Extech Instruments 407790A, User Manual

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407790A-EN_V2.4 1/20
3.2 SD Memory Card
Measurement data can be stored on a removable SD memory card for later use.
Note: Power OFF the meter before inserting or removing the memory card.
Use only a 4GB micro SD card. Removing SD card or powering the meter off while data is storing
to the card can cause internal data to be destroyed.
1. Insert the card taking care to observe the correct orientation. Push the card in carefully,
until it is properly sealed.
2. To remove, push the card. The SD card with pop out and can be removed.
3.3 Setting the Backlight Auto Off time
1. Press the to turn the backlight on or off.
2. Press the MENU key to bring up the menu list screen.
3. Use the

+
/
 -
key to select “Backlight Auto Off” then press the

key.
4. Use the

+
/

-
key to select the automatic turn off time then press the

key. Options
are: 30 seconds, 1 minute, 3 minutes or OFF (without automatic turn - off function).
5. Press MENU key to return to the measurement screen.
To turn the backlight off before the automatic turn - off time, press the key.