Qualis Audio Sentine, User Manual, Page: 21 / 108

Installation 15
DC input threshholds configuration
Error threshholds can be set for the DC inputs in the DC Inputs & Tem-
perature settings panel (p. 70).
Date & time configuration
The Sentinel uses a real-time clock to accurately record the timing of
measurements in Coordinated Universal Time (UTC). For it to be able to
store measurement data for later retrieval, it is essential that the clock
be set accurately.
The Sentinel ships with its clock already set. To maintain accuracy, it
synchronizes the clock to a Network Time Protocol (NTP) server. When
times are displayed, they are converted to the local timezone and day-
light savings setting.
You configure the NTP service and local timezone through the Date &
Time settings panel (p. 73). The timezone can also be set through
the Front Panel menus (p. 19), and you can manually set the clock
through the menus if, for some reason, you're not able to use an NTP
server.
Log repository configuration
The Sentinel logs all sampled audio characteristics and all measure-
ments. It stores up to 25 hours of this data internally. However, mea-
surement data is stored in volatile memory and will be lost in the event
of a power failure. To preserve and access the data, it must be down-
loaded from the Sentinel to a storage repository. Once data is in the
repository, it is protected from loss, and you can use the user interface
to review and display it in the same way as live readings.
The Sentinel stores the log repository in a local directory on your sys-
tem, or a directory on a shared network filesystem. The simplest way
to create and update the repository is to let the user interface do it
from your browser. You need to do this to ensure the user interface has
access to all logged readings.