Specifications

Appendix A. Glossary
A-7
Poisson Ratio a ratio used in strain measurements equal to transverse strain
divided by extension strain. v = -(ε
trans
/ ε
axial
).
Public a CRBASIC command for declaring and dimensioning variables.
Variables declared with PUBLIC can be monitored during datalogger
operation.
pulse an electrical signal characterized by a sudden increase in voltage follow
by a short plateau and a sudden voltage decrease.
regulator a device for conditioning an electrical power source. CSI regulators
typically condition AC or DC voltages greater than 16 V to about 14
VDC.
resistance a feature of an electronic circuit that impedes or redirects the flow
of electrons through the circuit.
resistor a device that provides a known quantity of resistance.
resolution a measure of the fineness of a measurement. See also Section A.2.1
Accuracy,
Precision, and Resolution.
ring line (Pin 3) line pulled high by an external device to "awaken" the
CR23X.
RMS root mean square or quadratic mean. A measure of the magnitude of
wave or other varying quantities.
RS-232 Recommended Standard 232. A loose standard defining how two
computing devices can communicate with each other. The
implementation of RS-232 in CSI dataloggers to PC communications is
quite rigid, but transparent to most users. Implementation of RS-232 in
CSI datalogger to RS-232 smart sensor communications is quite flexible.
sample rate the rate at which measurements are made. The measurement
sample rate is primarily of interest when considering the effect of time
skew (i.e., how close in time are a series of measurements). The
maximum sample rates are the rates at which measurements are made
when initiated by a single instruction with multiple repetitions.
scan (execution interval) is the time interval between initiating each execution
of a given Scan interval. If the Execution Interval is evenly divisible into
24 hours (86,400 seconds), the Execution Interval will be synchronized
with 24 hour time, so that the table is executed at midnight and every
execution interval thereafter. The table will be executed for the first time
at the first occurrence of the Execution Interval after compilation. If the
Execution Interval does not divide evenly into 24 hours, execution will
start on the first even second after compilation. See Section OV4.3.1 for
information on the choice of an Execution Interval.
SDI-12 Serial/Digital Data Interface at 1200 bps. Communication protocol for
transferring data between data recorders and sensors.
SDM Synchronous Device for Measurement. A peripheral device that
communicates with the CR1000 via hardwire over short distance using a
proprietary protocol.