Tech Note 1193 Detail

Troubleshooting: PS-2119 giving negative readings of what is expected.

Affected Products:

PS-2119 PASPORT Acceleration Sensor (3-axis)

Troubleshooting: PS-2119 giving negative readings of what is expected.

PASCO Solution:

Older versions of the PS-2119 will sometimes give the negative of the true acceleration for the sensor. The older versions of the PS-2119 can be identified by the red LED behind the "Fast/Slow" sampling rate button. Unfortunately, the firmware on these sensors cannot be updated to have a fix for the sign on the acceleration. This can be resolved through the creation of a calculation for the device or the software through which the data is collected.

PS-2000 (no calculations are possible)

PS-2002 (Xplorer GLX)

  1. From the home screen select, the Calculator (F3)
  2. Press the Flag button on the GLX to activate the keyboard.
  3. Using the on-screen keyboard, type the name of the output for the calculation that you will create (e.g. accz)
  4. Press F1 to exit the on-screen keyboard
  5. Press the "=" on the GLX keypad.
  6. Press the "-" on the GLX keypad.
  7. Press the F2 button on the keypad and select the acceleration component that is giving the opposite sign of what is desired.
  8. Press the "check" button on the GLX keyboard.
  9. Press the up arrow once.
  10. Press the F4 button to activate Edit
  11. From the pull down menu select "Data Properties"
  12. From the "Data Properties" menu, you can then assign the correct units to the calculation.


  1. From the home screen, tap on the acceleration measurement that is not giving the correct sign.
  2. Tap "Show" at the bottom of the screen. This will generate a workbook with the acceleration measurement you will be changing the sign on.
  3. Tap on the Device Tools icon (crossed wrench and screwdriver)
  4. Tap the icon for Calculated Data
  5. Using type in the name for the output for the calculation that you will perform. (e.g. accz)
  6. Type "=" and then "(-)"
  7. Select the acceleration by tapping on the "Measurements" icon and choose the correct measurement.
  8. Tap the "Properties" icon.
  9. Tap the Blue icon that is labeled "Units". This will bring up a keybaord so that you can assign the calculation the proper units.
  10. Tap the icon "OK"
  11. You will now be able to select the corrected measurement through the Calculated Data section in the build screen or in the display options.

Creation Date: 12/5/2012
Last Modified: 12/5/2012
Mod Summary: