Working principle
Ultrasonic doppler
FEATURES
Fetal heart rate
Measuring position: abdomen of pregnant women
Measurement range: 50-240bpm
Accuracy: ± 1% or ± 1 times / min,take a large value.
Operating mode: continuous wave
Nominal sound working frequency: 2.5MHz.
Ultrasonic output power: < 40mW
The sensitivity: >90dB, at the place 200mm away from the surface of probe
Service time of battery: not less than 60 minutes.
Low power indication: battery symbol flashes
Automatic switch off: no value of fetal heart rate within continuous
two minutes or no key operation
Color:Blue, pink, purple, green
The probe and the main engine are integrated design
High precision FHR LCD digital display
Headphone design, mothers can listen to fetal heart sound on same time
High sensitivity ultrasonic transducer
Low ultrasonic output intensity
Low power consumption
Volume adjustment
Package including
1pc fetal doppler YJ-90C
1pc instruction manual
2pcs*No. 7 batteries(option)
Dimension:
117(L)×57(W)×35(H)mm
Weight(without battery):
80g (including battery)
Power Requirements
2 AAA (No. 7) alkaline battery, 3.0V
Environment Requirements
Ambient temperature: 5℃-40℃
Humidity: 30%-80%
Atmospheric pressure: 60kPa-110kPa
Storage temperature:－20℃ - ＋55℃
Relative storage humidity:10%-93%
