5
Chapter 3
Operation
Keypad Functions
ON/OFF Key
Press to turn the Alnor RVA501/Airflow
Instruments
LCA501 on and off. During the
power up sequence the display will show the
following: Model Number, Serial Number,
Software Revision and Last Date Calibrated.
Arrow (
) Keys
Press to scroll through choices while setting a
parameter.
(Enter) Key
Press to accept a value or condition.
Arrow (
or
)
and Menu Soft
Keys
Press arrow keys to change choices while
setting a parameter. Press the
Menu
soft key
to select the Menu selections, which are
Display Setup, Settings, Flow Setup, Data
Logging and Calibration.
Common Terms
In this manual there are several terms that are used in different
places. The following is a brief explanation of the meanings of those
terms.
Sample
Consists of all of the measurement parameters stored
at the same time.
Test ID
A group of samples. The statistics (average, minimum,
maximum, and count) are calculated for each test ID.
The maximum number of test IDs is 100.
Time
Constant
The time constant is an averaging period. It is used to
dampen the display. If you are experiencing fluctuating
flows, a longer time constant will slow down those
fluctuations. The display will update every second, but the
displayed reading will be the average over the last time
constant period. For example, if the time constant is 10
seconds, the display will update every second, but the
displayed reading will be the average from the last 10
seconds. This is also referred to as a “moving average”.
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