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Instructions
Check to make sure the wattmeter is connected properly. A clamp style meter will have a single connector, others will have two clips that must be clipped on positive and negative wires. A radio frequency wattmeter will be connected to the line between an RF receiver and antenna. Refer to the manual to know how to properly connect yours.
Look for a switch that selects AC or DC power. If your wattmeter is designed for both types of current, you will want to adjust this setting to the type of current you want to read. DC is for systems where power is stored in a battery, AC is for systems like those in a house.
Adjust the reading. Some wattmeters are capable of reading electric current in terms of volts, decibels, ohms, and more. If there is a dial or buttons allowing you to select from these types of readings, make sure you have it adjusted to the reading you want.
Adjust forward or reverse. Many wattmeters are able to read the electricity going either in or out of the system. Adjust this setting depending on which you want to measure. Some digital meters are able to measure forward and reverse simultaneously.
Adjust the range. This is to determine the expected range of electricity that will be running through your wattmeter. If your wattmeter has this function, it may be adjusted via a dial, or buttons. If you are using one of a variety of certain types of RF wattmeters, range is adjusted by selecting different inserts which are plugged into the back of the meter. Adjusting the meter to the proper range will allow you to make a more accurate reading. If you do not know the range, adjust the meter to the highest range.