Keysight U1251B Guia Del Usuario página 149

Calibration Interval
A 1-year interval is adequate for most applications. Accuracy specifications are
warranted only if adjustment is made at regular calibration intervals. Accuracy
specifications are not warranted beyond the 1-year calibration interval. Keysight
does not recommend extending calibration intervals beyond 2 years for any
application.
Adjustment is recommended
Specifications are only guaranteed within the period stated from the last
adjustment. Keysight recommends that readjustment should be performed during
the calibration process for best performance. This will ensure that the U1251B/
U1252B will remain within the specifications for the next calibration interval. This
criterion for the re-adjustment provides the best long–term stability.
Performance data are measured during the Performance Verification Tests but
this does not guarantee that the instrument will remain within these limits unless
the adjustments are performed.
Refer to the section
all the adjustments have been performed.
Keysight U1251B and U1252B User's and Service Guide
"To Read the Calibration Count"
Performance Tests and Calibration
on page 175 and verify that
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