Sierra Instruments, Inc.

- Version V14 Premium - Control, Automation and Datalogging for Automotive Testing Software


CADET enables operational personnel to easily compile test programs, automatically protect the test facility against out of limit operation, record data during testing and analyze the data during or at the completion of a test. Custom functions can be developed by the test engineer (using Visual Basic) to run during the test, these can provide additional calculated data that is stored together with real data from the test bed. The current specification has evolved to the latest generation with input from our own engineers and by working closely with our many end users. Sierra designs and manufactures all hardware and writes all software in house, so we maintain full control of the supply and development chain.

Data processing is performed on our CADET hardware rather than by the system computer. All the control and datalogging cards are driven by a common interrupt signal that allows time aligned averaged data to be captured, rather than sequential snapshot data. Additionally, all channels are optically isolated. This enables CADET to offer a high resolution and reduce the chance of monitoring noise levels.

Sierra's policy is one of continual development for both hardware and software. As any changes are designed with existing systems in mind, older systems have the option to be upgraded to the latest technology, either by exchanging cards and/or minimal system modification. All service contract holders are entitled to the latest release of the CADET software for free, which generally has two releases a year.

  • High-performance automotive software system
  • High-speed data collection, high resolution
  • Very flexible; we customize for every customer
  • Dedicated I/O control and monitoring systems
  • All software upgrades backward compatible

CADET is built to the channel count required by the customer. All hardware and software can be upgraded at any time to accommodate additional channels and interfaces. Sierra provides backwards compatibility hardware upgrades and continued software upgrade path.

An extensive stock of cards is also kept to support existing customers with older systems. All service contract holders are issued with the latest CADET software updates free of charge, meaning that new features and enhancements are continually introduced in line with the ever changing demands of the automotive test industry.

The maximum capability of the current build of CADET (V14.4) is detailed in the table below:

Description: Maximum Channel Count, V14.4

  • Physical Input: 1028*
  • Physical Output: 128*
  • Digital Input: 256*
  • Digital Output: 256*
  • Primary Setpoints: 2
  • Secondary Setpoints: 60
  • PIDs: 64
  • Logical Channels: 2048
  • User Variables: 2000
  • Independently controlled dynamometers: 10*
  • Control Functions: 32
  • Pseudo Variable Calculations: 64
  • Hardware Protection Channels: 24
  • ASAP-3 Monitored Channels: 200*
  • ASAP-3 Set Points: 50*
  • CAN Ports: 8*
  • CAN Variables – Per Port: 300

*Channel counts depend on the CADET hardware installed. CADET systems are built to the channel count required by the customer.

Hardware is custom designed from standard modules to meet the customer’s control and datalogging requirements. A questionnaire is available to aid with the specification of the CADET channels. Similarly, the CADET software interfaces to 3rd party devices required should be specified on order placement. Please contact Sierra for further details. Similarly if special software functions or tests are required then they can be programmed on request.

The major features of CADET V14.4 and the available software interfaces are detailed below:

Our Transient Test Scheduler extends our flagship CADET V14Test Automation Software by adding a productivity tool speeding up the process of writing and running transient test cycles. Writing a transient test cycle where setpoints are varying almost continuously results in a test that has many (possibly several thousand) stages. Our Transient Test Scheduler provides the test engineer with a method of writing an automatic test as an Excel file instead of using the normal test stage editor which requires a new stage to be created each time a setpoint change is required.

Once a transient schedule Excel file has been created, it is processed by the ‘Transient Schedule Encoder’ program to produce the schedule in a binary file format for the CADET V14 control system to read. A test is then automatically configured to read-in and run the encoded version of the transient schedule during one of the normal test stages.

Benefits / Features

  • Setpoints and outputs can be updated at the system control frequency
  • Reduces the amount of time required to write tests
  • Standard Excel formulas can be used to generate setpoints
  • Tests can be created away from the test rig
  • Data from external sources such as test tracks can be imported into tests
  • Error checking avoids impossible tests being scheduled

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