Welch Allyn Medical Diagnostic Equipment Thermometer 690 Manual De Usuario

Verify your Biotech Mode settings (page 11) to verify your device is configured properly. 

If the device accuracy is in question, refer to the Calibration section on page 16. 

If the above two tests do not help or cannot be done, read through the following to help 
diagnose the unit.

Error indications fall into five major categories.

Battery error occurs when the instrument detects the following:

Ambient Temperature errors occur when the ambient probe temperature is 
above 104.0° F or below 50.0° F. During an ambient temperature error, the 
display in the temperature number field shows a capital “A” followed by a 
blinking up or down arrow and a blinking thermometer bulb.

Battery below 
operational range 
(< 3.00v)

Blinking battery frame, b on main 
display, arrow pointing down.

Battery above 
operational range 
(> 5.375v)

Blinking battery frame, b on main 
display, arrow pointing up.

Battery Low 
Warning
(> 3.0v & <= 3.4v)

Single blinking battery segment in 
battery indicator.

Battery levels

Gradual decline in number of 
segments showing in battery 
indicator.