EXFO IQS-1600 High-Speed Power Meter for IQS-500/600 - Manual (Page 115)

Maintenance
High Speed Power Meter 107
Cleaning the Analog Output and External Trigger Ports
Cleaning the Analog Output and External
Trigger Ports
To ensure better performance and higher accuracy, gently wipe the inside
of the analog output and external trigger ports with a ling-free swab dipped
in isopropyl alcohol.
To dry the port after cleaning it, use either compressed air or a dry lint-free
swab.
Recalibrating the Unit
Manufacturing and service center calibrations are based on the
ISO/IEC 17025 Standard, which states that calibration documents must not
contain a recommended calibration interval, unless this has been
previously agreed upon with the customer.
Validity of specifications depends on operating conditions. For example,
the calibration validity period can be longer or shorter depending on the
intensity of use, environmental conditions and unit maintenance. You
should determine the adequate calibration interval for your unit according
to your accuracy requirements.
Under normal use, EXFO recommends calibrating your unit every year.