[Product GDX-Q]
Specifications and User Guide


  • Press the power button on the sensor to turn it on. (The red LED will flash.) Start the Graphical Analysis or Graphical Analysis Pro app on your device and select the sensor from the list of available sensors. (The green LED will flash.)
  • If the sensor is not working when connected by USB, it may be the cable that is bad and not the sensor. Try a cable from a working unit.
  • If the sensor is not turning on, try charging the sensor for 2 hours and try again.
  • Zero the sensor by connecting the red and black alligator clips together or to a common ground. Press the zero (Q = 0) button and hold it in for several seconds. This discharges the internal capacitors so that the two terminals are at equal potential. The reading should become very close to zero (It is OK for the reading to be a little above or below zero).
    Disconnect the alligator clips from each other and connect the black cable to ground and the the red cable to a separate conductor such as the Faraday pail from [Product ESK-CRG]. Bring a charged object near to this conductor (e.g. inside the Faraday pail) and you should see a reading from the sensor that is alike to the charge on the charged object.

If the Go Direct Static Charge Sensor fails troubleshooting, please contact Vernier Technical Support.

-order code: GDX-Q
-Range: ±100 nC (±10 V)
-Maximum input: ±150 V
-Typical bias input current: 0.003 pA
-Instrument time constant: 0.1 s

If the sensor can be turned on when connected by USB but not when disconnected from USB, it is likely that the battery just needs to be charged. In this case, charge the sensor for several hours and try again. If, however, the sensor won’t turn on regardless of whether the USB cable is connected or not, and you are confident that the USB cable is good by having tested it on another sensor, then the battery has likely reached its end of life and can no longer hold a charge. In this state, the sensor cannot be used even if connected by USB, so the battery will need to be replaced. The rechargeable battery in this sensor is covered by a one year warranty but should last two to five years in typical use. Note that if the battery is less than one year old and the sensor cannot be turned on even when connected by a working USB cable, another possibility is that the USB port is bad. In this case, contact Vernier technical support for assistance.