7
Chapter 3
Operation
Keypad Functions
When pressing the keys on the front panel, the V
ELOCI
C
ALC
Plus will beep
to confirm the function. If you press a key and the V
ELOCI
C
ALC
Plus does
not beep, then the V
ELOCI
C
ALC
Plus does not allow that function during the
selected mode.
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 (a more detailed explanation is found in the
Setting Data Storage
Options
section of this chapter). The maximum number of samples is 1394.
Test ID
: A group of samples. A test ID can contain one sample or up to
1394 samples. The statistics (average, minimum, maximum, and count) are
calculated for each test ID. The maximum number of test IDs is 275.
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”.
Logging Interval
: The logging interval is a frequency period that the
instrument will log readings. For example, if the logging interval is set to 30
minutes, readings will be taken and recorded every 30 minutes.
ON/OFF
Key
Press to turn the V
ELOCI
C
ALC
Plus on and off. During the power up
sequence the display will show the following: all characters, % battery life,
% log (memory available), baud rate, time (HH:MM), entered barometric
pressure, entered temperature, and then velocity readings.
