Basic Operation; Operation Modes - Extech Instruments EA33 User Manual

Basic Operation

1. With the sensor cover in place, press the
will perform a short self-test.
2. Remove the sensor's protective cap and place the sensor
in the area to be measured.
3. Press the lux / fc button to select the desired units of
measure.
4. Read the light level on the display. If the measurement is
out of range, an "OL" indication will appear.
5. When the meter is turned on, the elapsed timer starts.
The elapsed timer shows days/hours or minutes/seconds. Use the TIME button to
toggle the view between minutes/seconds (M-S) and days/hours (D-H).

Operation Modes

In addition to the normal mode of operation where light level is measured, there are 5
special modes, listed below. Each mode is explained in the subsequent sections of this
manual. The SET button is used to access the modes. The number on the lower left of the
LCD (after the SET button is pressed) represents the mode currently selected. Use the
down arrow key to scroll to the desired mode.
Programming modes
Mode Name of mode
Stray+ Light
SEt 01
Time - Hold
SEt 02
rtC
SEt 03
Int
SEt 04
COMP
SEt 05
MODE 1 - Stray Light Inhibit
This feature allows the user to measure light from one source
while automatically factoring out the light from a secondary
(stray) unwanted source.
1. Turn on the desired light source and face the meter's
sensor towards this source (the stray light source should
be on also).
2. Press the SET key; 'SEt' and 'STRAY + LIGHT 'will
appear at the center of the LCD and '01' will appear on
the lower left of the LCD (see diagram).
3. Press the ENTER key (
AND the stray light sources (LIGHT + STRAY).
4. Press ENTER to store this value. STRAY will appear on the display
5. Turn off the primary light source.
6. Press the ENTER key again to store only the stray light source.
7. The meter will now compute and display the light level for only the desired (primary)
light source. 'LIGHT' and 'DH' (Data Hold) will also appear on the display.
8. Press the ENTER key to exit this mode.
button to turn the meter on. The meter
Description
Cancels out stray light from light under test
Meter measures while timer counts down.
Reading is held on LCD when counter = 0.
Set the day and time for internal clock
Lumen-seconds, lux-hour, and fc-hour
measurements
Measurements are compared to high and low
limits.
). The measurement at this point consists of the primary
4 EA33 V2.0 06/06