Extech Instruments AN500 User Manual page 6

Zero Adjustment
Press and hold the ZERO button for 1 second to zero the reading.
Backlight
Press the Zero/BL button at any time to turn on/off the backlight.
Airflow Parameters Settings
1. While in airflow measurement mode press and hold SET for 1 second to enter next step.
2. Press ▲ or ▼ to adjust R (diameter). Adjustment will be from 1.5 to 101.5 cm in CMM mode or
0.6 to 40.0 in CFM mode.
3. Press SET to enter next step.
4. Press ▲ or ▼ to adjust GAIN from 0.10-1.00. (default 1.00)
5. Press and hold the SET button for 1 second to store the settings in non-volatile memory and
return to the normal measurement mode.
Or momentarily press the SET button to return normal operation. The airflow parameters will
reset to the previous setting when the meter is powered on the next time.
6. While in Airflow parameters setting mode, the unit will return to normal operation if no button is
pressed for 8 seconds. The data will not be stored.
Battery Replacement
When the displayed battery symbol
If battery voltage is too low the meter will not switch ON. The battery compartment is located on the
rear of the instrument (behind the tilt stand) secured by one Phillips head screw.
1. Open the rear battery compartment by first swiveling out the tilt stand.
2. Remove the Phillips head screw.
3. List the compartment cover to access the batteries.
4. Replace the six 'AA' 1.5V batteries observing polarity.
5. Replace the battery compartment cover and secure with the Phillips head screw.
Battery Safety Reminders
Please dispose of batteries responsibly; always observe local, state, and federal regulations
with regard to battery disposal.
Never dispose of batteries in a fire. Batteries may explode or leak.
Never mix battery types. Always install new batteries of the same type.
EU users are legally bound by the Battery Ordinance to return used batteries to community
collection points or wherever batteries / accumulators are sold.
Disposal in household trash or refuse is prohibited.
Disposal: Follow the valid legal stipulations with respect to the disposal of the device at the
end of its lifecycle
Battery Safety Reminders
Please dispose of batteries responsibly; always observe local, state, and federal regulations
with regard to battery disposal.
Never dispose of batteries in a fire. Batteries may explode or leak.
Never mix battery types. Always install new batteries of the same type.
begins to blink, replace the batteries as soon as practical.
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