ACR Systems TRH-1000, Справочное руководство

Страница: 20 / 24

TRH Data Loggers
14
Copyright © 2010 ACR Systems Inc. All Rights Reserved.
1.4
APPENDIX A TRH-1000 Sample Rates
TRH-1000 Sample Rates
1.4.1 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 TRH-1000.
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 if the sampling mode is
set to Average.
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.
Otherwise if the sampling mode is set to Spot the logger still takes readings every 8 seconds
but only stores the reading taken at the selected interval.
1.4.2 Sample Rate Table
The following tables list the maximum time spans over which your TRH-1000 will record
readings. The time spans depend on the length of the sample rate. A TRH-1000 has a
memory capacity of 32,640 readings per channel.
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 TRH-1000 using a sample rate of ten minutes will store readings for 226 days
and 16 hours. 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 (FIFO), or it will stop
taking readings (Stop When Full).
Table B-1: TRH-1000 Sample Rate Table
Sample Rate Years Days Hours Minutes Seconds
8 sec. 0 3 0 32 0
16 sec. 0 6 1 4 0