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Figure 32 uDL2 Front Face
When more than one signal is being measured the LCD will cycle through each measured signal each time a sample
occurs. For example if Potential DC Volts, Potential AC Volts and Temperature were all enabled, the display would
cycle through each of these measured values. While in the real-time display mode each measurement would be displayed
for 2 seconds.
If an over-range condition is detected on the input signal, the uDL2 will display 'OVR' or '-O-' in the measurement
value area. 'OVR' is displayed when the magnitude of the measured signal multiplied by the configured scale factor
exceeds 1999. When 'OVR' is displayed for a measurement, the correct measurement value will still be stored correctly
in the measurement data as the measurement memory can hold values larger than 1999. '-O-' is displayed when the
input signal exceeds the hardware capabilities of the currently selected range. If '-O-' is displayed for a measurement,
the extracted measurement data will show 'OVER+' or 'OVER-' for the reading.
After the 1 minute elapses the real-time measurement display mode will stop and the device will automatically begin
data logging and measurement storage at the rate determined by the parameters. The LCD display value will update each
time a sample occurs. For example if a 10 second sample period was selected the display would update every 10 seconds.
When more than one signal is being measured the LCD will cycle through each measured signal each time a sample
occurs. If all three measurement signals were enabled the LCD would display DC Volts for 10 seconds, then AC Volts
for 10 seconds, then temperature for 10 seconds and then return to DC Volts. The CSV data file will contain all three
measurements every 10 seconds.
The uDL2 is equipped with an over-current disconnect. If the current flowing through the internal current path exceeds
approximately 1A, the uDL2 will open the coupon interruption relay to prevent damage to the uDL2 sense elements. If
the over-current disconnect is activated, the relay will remain open until the analog is detached and then re-inserted. An
over-current disconnect is indicated by an LCD display showing "[O]" in the reading area.
To stop data logging simply unplug the measurement cable. The device will automatically shut off.
Each time the measurement cable is inserted the device will begin the 1 minute real-time measurement display mode
and then begin data logging. Each new measurement session is appended to the previous measurements in device
memory. In GPS equipped units that have a GPS signal lock, the GPS location is recorded in the CSV file at the start of
each new measurement session.
When the memory of the device is full the uDL2 will display "FUL" on its LCD, mark the measurement memory with
a full indication and stop taking measurements. The 2,000,000 measurement memory will provide about 22.8 days of
measurements at a 1 second sample rate for a single channel.
The device has an internal rechargeable Li-Ion cell that is automatically recharged when the unit is connected to the
computer USB port. The battery can be fully recharged in about 4 hours. The battery icon flashes while the unit is being
charged and becomes steady state on once the battery is fully charged. The uDL2 has an internal charge controller so
there is no problem in leaving the device connected to a USB port for extended periods of time. The fully charged battery
will provide at least 2,000,000 measurements or four months on a charge.
The useful battery lifetime is targeted to be 5-7 years at which time it can be factory replaced. The water resistant and
compact design of the uDL2 makes field battery replacement impractical. In order to maintain the high accuracy it is
suggested the device be factory calibrated at least every 5 years.
The last calibration date can be viewed by utilizing the 'Detailed Status' function in the uDL2 configuration application.
The unit should be recalibrated as required to maintain accuracy for the measurement application. Re-calibration
intervals are suggested to be nominally every 2 years and as a maximum every 5 years. However, as customer accuracy
requirements will vary, the individual customer may determine optimal re-calibration intervals based on accuracy aging
specifications found in Appendix A.
MOBILTEX® DATA LTD.
Calgary, Alberta
www.corTalk.com
TITLE: uDL2 Configuration and Operation Guide
DOCUMENT NO.:
SHEET:
UDL2-MAN-001
REV:
25 of 28
1.07
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