Description
Specifications
Ultrasound Mode
- Technique: pulse Doppler with autocorrelation processing.
- Transducer type: 9-crystal.
- Pulse reception frequency: 4 kHz single ultrasound mode, 2 kHz dual ultrasound mode
- Pulse duration: 92 µs
- Transmitter frequency: 1.151 MHz
- Intensity: <5mW/cm2
- Heart rate counting range: 50-210 BPM
- Leakage current: <10 µA at 120-240 VAC, isolated by transducer
FECG Mode
- Technique: peak detecting, beat-to-beat cardiotachometer.
- Heart rate counting range: 30-240 BPM
- Heart rate resolution: ±1BPM
- Artifact elimination: switch selectable, ±25 BPM artifact rejection
- Countable input signal range: 15 µV to 2mV peak-to-peak
- Offset voltage tolerance (differential): ±300 mVDC maximum
- Maximum common mode voltage: 20V peak-to-peak
- Preamplifier bandwidth: 1-100 Hz
- Common mode rejection: balanced > 120 dB at mains frequency, with patient cable, unbalanced = 5k?RA or La: >110 dB at mains frequency
- Input equivalent noise: < 10µV peak-to-peak
- Input impedance: differential > 10 MO, common mode > 20MO
- Mains frequency rejection: > 40 dB
- Leakage current: < 60µA at 254 VAC electrically isolated
- Isolation, mains-to-patient: >4kVAC
- Leg plate tester jack: simulated r-wave at 120 ± 1 BPM
Fetal Alarms (for Ultrasound or FECG Modes)
- Audio: alternating 1.5 second chimes (773 Hz and 523 Hz)
- Visual: flashing heart rate numeric
- Limits: user selectable high and low fetal heart rate
- Technical: signal quality
- Tachycardia response time: 5 minutes at 100% limit violation
- Bradycardia response time: 30 seconds at 100% limit violation
- Signal quality response time: 100% signal loss – 1.25 minutes, 70% signal loss – 5 minutes, 65% signal loss – 10 minutes