Extech Instruments EMF450 Quick Start Manual page 4

Colour Alert Chart
Range/Colour
Low (Green)
Medium (Yellow)
High (Red)
Alarm beeper
alert
Meter Power
The meter is powered by three 1.5 V AAA batteries (rear compart-
ment). Press the power button to power the meter, press the power
button for 3 seconds to switch off. Check the battery display icon
for battery status.
Data Hold
Press HOLD to freeze the reading on the display. The HOLD icon
will appear. Press HOLD again to exit.
Electric Field Measurements
The meter measures the electric field (electrical power) in the at-
mosphere. The sensor orientation is printed on the back of the me-
ter and is represented by the arrows in the figure, below. Perform all
tests according to the indicated direction of the electric field sensor.
Hold the meter at the bottom and at arm's length.
#NAS100173; r. AC/94338/94343; en-US
Magnetic
Fields
0 to 10.00 mG
10.01 to 100 mG
101 to 2000 mG
Electrical
Fields
0 to 500 V/m
501 to 1000 V/m
> 1001 V/m
RF Strength
2
0 to 0.99 mW/m
1 to 9.99 mW/m 2
0.6 to 1.9 V/m
> 10 mW/m 2
> 2 V/m
3