Vaisala vLog 4.5 - Manual (Page 118)

Glossary
112 © 2011 Vaisala Canada Inc
Relative humidity
Relative humidity is the measure of the amount of water
vapor in the air compared to how much it can possibly hold at
that temperature. A relative humidity of 50% means that the
air contains only one-half as much water as it could possibly
hold. The capacity of air to hold water is heavily dependent
on the temperature of the air. The colder the air, the less
water it can hold. Air at 50°F can hold only one-quarter the
amount of water as air at 95°F
Sample
A measurement reading that is stored to data logger’s
memory
Sample smoothing (deadband)
A setting in vLog ( Tools | Options | Insert tab - Sample
smoothing) that controls how the samples in a logger file are
interpreted when they are inserted into a graph. Sample
smoothing (or sample deadband) is the minimum change in
the input signal required to cause a change in the displayed
channel values. Sample smoothing is used to dampen the
effects of noise, and is defined in terms of raw analog-to-
digital converter counts.
Sample interval
The sample interval is the rate at which the logger takes and
records readings to memory. The sample interval applies to
all enabled channels on the logger. You may want to
occasionally change the sample interval on the logger
because:
• Faster sample rates may be required by the application
• You need to record readings over a longer duration
• You want to minimize the collection of unnecessary data
Scale
The range of values a graph displays