7
OM-CP-ULTRASHOCK-A & OM-CP-SHOCK300
Trigger Mode and Post Trigger Storage
The OM-CP-ULTRASHOCK-A and OM-CP-SHOCK300 allow the user to enter a shock value which will trigger
the storage of data. In general, consider the use of a trigger as primarily a means of saving storage space by
saving only data which is above a certain value.
To change a trigger in the Omega 4 Software:
1. Click
Properties
or right click the device in the
Connected Devices list.
2. Click to enable/disable triggers for the X, Y and Z
axis and set trigger points. Trigger setpoints are
absolute values.
3. You may also choose between filling all of memory
after a trigger or storing only a fixed number of
samples after a trigger.
For example, if the option to fill memory is selected,
then after the first trigger, all of available memory will
be filled at the selected logging rate. This will consume
the remainder of available storage space for the
selected channel.
If instead, a value of 100 is entered for “trigger sample count”, then a total of 100 data points will be stored
once a trigger occurs. These 100 samples are acquired at the selected logging rate.
The trigger sample count should be chosen carefully because it may gather data points for which we have no
interest. For instance, if 100 were entered and the logging rate were 30 seconds, then 100 data points would
be gathered over a 3,000 second interval. There may be very little relevant information to a shock event which
triggered the logging process.
While the use of a trigger has a significant effect on data storage, it has virtually no impact on battery life.
Battery Life
The OM-CP-ULTRASHOCK-A and OM-CP-SHOCK300
battery life are highly dependent on the mode of
operation which has been selected for the device.
Referring to the Peak and Instantaneous mode
discussion, along with the Trigger discussion, the
following table presents typical battery life, all at 25
°C, for various applications of the product. At 0 °C,
life will be approximately 30% less. At 60 °C, a slight
improvement may be seen but is generally masked by
increased self-discharge of the battery.
SETUP CONDITIONS
COMMENT
BATTERY
LIFE (DAYS)
All channels,
30s logging
Peak
25
All channels,
30s logging
Instantaneous
29
All channels, 1024Hz
24
All channels, 512Hz
24
Temperature, RH,
Pressure (OM-CP-
ULTRASHOCK-A only)
No Shock
> 120
Triggered vs.
Non-triggered
No difference
(but major
storage
differences)
