SONOTRAX(2009) Series Ultrasonic Pocket Doppler User Manual
44
probe faceplate and place the probe against the
abdomen at the predetermined location. Move the
probe around or tilt it until clear and rhythmic
heart sound is heard from the headphone or
speaker. At the same time, a numeric FHR is
displayed on the LCD (except SONOTRAX Lite).
If the Doppler works in mode 1, the numeric is the
real-time heart rate, it changes continuously.
If the Doppler works in mode 2, the numeric is the
average of every 8 heart beats, it changes slowly.
If the Doppler works in mode 3, press the
button once and start counting immediately, viz.
count one at the moment when the button is pressed.
The LCD shows a flashing heart shape symbol and
“---”. Press the button again on the 10
th
count
(after nine beat intervals). The Doppler calculates
and displays the average FHR over the 10 beats. This
rate value will not disappear until another
measurement starts or the mode is changed.
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