Some medical equipment, particularly those with therapeutic energy output (e.g. defi brillators,
electrosurgical units, physical therapy stimulators, etc.), needs to be calibrated periodically. This
means that energy levels are to be measured and if there is a discrepancy from the indicated
levels, adjustments must be made until the device functions within specifi cations. Devices that take
measurements (e.g. electrocardiographs, laboratory equipment, patient scales, pulmonary function
analysers, etc.) also require periodic calibration to ensure accuracy compared to known standards