The dataTaker 50 is constructed on two printed circuit boards, which are mounted into a modular chassis.
The Processor printed circuit board is located in the bottom of the dataTaker 50 chassis. The Processor printed circuit board comprises the
microcomputer, system logic and system timing circuitry
system software in ROM memory
system and data storage RAM memory, and interface for memory cards
analog to digital converter circuitry
The Signal I/O printed circuit board is located under the top cover of the chassis, and provides all of the interfacing to the logger on its surface. The Signal I/O printed circuit board comprises the
the RS232 COMMS serial interface
the analog input channels, and multiplexer
digital input/output channels
high speed counter channels
power supply, and battery charger for a lead acid gel cell battery
12 pin connector for a connecting a Panel Mount Display module to the logger
a regulated 5 Volt sensor power supply
ground and external reference terminals
the Wake terminal for externally waking the dataTaker 50 from low power or sleep mode
An 8 way DIP switch is also located on the Signal I/O printed circuit board, beside the memory card socket. The DIP switch provides for
setting the baud rate for the RS232 COMMS serial interface
setting an address for the logger
setting the local mains frequency
The top cover of the dataTaker 50 must be removed to access this DIP switch.
The function block diagram for the dataTaker 50 is illustrated in Figure 1, which also indicates on which of the printed circuit boards the various sub systems reside.
All signal input and output connections to the dataTaker 50 are made via removable screw terminals (Series 3) or fixed screw terminals (Series 1 and 2) that are arranged on the upper surface of the data logger. The input and output channel numbers are labelled adjacent to the screw terminals.
The RS232 COMMS serial interface is implemented as a female 9 pin D type connector, located along the upper edge of the data logger.
Screw terminals for the external power supply connection and the battery connection are also located along the upper edge of the logger.
Figure 2 illustrates the layout of all terminals and connectors for the dataTaker 50.
The dataTaker 50 has a solid state multiplexer for selecting analog input channels. The multiplexer uses CMOS 4052 quad analog gate devices.
The 4052 devices have a maximum input voltage of approximately 15 Volts, and will withstand a common mode voltage of up to ±3 Volts.
The multiplexer devices also provide input protection for the dataTaker 50 against excessive input voltages, because the 4052 devices will generally fuse to open circuit when damaged. These devices are socketed for easy replacement.
The dataTaker 50 data logger has three decade voltage input ranges of ±25.000 mV, ±250.00mV and ±2500.0 mV.
The dataTaker 50 is normally supplied in the basic format as a free standing module, and can be used in this format in work rooms, laboratories and other clean areas.
Alternatively the dataTaker 50 can be mounted into enclosures to suit the particular application, eg. heavy duty industrial enclosures, weatherproof enclosures, portable carry cases, etc.
A variety of enclosures are available from your dataTaker supplier, for industrial, weatherproof and portable applications.
Figure 1 ñ dataTaker 50 Function Block Diagram
Figure 2 ñ dataTaker 50 Screw Terminal and Connector Layout.