EKG Acquisition第 49 / 100 题
How much time and voltage does one large box on standard EKG paper represent?
a.0.04 second and 1 millimeter of height
b.0.10 second and 10 millimeters of height
c.0.20 second and 5 millimeters of height
d.0.50 second and 5 millimeters of height
解析
A large box is five small boxes across and five tall, so it represents 0.20 second horizontally and 5 millimeters, or 0.5 millivolt, vertically at standard calibration. The 0.04 second and 1 millimeter values describe a small box. The 0.10 and 0.50 second values do not match standard paper, where five large boxes equal one second.
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