EKG machines tests for problems with the electrical activity of the heart. EKG machines translate the hearts electrical activity onto paper. EKG machines are also known as an electrocardiogram or ECG. EKG machines basically monitor the heart and are used as part of physical examinations or tests at hospitals and clinics. The function of the EKG machine depends on the ability of the heart to produce electrical signals. EKG equipment is often portable, so the test can be done almost anywhere. If you are in the hospital, your heart may be continuously monitored by EKG equipment. EKG machines are made up of a large variety of EKG products including semiconductors, test equipment, and closed circuit TV systems. EKG products provide useful data and can help detect various problems related to heart function.