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Choosing the input source for collecting readings
From the main program window click the Choose Input yellow button. The following window is shown

If using the sound card to collect readings then select either Microphone or Line-in and click OK. If you have multiple sound cards you can select which one to use.
If using a wattmeter to collect readings then select the appropriate meter. Select the Com port number to which the wattmeter is connected (if any) from the drop-down list and click OK
Please contact the author if you have another type of wattmeter that interfaces to a PC and we will try to support it.