Dwyer DL8 - Manual (Page 3)

When viewing in realtime, the new units will be displayed at
the next update interval. The standard unit of measure will
be designated with a 1 in the Scale column. When select-
ing a different unit of measure, make sure the conversion
from the standard is correct.
Choosing a Sample Rate
The sample rate is the frequency that the logger takes read-
ings. The current sample rate is always displayed. to
change the sample rate: 1. Click the current rate. The sam-
ple rate dialog box appears. The dialog box displays current
sample rate, the number of active channels, and the length
of time it will take to fill the memory using the number of
active channels and rate. (To determine the loggers capac-
ity, enable the number of channels required before choosing
a sample rate). 2. Click the down arrow to see available
sample rates from 8 seconds to 8 hours in Continuous and
Stop When Full modes. Scroll if necessary, and click on the
desired rate. In Fast Read mode, sample rates less than 8
seconds are available. 3. Click Accept. The new sample
rate will apply to all active channels. If you do not want to
change the sample rate, click cancel.
Delaying Starting Time
Make sure the correct time is displayed in the logger win-
dow before using this function. Once the logger has been
setup, click Save Setup, and the logger will start gathering
data. To delay the start time: 1. Double click in the Start
Delay box to open the Select a Time dialog box. 2. Set the
time and/or date for the logger to start taking readings. 3.
Click Accept. The logger can be set for a delayed start time
of up to two years.
Number of Readings
The maximum number of readings the DL8 logger can store
is 32,768. If fewer readings are desired, change the number
(in increments of 500).
To calculate the number of readings a particular time span
will need, divide the time span by the sample rate (making
sure both are in seconds or minutes). If you are taking read-
ings at 8-second intervals for 24-hours, and need to know
the number of readings, convert 24-hours to seconds
(86400) and divide by the sample rate of 8-seconds to get
10,800 readings. When backing up the logger, it will stop at
the specified number of readings.
Saving Changes
When you have finished setting up your logger, click Save
Setup. A dialog box will appear asking to clear the logger
and save setup. (Setting up a logger erases all the previ-
ously gathered data). Click OK.
Fast Read Mode
Choose Fast Read Mode when:
1. You need a sample rate of less than 8-seconds, and /or
2. You want to delay the logger’s start time but do not want
to specify the start time until after the logger has been
setup.
Fast Read Mode allows you to choose sample rates from
0.04 seconds (25 readings per second) to 2 minutes. The
sample rate must be in increments of 0.04 seconds. NOTE:
A separate power source is required when using Fast Read
Mode. Power can be supplied from the computer the log-
ger is connected to or a separate battery pack (BP-100). If
using the battery pack, the logger will start taking reading as
soon as the battery is connected.
The logger cannot work in continuous Mode when using
Fast Read Mode. The logger will stop taking readings as
soon as the memory is full. The logger will also interrupt
readings when it is connected to Trendreader software.
To delay start in Fast Read Mode:
1. Set the delay time in seconds in the Start Delay box. Use
this method when the logger will remain connected to a
computer or battery pack.
2. If the battery pack will be connected at a later time, fol-
low this procedure before disconnecting the logger from the
computer: Before clicking Save Setup, set that Delay for
long enough that you can save the setup and disconnect
the logger while it is asleep. The logger must be asleep (on
start delay) when it is disconnected to be able to start tak-
ing readings when the battery is connected to it. NOTE: You
must set a minimum start delay of 16 seconds before you
disconnect the logger from the computer. the logger must
be disconnected from the computer within 8-seconds of
setting the delay. If these steps are omitted, the logger will
not start when the battery is connected.
Do not contact a logger in Fast Read Mode until you are
going to back it up. Contacting the logger will stop it from
taking readings. You can contact a logger by clicking
Contact or by opening the window once it has been closed.
BACKING UP A LOGGER
Copying data from a logger to your computer requires an
IC-100 or IC-200 Interface cable. to backup a single logger
use the IC-100 Interface Module. The IC-200 Interface
Module can be used to backup several loggers. Backing up
a logger can take a number of minutes depending on the
speed of your computer and the amount of data being
transferred.
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