ECGMAC EM-1201, Manual

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Appendix B Product Performance
B.1 External Output
1.1
Sensitivity 1V/mV,Tolerance: ± 5% or 0.5V/mV.
1.2
Impedance of External Output ≤ 100 Ω .
1.3
Output short circuit shall not damage the ECG machine.
B.2 External DC signal Input
2.1 Sensitivity 10mm/V. Tolerance: ± 5%
2.2 Input Impedance ≥ 100k Ω
2.3 Input Impedance Attenuation. By Paralleling impedance of 4700PF capacitor and 620K Ω is
connected to each lead electrode. When achieving the specified value, the impedance should be near
to 2.5M Ω , each uniform resistance should be no less than 600 k Ω .
2.4 Input circuit current: all input circuit currency should be less than 0.1uA
2.5 Calibration Voltage:1mV, tolerance ± 5%
2.6 Sensitivity
2.6.1 Sensitivity control: At least three grade: 5, 10, 20mm/mV. Tolerance
±
5% by shifting
2.6.2 Anti-polarization Voltage : Applying
±
300mV DC polarization Voltage, the tolerance of
sensitivity is ± 5%
2.6.3 Minimum testing signal: Testing the energy of deviated sine signal of 10Hz 、 20 μ V (summit)
2.7 Noise Level
By paralleling impedance of 0.047
μ
F capacitor and 51k
Ω
resistance which is connected between
input terminal and neutral electrode. Within the frequency range of regulation 4.2.10. The noise
level should be no more than 15
μ
V(peak to peak value)
2.8 Anti-interference
2.8.1 The CMRR of each lead should be no less than 89db
2.8.2 ECG represents 10V rejection of common mode signal on patient, according to picture 5
simulation test , each lead is connected with simulation electrode --- Skin none-balance
impedance( paralleling impedance of 51k Ω resistance and 0.047 μ F capacitor) . The recording