Campbell Scientific CR6 CR6 Measurement and Control System - Page 511

Section 11. Glossary Scientific. Term. thermistor A thermistor is a resistive element whose change in resistance with temperature is wide, stable, and well characterized. It can be used as a device to measure temperature. The output of a thermistor is usually non-linear, so measurement requires linearization, usually by means of the Steinhart-Hart or another polynomial equation. Campbell Scientific thermistor models 107, 108, and 109 are linearized by Steinhart-Hart as implemented in the Therm107(), Therm108(), and Therm109() instructions. Term. time domain Time domain describes data graphed on an X-Y plot with time as the X axis. Time-series data are in the time domain. Term. throughput rate The rate at which a measurement can be taken, scaled to engineering units, and the reading stored in a data table. The CR6 has the ability to scan sensors at a rate exceeding the throughput rate. The primary factor affecting throughput rate is the amount of processing in programmed in the CRBasic program. In sequential-mode operation, all processing called for by an instruction must be completed before moving on to the next instruction. Term. TTL Transistor-transistor logic. A serial protocol using 0 Vdc and 5 Vdc as logic signal levels. Term. TLS Transport layer security. An Internet communication security protocol. Term. toggle To reverse the current power state. Term. UINT2 Data type used for efficient storage of totalized pulse counts, port status (status of 16 ports stored in one variable, for example) or integer values that store binary flags. Term. unconditioned output The fundamental output of a sensor, or the output of a sensor before scaling factors are applied. See conditioned output (p. 491). Term. UPS Uninterruptible power supply. A UPS can be constructed for most datalogger applications using ac line power, an ac/ac or ac/dc wall adapter, a charge controller, and a rechargeable battery. 511