFORMANCE INTERNAL TIME BASE
VERIFICATION AGING RATE TEST