CR1000s are only one part of a data acquisition system. To get good data,suitable sensors and a reliable data retrieval method are required. A failure in any part of the system can lead to “bad” data or no data.

CR1000s can measure almost any sensor with an electrical response.

CR1000s measure electrical signals and convert the measurement toengineering units, perform calculations and reduce data to statistical values.

Every measurement does not need to be stored. The CR1000 will store data inmemory awaiting transfer to the PC via external storage devices ortelecommunications.

Campbell Scientific, Inc. CR1000 Datalogger

Data Acquisition System

Campbell Scientific, Inc. CR1000 Datalogger

The main objective of a data acquisition system is to provide data files on a PC.

Data are copied, not moved, from the CR1000 to the PC. Multiple users may have access to the same CR1000 without compromising data or coordinating data collection activities.

RS-232 and CS I/O ports are integrated with the CR1000 wiring panel to facilitate data collection.

CR1000 MountingThe CR1000 module integrates electronics with a sealed stainless steelclamshell, making it economical, small, and very rugged.

2.1.3 Wiring PanelThe CR1000 module connects to the wiring panel, which provides terminalsfor connecting sensors, power and communications devices. The wiring panelalso incorporates surge protection against phenomena such as lightning. SeeFIGURE 2.1-1.

2.1.4 Battery BackupA lithium battery backs up the CR1000 clock, program, and memory if it losespower.

2.1.5 Power SupplyThe CR1000 can be powered by a nominal 12 volt DC source through thegreen “POWER IN” connector. Acceptable power range is 9.6 to 16 VDC.

Campbell Scientific, Inc. CR1000 Datalogger

Analog SensorsAnalog sensors output continuous voltages that vary with the phenomena measured.

Analog sensors connect to analog terminals. Analog terminals are configured as single-ended (measured with respect to ground) or differential (high input measured with respect to the low input of a channel pair (FIGURE 2.1-3)).

Analog channels are configured individually as 8 differential or 16 single ended Channels (FIGURE 2.1-2).

FIGURE 2.1-2. Single-ended and Differential Input Channels

Analog input labels on CR1000

Pulse Sensors

Digital I/O Ports

The CR1000 has 8 Digital I/O ports selectable, under program control, asbinary inputs or control outputs.

These ports have multiple function capability including: edge timing, device driven interrupts, switch closure pulse counting, high frequency pulse counting, asynchronous communications, SDI-12 communications, SDM communications, and as shown in FIGURE 2.1-7, turning on/off devices and monitoring whether the device is operating or not.

RS-232 Sensors

RS-232 sensors can be connected to either the 9-pin RS-232 port or digital I/O port pairs.. FIGURE 2.1-8 illustrates use of RS-232 or digital I/O ports.

2.2 Hands-on Exercise – Measuring a Thermocouple

This tutorial is a stepwise procedure for configuring a CR1000 to make asimple thermocouple measurement and send the resulting data to a PC.Discussions include programming, real-time data monitoring, collecting data, and viewing data. Principles discussed are applicable to all CR1000applications.

For Thursday: