EKG AcquisitionQuestion 47 of 100
What does the standardization mark on an EKG tracing indicate when it is 10 mm tall?
a.The machine is calibrated so that 1 millivolt produces a 10 millimeter deflection
b.The paper is running at 10 millimeters per second
c.The patient's voltage is 10 times normal
d.Each large box represents 10 milliseconds
Explanation
Standard calibration is 10 mm per millivolt, printed as a rectangular standardization mark two large boxes tall at the start of the tracing, so that amplitudes can be compared between machines and over time. Paper speed is a separate setting of 25 mm/sec. The mark says nothing about the patient's own voltage, and each large box represents 0.20 second, not 10 milliseconds.
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