Calculating the LSB is fairly easy. You will need to know the resolution of the A/D converter in use i.e. 12bit, 16bit, or 24bit. You will also need to know the full scale (FS) range that you want to calculate the LSB for. Below is an example for a -5 to +5 volt input range with a 16bit A/D converter.
Given:
FS Range = 10 Volts (-5V to +5V), 16bit resolution = 65,356 bits.
Calculation:
Calculation is as follows: 10/65536 = 0.0001525 volts/bit (153 µVolts/bit)
Conclusion:
So for a ±5 volt input range on a 16 bit DAQ device your LSB would be 153 µVolts.
Question
Jeffrey
Calculating the LSB is fairly easy. You will need to know the resolution of the A/D converter in use i.e. 12bit, 16bit, or 24bit. You will also need to know the full scale (FS) range that you want to calculate the LSB for. Below is an example for a -5 to +5 volt input range with a 16bit A/D converter.
Given:
FS Range = 10 Volts (-5V to +5V), 16bit resolution = 65,356 bits.
Calculation:
Calculation is as follows: 10/65536 = 0.0001525 volts/bit (153 µVolts/bit)
Conclusion:
So for a ±5 volt input range on a 16 bit DAQ device your LSB would be 153 µVolts.
Note this is also known as the bit weight.
Link to comment
Share on other sites
1 answer to this question
Recommended Posts