11
3. Press the
ZERO
key. If no error messages appear, your unit is calibrated.
(For a description of ERROR MESSAGES see page 17).
Note: The 0.0 screen will remain until a sample is measured or the
power is turned off.
CALIBRA
TION PROCEDURE
Calibration should be performed daily, before measurements are made,
when the battery has been replaced, between a long series of measure‑
ments, or if environmental changes have occurred since the last calibration.
2. Using a plastic pipette, fill the sample well with distilled or deionized
water. Make sure the prism is completely covered.
Note: If the ZERO sample is subject to intense light such as sunlight
or another strong source, cover the sample well with your hand or
other shade during the calibration.
1. Press the
ON/OFF
key, then release. Two instrument test screens will
be displayed briefly; all LCD segments followed by the percentage of
remaining battery life. When LCD displays dashes, the instrument is ready.
