Section 1.
1
Operation summary
The LI-250A Light Meter displays measurements from
LI-COR radiation sensors, including the LI-190R,
LI-191R, LI-192SA, LI-193SA, LI-200R, and LI-210R. It is
compatible with all LI-COR light sensors that have a BNC
connector. The LI-250A provides high-resolution reading
and conversion of microamp signals from the attached
light sensor into suitable light measurement units. The
LI-250A does not have a specific calibration; calibrations
are associated with the attached light sensor.
Configuration mode vs. measurement mode
The LI-250A has two modes of operation:
Configuration
Mode
, where you enter calibration multipliers for light
sensors, and
Measurement Mode
, where the LI-250A makes
measurements. Press the
Cal
key to switch between modes.
Most of the keys on the 5-button keypad have two func-
tions. The active function depends on whether the
LI-250A is in measurement mode or configuration mode.
In measurement mode, the keys perform the upper func-
tion on each button (in green); in configuration mode,
the keys perform the lower function (in white).
