Vaisala Spectrum 4.0 - Manual (Page 31)

Veriteq Spectrum 4.0 User’s Guide
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If desired, use the Preset button to automatically set the start time hours
and minutes to the earliest possible setting for the date selected. For any
day other than the current day, this value is 12:00AM.
You can use the Start at specified time option in conjunction with the Stop at
specified time option to create a pre-defined data logger monitoring period.
Setting the Stop Mode
The Stop Mode enables you to choose how the connected data logger operates
once the memory is full, or when a specified time is reached.