Go Direct® Voltage Probe (GDX-VOLT)
Specifications and User Guide


When using Go Direct Voltage to measure electric potential, check the following:

  1. Are the leads properly and securely connected? The probe is designed to be used like voltmeter leads. It should be placed across a circuit element.
  2. Disconnect Go Direct Voltage from any power supplies and connect via Bluetooth. Electric “noise” from a power supply, such the computer to which it is connected, can travel along the USB cable connecting it. Connecting to your device via Bluetooth removes that source of noise.
  3. When measuring DC voltages with power supplies, some power supplies do not provide a steady DC signal. If the sensor voltage is fluctuating, try DC source such as a battery. If the sensor reading is correct, the problem may be the power supply.
  4. Is the output appropriate? The differential input range is 20 V. Over-voltage protection is provided so that slightly higher voltages will not damage the sensor. You should NEVER use high voltages or household AC with these probes.



  • Differential input voltage range: 20 V
  • Maximum voltage on any input: 24 V
  • Input Impedance (to ground): 10 MΩ
  • Differential Impedance: >20 MΩ
  • Linearity: 0.01%
  • Resolution, 16-bit: 5 mV
  • Supply current (typical): 9 mA
  • Maximum Sampling Rate: 1,000 samples/s (USB or BLE)

Calibrate? No. The sensor is set to the stored calibration before shipping.

If you wish to calibrate the sensor, you can conduct a two-point calibration. See the user manual for details.

You may also zero the sensor before collecting data, as an alternative to calibration. This is done by shorting out the leads of the sensor, then choosing the Zero option in the data-collection software. This option adjusts the calibration offset but does not adjust the calibration gain.