GE Eagle 1000, Инструкции по обслуживанию

Страница: 22 / 148

GE Medical Systems EAGLE 1000
Page 22
Information Technologies
Servicing Instructions 227 468 01 Rev.G
• overrange limit (e.g. for polarization voltages) for differential signals >0.6 V, for signals
referred to RL > 1.0 V
• common-mode rejection referred to RL for f<= 50 Hz approx. 80 dB RL referred to
chassis >110 dB
• patient leakage current (rms values): under normal conditions <0.005 mA, in fault condi
tion (e.g. patient in contact with mains voltage) <0.020 mA
• quiescent input current <40 nA
non-destructive load for electrode connections referred to RL ± 50 V, referred to chas-
sis ± 1000 V
• pulse-voltage resistance of all electrode connections and of the RL-connection referred
to chassis (either polarity, e.g. defibrillation, electrocautery) 5000 V
Signal processing
The signal in channel 1 is processed. All specifications refer to a signal free of inter
ference.
Amplification, QRS detection, digitization, display
• HR measuring range 15 to 300 bpm, error ± 1 BPM (EC 13)
• ECG cut-off frequency >=100 Hz
• differential signal range ± 4.5 mV
• ECG resolution 0.005 mV
• sampling rate 1000/1200 Hz
• noise below 0.04 mV
• time constant for ECG transfer 0.3 s (0.5 Hz)
• HR averaging for displayed value: weighted average from the most recent RR intervals
• display update interval: 2 seconds
• trigger sensitivity 0.25 mV to 0.30 mV for pulse width of 40 ms
• max. rate stabilization of 6 seconds for RR interval change of 95%
• alarm delay 4 seconds
• asystole alarm 4 seconds
• 3 signal sizes for monitor display in freeze mode or else on the recorder trace: 5 — 10
— 20 mm/mV
• 1-mV calibration signal on waveform and recorder trace
• detection of pacing pulses (these specifications refer to an ECG signal free of inter-
ference)
— pulse duration d
p
>approx. 0.2 ms, <40 ms
— pace marker independent of polarity
— pulse amplitude a
p
±10 to ±700 mV
— over/undershoot a
o
±1 mV
— time constant t
o
25 to 100 ms