McLaren Applied Technologies

Accelerometer Interface Unit AIU-6

Available with two, three or six channels, the AIU (Accelerometer Interface Unit) is to be used with IEPE (Integrated Electronics Piezo-Electric) accelerometers and harness to provide a high-frequency/high-G signal for the High Speed Logger (HSL-500) or alternative unit.

The AIU provides a constant current source to power the IEPE accelerometer. The voltage output from the IEPE is attenuated and buffered by the AIU to convert the 10V full scale measurement range to an output in the range of 0.5 to 4.5V, biased at 2.5V.

In Detail

AIU - Application

High-frequency chassis and engine vibration analysis.

AIU - Electrical

  • Supply Voltage 8 to 16V
  • Reverse polarity protection
  • Excitation voltage 24±0.2V
  • Excitation current 2.45±0.1mA per channel
  • Output voltage per channel
0.5 ±0.025V Full scale negative
2.5 ±0.025V 0g
4.5 ±0.025V Full scale positive
  • The above tolerance does not include the sensitivity tolerance and sensitivity drift of the IEPE accelerometer
  • Gain fixed at 0.4
  • AC coupled
  • Filter characteristics:
    • High pass Filter: -3dB at 10Hz
    • Low pass Filter: -3dB at 4.8kHz
    • Output impedance 100Ω

AIU - Environmental

  • HE30 aluminium alloy body, anodised and dyed blue
  • Splash resistant to standard motorsport fluids
  • Maximum humidity 100%
  • Operating temperature 0 to +125°C

Six-Channel AIU - Electrical

  • Supply current 60mA @ 12V typ

Six-Channel AIU - Mechanical

  • Weight less than 45g

Six-Channel AIU - Cable and Connection Definition

  • Output connector: Lemo HES.1F.308.XLDP
Pin 1 Supply
Pin 2 Ground
Pin 3 Output Channel 1
Pin 4 Output Channel 2
Pin 5 Output Channel 3
Pin 6 Output Channel 4
Pin 7 Output Channel 5
Pin 8 Output Channel 6
  • Input Connector: Lemo HEN.1F.308.XLNP
Pin 1 Excitation Ground
Pin 2 Excitation Ground
Pin 3 IEPE Channel 1
Pin 4 IEPE Channel 2
Pin 5 IEPE Channel 3
Pin 6 IEPE Channel 4
Pin 7 IEPE Channel 5
Pin 8 IEPE Channel 6

Three-Channel AIU - Electrical

  • Supply current 37mA @ 12V typ

Three-Channel AIU - Mechanical

  • Weight less than 35g

Three-Channel AIU - Cable and Connection Definition

  • Output connector: Lemo HES.0F.305.XLDP
Pin 1 Supply
Pin 2 Ground
Pin 3 Output Channel 1
Pin 4 Output Channel 2
Pin 5 Output Channel 3
  • Input Connector: Lemo HES.0F.305.XLNP
Pin 1 Excitation Ground
Pin 2 Excitation Ground
Pin 3 IEPE Channel 1
Pin 4 IEPE Channel 2
Pin 5 IEPE Channel 3

Two-Channel AIU - Electrical

  • Supply current 29mA @ 12V typ

Two-Channel AIU - Mechanical

  • Weight less than 30g

Two-Channel AIU - Cable and Connection Definition

  • Output connector: Lemo HES.FF.304.XLDP
Pin 1 Supply
Pin 2 Ground
Pin 3 Output Channel 1
Pin 4 Output Channel 2
  • Input Connector: Lemo HEN.FF.304.XLNP
Pin 1 Excitation Ground
Pin 2 Excitation Ground
Pin 3 IEPE Channel 1
Pin 4 IEPE Channel 2

IEPE Three-Axis - Electrical

  • Excitation voltage 18 to 30 VDC
  • Constant current excitation 2 to 20mA
  • Output impedance ≤200ohm
  • Output Bias voltage 7 to 11 VDC
  • Settling time (within 10% of bias) <3sec

IEPE Three-Axis - Performance

  • Sensitivity: 5mV/g ±20%
  • Measurement range: ±1000g
  • Frequency range (±5%) Y and Z axis: 2 to 8000Hz
  • Frequency range (±5%) X axis: 2 to 5000Hz
  • Frequency range (+1dB) X axis: 5000 to 8000Hz
  • Broadband resolution 1 to 10000Hz: 0.003g rms
  • Non-linearity: ≤1%
  • Transverse sensitivity: ≤5%

IEPE Three-Axis - Environmental

  • Titanium body
  • Operating temperature -50 to +180°C
  • Overload limit (shock) ±10000g pk

IEPE Three-Axis - Mechanical

  • Weight less than 1g (without cable)

IEPE Three-Axis - Cable and Connection Definition

  • Cable length 1500mm

IEPE Three-Axis - Interface Harnesses

  • Teflon coated cable
  • Harness length 1000mm

IEPE One-Axis - Electrical

  • Excitation voltage 18 to 30 VDC
  • Constant current excitation 2 to 20mA
  • Output impedance ≤200ohm
  • Output Bias voltage 7 to 11 VDC
  • Settling time (within 10% of bias) <3sec

IEPE One-Axis - Performance

  • Sensitivity: 5mV/g ±20%
  • Measurement range: ±1000g
  • Frequency range (±5%): 2 to 10000Hz
  • Frequency range (±10%) 1.5 to 15000Hz
  • Frequency range (±3dB) 0.7 to 25000Hz
  • Broadband resolution 1 to 10000Hz: 0.003g rms
  • Non-linearity: ≤1%
  • Transverse sensitivity: ≤5%

IEPE One-Axis - Environmental

  • Aluminium body
  • Operating temperature -50 to +120°C
  • Overload limit (shock) ±10000g pk

IEPE One-Axis - Mechanical

  • Weight 0.2g typical

IEPE One-Axis - Cable and Connection Definition

  • 3-56 Coaxial Jack

IEPE One-Axis - Interface Harnesses

  • Teflon-coated cable
  • Harness length 1000mm

Images/Diagrams

6-channel AIU

6-channel AIU

3-channel AIU

3-channel AIU

IEPE Three-Axis - Sensitivity Deviation vs. Temperature

IEPE Three-Axis - Sensitivity Deviation vs. Temperature

IEPE Three-Axis

IEPE Three-Axis

IEPE One-Axis - Sensitivity Deviation vs. Temperature

IEPE One-Axis - Sensitivity Deviation vs. Temperature

IEPE One-Axis

IEPE One-Axis

Ordercodes

Description Ordercode
Six-Channel AIU O 030 345 008 000
Three-Channel AIU O 030 345 008 001
Two-Channel AIU O 030 345 008 002
±1000g three-axis accelerometer O 030 345 990 000
±1000g one-axis accelerometer O 030 345 990 005
AIU6 harness connects two, three-axis accelerometers O 030 345 990 001
AIU6 harness connects six, one-axis accelerometers O 030 345 990 002
AIU3 harness connects one, three-axis accelerometer O 030 345 990 003
AIU2 harness connects two, one-axis accelerometers O 030 345 990 004
AIU3 harness connects three, one-axis accelerometers O 030 345 990 006

Contact us about Accelerometer Interface Unit

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Available with two, three or six channels, the AIU (Accelerometer Interface Unit) is to be used with IEPE (Integrated Electronics Piezo-Electric) accelerometers and harness to provide a high-frequency/high-G signal for the High Speed Logger (HSL-500) or alternative unit.

The AIU provides a constant current source to power the IEPE accelerometer. The voltage output from the IEPE is attenuated and buffered by the AIU to convert the 10V full scale measurement range to an output in the range of 0.5 to 4.5V, biased at 2.5V.

McLaren Applied Technologies
Manufactured by: McLaren Applied Technologies
Model: Accelerometer Interface Unit
Product ID: AIU-6

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