Product User Guide | 7
UltraShock
DEVICE OPERATION
Trigger Mode and Post Trigger Storage
The UltraShock allows 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 MadgeTech 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 UltraShock battery life is 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
No Shock
> 120
Triggered vs.
Non-triggered
No difference
(but major
storage
differences)
