Operating Instructions - Extech Instruments 451104 User Manual

Operating Instructions

Power
Press the ON/OFF key to turn the meter on. The LCD will illuminate all display
indicators for approximately 2 seconds as it initializes. The meter will display "Vel" in
the upper left hand corner of the LCD when it is ready for use.
Selecting Measurement Ranges
To select a measurement range, press the UNITS key. The meter defaults to the
ft/min mode. Press the UNITS key until the desired range appears on the LCD [mi/h
(mph), knots (km/hr)].
Measurement modes
Standard Measurement Mode
This is the default mode in which the meter powers up. Measurements will appear
for air velocity and temperature on the LCD as they are measured. Other measuring
modes are discussed next.
Continuous Running Average Measurement Mode
This Anemometer has the ability to record data for up to 2 hours while displaying the
"running" average. Power the unit, place the vane sensor in front of the air source to
be measured, press the RECORD key, and the meter will begin displaying the
running average. Data is recorded once per second, and the user has up to 2 hours
before the meter memory is full.
MIN/MAX/AVG Measurement Mode
To measure the minimum, maximum, and average readings in a given period of time
perform the following steps:
1. Power the unit
2. Place the sensor in front of the air source
3. Press the RECORD key. The meter begins to record readings
4. Press the HOLD button BEFORE moving the sensor away from air source
5. Press the RECORD key once to display the reading that was on the LCD at
the time the HOLD button was pressed
6. Press RECORD again to display MIN reading
7. Press RECORD a third time to display the MAX reading.
8. Press RECORD a fourth time to display the AVG reading
9. To clear all four of these stored readings, remove power from the meter or
press and Hold RECORD until the meter beeps twice.
4 451104 4/03 Ver. 1.4