Eye Strain. When you stare at screens all day, your eyes can get tired. Take a break with the 20/20/20 rule. Look at an object at least 20 feet away for 20 seconds every 20 minutes, says Ivan Schwab, MD, a spokesman for the American Academy of Ophthalmology.
Once you have the dial on your volt meter set to measure voltage, simply touch the black lead to the negative (-) terminal on your battery and the red lead to the positive ( ) terminal on your battery.
RE: using a volt meter to measure duty cycle. If your input signal is a pulse and you know it's peak voltage and it's frequency is below the filtering rate of your DMM, then you can measure the duty cycle by your volt meter. RE: using a volt meter to measure duty cycle.