GE PM880 - Entering Constants and User Functions

Chapter 4. Using Special Features
54 Model PM880 Portable Hygrometer User’s Manual
4.7 Entering Constants and User Functions
The PM880 enables you to enter two types of constants, a user constant and
a saturation constant, as well as user-defined functions and tables to
manipulate data.
A user constant is a fixed value that is used to multiply the moisture ppm
value (K
 PPMv). A saturation constant is used to calculate PPMw in
non-aqueous liquids. If you do not know the saturation constant of the
liquid, contact the factory.
To extend programming capability, user functions enable you to program up
to 8 mathematical equations. The PM880 also enables you to enter up to
6 tables of non-linear or empirical data to support user function equations.
This section consists of the following information:
• Entering a User Constant - page 55
• Entering a Saturation Constant - page 56
• Entering User Functions - page 58
• Setting Up User Tables - page 62