Major tech MT948 Instruction Manual - Page 4

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Operation

Connecting the Vane

1. The vane plug is inserted in the meter's sensor jack at the top of the meter. The plug

and jack are keyed so that the plug can only ﬁt in the jack one way.

2. Turn the plug carefully until it lines up with the jack and then ﬁrmly push the plug in

place. Do not apply undue force or try to twist the plug side-to-side.

3. If the vane is not connected to the meter or if the sensor is defective, the LCD display

will indicate OL in place of a Temperature reading.

Air Velocity Measurements (Single Point)

1. Turn on the meter using the ON/OFF

2. Press UNITS button to select the desired unit of

measure. NOTE: At power up the meter will

display the last unit of measure previously

entered.

3. Place the sensor in the air stream. Ensure that

the air enters the vane as indicated by the arrow

sticker placed inside the vane.

4. View the readings on the LCD Display. The

large main LCD display shows the Air Velocity

reading. The upper right LCD sub-display shows

the temperature reading.

Air Velocity Averaging Mode

1. To enter 20 Point Averaging Mode, press and hold the AVG button until it beeps twice.

The AVG icon will be displayed.

2. Take a measurement and press the AVG button. A single beep will sound and the

HOLD icon will appear in the display.

3. The average reading will be displayed and number of readings measured will appear in

the upper right hand corner of the display. After 5 seconds, the display will return to the

current reading.

4. Repeat steps 2 - 3 until the desired number of points have been measured.

5. To return to standard velocity measuring mode press and hold AVG button until meter

beeps twice.

Note: In the standard velocity measuring mode, press the AVG button once to recall the

previous average. The average will be cleared when you enter the Averaging Mode

again.

Side view of Vane

button.

Arrow

airflow