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ELOG automatically detects what type of
instrument it is communicating with and adjusts the appropriate options
accordingly. This makes setting up your equipment even easier. All of the
options are fully user configurable and can be turned ON or OFF with just one
click. Examples of each page of the Setup Table follow, including asking for
connection diagrams and what a Setup Table List looks like.
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Communications capabilities can
be explored with the Tool Bar including the LoggerList which is a listing of
all loggers that are set up for Wired or Wireless communications.
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After connecting the logger to a load, it is often useful to
look at the parameters the logger is measuring to verify that the sensors have
been installed and are operating correctly. Their are two types of
Real-Time Data Display formats that you can choose; Text or Graph. Examples of
both formats follow.
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Once the data stored in the
Logger has been retrieved to a PC, there are three options available:
1)
The data may be opened for viewing.
2) You can select a range of
data.
3) From this data you can
create many different types of graphs and even export the data as a comma
separated variable file (.CSV) for viewing or further analysis in other
applications such as spreadsheets.
A very useful way to get a
quick summary of the data is to call up the Data File Summary. The Data File
Summary opens Notepad and creates a new file that provides a snapshot of the
data including; the measured parameters, the setup table and the logger itself.
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The buttons along the lower left side of the window select
the Channel to be displayed. One channel may be viewed at a time. This screen
includes a good deal of information. The voltage and current harmonics are
presented graphically in the upper part of the window. The y-axis is scaled in
percent of the fundamental. The x-axis is the harmonic. Both even and odd
harmonics are shown.
The actual value of the voltage and current for each
harmonic may be found in the Harmonic Values box. By clicking on the arrow
buttons, higher or lower order harmonics may be selected. The Waveform Values
box provides summary statistics for the overall current and voltage waveforms.
This includes the RMS value, Total Harmonic Distortion (THD), Peak values, and
Crest Factor.
Note: (image 1) The individual harmonic values and
THD can be shown as a percentage of the fundamental (IEEE Standard 1035-1989)
or as a percentage of the total RMS value (CSA and IEC standard). The number of
harmonics shown can be out to the 64th place plus the DC component.
Note: (image 2) The
image displayed shows a highly distorted (current) waveform from a computer
power supply. These waveforms are typical for switching power supplies and are
a major cause of line harmonics.
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One problem with having
multiple sites is having to download all of the files from those sites.
ELOG™ supports multiple remote data collection options: AutoPoll™ and
AutoHost™.
AUTOPOLL: Unattended PC initiates calls to the loggers
AutoPoll is a Windows™
application that comes with ELOG2001. It allows you to have your PC perform
automatic, scheduled data downloads from loggers that are connected to a modem.
After the program is setup with the Logger List and Schedule, you can go home
for the day knowing that your PC will do all the Data Collection for you. The
cost to you? Nothing! AutoPoll is included with your software purchase. An
example of the AutoPoll schedule window is below:
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AUTOHOST: Unattended Logger initiates calls to the
PC
AutoHost is the second remote
data collection package. It is very useful for loggers equipped with an
internal or external modem. It enables you to setup the loggers to
automatically call a host computer. In applications such as residential homes,
it can be very beneficial to use the homeowner's existing phone line. This
shared communication capability could save a project hundreds of thousands of
dollars (it already has for some of our customers). The loggers can be
scheduled to call an 800 (or other) number at times that the homeowners are not
awake. The loggers will even automatically hang up if the phone is needed late
at night. This feature will change the way remote data logging is done! The
cost to you? Again, Nothing! It's included with your logger
purchase.
ELITEpro and DATApro
instruments with modems can be configured to automatically initiate telephone
data retrieval sessions (AutoHost, short for Automatic PC Host), as well as
answer calls from the PC (AutoPoll). The AutoHost configuration function in
ELOG allows storing of a call-out schedule, task-list and telephone number for
the logger to call. At the time(s) specified in the configuration table stored
in the logger, the logger will call a host computer at the telephone number in
its memory.
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The configuration table makes
it easy to set-up automatic meter reading for your data loggers.
ELOG also supports preset
alarms. Alarms are set-points configurable by the user. The user can set an
alarm condition set-point (see the following example) as follows:
(e.g.. if the kW exceeds 40 kW
or the Voltage drops below 112 Volts) for example, if the measured quantity
exceeds 3.0 call the AutoHost computer and report an alarm condition. When an
alarm condition occurs, whether it is a high or low condition, the logger
records the condition into the logger's data and calls out to a computer setup
with AutoHost. The logger then downloads an alarm report (see the following
example) and performs a full data download of the data prior to the alarm
condition. This will allow the user to analyze the condition leading up to the
alarm. Invaluable information can be obtained for trouble-shooting a system
using this information. An example of an alarm report follows:
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