Operation - Extech Instruments 407119A User Manual

Operation

Initialization and Zero procedures (please follow these steps before use)
Important Note: The meter's probe locking switch must be in the
locked position (with the probe inserted) for the meter to turn on
and operate correctly. Refer to the accompanying diagram or the
diagram at the top of the meter for switch orientation.
For the best accuracy and for proper operation, the following
steps must be performed.
1. Connect the sensor to the input jack on top of the meter by
first unlocking the sensor jack and then inserting the sensor
plug. Lock the sensor jack after the probe is inserted.
2. Press the POWER button to turn on the meter. The meter will
perform a self-test during which the display will count down
from 9999 to 0000.
3. Select the air velocity function using the FUNCTION button. The LCD will display the most
recently selected unit of measure for air velocity.
4. To change the temperature units of measure (C/F), use the advanced programming mode
discussed later in this manual.
5. Momentary presses of the UNIT button changes the air velocity units. The LCD will reflect the
selection.
6. Place the sensor cover in the up (ZERO) position (see diagram below).
7. Open the telescoping sensing antenna to a convenient length.
8. Place the sensor in the area to be measured and allow a short time for it to stabilize to the
ambient temperature.
9. To Zero the meter display, press and hold the ZERO button until the second beep.
Warning! Do not touch the air velocity or temperature thermistors inside the sensor head while
moving the sensor cover.
5
TOP VIEW OF METER
LOCKED Position
UNLOCKED Position
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