Vaisala vLog 4.5 - Manual (Page 120)

Glossary
114 © 2011 Vaisala Canada Inc
U–Z
USB
An acronym for Universal Serial Bus, a standard for
connecting external devices such as a mouse, keyboard,
scanner, printer. USB offers many benefits over serial and
parallel port connections, including thinner and cheaper
cables, greater expandability (with the addition of a USB hub,
a single USB port can handle over 100 peripheral devices)
and greater speed.
UTC
An acronym for Universal Time Coordinated, UTC is a
standard time common to every place in the world. Also
known as Greenwich Mean Time (GMT) and World Time;
UTC is expressed using a 24-hour clock but can be
converted into a 12-hour clock (AM and PM). An absolute
time reference that does not rely on Time Zone information,
UTC contrasts with Local time. UTC and Local Time
information is contained in Logger files and is used to form
the time base on logger graphs and data.
Validatable
Capable of being validated. Three issues are essential
before equipment can be considered validatable:
• There must be documented evidence of performance
verification available. As an example of this requirement
for documented evidence, a NIST – traceable calibration
certificate is provided with every VL-Series Data Logger
• The equipment must match the specific requirements of
the application. Each application may involve special
accuracy, operating range, performance stability or other
requirements that the product must meet
• The equipment must be capable of maintaining a validated
state throughout the application process. The product or
its output cannot be manipulated, changed or tampered
with