Dwyer GDL - Manual (Page 17)

DwyerLog User’s Guide Versin 1.2x 17/25
not running. When the real time clock is stopped, and you setup your logger to log, the DwyerLog software
automatically matches the logger clock to your computer’s clock. You can also manually set the logger’s real time
clock, using the DwyerLog software
To set the logger’s Real Time Clock, select Set Clock… from the Logger menu . Make sure that “Use Windows
Clock” is unchecked, then enter the current date and time in the appropriate fields. If the “Use Windows Clock” is
checked, the logger's real time clock will be matched to your Windows clock.
Note: You cannot set the Real Time Clock while logging is in progress.
Data Security
The Dwyer loggers and the DwyerLog software have a number of features to prevent tampering with, or falsifying
the logged data. The security features are as follows:
• Each logger comes with a factory set unique logger ID. The logger ID is always displayed in the Logger Status
window and the Data Summary window. The logger ID cannot be changed by the user. The logger ID prevents
somebody from switching loggers once the data is collected.
• Once logging has started, parameters such as sample rate, logging start time, logging sample counter, etc. cannot be
changed without first clearing the recorded data. This prevents gathering many data samples at a fast sample rate
and then lowering the sample rate to give the appearance that the data was recorded over a longer period of time.
• Each logger has an internal recording session counter. This counter counts how many times the logger was setup to
record data. This counter cannot be reset. This counter can be used to guarantee that the logger data has not been
cleared during a given period of time. To do this, make a note of the recording counter after you setup the logger to
log. This counter should now remain the same. If at a later time, the recording counter has increased, you know
that somebody stopped the recording, and initiated a new logging session.
• The logger's internal real time clock cannot be changed during the logging session.
• The calibration data is password protected. This prevents a third party from recalibrating the unit to yield a false
data.
• Calibrating the logger erases the logged data from the logger memory. This prevents somebody from adjusting the
logged data after a recording was made.
Specifications
Common logger specifications are shown below. For specific logger specification, see the logger documentation.
PC Interface USB port. USB cable is included
Sampling Interval User selectable from 1 second to 18 hours, in 1 second increments.
Data Security Unique factory set logger ID. Recording session counter. Password protected
calibration.
Operating System
Compatibility Windows 98SE, Windows ME, Windows 2000, Windows XP and above. Not
compatible with Windows NT or Windows 95 .
Minimum System
Requirements 5MB of free disk space, 800 x 600 screen resolution, 1 free USB port.
Recording Start On button press, immediate after setup, or at a user specified date and time.
Recording Mode Stop on memory full, or continuous recording with memory rollover
Real Time Status Visual indication through the status LED. Software real time status.
User Calibration Password protected calibration for each channel.
User Information Up to 30 characters
Logger Channels User selectable. Disabling channels increases the storage capacity of the other
channels.
Units US and Metric
Data Format Exportable to text or Excel files.