22 Chapter
1
DaqPRO
1.2.7.
Internal Clock and Calendar
The internal clock is set the first time you use the
Setup
command from the DaqLab software to program
the
DaqPRO
, and is automatically updated to the PC's time and date each time you connect your
DaqPRO
to a PC.
The internal clock and calendar is kept updated independent of the 7.2V battery condition, even when
the
DaqPRO
is turned off.
1.2.8.
Clearing the Memory
If you want to start recording and the
DaqPRO
’
s internal memory is full, you will see this message at the
bottom of the display:
In – 1 Voltage 0–10V
In – 2 Empty
In – 3 Empty
In – 4 Empty
SAMPLES = 200
DISPLAY = graphic
Mem full, clear = ( > )
Press the
Forward
arrow button
to clear the memory.
In order to clear the
DaqPRO
’
s memory when it is not full, use the
Memory clear
command from the
Configuration
menu (refer to page 20), or clear the memory from the
Logger
menu in the
DaqLab
software
(refer to page 53).
1.2.9.
Choosing the Right Setup
1. Sampling Rate
The sampling rate should be determined by the rate of change of the phenomenon being sampled. If the
phenomenon is periodic, sample at a rate of at least twice the expected frequency. Changes in
temperature can be measured at slower rates such as once per second or even slower, depending on
the speed of the expected changes. It is usually good practice to sample at a rate 10 times higher than
the expected frequency but for extremely smooth graphs, the sampling rate should be about 20 times
the expected frequency.
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