The ECG is the most commonly performed cardiac test. This is because the ECG is a useful screening tool for a variety of cardiac abnormalities; ECG machines are readily available in most medical facilities; and the test is simple to perform, risk-free and inexpensive.

* Input circuit: isolated, protection against pace making and defibrillation
* Input circuit current: ≤50nA
* Input impendance: ≥50M ohm
* Skin voltage tolerance: ±300mV
* Calibrating voltage: 1mV ±3%
* Sensitivity:5,10,20mm/Mv
* Filter AC: 50Hz(-20dB); EMG:35-45Hz(-3dB)
* Paper speed: 25,50mm/s ±3%
* Patient leakage current: ≤10uA
* Frequency Response: 0.05-150Hz (-3dB)
* Time constant: ≥3.2s(0, +20%)
* Noise level: ≤15uV P-P
* CMRR: ≥100dB
* Baseline drift: ≤0.3mm
* Printer: stylus
* Recorter range: ±20mm
* Linearity tolerance: ±5%
* Sampling rate: 1ms
* AC Power: 230v/50Hz
* Rechargeable battery: 12V 1.2Ah