Sentec SDM, Service Manual

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3 Maintenance/Safety & Functionality Tests
SenTec Digital Monitoring System 37
3.2.9 Speaker (POST)
Switch ON the SDM and verify three signal tones of 0.2 seconds each during the POST.
If the speaker does not sound during the POST refer to
section 4.2.4 "SDM specific
troubleshooting" to further evaluate the problem.
3.2.10 Fan
The fan should briefly activate during POST. The fan should rotate freely and without
causing unusual noises. The fan should rotate without obstruction when you blow into
the fan slits on the rear panel of the SDM (note that the fan needs to be off during this
test).
If the above described functions do not operate properly refer to
section 4.2.4 "SDM
specific troubleshooting" to further evaluate the problem.
3.2.11 Barometric Pressure
Tools  Reference Barometer
Compare the barometric pressure measured by the SDM against a calibrated reference
barometer. The barometric pressure measured by the SDM is displayed in the status
bar if PCO
2
is enabled and if the sensor is in the docking station. The unit (mmHg or
kPa) depends on the setting of the menu parameter "Pressure Unit".
If the difference between the two barometric pressure readings is larger than
± 3 mmHg (0.4 kPa) the SDM has to be repaired. Refer to
section 4.2.4 "SDM specific
troubleshooting" to further evaluate the problem.
3.2.12 Analog Output
Tools  Multimeter

SenTec Test Connector Multipurpose I/O
For a detailed description of the analog output refer to the
Technical Manual for the
SDM. The analog output is part of the Multipurpose I/O Port (see Figure 2 Rear
Panel of the SDM).
Measure the Analog Output voltages for the Pleth Waveform (Pin 1+2), for PR (pin
3+4), for SpO
2
(Pin 5 + 6), and for PCO
2
(Pin 7 + 8) using a voltmeter. To facilitate
the connection of the lead of the voltmeter to the pins, it is recommended to use the
SenTec Test Connector Multipurpose I/O (
see section 8.2 “Testing Accessories and
Spare Parts”) or a 26 pin Mini Delta Ribbon connector (e.g. 3M part no. 10126-
3000VE).
In the menu "Interfaces / Analog Outputs" the parameter range that is attributed to
the 0 to 1 Volt output range can be changed for PCO
2
, SpO
2
, and PR. During
measurements on the patient the voltage differential varies proportionally from 0 to 1
Volt as the pin's parameter varies over the selected parameter range.
Activating the menu function "Calibration Sequence" in the menu "Interfaces / Analog
Outputs" causes for all parameters the output of 1 Volt during 60 seconds, followed
by the output of 0 Volt during another 60 seconds. When the calibration sequence is
running the current output voltage is indicated on the display.