Sper Scientific 300036 Lab Digital Refractometer - Clinical - Manual (Page 4)

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3. OPERATING INSTRUCTIONS
3-A. General Measurement
 To avoid damage, it is important to clean the PRISM
WINDOW
before and after use.
 Press the ON/OFF button to turn the Digital Refractometer
on. The unit will automatically shut off after about 3
minutes of inactivity.
 Perform the Calibration Procedures (below).
 With the unit on, fill the PRISM WINDOW with the sample
to be measured, then close the COVER.
 Press the READ button immediately to ensure accurate
readings. Delays may cause the sample to evaporate.
3-B. Changing the Temperature Scale:
With the unit on,
press the FUNC button as needed until l.P C (or F ) is
displayed. Press the SCALE button to view the temperature
in Fahrenheit (or Celsius). Press the READ button to exit.
3-C. Automatic Temperature Compensation (ATC):
This
feature makes manual temperature correction unnecessary.
However, to obtain precise readings the sample and the unit
should be at similar ambient temperatures. ATC appears on
the LCD when this function is activated. To set the ATC
function, press the FUNC button as needed until ALC.Y (or n)
appears. Press the SCALE button to toggle between on or
off. Press the READ button twice to exit.
3-D. Calibration Procedures
 Clean the PRISM WINDOW before and after every use.
 Fill the PRISM WINDOW with a standard solution such as
distilled or deionized water. The ideal temperature of the
solution and the unit should be 65°~72°F (18°~22°C).
 Close the COVER.
 Press the ON/OFF button to turn the unit on.
 Press the ZERO button for 3 seconds.
 When the procedure is complete, CAL will be displayed.
 To check the nD value, press the ZERO button once.
 This data can be viewed at any time to show the last
calibration value.
 A flashing crosshair symbol is displayed when the
calibration solution falls outside the accepted range.