6-16 120 Series Maternal/Fetal Monitor Revision B
2015590-001
Functional Checkout Procedure: Ultrasound Test
Ultrasound Test
This portion of the functional checkout procedure ensures the integrity of the
ultrasound circuitry and the heart rate channel of the recorder.
1. Connect the simulator’s US sub-cable to the
US receptacle on the monitor.
2. Set the switches on the Model 325 Input Simulator according to Table 6-3.
3. If not already on, depress the monitor’s
Record pushbutton.
4. Turn the simulator’s
Manual Adjustment knob to input an ultrasound signal of
approximately 120 BPM. Verify the following on the monitor:
îš‹ The FHR1 value is 120 BPM.
îš‹ The FHR1 mode is US.
îš‹ The FHR1 heartbeat indicator ( ) flashes at a rate of 120 times per minute.
îš‹ Ultrasound audio volume from the rear panel speaker can be increased or
decreased using the left pair of
Volume pushbuttons. (Set the volume to
the desired level.)
îš‹ The recorder prints a continuous line at 120 BPM on the top grid of the
strip chart paper.
îš‹ The recorder prints the message US on the center margin of the strip chart
paper after approximately 20 seconds.
5. Use the simulator’s
Manual Adjustment knob to increase the heart rate value
by less than 13 BPM from the 120 BPM baseline. Verify the following on the
monitor:
îš‹ The FHR1 value immediately reflects this new input rate.
îš‹ The strip chart recorder immediately reflects this new input rate.
6. Use the simulator’s
Manual Adjustment knob to decrease the heart rate value
by more than 13 BPM from the 120 BPM baseline. Verify the following on the
monitor:
îš‹ The FHR1 value immediately reflects this new input rate.
îš‹ The strip chart recorder prints at the last input rate for an additional 3
seconds before blanking the heart rate data and printing a continuous line at
the new input rate.
7. Set the simulator’s
US Rate switch to the RAMP position. Verify that the FHR1
value counts between approximately 50 and 210 BPM and that the recorder
prints a ramp between the same values. (Refer to Figure 6-6.)
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