Shenzhen PM-9000 Express Manual del operador descargar pdf (Pagina 170)

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 SpO2 reading. This monitor provides 22

pitch levels. The pitch rises as the SpO2 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:

•

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;

•

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

SpO2 module is disabled, the PITCH TONE function will be disabled as well.

NOTE

•

SpO2 and SPO2 are used interchangeably in this chapter.

12.2 Mindray SpO2 Module

NOTE

•

This section is only applicable to the monitor equipped with a Mindray SpO2

module.

12.2.1 Principles of Operation

SpO2 monitoring is a non-invasive technique used to measure the amount of oxygenated

haemoglobin 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 SpO2 module processes the electrical signal

and displays on the screen a waveform and digital values for SpO2 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.

12-2

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Shenzhen PM-9000 Express Manual del operador Pagina 170