Vernier Software and Technology
Vernier Software & Technology

Go Direct® Constant Current System User Manual

Go Direct® Constant Current System

The Go Direct Constant Current System is a DC power source with a built-in current probe designed for use in electrochemistry experiments. The user can set the current by tuning the dial. The system is capable of delivering up to 0.6 A. The following is a partial list of activities and experiments that can be performed using this sensor.

  • Electroplating and Faraday’s law
  • Electrolysis
  • Determining Avogadro’s number

Note: Vernier products are designed for educational use. Our products are not designed nor are they recommended for any industrial, medical, or commercial process such as life support, patient diagnosis, control of a manufacturing process, or industrial testing of any kind.

What's Included

  • Go Direct Constant Current System
  • AC power adapter
  • Micro USB Cable

Compatible Software

Getting Started

Please see the following link for platform-specific connection information:

Bluetooth Connection

USB Connection

  1. Install Graphical Analysis 4 on your computer, Chromebook™, or mobile device. See for software availability.
  2. Turn on your sensor by plugging it into the AC power adapter. The Bluetooth® LED will blink red.
  3. Launch Graphical Analysis 4.
  4. Click or tap Sensor Data Collection.
  5. Click or tap your Go Direct sensor from the list of Discovered Wireless Devices. Your sensor's ID is located near the barcode on the sensor. The Bluetooth LED will blink green when it is successfully connected.
  6. Click or tap Done to enter data-collection mode.
  1. Install Graphical Analysis 4 on your computer or Chromebook. If using LabQuest 2, make sure LabQuest App is up to date. See for software availability or to update LabQuest App.
  2. Turn on your sensor by plugging it into the AC power adapter.
  3. Connect the sensor to the USB port.
  4. Launch Graphical Analysis 4 or turn on LabQuest 2. You are now ready to collect data.

Connecting the Sensor

See the following link for up-to-date connection information:

Connecting via Bluetooth

Ready to connect Red LED next to Bluetooth icon flashes when the sensor is awake and ready to connect. At the same time, the red LED next to the power icon is steady.
Connected Green LED next to Bluetooth icon flashes when the sensor is connected via Bluetooth. At the same time, the red LED next to the power icon is on steady.

Connecting via USB

Connected Red LED next to power icon on steady when sensor is connected to Graphical Analysis via USB. LED next to Bluetooth icon off.

Powering the Sensor

Turning on the sensor

Red LED is on steady when connected to AC power.

Putting the sensor in sleep mode

Red LED is off when disconnected from AC power.

Using the Product

Connect the sensor following the steps in the Getting Started section of this user manual.



0 to 0.6 A



Supply Voltage


Supply current (typical)

9 mA

Output voltage range

0 to 5 V

Transfer function

Vout=6.9(I) + 0

Power supply (input)

  • 100–240 Volts AC
  • 50/60 Hz 0.5 A
  • 26–41 VA

Power supply (output)

5 V, 1.5 A

USB specification


Wireless specification

Bluetooth 4.2

Maximum wireless range

30 m


9 cm length, 6 cm height, 5 cm depth, leads: 60 cm long

How the Sensor Works

The Go Direct Constant Current System is a DC-coupled amplifier capable of delivering up to 0.6 A at 5 V DC. A current-sensing resistor allows monitoring of the output current by the data-collection software.

Current Conventions

The current will be indicated as positive if current flows from the positive (red) terminal to the negative (black) terminal as described by conventional current flow notation. Using electron flow notation, electrons flow out of the negative terminal through the circuit back to the positive terminal. The negative terminal is connected to ground via a power transistor and 0.1 Ω sensing resistor. The positive terminal connects to a 5 V power supply. The Constant Current System dial can be tuned to deliver up to 0.6 A with the voltage adjusting automatically (max 5 V). If the electrolyte resistance is too high, the 0.6 A may not be attained before the maximum of 5 V is reached.


For troubleshooting and FAQs, see

Repair Information

If you have followed the troubleshooting steps and are still having trouble with your Go Direct Constant Current System, contact Vernier Technical Support at or call 888-837-6437. Support specialists will work with you to determine if the unit needs to be sent in for repair. At that time, a Return Merchandise Authorization (RMA) number will be issued and instructions will be communicated on how to return the unit for repair.


Item Order Code
LabQuest Power Supply


Micro USB Cable


USB-C to Micro USB Cable



Vernier warrants this product to be free from defects in materials and workmanship for a period of five years from the date of shipment to the customer. This warranty does not cover damage to the product caused by abuse or improper use. This warranty covers educational institutions only.


When disposing of this electronic product, do not treat it as household waste. Its disposal is subject to regulations that vary by country and region. This item should be given to an applicable collection point for the recycling of electrical and electronic equipment. By ensuring that this product is disposed of correctly, you help prevent potential negative consequences on human health or on the environment. The recycling of materials will help to conserve natural resources. For more detailed information about recycling this product, contact your local city office or your disposal service.

Battery recycling information is available at

Do not puncture or expose the battery to excessive heat or flame.

The symbol, shown here, indicates that this product must not be disposed of in a standard waste container.

Contact Support

Fill out our online support form or call us toll-free at 1-888-837-6437.

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