ACR Electronics OWL 100, Справочное руководство, Страница: 9 / 55

OWL Data Logger
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Self-contained operation and its small size permit easy installation. The internal lithium battery
typically lasts up to 10 years or at least 1,000 backups. Unique identification names stored in
each logger allow for convenient tracking.
A 32,768 byte unlimited-write-cycle memory is used to store the measurements from an 8-bit
(equivalent to 10-bit resolution on narrow ranges) analog-to-digital converter while a quartz
crystal oscillator keeps track of time.
1.1.3 How OWL Data Loggers Take Readings
OWL Data Loggers can store 32,767 readings. Once the memory is full, the OWL can be
setup to either bump the oldest reading to make room for the newest (sliding window of 32,767
readings) or stop recording.
You can set the frequency at which your logger takes readings through the software. At a
sample rate of eight seconds, one reading is taken every eight seconds and saved to memory.
As you slow the sample rate the logger begins to average readings before saving them to
memory. To do this the logger takes a reading every eight seconds, but instead of transferring
this directly to the logger's memory, it stores the reading in a buffer (a temporary memory)
where it is retained until the sampling interval is over.
When you backup a logger's data onto your computer, the correct time and date are
referenced to each reading. All readings are then individually time and date stamped and
processed by an equation associated with the data logger channel. The result is a collection
of accurate time-based data ready for detailed graphing and analysis.
1.1.4 How to use OWL Data Loggers
Using your OWL Data Logger for most applications is a simple process. With proper planning,
setup, installation and retrieval of your data logger, you can be assured that the information
you collect will be both correct and useful. This section provides general procedures for using
OWL Data Loggers. For additional and specific information on these steps, refer to the
chapter in this manual that deals with the particular OWL model you have.
How to Communicate
In order to setup or get your logged data, you must interface the OWL with your computer
using the LIC-101 Interface Cable. The LIC-101 can be either plugged into or pointed at the
logger's optical port in order to send a setup or retrieve logged data.
Planning
Proper planning is the key to successful data logging. Time spent in this stage will help you
save time and frustration later. To help you plan, answer these questions:
·
What exactly do I want to measure?
·
Where is the best place to measure?
·
How long do I want to monitor for?
·
Should other variables be monitored simultaneously?