Construction of the dataTaker 500/600 Series
The dataTaker 500/600 series loggers are constructed on two printed circuit boards, which are mounted into a modular chassis which also houses the internal battery.
The dataTaker 600 series also have a Display/Keypad printed circuit board fitted above the battery tray.
The Processor printed circuit board is located in the bottom of the dataTaker 500/600 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 immediately above the lower chassis of the data logger, and provides all interfacing to the data logger along its edges. The Signal I/O printed circuit board comprises the
the RS232 COMMS serial interface
the RS485 NETWORK serial interface
the analog input channels and multiplexer
digital input/output channels
high speed counter channels
power supply and battery charger for the internal lead acid gel cell battery, and any external batteries.
12 pin connector for a connecting a Panel Mount Display module to dataTaker 500 series loggers
a regulated 5 Volt sensor power supply
ground and external reference terminals
the Wake terminal for externally waking the dataTaker 500/600 logger from the low power or sleep mode
a 25 pin plug for connection of Channel Expansion Modules.
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 the network address of the logger
setting the local mains frequency
The top cover of the dataTaker 500/600 must be removed to access this DIP switch.
The function block diagram for the dataTaker 500/600 series loggers is illustrated in Figure 3, and indicates on which of the printed circuit boards the various sub systems reside.
All signal input and output connections to the dataTaker 500/600 loggers are made via removable screw terminals (Series 3) or fixed screw terminals (Series 1 and 2) that are arranged along the edges of the data logger. The input and output channel numbers are labelled adjacent to the screw terminals
Screw terminals for the power supply input and RS485 NETWORK serial interface are located along the rear edge of the Signal I/O printed circuit board.
The RS232 COMMS serial interface is implemented as a female 9 pin D type connector, located along the rear edge of the Signal I/O printed circuit board.
Figure 4 illustrates the layout of all terminals and connectors for the dataTaker 500/600 series loggers.
The dataTaker 500/600 series loggers have 2 different types of analog input channel multiplexer, solid state (CMOS) multiplexer or relay multiplexer.
The major difference between these multiplexer types is the common mode voltage and the voltage ranges that the dataTakers with each multiplexer type can measure directly.
The dataTaker 500 and dataTaker 600 data loggers have 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 provide input protection for the dataTaker 500 and dataTaker 600 against excessive input voltages, because the 4052 devices will generally fuse to open circuit when damaged. These devices are socketed for easy replacement.
The dataTakers that have the solid state multiplexer have three decades of voltage input ranges of ±25.000 mV, ±250.00mV and ±2500.0 mV.
The dataTaker 505, 515, 605 and 615 data loggers all have a relay multiplexer, which uses high precision electromechanical relays.
The dataTakers which have the relay multiplexer also have internal input attenuation which provides two categories of voltage input range as follows
when the internal attenuators are not selected, there are three decades of low voltage input ranges of ±25.000 mV, ±250.00mV and ±2500.0 mV
when the internal attenuators are selected, there are three decades of high voltage input ranges of ±7.000 V, ±70.00 V and ±100.0 V
The input attenuation, and hence voltage measuring ranges, are selected under program control.
The relay multiplexer has high withstanding input voltages when open contact as follows
1.5 KVolts for 10 µS
500 Volts for 50 mS
100 Volts indefinitely
The dataTaker 500/600 series loggers are 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 500/600 series loggers 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 3 ñ dataTaker 500/600 Series Loggers Function Block Diagram
Figure 4 ñ dataTaker 500/600 Series Loggers Screw Terminal