Mantracourt Electronics Limited
T24-SAf Fast Strain Gauge Acquisition Module User Manual
9
Battery Life
This page gives guides on achievable battery life.
Note that the battery life calculator is assuming the best case scenario which is at 20°C and that the battery
has a suitable low internal resistance or that a suitable capacitor is fitted across the battery. See battery
details in the Installation section.
Items you can change:
Battery Type
This is not a parameter of the device but information used by the battery life
guide. You can choose from some preset batteries or choose custom to allow
you to select your own battery capacity. See below. This will also offer to
change the Battery Low Level if the level suitable for the chosen battery is not
the level currently set.
Usable Capacity
This is not a parameter of the device but information used by the battery life
guide. This is the capacity of the battery in Amp Hours and has a profound
effect on battery life calculations. This capacity needs to be calculated from
battery manufacturer’s data sheets to take into account that we can only use
batteries down to 2.1 Volts so in the case of twin AA cells this would be 1.05
Volts.
Generally the usable capacity will not be as high as that advertised by the
battery manufacturer. Temperature and internal resistance of the battery are
not taken into account in the guide.
Sensor Impedance
This is only available for certain acquisition modules. This is not a parameter
of the device but information used by the battery life guide. Enter the
resistance of the connected strain gauge in Ohms.
Usage Per 24 Hour Period
Enter the number of hours per 24 hour period that the T24-SAf
will be turned on and communicating.
