Readings from sensor modules can be logged at sampling rates of up to 1ms with the new portable data loggers from HIOKI. Available from MDL Technologies, the LR8450-01 Memory HiLogger can host up to 11 plug-in and wireless modules to record as many as 330 channels simultaneously.A range of sensor modules is available for measuring voltage, temperature, humidity, resistance and strain. Since the loggers can accept modules having different sampling speeds, it is possible for example to monitor fast fluctuations in voltage at the same time as tracking slow temperature changes.
Each sensor module incorporates its own A/D converter, ensuring a high maximum sampling rate even when multiple modules are added. The strain modules, despite their compact size, all have a built-in bridge box which allows strain gauges to be directly connected.
With a compact A4 size that makes them convenient for on-board testing in vehicles, the loggers have a wide screen for easy viewing of waveforms. The standard LR8450 model can host up to four plug-in modules, but not wireless modules.
Both models have strong resistance to interference from high frequency noise, enabling stable data logging even in the presence of strong electrical noise sources such as inverters.
The new loggers were developed following feedback from HIOKI customers who wanted to be able to log large numbers of channels more quickly, in areas such as electric vehicle development. They wanted to measure strain on vehicle chassis and batteries as well as temperature, and to reduce wiring man-hours and measurement issues by capturing strain data wirelessly.
Strain gauges are extremely thin, and with multi-channel setups their wires are hard to install and prone to break when positioned at a distance from the host instrument. Wireless measurement using the HIOKI loggers allows wire lengths to be minimised so that wiring man-hours are reduced and wire breaks avoided.
“The LR8450 series is also ideal for capturing output data from sensors that measure low frequency data below 100Hz such as resin pressure or vibration, which are difficult to measure at conventional sampling speeds,” said MDL managing director Mark Lucock.
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