GE HEALTHCARE B20, User'S Reference Manual

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B40/B20 Patient Monitor
2-18
Parameters specifications
ECG specifications
Leads available 3-lead configuration: I, II, III
5-lead configuration: I, II, III, aVR, aVL, aVF and VA
QRS detection range 0.5 to 5mV
QRS detection width (Q to
S) 40 to 120 ms
Defibrillation protection 5000 V, 360 J
Recovery time <5 s
Input impedance Common mode > 10 M Ω @ 50/60 Hz
Differential > 2.5 M Ω from 0.67 to 40 Hz
Common mode rejection 90 dB minimum at 50 Hz
Tall T wave rejection >1.4 mV
ECG leads off detection Active patient electrode: <30 nA
Reference electrode: <300 nA
Filter modes
50/60 Hz
Monitoring filter 0.5 to 40 Hz
ST filter 0.05 to 40 Hz
Dagnostic filter 0.05 to 150 Hz
Heart rate
Measurement range 30 to 300 bpm
Measurement accuracy ±5 % or ±5 bpm, whichever is greater
resolution 1 bpm
Heart rate response time (IEC 60601-2-27 201.7.9.2.9.101 b) 5))
Step increase from 80 to
120 bpm average 6.9 s (6.5 to 7.5 s)
Step decrease from 80 to
40 bpm average 8.2 s, (7.6 to 10.0 s)
The heart rate calculation operates with irregular rhythms of IEC 60601-2-27
201.7.9.2.9.101 b) 4), the heart rate after a 20 second stabilization period is:
Figure 3a 80 bpm
Figure 3b 59 bpm
Figure 3c 122 bpm
Figure 3d 117 bpm
Heart rate averaging computation (IEC 60601-2-27 201.7.9.2.9.101 b) 3)): Average
of 10 second median values
The average time and time range ( ) to alarm (VFib or VTachy) for tachycardia
waveform are as follows (IEC 60601-2-27 201.7.9.2.9.101 b) 6))