C
HAPTER
1 A
CQUISITION
? L
OGGING
?…: Important Concepts
7
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that is, the data has not yet been logged by the
DT800.
dataTaker’s Logging Function
The second of the DT800’s two basic functions is to log
data
— that is, to record or store data (Figure 2).
Once you’ve instructed the DT800 to acquire data,
you must then issue the LOGON command (explained
later) if you want it to store the data.
The DT800
The
dataTaker DT800 is an instrument for intelligently
acquiring data from sensors connected to it, recording
(logging) the data for later reference and analysis, and
taking action (like raising alarms or altering its
operation) based on the values it measures or
calculates.
What It Can Do
More specifically, your DT800 can perform any or all
of the following tasks:
•
acquire
data (scan sensors, make instantaneous
measurements and forward them to a computer)
•
log
data (that is, store measurements in its own
internal memory and/or its removable memory
card)
•
convert
measurements according to your
requirements (voltages to ºC or ºF, for example)
• carry out calculations on the measurements
(average, standard deviation, maximum,
minimum,…)
• log the converted measurements and the results of
calculations to its internal memory and/or a
removable memory card, or transfer them to a
computer
• display all of this on a computer screen
• return data directly to a computer in
real time
(that
is, as each measurement is made) as well as, or
instead of, logging it
• raise
alarms
when data is outside specified ranges.
Alarms can trigger outside events (turn on a
warning light or siren, for example), or make the
DT800 carry out additional tasks (scan more
frequently, stop logging, or scan and log additional
sensors, for example).
You’re the Boss
Being microprocessor-based, you send instructions
(“commands” — see the Extras panel “Sending
Commands” on page 8) to the DT800 from a
computer running DT800-compatible software such as
DeLogger
(used later in this guide). These instructions
tell the DT800
• which sensors to read
• how often to read them
• what to do with the data.
Then you sit back and let the DT800 do the work.
DT800
scans
sensors
DT800
displays data
Alarms, actions
F
IGURE
1
Data acquisition
DT800 saves data to
• its internal memory
• a removable memory card
• the host computer.
DT800
displays data
Alarms, actions
F
IGURE
2
Data logging
Summary of Contents for DT800
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