Covidien Nellcor GR101704, Service Manual

Page: 143 / 236

Performance Tests
Service Manual 10-21
5.
Press decrement (-) until the button click volume setting displays OFF. Verify there
is no click.
6.
Press increment (+) to increase the button click volume setting to a maximum
value of 100%. Verify the volume increases.
7.
Adjust the button click volume setting to an appropriate audio level for the envi-
ronment in which it is to operate.
8.
Press SAVE CHANGES.
To calibrate analog voltage output
The monitoring system provides analog outputs for saturation, pulse rate, and
the plethysmographic waveform. The output voltage is 0.0 to +1.0 VDC for all
three parameters. The voltage decreases as the values for these parameters
decrease. If no data for a parameter is available, the output voltage for that
parameter is 0.0 VDC.
After the completion of power-on self-test (POST), the monitoring system ini-
tiates an automatic three-step calibration signal. The calibration signal begins
at 0.0 VDC and holds that point for 60 seconds. It increases to 1.0 VDC and
holds that value for 60 seconds. The third part of the calibration signal is a stair
step signal. The stair step signal, begins at 0.0 VDC and increases up to 1.0
VDC in 0.1 VDC increments, each held for one (1) second.
Reference Calculating the Analog Voltage Output , p. 7-17.

Note:
If the monitoring system skips an analog calibration step during this process, repeat
the calibration after power cycling the monitoring system.
1.
Connect the negative lead of a voltmeter to pin 10 and the positive lead to pin 6
of the DB-15 data port connector. Reference
DB-15 Pin Layout , p. 7-5.
2.
Confirm the output voltage is +0.0 ± 0.025 VDC, verifying the analog SpO
2
func-
tion.
3.
Leave the negative lead connected to pin 10 and verify 0.0 ± 0.025 VDC on pins
13 and 14, verifying BPM and pleth functions.
4.
Move the positive lead back to pin 6.
5.
Ensure a full 60 seconds from the beginning of POST has elapsed.