PMS

Portable Measurement System

 

The main component of the system is a portable data logger / recorder designed for easy set-up and trouble free operation. The unit is completely sealed according to IP67 and can be used in wet and muddy conditions

Direct-connect sensors include speed, temperature, vibration, acceleration, and suspension travel. The logger's four input channels accept any combination of these sensors, plus resistive, 0-5 vdc signals, and contact closures.

 
photo of PMS1 unit
 
Stands alone: The IDbike PMS does not require a computer while it is logging. It can be connected to a computer using a serial RS232 cable for set-up, data transfer or to display readings in real time. You can also communicate with the Pocket Logger using cellular or land-line modems, or a wireless link.
Long life: Battery life with any combination of sensors is over two years (continuous operation). All sensors are powered from the logger's battery. The battery is user-replaceable (standard 9 volt size).
Connect sensors: The sensors are connected with the portable logger with watertight sealed connectors (IP67).
Easy to use: To start logging, the user selects the Logger's Set-up screen using the (available for free download). 'Point and click' choices include start and run mode, channel scaling, and sample rate (2 seconds to 12 hours - fast sampling from 1Hz to 200Hz is also available. Text fields describing the logging session can be edited. A single 'Click' sends the Set-up to the Pocket Logger.
 
graph
 
Transfer data: Data may be transferred using a serial cable, a wireless link, or using modems (cellular or land line). Data transfers do not interfere with any on-going logging session.
Graph data: A presentation-quality graph displays on your PC immediately after transferring data. Data can be easily exported to spreadsheet or statistical programs.
 

Key Benefits:

  • Four multi-purpose inputs; mix and match sensors in any combination.
  • Each input will also read resistance, 0-5 vdc or a contact closure.
  • Waterproof glass filled polyester case.(IP67)
  • Data retention of over 200 years with no power.
  • High accuracy, up to +/-0.15°C and +/-0.25% F.S. with no calibration.
  • Adjustable resolution of 12, 10 or 8 bits (lowering resolution increases reading storage capacity).
  • Long battery life, runs unattended for over 2 years (including sensors) without external power.
  • Easy to use Windows software for logger setup, data transfer, graphing and data export.
  • Year 2000 compliant.

Measurement examples:

In this example the IDbike portable measurement system is used to measure the vibration on a bicycle. The signal of a acceleration sensor is measured on one of the 4 channels .

The vibration levels on a bike is dependent of :

  • The suspension system
  • The type of tire
  • The tire pressure
  • The road quality
The graph displays the results of a vibration measurement with a bicycle with ATB tires on 3 different types of road:
  • A smooth asphalt road
  • A rough asphalt road
  • A cobble stone road
 
graph


On the horizontal axle the frequency of the vibration is displayed, from 0 to 100 Hz. The vertical axle displays the vibration level.

The differences in vibration level are clearly, especially of the frequencies between 10 and 40 Hz. These are about the frequencies for which the human body is the most sensitive.

The data acquisition system also enables the bicyclist to quantify the differences in vibration levels of different types of road surface.

 
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