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CR1000s are only one part of a data acquisition system. To get good data, - PowerPoint PPT Presentation


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Campbell Scientific, Inc. CR1000 Datalogger. Data Acquisition System. 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.

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Presentation Transcript
slide1

Campbell Scientific, Inc. CR1000 Datalogger

Data Acquisition System

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 to

engineering units, perform calculations and reduce data to statistical values.

Every measurement does not need to be stored. The CR1000 will store data in

memory awaiting transfer to the PC via external storage devices or

telecommunications.

slide2

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.

slide3

Campbell Scientific, Inc. CR1000 Datalogger

CR1000 Mounting

The CR1000 module integrates electronics with a sealed stainless steel

clamshell, making it economical, small, and very rugged.

2.1.3 Wiring Panel

The CR1000 module connects to the wiring panel, which provides terminals

for connecting sensors, power and communications devices. The wiring panel

also incorporates surge protection against phenomena such as lightning. See

FIGURE 2.1-1.

2.1.4 Battery Backup

A lithium battery backs up the CR1000 clock, program, and memory if it loses

power.

2.1.5 Power Supply

The CR1000 can be powered by a nominal 12 volt DC source through the

green “POWER IN” connector. Acceptable power range is 9.6 to 16 VDC.

slide5

Analog Sensors

Analog 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).

slide6

Analog input labels on CR1000

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

slide9

Digital I/O Ports

The CR1000 has 8 Digital I/O ports selectable, under program control, as

binary 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.

slide11

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.