26 Specifications and Standards Compliance
193
Fetal / Maternal Specifications
Performance Specifications
Ultrasound
Measurement Method Ultrasound Pulse Doppler
Measurement Range US 50 to 240 bpm
Resolution Display 1 bpm
Printer 1/4 bpm
Jitter @ 200 bpm ≤ 3 bpm
Display Update Rate 1 / second
US Intensity Average output power P = (7.4 ± 0.4) mW
Peak-negative acoustic pressure p_ = (40.4 ± 4.3) kPa
Output beam intensity (I
ob
)
(= spatial average - temporal average
intensity)
I
sata
= (2.38 ± 0.59) mW/cm
2
Spatial-peak temporal average intensity I
spta
= (15.0 ± 3.2) mW/cm
2
Effective radiating area @ -12 dB (3.11 ± 0.74) cm
2
Signal Quality Indication Poor Quality Empty
Acceptable Quality Half-full
Good Quality Full
Beat-to-Beat Change (max.) for Ultrasound 28 bpm
US Frequency 1 MHz ± 100 Hz
US Signal range 3.5 µVpp to 350 µVpp @ 200 Hz
US Burst Repetition Rate 3.0 kHz
Duration ≤ 100 µs
US LF Frequency Passband @ -3dB 100 to 500 Hz ± 20%
FMP Signal Range @ 33 Hz 200 µVpp to 40 µVpp
FMP Frequency Passband @ -3dB 10 to 100 Hz
Toco
Measurement Method Strain Gauge Sensor Element
Sensitivity 1 unit = 2.5 g
Resolution Display 1 unit
Printer 1/4 unit
Measurement Range 400 units
Signal Range 0 to 127 units
Maximum Offset Range -300 units
Baseline Setting 20 units
Update Rate Display 1 / second
Printer ~4 / seconds
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