Calculating Relative Humidity
Before calculating relative humidity, set the Temperature parameter to the current temperature; this value is assumed to be the dry bulb temperature.
Click the Options button and then click Calc Relative Humidity to open the Calculate Relative Humidity dialog box.
Enter the wet bulb temperature into the corresponding edit box. Click the Calculate button to calculate and display relative humidity without returning to the trace window. Click the Apply button to calculate relative humidity and return to the trace window with the calculated value in the Humidity parameter.