Videoswitch AI-150 - Manual (Page 21)

A
150
Digital Recorder
18
9.1.2 Summer/Winter Time
If this menu item is set to Automatic, the displayed time and date will automatically change
in spring and autumn. If you are in a country with different light saving hours, you can use
this menu item to manually select summer-time (1 hour ahead) or winter-time. The date/time
setting in section 9.1 should not be changed other than to adjust and drift in the timekeeping
of the Ai150.
9.2 Record
9.2.1 Days
Enter here the number of days that you wish images to be retained for before being
overwritten. The Ai150 will automatically calculate the number of images per second
recorded to achieve this.
• More days results in fewer images per second
• Fewer days results in more images per second
The image rate may be viewed at any time using the
INFO-4 screen (see section 8).
Note that the actual number of days retained may vary from the programmed value,
particularly if alarms are used. This is because alarms record at the maximum record rate
and threfore use up hard disc space more rapidly. You may wish to increase the number of
days to allow for this.
The following table shows examples of overall record rates (images per second) for different
numbers of days. An average image size of 18K is assumed (medium quality).
Hard Drive
Capactity
7 days 14 days 31 days
300 12.5 (25) 12.5 (13.8) 6.2
The figures in brackets are the update rates when a single camera is being recorded, using
camera 1 input.
To get the image rate per camera, divide by the number of cameras being recorded.