Extech Instruments 407790A, User Manual

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407790A-EN_V2.4 1/20
3. Measurement Preparation and Setup
1. Battery installation: Remove the rear battery cover as shown below and insert (4) 1.5V ‘C’
size alkaline batteries. Take care to observe battery polarity. Replace the battery cover.
2. Battery replacement: When the battery voltage drops below operating voltage,
battery symbol flashes on the display.
3. AC adaptor connection: Insert the adaptor in the DC 6V jack on the side panel. When the AC
adapter is connected, the meter will be powered from the adapter even if batteries are
installed.
Notes:
To prevent the risk of damage, use only the factory supplied AC adapter.
To prevent the risk of battery leakage, remove the batteries from the meter when the meter is
not in use.
3.1 Setting the Date and Time
Date and time information is stored with each record saved. Set the date and time as follows:
1. Press power switch ON and wait until the measurement screen appears.
2. Press the MENU button. The menu list screen will display.
3. Press the

+
/

-
button to select “D) Date setting (Y/M/D)” and then press the enter

button.
4. Press the

+
/

-
button to set the value. Press

button to confirm.
5. Continue pressing the above buttons to scroll through and set each option for date and time.
The meter will continue to scroll through setup for date Y/M/D and then the time settings
h/m/s.
6. When the settings are correct, press the

button to exit the setting mode. The clock will
start running with the new settings.
7. Press MENU button to return to the measurement screen.
Note: The clock has an error of about 1 minute per month. Before taking measurement, be sure
to check and set the time if required.
Date