Programmed Operation; How Smartreader Plus Loggers Take Readings - ACR Electronics SmartReader Plus Reference Manual

long-life lithium battery that will provide years of reliable operation, your SmartReader Plus can
work independently from any external power supply or computer. When you are ready to look
at the data it has collected, it can transfer all information to your computer through the use of
TrendReader software.
Main Components
The main components of the SmartReader Plus data loggers include:
· a memory chip that has the capacity to store up to 1 million readings (see
Specifications)
· a microcontroller and 12-bit analog-to-digital converter (A/D) that converts all input
signals to digital values
· a quartz clock crystal that accurately keeps track of time and regulates the taking of
readings
· an accurate on-board thermistor (except the SmartReader Plus 9) that the logger uses
to measure ambient temperature via changes in resistance
· a lithium battery that provides power to the logger and internal or external sensors
1.1.3

Programmed Operation

SmartReader Plus data loggers run according to settings that you program. These
pre-selected settings are stored in the logger's memory and instruct it to:
· take readings at regularly spaced intervals either at slow or fast sample rates
· take readings from specific channels that you enable
· associate each channel with an equation in TrendReader software
· start readings with or without a delay
· take readings continuously, or stop when memory is full
1.1.4

How SmartReader Plus Loggers Take Readings

Each SmartReader Plus data logger (except the SmartReader Plus 9) has an on-board
thermistor that you can use to record ambient temperature. Depending on which SmartReader
Plus model you have, you can turn this temperature-monitoring capability on or off using
software. You can also record other information by connecting sensors, transducers or
external circuitry to the plug-in terminal block.
SmartReader Plus data loggers can record readings in two selectable modes:
1. First-in, First-out (FIFO)*. In this mode the logger continues to take readings when its
memory is full (to make room, it discards the oldest reading every time it adds a new
one). Thus, the memory will contain a "sliding window" of information.
2. Stop when Full. The logger stops recording when its memory is full.
* Not available in "Fast Mode."
You can set the time interval at which your logger saves readings using TrendReader
software. The sample rate you select will apply to all enabled channels. At a sample rate of
eight seconds, one reading is taken every eight seconds and saved to memory. As you slow
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SmartReader Plus Data Logger
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