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Sensors : Analog : 3 Axis 3g

G-Force Sensor

3-Axis Analog G-Force

The G-Force sensor represents an excellent match to the demands of modern motorsport with its easy integration into any logging system and compact yet rugged design.

The sensor has a proven track record with sensors giving many seasons of reliable operation.

• Cost-effective solution - AU$319.00
• 3-axis g-force measurements
• Compact at 52 x 32 x 15 mm and less than 55 grams
• Flexible connector options
• Various bandwidth options - from 1 Hz to 500 Hz
• CNC Machined Anodised Aluminium Housing
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This sensor was designed specifically for the motor racing industry. It meets the demands of the harsh environment experienced in modern motorsport. One particular application of the sensor (in the Australian V8 Supercar seires) has seen these sensors do four seasons of service - their prior sensors only managed about nine months of service before failing due to vibration.

The sensor is a three-axis (X, Y, Z) sensor with each axis orthogonal to the others, measuring positive and negative g forces in each of the 3 axes.

The development of this sensor had the following design goals:

  1. Triple axis g-force sensing
  2. Analog outputs - for easy integration into a variety of data acquisition systems
  3. Rugged design
  4. Cost competitive


The g force sensor was developed in 2007. It started life as a spin-off of a larger project, but has since found a larger market than the original project!


ParameterMinimum TypicalMaximumUnits
Measurement Range
Zero g Voltage
Sensor Output Voltage
% per degree C
Temperature Range
degrees C
Inter-Axis Alignment Errors
Cross-Axis Sensitivity
Supply Voltage (See note 1, 2)
V Sensor Supply
Supply Current


  1. DO NOT connect the sensor directly to the vehicle battery. The sensor is not capable of dissipating the energy caused by load dump conditions.
  2. The sensor is not specified for a 5V supply. However, many users have operated the sensor at 5V without problems - although there may be some loss of maximum +g range.

Wiring the G-Force Sensor

The sensor requires a supply voltage of 6 to 12 Volts, which must be from a protected source. DO NOT connect the sensor directly to the vehicle battery. The g-force outputs from the sensor are analog voltage levels that may be fed directly into the 5 Volt analog input of a data acquisition system. If excessive electrical noise is present, then a shielded loom may be required. The sensor is supplied with a pigtail loom.

Red - Supply Voltage (6 to 12V)

Black - 0V / Chassis

White - X-Axis Analog Output (0 to 3.3V)

Yellow - Y-Axis Analog Output (0 to 3.3V)

Purple - Z-Axis Analog Output (0 to 3.3V)

Mounting the G-Force Sensor

Rigid Mounting
M4 countersunk bolts may be used to mount the sensor when a more direct coupling is required. Excessive vibration "may" swamp the g-force measurements. However, this method of mounting has proven successful in a V8 Supercar (with the sensor mounted to the driveshaft tunnel).
Rigid mounting is recommended for the 100g sensor.
The top view of the accelerometer is as follows:

(all dimensions in mm)

Flexible Mounting
Double sided tape or Velcro may be used to mount the sensor when an amount of "shock filtering" is required.

Calibration : How is it performed?

The accelerometers have an output voltage which is linear across the operational range of the sensor. Each axis of the sensor may be considered independent of the other axes in the same sensor.

X and Y axes
1.Place the sensor on a flat surface with the label facing upwards.
2.Set the X and Y axes to each read 0g.
3.Place the sensor on a flat surface with the output wire facing upwards.
4.Set the X axis to read -1g.
5.Place the sensor on a flat surface with the +y arrow in the vertical direction.
6.If the arrow is pointing down, then set the Y axis to read +1g. If the arrow is pointing up, then set the Y axis to read -1g.
The calibration of the X axis and Y axis is now complete.

Z axis
The Z axis (vertical) is a special case and may be calibrated as either an absolute or a relative g-force reading:
Absolute - Calibrate the sensor to read 1g when placed flat and -1g when placed upside down. In this calibration the vehicle will have a g-force reading of 1g straight down while the vehicle is stationary.
Relative - Calibrate the sensor to read 0g when placed flat and -2g when placed upside down. In this calibration the vehicle will have a g-force reading of 0g on all axes while stationary.
JDG3-3-x AU$319.00
G-Force Range
G-Force Bandwidth
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• Price includes postage - local and international
• Price includes GST - for Autralian customers
• Import duties and taxes are the responsibility of the purchaser
• All accelerometers come with a 12 month warranty
• Discounts apply for bulk purchases - contact us for further details.

G-Force Part Numbering System

The part number consists of 3 parts:
JDG3-3-50 This part is a 3-Axis g-force sensor. The other option would be JDG2 for a 2-Axis g-force sensor.
JDG3-3-50 The (typical) full scale response of this sensor is +/-3g's on each of its axes.
JDG3-3-50 This parameter indicates the cutoff of the first order filter. The filter is factory set and can not be changed by the user. The default filter rate is 50Hz.
Filter settings available are: 1Hz, 2Hz, 5Hz, 10Hz, 20Hz, 50Hz, 100Hz, 200Hz, 500Hz.
The sample rate should be set to at least twice the filter frequency. This is required to satisfy the Nyquist criteria - avoiding higher frequency g-force components appearing as low frequency g-force components.