Operation
11
measured simultaneously. The display shows only the data for the current
measurement mode. The measurement mode may be changed at any time to
view statistics for the other measurements.
PRINT Key
Use the
key to print information on the optional Model 8925
Portable Printer. The information printed will be different depending on
what the Q-T
RAK
is currently doing.
When the Q-T
RAK
is displaying real-time readings, pressing the
key
will cause all parameters being measured to be printed along with the time
and date. Each time the
key is pressed, one set of values prints. The
values printed reflect the current time-constant; therefore, they are the same
as would be displayed.
When the Q-T
RAK
is displaying any statistic, pressing the
key will
cause the current statistics to print. All statistics are printed as a set
regardless of which one is currently displayed.
When the Q-T
RAK
is in one of the LOG modes and is idle
(“%MEMORY”
is
displayed), pressing the
key will cause the logging setup for the
current LOG mode to print.
If you press and hold the
key during the power-up sequence, and
you have the optional Model 8925 printer connected, a printout showing
certain system information occurs.
SAMPLING MODE Key
The
SAMPLING MODE
key allows you to select between the four
sampling modes: Survey, LOG 1, LOG 2, and LOG 3. Each time you press
the
SAMPLING MODE
key, the Q-T
RAK
will sequence to the next mode.
When the Q-T
RAK
is in Survey mode, the current measurement is shown on
the display. When one of the LOG modes is selected, the LOG mode
number, i.e., “
LOG 1,
” “
LOG 2,
” or “
LOG 3
” is displayed along with the
percentage of free memory available.
Survey Mode:
When the Q-T
RAK
is first turned on, it will always be in Survey mode.
Survey mode allows you to make simultaneous measurements of CO
2
concentration, temperature, and relative humidity, and to obtain
statistics for each measurement when a sample is taken. The statistics
include the average, minimum, and maximum values, as well as the
elapsed time for that sample. Individual data points are not recorded
(this can be done in any of the LOG modes). Each new sample taken in
Survey mode clears the previous sample data from memory. Data taken
in Survey mode remains in memory until another sample is made, or
