AOIP CALYS 1500 Mode D'emploi page 111

7) Confirm the update by pressing "OK" and wait for the firmware to load into the unit.
A.5.2 Recalibration
In order to maintain the quality of measurement, the user may wish to carry out a periodical performance check himself.
This check must take into account the metrological precautions for use. The following instructions must be followed.
The operations must be carried out under the reference conditions, namely:
Ambient temperature: 23° C ± 1° C.
Relative humidity: 45% to 75%.
The standards used in the test process must be such that the errors at the test points are known and are less than or
equal to ± 0.005%.
After these checks, if it is found that one or more of the characteristics of the unit are outside the tolerances given in
chapter D, one may:
Either make an adjustment in accordance with the procedure explained below, which requires equipment at least
as accurate as that used for the test previously performed.
Or return the unit to the address shown at the start of this guide for checking and adjustment.
It is possible to adjust the CALYS 1500 using an instrument whose accuracy is better than 50 ppm. To adjust the unit,
select the Menu Maintenance menu, then enter the password 9456.
To exit the Maintenance mode, press the End function key.
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