PASCO PS-2128 Visual Accelerometer - Manual (Page 6)

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Model No. PS-2128 Visual Accelerometer
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Note: If the unit ever fails to turn on or off using the push-button
switch, open the case and remove any battery for a few seconds, then
reinstall. The unit should operate normally.
Battery Life and Power
The unit has a internal timer that will automatically turn power off
after three hours, even if the unit is being used at the time. To resume
operation, just press the black push button (also called the ON/ZERO/
OFF button).
When the unit is powered from a USB port or hub, the unit cannot be
turned off and the 3-hour automatic-off feature stops functioning.
When you disconnect the unit from USB power, the push button on-off
and auto-off timer functions operate normally.
When the Accelerometer is turned off, it draws only a fraction of a
milliamp from the batteries. Under intermittent operating conditions,
battery life is 6-9 months (with the batteries installed). If you do not
expect to use the unit for several weeks, always remove the batteries;
this can increase the battery life to years and reduce the risk of leaky
batteries damaging the unit.
With battery-powered operation, a battery test occurs every time you
turn on the Accelerometer and release the button. If the battery test is
okay, you will see the green and red lights turn briefly on and off. (If
the red and green lights continue to alternately flash for a few seconds,
you have a low battery condition). (Note: If the Accelerometer is
connected to a USB Link or Xplorer and turned on, the battery test
does not occur.)
Turning off the Visual Accelerometer
Fig. 2a Fig. 2b
Step: Press and hold the black
button until two red and two green
lights illuminate.
Result: When you release the
button, the sensor turns off.
Note: Always fasten the
Visual Accelerometer to a
steady base, such as a
dynamics cart, to prevent
noise from the LEDs
(light-emitting displays).