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Operating Principle
EKG is similar to EMG: The sensor detects and amplifies the small electrical voltage that is generated by the heart muscle when it contracts.

Measurement Unit
The actual EKG signal is measured in microvolts (μV). Most often, though, the clinically useful measures are those that are computed from the raw EKG: the heart rate (HR) and its inverse, the inter-beat interval (IBI). HR is measured in beats per minute (B/min or Bm) and IBI, in< milliseconds (ms).

EKG Sensor Specifications (SA9306M)
Size (Approx.) - 37mm x 37mm x 12mm (1.45" x 1.45" x 0.45")
Weight (approx.) - 25g (1oz)
Input Impedance - 10GΩ in parallel with 10pF
Signal Input Range - 0 –12mVRMS
Sensitivity - <1μVRMS
CMRR - >130dB
Channel Bandwidth - 0.05Hz – 1kHz
Signal Output Range - 0 – 600mVRMS
Input/Output Gain - 50
Supply Voltage - 7.26V (± 0.05V)
Current Consumption - <1.5mA
Accuracy - ±3μVRMS ±5% of reading @25°C to 30°C

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USA Federal law restricts this device to sale by or on the order of a physician or any other practitioner licensed by the law of the state in which he or she practices to use or order the use of this device.