Comen CM1200B - Page 63

Technical Specifications
III-4
Anti-interference
performance
Common mode rejection ratio: ≥105dB
Electrocardiograph is of the ability to reject a 10V
common mode signal presented on the patient. In
case of unbalanced impedance connected to skin
(51kΩ resistor in parallel with 0.047μf capacitor),
the recording amplitude shall not exceed 10mm
Pacemaker Pulse
Measurement
±2mv~700mv
0.1~2ms
50Hz / 60Hz
interference
suppression filter
≥20db
Accuracy of input
signal reconstruction
System error: ± 5% or ± 40μV, both take the
maximum.
The frequency response of the system is determined
according to the method A and method D or method
A, method B and method C used in EC11.
Reproduction of
calibration voltage
Add an external step voltage (rise time is not more
than 5ms, and amplitude is 1mV ± 0.01mV) to Lead
I, II and V1 ~ V6,and record the waveform
according to IEC 60601-2-25. Error of the
reproduced calibration voltage error is within 5%.
Baseline stability
When the supply voltage is stable: baseline drift
shall not be more than 1mm;
When the supply voltage waves transiently: baseline
drift shall not be more than 1mm;
When sensitivity changes (no signal input), its
displacement does not exceed 2mm;
When temperature drift is in the 5 ℃ ~ 40 ℃, the
baseline drift should not exceed 0.5mm/℃