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4.3.4 Button Operation
The four multifunction buttons, Left arrow/Contrast, Waveform/Right arrow, Up arrow/Backlight
and Down arrow/Mute, adjust the monitor’s functions on the monitoring screen.
Contrast Button
If it is pressed continually, the LCD contrast will increase cyclically.
Waveform Button
If it is pressed, the monitoring screen will switch between parameter screen and
waveform screen.
Backlight Button
If it is pressed, the LCD backlight will be turned on or turned off.
Mute Button
It is a main switch of the speaker. No matter what level the pulse sound is and whether
every parameter alarm is switched on or off, when it is pressed, pulse sound and alarm
sound become silence or audible totally.
4.3.5 Alarm Monitoring Function
When a parameter’s measurement exceeds its alarm limit, the monitor can give audio and
visual alarms simultaneously. The speaker sounds the alarm and the parameter’s
measurement flashes on the screen. If the speaker sound is turned off by pressing the Mute
button or the parameter’ alarm switch is set off, the parameter’ alarm sound will be
silenced, but the parameter’s measurement still flashes to prompt the alarm. Please refer
to section 4.4 for parameter alarm switch setup.
The alarm sound has top priority when the speaker is not mute. When there is a alarm
whose switch is set on, the speaker sound the alarm sound but not the pulse sound. Only
when there is no measurement exceeding its alarm limit or its alarm switch is set off, the
speaker sound the pulse sound. The pulse is also indicated by the red colour LED on the
front panel no matter whether the pulse sound can be heard. The alarm sound and the pulse
sound can be heard no matter which screen is displayed.
The icon of the alarm sound on the monitoring screen reflects the status of all alarm
switches. When they are all set off or the speaker is silenced by pressing the Mute button,
the icon shows OFF status and no sound can be heard. Otherwise the icon shows ON status
and the alarm sound will be heard if any parameter’s measurement exceeds its alarm limit.