5
1
Operation Summary
Read this section to configure and operate the LI-250. Note
that programming instructions can also be found on the
LI-250 back panel.
1.1 Configuration vs. Measurement
Mode
The LI-250 has two modes of operation; Configuration and
Measurement mode. In configuration mode, you can enter
calibration multipliers for two different light sensors, or
enter two multipliers for the same sensor. For example,
you might enter a multiplier that applies to measurements
under water and one that applies to measurements in air for
an LI-192SA Underwater Quantum Sensor. In measure-
ment mode the LI-250 makes continuous measurements
until either the HOLD key or the CAL key is pressed.
1.2 Making Measurements
The LI-250 utilizes a 5-key keypad; note that many of the
keys have two functions. The active function depends on
whether the LI-250 is in Measurement or Configuration
mode. In measurement mode, the keys perform the
function shown in green; in configuration mode, the keys
perform the function shown in white.
