Test fleets need special data loggers
At first glance, it would seem reasonable to use a notebook-based solution for in-vehicle logging. Together with a suitable network interface the notebook should be able to offer all required capabilities, since functionality can be implemented in software. However, commercially available notebooks cannot handle the required temperature range. Furthermore, the system must first be booted, which takes some time – even with fast notebooks. This implies another requirement for data loggers: short startup times. Data must be acquired quickly enough for the first message on the bus to be logged. All of the noted requirements are fulfilled by special fleet loggers such as devices of Vector's GL3000/GL4000 logger product line (Figure 1). Their extended temperature range also makes it possible to use them under extreme environmental conditions. These special fleet loggers also have a real-time clock, ensuring clear time references for the acquired data.
Figure 1: Special data loggers for in-vehicle use need a rugged, robust design