Campbell CR1000 User Manual

Section 11. Glossary
Term. swept frequency
A succession of frequencies from lowest to highest used as the method of
wire excitation with VSPECT
(p. 532) measurements.
Term. synchronous
The transmission of data between a transmitting and a receiving device
occurs as a series of zeros and ones. For the data to be "read" correctly, the
receiving device must begin reading at the proper point in the series. In
synchronous communication, this coordination is accomplished by
synchronizing the transmitting and receiving devices to a common clock
signal (see Asynchronous
(p. 247) ).
Term. system time
When time functions are run outside the Scan() / NextScan construct, the
time registered by the instruction will be based on the system clock, which
has a 10 ms resolution. See scan time
(p. 527).
Term. task
Two definitions:
o Grouping of CRBasic program instructions automatically by the CR1000
compiler. Tasks include measurement, SDM or digital, and processing.
Tasks are prioritized when the CRBasic program runs in pipeline mode.
o A user-customized function defined through LoggerNet Task Master.
Term. TCP/IP
Transmission Control Protocol / Internet Protocol.
Term. Telnet
A software utility that attempts to contact and interrogate another specific
device in a network. Telnet is resident in Windows OSs.
Term. terminal
Point at which a wire (or wires) connects to a wiring panel or connector.
Wires are usually secured in terminals by screw- or lever-and-spring actuated
gates. with small screw- or spring-loaded clamps. See connector
(p. 510).
Term. terminal emulator
A command-line shell that facilitates the issuance of low-level commands to
a datalogger or some other compatible device. A terminal emulator is
available in most datalogger support software
(p. 95) available from Campbell
Scientific.
Term. thermistor
A thermistor is a temperature measurement device with a resistive element
that changes in resistance with temperature. The change is wide, stable, and
well characterized. The output of a thermistor is usually non-linear, so
530

Campbell CR1000 Specifications

General

Power Requirements	9.6 to 16 VDC
Data Logger Operating System	CRBasic
Memory	4 MB
Analog Inputs	16 single-ended or 8 differential
Analog Input Resolution	13 bits
Analog Input Range	+/-2.5V
Digital I/O	8
Pulse Counters	2
Communication Ports	RS-232
Operating Temperature	-25°C to +50°C
Pulse Channels	4