Data acquisition equipment Sample Clauses

Data acquisition equipment. 5.1.1 Data logging Typically, in an ND study participants get their own vehicles equipped with some sort of data logging device that can record various driving behaviours such as speed, braking, lane keeping/variations, acceleration, deceleration etc. This data logging system is an essential part of the ND approach. Careful consideration and utilisation of appropriate data logging equipment can be the difference between a successful and unsuccessful study. Most modern-day data acquisition systems are telemetry-based systems pow- ered by an uninterrupted, ‘mains’ type supply. They are connected to a more powerful computer (wired or wirelessly) for instant data download at rates of up to 1000Hz. There are a number of different types of approaches to choosing data acquisition sys- tems; these can be classified as follows: • Purchase of ready-made, 'off-the-shelf' systems • In-house design • Hybrid systems The advantages and disadvantages of these are as described in Table 5.1. Table 5.1 Advantages and disadvantages of three types of data acquisition systems Data acquisition system Advantages Disadvantages ‘Off-the-shelf’ Ease of use Ease of instalment Relatively cheap Difficulties adding extra channels Difficulties responding to new data-logging requirement In-house design Can be tuned to specific research needs Can use individual ‘top-of-the- range components (e.g. GPS re- ceiver) Knowledge and expertise required to develop the system Knowledge and expertise required to make the system work Hybrid system Allows flexibility of component specification System expansion relatively sim- plistic Relatively cost-effective Requires some software and pro- gramming expertise