User Manual

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
Power ON/OFF

lights up (approximately 1 second)

turns off (approximately 1 second)
• To extend battery life, the ST05 will automatically turn off after 3 minutes of being idle
(i.e. no button pressed and no input signal). Turning the unit off manually, when not in
use, will prolong battery life.
• 
is below the absolute minimum, and the battery should be replaced.


Red clip
Black clip
Signal wire
Ground
Red clip
Black clip
Signal wire
Signal ground wire

Red clip
Signal wire

Black clip
Ground
One wire (unheated) sensor
Two wire (heated) sensor
Three wire (heated) sensor

CAUTION
T            -
ways connect the test leads to the sensor before starting the engine, and
          
             
         

3.4.2 S
The ST05 is capable of measuring and simulating three of the most common oxygen sen-
sors: Zirconia and Titanium in 1 and 5 Volt systems. It is important to select the right type
of sensor in order to obtain the correct readings when testing an oxygen sensor.
Sensor Type Select
1- Make sure the instrument power is turned on, if not, turn it on by pressing and holding
the power button until the display lights up.
2- Press the
(Sensor Type Select) button momentarily.
3- The alphanumeric display will show the type of sensor selected.
4- To accept the sensor selection, release the button and wait until the alphanumeric
display returns to normal (numeric reading).
5- To select another sensor type either press and hold the
“Sensor Type Select” button
until the desired type is shown on the display, and then release, or press and release
the button until the desired sensor type is shown in the display.

There are no standard connectors or color coding for oxygen sensor wiring. These


attempting to connect the test leads to the sensor wires
 , or
sensor types.



4- Read the output signal of the sensor on the analog bargraph and cross count on the
alphanumeric display
Red clip
Signal wire
Black clip
Ground
