Appendix E
Computed Channel Equations
Introduction |
An equation is converted into a stored binary format which is sent to the instrument where the calculations are performed during the processing of each scan. Constants are passed to the instrument as single precision (4 byte) floating point numbers which have a maximum magnitude of 3.402823E38. Calculations and intermediate values in the instrument use double precision (8 bytes) in order to preserve resolution. The resulting computed channel value is a single precision floating point number. When the result is >9999.9E+6
The instrument traps math errors such as divide by zero and log (0) and returns a
Computed channel equations must observe the following syntax:
∙White space is allowed, but not required, between symbols.
∙White space and parentheses do contribute to the
∙Alphabetic characters may be in upper or lower case.
The symbols used in the syntax definition have the following meanings:
<> | enclose an element which needs further definition |
{} | enclose elements that may be present zero or more times |
[] | enclose elements that may be present zero or one time |
separates alternative elements |