39
Instrument Operation
c. A new number may be entered one digit at a time from the
left via the numeric keypad, unless the number was input from
a barcode scan in which case pressing < will erase the whole
number.
d. Press ENTER to store the new setting and continue the test. Press
START to Continue will begin to scroll across the display.
e. Press START (Pressing STOP would cancel the test).
The rest of the test is completely automatic. The operating head
will lower the sample probe into the sample tube in the freezing
chamber. The fan will come up to full speed and the freezing
chamber will cool.
The sample temperature will follow the freezing curve shown in the
Foreword, and will be displayed as soon as it falls below 0°C.
The 3250 will freeze the sample at a fixed crystallization point,
follow the plateau development, determine the osmolality, and lock
the result on the display.
Note If the STOP key is pressed while a test is in progress, the
test will be discontinued and the 3250 will reset itself for
the next test.
Note Sample ID# information will be printed on the printout and
presented via the RS-232 port at the end of the test.
8. When the display reads Osmolality XXX mOsm, the operating head
will automatically return to the start position, and the printer will
print out the results.
Note If the wrong osmolality range has been selected, an error
message will replace the osmolality report. Use the select
range procedure to select the required range; then test
another aliquot.
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