TECHNICAL MANUAL
DGG 700 B
58
Block diagram: Signal adaptation
A)
Measurement of the impedance of the patient –
necessary in order to determine the
capacitor charge voltage, also permitting it to be determined if the disposable defibrillation
electrodes or the paddles are correctly placed on the patient.
Measurement of the impedance of the patient (Zp) is carried out by injecting an electrical
signal to the patient through the defibrillation electrodes. This is a 27 KHz sine wave signal,
of 1 mA, in a way that does not affect the patient. It is isolated and it is generated by the
FPGA.
The impedance meter is capable of distinguishing four situations depending on the patient's
impedance:
•
Electrodes in short circuit (Zp <15 Ohms)
•
Patient connected (15
÷
300 Ohms)
•
Electrodes badly connected (300
÷
2000 Ohms)
•
Patient not connected (Zp > 2000 Ohms)
Содержание Reanibex 700
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