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PsyCalc can be used to look up psychrometric properties of an air and water vapor sample. This is done in the PsyCalc Mode:
The steps to find a new set of psychrometric properties are:
1. Select the Input and Output Psychrometric Properties
2. Enter the Input Values
Enter two psychrometric property values corresponding to the input units you have chosen. Enter the altitude or pressure value corresponding to the Altitude/Pressure units you have chosen. All input values have a white background and appear in the upper section of the PsyCalc screen. Each time a change is made to any of these values or units selection the output values at the bottom of the screen are recalculated immediately. Sometimes when changing units you will receive an "Exceeds Limits" message and all output values will appear as zeros. Simply adjust the input values for the new set of units to a combination that fit within PsyCalc's input limits. See the Help topic "Program Limits and Accuracy" for more details
Each Input Value also has a "Spin Button" to its right. Input values can be changed by using the Spin Buttons or by directly typing new values into the input boxes. Spinning past the program's limits causes the outputs to go to zeros and the "Exceeds Limits" message to be displayed. Just spin back in the other direction to return to the PsyCalc's operating range.
PsyCalc can display two or four output values. Changing between two and four outputs is done by choosing the appropriate option in the menu under Edit. Using two outputs saves screen space, while four outputs simply provides more information.
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