VBOX 3i 100Hz Dual Antenna Data Logger

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Slip Angle measurement has never been as accurate!

The VBOX3i Dual Antenna slip angle logger is Racelogic's latest and most powerful GPS data logging system.

By utilising two GPS + GLONASS engines configured in a 'fixed baseline RTK setup', VB3iSL combines high level accuracy and test repeatability with the ability to measure slip and pitch or slip and roll angles at 100Hz.

The system is so accurate that it can even detect the difference a side wind makes to the slip angle measurement, a feat that even the very best inertial systems cannot currently replicate.

 < Watch a demo video here!

VBOX3i Dual Antenna (VB3iSL) has all the functions of the VBOX 3i but can additionally capture true heading, slip angle, pitch angle, yaw rate, lateral velocity and longitudinal velocity at 100 samples per second.

In addition to GPS, VB3iSL tracks the Russian GLONASS range of satellites. The advantage of using both satellite constellations is that there are almost twice as many measurements available to use, leading to higher accuracy.

VB3iSL is supplied with a VBOX Manager as standard for setting up slip angle data and antenna separation.


  • Non-contact 100Hz speed and distance measurement using GPS + GLONASS
  • Simultaneous measurement of Slip Angle, Pitch/Roll Angle, Yaw rate, True Heading, Lateral Velocity and Longitudinal Velocity
  • Very low latency: 6.75ms
  • 4 x 24bit differential analogue input channels with 50v input range and synchronous capture
  • Brake/Event Trigger input at 10ns resolution.
  • 2 x CAN Bus interface for data input & output
  • RS-232 serial interface
  • Bluetooth Interface
  • Audio voice tagging
  • Microphone headset included
  • Data logged to Compact Flash memory card
  • 2 x 16bit User configurable analogue outputs
  • 2 x Digital outputs
  • User configurable logging conditions
  • Logging rate selectable to 100Hz, 50Hz, 20Hz, 10Hz, 5Hz, 1Hz
  • Wide 7V to 30V operating range
  • Low current consumption
  • USB Interface

Why do test engineers choose VBOX?

The main reason test engineers choose to use a VBOX in their testing is the high level of accuracy and repeatability of results.

VBOX3i Dual Antenna will report distance within 2-3cm, on every test, and the average comes out to within less than 1cm.

Brake distance accuracy is equally impressive. Using a brake pedal mounted trigger input, VBOX3i Dual Antenna will measure braking distance to within 1.8cm. Additionally it will measure pitch angle with an accuracy of less than 0.028 rms at 2.5m antenna separation.

VB3iSL is especially appealing to ESC test engineers due to the measurement of body angle and yaw rate at 100Hz measuring subtle changes in vehicle dynamics at high accuracy.

The system is simple and quick to install. Along with the user friendly and powerful VBOX Tools analysis software this means less set-up and post processing time.

What tests can I carry out with VBOX3i Dual Antenna?

The VBOX Tools software analysis package allows you to carry out sophisticated tests in both real time and post processing. All parameters can be viewed in a customisable graph, and the data can be scanned, analysed and manipulated using the powerful Report Generator function.

There are a number of standard test configurations which can be loaded into the software with one button click:

  • Brake testing  Using a brake pedal mounted trigger input, VB3iSL will measure braking distance to within 1.8cm.
  • Performance testing This unit is perfect for all variations of performance testing, the accuracy and quick response of the 100Hz unit gives very repeatable and accurate results.
  • Acceleration Testing instantly view speed versus time & distance tables
  • Circuit testing extract and analyse lap information
  • Dynamic Tests  Slip and pitch angles updated at 100Hz alongside speed, distance and acceleration
  • Steady State Cornering - Slip angle without any drift or correction over time
  • Trailer Angles  Measure relative angles between two fixed bodies (two systems needed)

How accurate are the results?

The accuracy of the slip angle and pitch angle depend on the separation of the antennas and the quality of the antennas which are used.

The more widely spaced the antennas are, the better the accuracy you will achieve. The accuracies quoted below are for open field conditions.

Separation Slip angle Pitch angle
0.5m 0.2 rms 0.14 rms
1.0m 0.1 rms 0.07 rms
2.0m 0.05 rms 0.035 rms
2.5m 0.04 rms 0.028 rms

Mounted Antenna Pole webFor all other accuracies and specifications, please see the VB3iSL datasheet >.

We supply magnetic mounts, ground plane antennas which have been optimised for use in this application and a simple to fit pole system.

Designed to be fitted to any vehicle, the antenna mounting pole provides the optimum 2.5m seperation between GPS antennas, enabling users to capture high accuracy Pitch, Slip and Yaw rate readings. The mount incorporates a Ground Plane on each antenna stage to allow standard GPS antennas to be used.

Real-Time Live results..

The VBOX Tools analysis software can connect via serial, USB or Bluetooth and run results in real-time. You can also connect to a laptop or tablet PC such as the VBOX Q3 display (optimised for use with VBOX Tools software) to monitor speed, braking results, lap-times, and many other parameters.


To find out more or purchase a VBOX 3iSL




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