Appendix E Sample Rates; How A Data Logger Stores Readings; Sample Rate Tables - ACR Electronics SmartReader Plus Reference Manual

1.19

APPENDIX E Sample Rates

1.19.1

How a Data Logger Stores Readings

The sample rate of your data logger is the frequency with which it stores readings in its
memory. A selected sample will apply for all channels on a SmartReader Plus.
If you set your data logger's sample rate to eight seconds, it reads its input channels and
stores the readings once every eight seconds. If you choose a sample rate longer than eight
seconds, the logger still reads its input channels once every eight seconds, and stores an
averaged reading at the end of the sample interval you have chosen.
For example, if you use a two-minute sample rate, the data logger takes fifteen separate
readings over each two-minute interval. At the end of each two-minute interval, the logger
calculates the average of the fifteen readings, and stores that average in its memory.
1.19.2

Sample Rate Tables

The following tables list the maximum time spans over which your SmartReader Plus will
record readings. The time spans depend on the number of channels enabled and the length
of the sample rate. A SmartReader Plus-32K has a memory capacity of 21,500 readings. A
SmartReader Plus-128K can store 87,000 readings and a 1.5 MB version can store 1,048,000
readings.
In each table, the Sample Rate column lists the available sample rates. The Days, Hours,
Minutes and Seconds columns list the time spans over which your logger will record readings
at each sample rate.
For example, a SmartReader Plus-32K with two channels enabled, using a sample rate of ten
minutes, will store readings for 74 days, 15 hours and 40 minutes. After that time, depending
on how it was set up, the logger will either continue to take readings and replace the oldest
readings with the new readings, or it will stop taking readings.
Copyright © 2010 ACR Systems Inc. All Rights Reserved.
Sample Rates
Table F-1: SmartReader Plus-32K Sample Rate - One Channel Enabled
Sample Rate
0.04 sec.
0.1 sec.
0.2 sec.
0.5 sec.
1 sec.
SmartReader Plus Data Logger
Days Hours Minutes
0 0 14
0 0 35
0 1 11
0 2 59
0 5 58
Seconds
20
50
40
10
20
94