Chapter 4. Using Special Features
62 Model PM880 Portable Hygrometer User’s Manual
4.8.2e Entering an Equation (cont.)
4. When you have finished entering the equation, press [F3] (OK).
5. Press [F2] (Check) to test the validity of the function. The PM880
displays either “OK” or a message such as “Syntax Error.”
6. Do one of the following:
• To edit the equation, press [ENTER].
• To delete the equation, press [F1] (Delete).
• To confirm the equation and return taking measurements, press [F3]
(Done) and then press
[MENU].
Note: To display the user function on the screen, refer to Displaying
Measurements on page 15. In the Select Measurement window,
choose Userfunction and then the units you entered above.
4.8.3 Setting Up User Tables
To support user-defined functions, the PM880 can hold up to 6 tables of
non-linear or empirical data. Users can enter up to 21 X-Y pairs in each
table. The user functions can supply an X value with Table (X). The meter
then interpolates the Y value for a given X, and substitutes it for Table (X)
in the function. (The results are extrapolated if the X value exceeds the
bounds of the table.) Use the following steps to set up a user table:
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