3
Calibration
Understanding calibration
It must be emphasized that repeatability is essential to calibra-
tion. A "calibration" is based on repeatable "hard" numbers for
reference materials. Reference values can be plotted on a
graph, or the instrument can be adjusted to be direct reading.
Direct-reading calibration of the Advanced Instruments Model
3320 is a simple procedure that requires no adjustment of the
instrument by the user. Simply run the menu-driven calibration
program, which prompts the user to run a series of tests using
calibration standards at 50 mOsm/kg H
2
O, 850 mOsm/kg H
2
O,
and if selected, 2000 mOsm/kg H
2
O. When the tests are com-
plete, the Advanced Instruments Model 3320 then calculates and
stores the calibration coefficients.
To optimize the performance of the Advanced Instruments
Model 3320, an optional third calibration point at 2000
mOsm/kg H
2
O can be used. Please refer to Chapter 4 - User
Interface: Setup Menu for more information.
Calibration procedure
1. When the display reads "Osmometer Ready", press the
[NEXT] button until [CALIB] appears over the left button.
Press it to initiate the calibration procedure. Calibration
can be cancelled without changing the existing calibration
by pressing the [EXIT] button.
2. Display will briefly read "50 mOsm Calibration" and then
prompt the user to insert a 50 mOsm calibration standard.
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