Peak Hold; Relative Mode; Reset; Backlight - Extech Instruments LT300 User Manual

Peak Hold

The Peak Hold feature allows the meter to captures light pulses that rise or fall down to
10µs.
1. Press and hold the PEAK button until CAL appears in the display.
2. Momentarily press the PEAK button. The 'P
meter will then measure and display any light pulses. The display will hold the results
until a higher pulse appears.
3. Press the PEAK button again to display the "P
4. To exit the Peak Hold mode, press and hold the PEAK button until the 'P
icon disappears.

Relative mode

Measurements can be displayed as a difference between the measured light level and a
stored reference value. To store a reading as a reference, press the REL button when the
desired reference measurement is on the LCD (the REL icon will switch on). All
subsequent displayed readings will be "relative" to the stored reference value. For
example, if the reference value is 100 and the actual light level is 125, the meter will
display 25. To view the reference value, press the REL button again so that the REL icon
begins to flash. The displayed value will be the reference value. To exit the Relative mode,
press and hold the REL button until the REL icon disappears.

RESET

Press the RESET button to clear the memory and exit from REL, HOLD, PEAK and
MAX/MIN. The RESET will also reset the auto power off timer.

Backlight

Press the " " button to turn the backlight on. Press again to turn it off.

Maintenance

Cleaning and storage
1. The white plastic sensor dome should be cleaned with a damp cloth when necessary.
Use only a mild soap if needed. Do not use solvents, abrasives, or harsh detergents to
clean the dome.
2. Store the meter in an area with moderate temperature and humidity (refer to the
operating and storage range in the 'Specifications' section).

Battery Replacement

When the battery power begins to fail the low battery symbol " "will appear on the LCD.
Replace the 9V battery by first removing protective jacket that encases the meter. Remove
the rear (center) battery compartment screw to access the battery compartment. Ensure
that the compartment cover is securely fastened and that the protective jacket is properly
installed before using the meter.
' icon will appear on the LCD. The
MAX
values.
MIN"
4
' or 'P '
MAX MIN
LT300 V2.0 6/06