Certified EKG Technician (CET) Practice Exam 2025 – Comprehensive Test Prep

Calibration of an EKG machine is an essential process that ensures accurate measurements and readings. The correct choice involves using a standardized voltage during calibration. This helps to confirm that the machine's output corresponds precisely to the accepted voltage measurements for electrical signals emitted by the heart.

When the standardized voltage is applied, the deflection on the EKG printout should reflect specific millivolt levels accurately, allowing technicians to verify that the machine is functioning properly and can provide reliable heart signal recordings. This step is crucial for ensuring that subsequent EKGs will yield data that can be trusted for clinical assessments.

Other actions, such as adjusting paper speed, while part of operating the machine, are not directly related to calibrating the accuracy of the EKG readings. Manually measuring heart rate is also essential for analyzing an EKG, but it does not impact the calibration process. Connecting to a computer may involve data management or storage functions, but it is not part of the fundamental calibration procedure necessary for the machine's output accuracy.