SONOTRAX Series Ultrasonic Pocket Doppler User Manual
4.5.3 Manual Mode (Mode 3)
When the Doppler works on this mode, the Working Mode on LCD displays 3.
Press START/STOP button once and immediately start counting, count 1 on the moment
when the button is pressed. The LCD displays the flashing heart shape symbol and "---". Press
th
the button again on the 10
count (after 9 beat intervals).
The Doppler automatically calculates the derived FHR averaged over the 10 beat periods and
displays the result. This rate value will not disappear until another measurement starts or the
mode is changed.
4.5.4 Back Light Brightness Setting Mode (Mode 4)
This mode is only for SONOTRAX Basic A/ SONOTRAX Pro/ SONOTRAX II/
SONOTRAX II Pro.
When the Doppler works on this mode, the Working Mode on LCD displays 4.
Press START/STOP button to set the brightness of white back light. "OFF" displayed at the
LCD means the white back light is disabled, while "ON" means the white back light is
enabled.
NOTE: The setting under this mode will be saved automatically after mode
switching or normal power off.
4.5.5 Record Sampling Frequency Setting Mode (Mode 5)
SONOTRAX Pro/ SONOTRAX II Pro Doppler have the build-in function of recording and
playing audio signals, this mode is used to set the record sampling frequency.
When the Doppler works on this mode, the Working Mode on LCD displays 5.
Press START/STOP button, the sampling frequency switches between 4 and 8 on the LCD.
"4" means the frequency is 4KHz, the longest record time is 480 seconds; while "8" means
8KHz, the longest record time is 240 seconds.
NOTE: (1) The setting under this mode will be saved automatically after mode
switches or normal power off.
(2) After changing frequency, the records related to the original
frequency will be cleared automatically.
4.6 Fetal Heart (FH) Monitoring
FH monitoring with 2.0MHz waterproof probe or 3.0MHz waterproof probe
Feel the position of the fetus by hand firstly to find out the best direction to the fetal heart.
Apply a liberal amount of gel to the faceplate of probe; place the faceplate of probe at the best
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SONOTRAX Series Ultrasonic Pocket Doppler User Manual
position for detecting fetal heart. Adjust the probe to obtain an optimum audio signal ideally
by angling the probe around. Adjust the volume according to requirements. Refer to figure
4-6.
Figure 4-6 FH monitoring
The audio fetal heart beat is sent out via the built-in speaker or attached earphone; the FHR
value is displayed on the LCD (except SONOTRAX Lite).
NOTES:
1) The best quality records will only be obtained if the probe is placed in the
optimum position.
2) Positions with strong placental sounds (swishing) or fetal cord pulse
(indistinct pulse at fetal rate) should be avoided.
3) If the fetus is in the cephalic position and the mother is supine, the clearest
heart sound will normally be found on the midline below the umbilicus.
During monitoring prolonged lying in the supine position should be avoided
owing to the possibility of supine hypotension. Sitting up or lateral
positions are preferable and may be more comfortable to the mother.
4) It is not possible to FHR unless an audible fetal heart signal is present. The
fetal pulse can be distinguished from the maternal pulse by feeling the
mother's pulse during the examination.
4.7 Build-in Recording and Playing
This function is only for SONOTRAX Pro/ SONOTRAX II Pro.
Recording: Press the REC/PLAY button and hold for 3 seconds under mode 1, 2 or 3, the
machine starts recording, "RECORDING" will appear on the LCD. The longest record time
depends on the recording sampling frequency set in mode 5. The machine records 480
seconds with 4KHz frequency and 240 seconds signal with 8KHz frequency.
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