407780 Datasheet, PDF (8/13 Pages) Extech Instruments Corporation. – Integrating Sound Level Datalogger

Setting the Real Time Calendar Clock
1. Start with the meter off. Press and hold the DATE TIME button, and while holding the
key, press the green ON/OFF button to switch the instrument on. Release the power
button when the meter flashes three times.
2. A blinking number indicates the currently selected parameter. The first blinking
parameter will represent the current year. Use the UP and DOWN arrow keys to set the
correct year.
3. Press the DATE TIME button to move to the next parameter (month). Use the arrow
keys to set the correct month.
4. Repeat step 3 to set the day, hour, minute, and second.
5. To confirm the new date and time press the DATE TIME button. Note that the 407780
has a back-up battery.
Note: The clock can also be set via the accompanying software program. See the
software manual on the enclosed CD for the steps on this procedure.
Powering the meter
1. Install the four (4) ‘AA’ 1.5V batteries in the rear battery compartment. Observe
polarity.
2. If the battery level falls low the battery symbol will appear on the LCD. Replace the
batteries when the symbol appears.
3. For use of the optional AC Adaptor, plug the adaptor into the side of the meter in the
jack labeled ‘6V’ and then into an appropriate AC power source.
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Model 407780 Version 2.1 09/07