Extech Instruments AN320 User Manual page 4

Brief Keypad Description
Press momentarily to switch the meter ON or OFF. Press and hold this button for 2
SET seconds to enter or exit the Setup mode (refer to Setup mode section for details).
HOLD o Press momentarily to freeze the displayed reading (HOLD icon switches ON); press
MAX/MIN
again momentarily to exit the HOLD mode (HOLD icon switches OFF)
o Press and hold for 2 seconds to display the MIN (minimum) reading; press and hold
again to display the MAX (maximum) reading; Press and hold a third time to exit
o This button is also used in the AVERAGE mode (for recording readings one at a time
or for a 'timed' recording session) and in the SETUP mode (for configuring the
meter). Please review the AVERAGE and SETUP mode sections for details
U/mode
AVG Press momentarily to toggle between ppm (CO
▲
Press and hold for 2 seconds to access the Multi‐Point Average and Timed Average
modes (the AVG icon switches ON). Detailed instructions for these modes are provided
later in this guide. In the Setup mode press to select a category or to increase a value
(refer to Setup mode later in this guide)
L/mode
▼
Press to toggle the lower display between air temperature, air volume, wet bulb
temperature, and dew point temperature readings; Also used in the Multi‐Point
Average, Timed Average, and Setup modes; refer to the AVERAGE and SETUP modes
sections later in this guide
U/mode
AVG
▲
+
+ +
U/mode
AVG
▲
With the meter switched OFF, press and hold these two buttons to disable
Auto Power OFF. Detailed AUTO POWER OFF (Sleep mode) instructions are
provided later in this guide
Press all 3 buttons simultaneously to enter the Calibration mode.
L/mode
▼ Calibration instructions are provided in detail later in this guide
), humidity, and air velocity readings.
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