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Silicon Designs accelerometer modules respond to the Earth’s gravity
and should show approximately 1g of input when stationary and laid
flat. It’s possible to use this capability to do a static
calibration of the device.
You will Need:
In addition to the equipment listed above, you will also need the accelerometer’s data sheet and a calculator.
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Figure A
Figure B | For
this example we will be using a Silicon Designs 2260-025, however these
instructions will work for all Silicon Designs modules.
Connect your accelerometer according to the instructions in the Quick Start Guide.
In this example we are using a 9 Volt DC battery, which falls within the +8 to +32 Volt DC range supported by the 2260.
Place the module in the +1G position (lid up) and check the output voltage (Figure A).
Place the module in the -1G position (lid down) and check the output voltage (Figure B).
Calculate the 0G Bias
½ x (+1G reading + -1G reading)
This 2260 measures ½ X (.199 + -.124) = .0375
Calculate the Scale Factor
½ X ([+1G reading] - [-1G reading])
This 2260 measures ½ X (.199 - -.124) = .1615
Calculate the Sensitivity
The
data sheet will provide the sensitivity, but the math for figuring out
sensitivity is simple. Take the accelerometer’s output range
value, for example ±4V, and convert to mV, in this case 4000 mV.
Divide that mV number by your sensor’s g range, in this case 25g, so
4000/25 = 160mV. This means that 1 g of acceleration equals 160
mV of output and +/- 1g would be 320 mV.
In this example, the
readings were .199 and -.124. Add them together and |.199| +
|-.124| = .323 Volts DC or 323mV for the entire +/- 1g range. |
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