Go Direct^® Current Probe (GDX-CUR)
Specifications and User Guide

TROUBLESHOOTING
Primary Test: Connect the probe a device via Bluetooth or USB and start the data collection software. Connect the probe’s wire leads to a DC supply in series with a known resistance. Use a voltage probe or voltmeter to measure the voltage of the supply. Compare the measured current against the current calculated from Ohm’s Law. We recommend a battery for this test, since some DC power supplies may not deliver clean DC voltage.

RELATED ARTICLES
The readings from my Current and/or Voltage Probe are erratic, but if I measure the voltage with a multimeter instead, I get a solid reading. What is wrong with my sensor?
How can I measure currents outside the range of the Vernier Current Probe?
How do I measure currents larger than 0.6 amperes?
Is the Go Direct Current Probe protected against short circuits?

SPECIFICATIONS
Ranges: +/-1 A and +/-0.1 A
Maximum voltage on any input: +/-10 V
Maximum non-damaging current: 1.5 A and 0.5 A
Input impedance (between inputs): 0.1 Ω
Input impedance (to ground): 10 MΩ
Linearity: 0.01%
Resolution: 0.031 mA (+/-1 A range) and 0.003 mA (+/-0.1 A range)
Battery: 300 mA Li-Poly
Battery life (single full charge): ~24 hours
Battery life (long term): ~500 full charge cycles (several years depending on usage)

CALIBRATION
The Go Direct Current Probe cannot be calibrated. However, you may consider “zeroing” the sensor before the start of an experiment. This is done by shorting out the leads of the sensor, then choosing the Zero option in the data-collection software.

BATTERY TROUBLESHOOTING
If the sensor can be turned on when connected by USB but not when disconnected from USB, the battery either needs charging or has reached its end of life and can no longer hold a charge. First, try charging the sensor for several hours. If the sensor still won’t turn on when disconnected from USB, the battery has likely reached its end of life. If you intend to use this sensor wirelessly, 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.

RELATED VERNIER PRODUCTS
Go Direct^® Voltage Probe (GDX-VOLT)
Vernier Circuit Board 2 (VCB2)