Term. URI
uniform resource identifier
Term. URL
uniform resource locater
Term. variable
A packet of SRAM given an alphanumeric name. Variables reside in variable
memory.
Term. variable memory
That portion of SRAM reserved for storing variables. Variable memory can
be, and regularly is, overwritten with new values or strings as directed by the
CRBasic program. When variables are declared As Public, the memory can
be visually monitored.
Term. Vac
Volts alternating current. Also VAC. Two definitions:
o Mains or grid power is high-level Vac, usually 110 Vac or 220 Vac at a
fixed frequency of 50 Hz or 60 Hz. High-level Vac can be the primary
power source for Campbell Scientific power supplies. Do not connect
high-level Vac directly to the CR1000.
o The CR1000 measures varying frequencies of low-level Vac in the range
of ±20 Vac. For example, some anemometers output a low-level Vac
signal.
Term. Vdc
Volts direct current. Also VDC. Two definitions:
o The CR1000 operates with a nominal 12 Vdc. The CR1000 can supply
nominal 12 Vdc, regulated 5 Vdc, regulated 3.3 Vdc, and variable
excitation in the ±2.5 Vdc range.
o The CR1000 measures analog voltage in the ±5.0 Vdc range and pulse
voltage in the ±20 Vdc range.
Term. volt meter
See Term. multi-meter
(p. 520).
Term. volts
SI unit for electrical potential.
Term. VSPECT
trademark for Campbell Scientific's proprietary spectral-analysis, frequency-
domain, vibrating-wire measurement technique.
532
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