Extech Instruments LT250W, Руководство пользователя

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Operation
5
5.1 Powering the Meter
The meter operates on three (3) 1.5 V (AAA) batteries, installed in the rear
compartment.
Long press the power button to switch the meter on. Short press the power
button to switch the meter off. If the meter does not switch on, check the bat-
teries for proper orientation.
When the low battery symbol appears on the display, replace the batteries
immediately to ensure accurate readings.
5.2 Auto Power Off (APO)
The meter switches off automatically five (5) minutes after the last button
press.
The default mode for APO is ON (the APO symbol indicates that APO is
enabled).
To switch the APO function off, with the meter switched on, long press the
power
and data hold ( H ) buttons. The APO symbol will switch off, indicating
that the function is disabled. APO is reset each time the meter’s power is
cycled.
Repeat this process to switch APO back on manually.
5.3 Taking Measurements
1. Long press the power button to switch the meter on.
2. Hold the meter in hand, set it face-up on a table or desk, or mount it on a
tripod in the area under test.
3. For best results, allow the light to fully encompass the sensor dome. Also,
reduce the ‘angle of incidence’ as much as possible (angle at which the
light strikes the dome).
4. Read the illuminance reading on the LCD. If the x10 or x100 display ap-
pears, multiply the displayed reading by 10 or 100 to obtain the actual
measurement.
5. If the measurement is out of range, OL will appear on the display in place
of a typical reading.
#NAS100076; r. AA/78957/78963; en-US 6