v2.13 Cleverscope CS300 Reference Manual
©Cleverscope 2004-2018 www.cleverscope.com Page 133
19.8 Example - Deriving Energy [Maths]
If the power consumption is varying markedly, we could measure the actual energy consumption, by integrating
the power used over an appropriate period. This can be done with the integrating process applied in the Maths
equation.
Go to the Maths Equation Builder window.
Enter equations as:
Note The Integral Process is now turned on.
.
Go to the Cleverscope Control Panel window.
On the Settings menu, click Analog Names and Units.
In the Maths Graph Units area, change B Units to
J
and
B Name to
Energy
.
Click OK.
The resulting graph has the integral applied:
The B axis has been relabelled to Energy (J),
and shows energy consumed since the start.
The energy use between Markers 1 and 2 is
201.7 mJ – 59.35mJ = 142.4 mJ, used over
39.76ms – 10.00ms = 29.76 ms,
This gives 0.02976/0.1424 s/J.
As a very rough estimate, battery life will be:
Life = 21700 (j) x (0.02976 /0.1424) (s/j) =
4,528 seconds, or 1.26 hours.
You can see here the great flexibility and
reduction in error that can be achieved by
using the mathematical equations, and custom
units, to make the graphs far more meaningful
than the raw measured voltages.
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