11-2
PITCH TONE
The PITCH TONE function refers to the monitor’s capability to vary the pitch of the heart rate
tone or pulse rate tone with the change of the SpO
2
reading. This monitor provides 22 pitch levels.
The pitch rises as the SpO
2
reading increases toward 100% and falls as it decreases. Although the
tone pitch cannot be adjusted manually, the tone volume can be adjusted by one of the following
two ways, depending on the setting of the HR FROM item in the ECG SETUP menu:
îš„ If the HR FROM is set to SPO2 or IBP, you can adjust the PITCH TONE volume by
changing the setting of the PR SOUND item in the SPO2 SETUP or IBP (1,2) SETUP
menu;
îš„ In case of other settings, you can adjust the PITCH TONE volume by changing the setting
of the BEAT VOL item in the ECG SETUP menu.
If the PR SOUND or BEAT VOL is set to 0, the PITCH TONE function will be muted; if the
SpO
2
module is disabled, the PITCH TONE function will be disabled as well.
NOTE
z SpO2 and SPO2 are used interchangeably in this chapter.
11.2 Mindray DS SpO
2
Module
NOTE
z This section is only applicable to the monitor equipped with a Mindray DS SpO2
module.
11.2.1 Principles of Operation
SpO
2
monitoring is a non-invasive technique used to measure the amount of oxygenated
hemoglobin and pulse rate by measuring the absorption of selected wavelengths of light. The
light generated in the probe passes through the tissue and is converted into electrical signals by
the photodetector in the probe. The SpO
2
module processes the electrical signal and displays on
the screen a waveform and digital values for SpO
2
and pulse rate.
The sensor measurement wavelengths are nominally 660nm for the red LED and 940nm for
infrared LED. The maximum optical power output for LED is 4mW.
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