# Should I use given resolution or calculate resolution based on the max range and number of sig bits?

In ARINC429, Should I use given resolution or calculate resolution based on the max range and number of sig bits given?

ForeExample, to calculate Ambient Static Pressure (Label-203, Equipment ID - 10A),

Given Range (Min to Max): 1.5 to 20

Given No of SIG. bits: 11

Given Resolution: 0.016

Calculated Resolution:

MAX RANGE / 2 ^ (No of SIG. bits)
20 / (2^11)
20 / 2048
= 0.009765625.


Question 1: What will be the Ambient Static Pressure value if all the 11 bits are 0.

Question 2: Should I use given resolution or calculated resolution for my LSB value?

In order to provide a range of 1.5 to 20, the label will have an actual range of 0-32, which with 11 significant bits, will provide an actual resolution of $$\frac{32}{2048} = 0.015625$$ (approximated to 0.016 in the ARINC 429 spec)