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For each maximum value (“EVT” in the graphical user interface) of the
transients, a frequency is estimated using a zero-crossing algorithm, see
description of this in section 3.2.2.
3.2.4. Overload Handling
If analog or digital overload occurs in one or more samples during an
interval period, the interval value of that interval period is tagged with an
overload flag. Similarly, if analog or digital overload occurs in one or
more samples during recording of a transient, the corresponding transient
will be tagged with an overload flag. In this way INFRA Net can indicate
possible overload in its interval and transient data reports.
Overload is indicated in the display with a “>” before the value.
3.3. Data Storage
C22 follows the data storage model for the new generation of Sigicom’s
INFRA instruments. Although data files are accessible through the USB
interface (see section 5.8.5), data is only readable after post-processing
through INFRA Net.
3.3.1. Transient Data
In INFRA Net it is possible to override the default setting, and filter
according to another measurement standard. INFRA Net includes all
implemented standard filters.
3.4. Additional Hardware
3.4.1. Humidity Sensor
The C22 is equipped with a humidity sensor. A warning message is sent
to INFRA Net if the relative humidity becomes higher than 95%. The last
measured value of the humidity can be read in the GUI, by selecting
Instrument status in the Menu, see section 5.8.
3.4.2. GPS Receiver
The C22 is equipped with a GPS receiver to locate the position of the unit
and is activated after the start of monitoring. The position data is
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