26
Stat Fax 303 Plus Operator’s Manual Rev. J
Awareness Technology, Inc.
After the first strip is read (and the test is valid) the display will prompt “
C/O Abs OK Y/N”
. If the
cutoff value is acceptable, press YES. If the cutoff value is not acceptable, press NO. If the test
is stored, the display will prompt
“Recall Test Y/N”
. If the test is not stored, the display will
prompt “
Re Start Y/N”
. In either case, press YES to run the test again, press NO to return to
“
C/O Abs OK Y/N”
, or press the CLEAR key twice to cancel the mode.
If the test is invalid for any reason,
“Test is invalid”
will be printed after the control readings and
only the absorbance readings will be printed.
The instrument will be ready for the next strip when it displays
“Set Carrier”
,
“Then Press
Enter”
. To continue reading in the Cutoff mode, load the next strip and press the ENTER key.
Press CLEAR twice to cancel the mode.
Reverse Cutoff Mode:
The Reverse Cutoff Mode provides the ability to interpret low absorbances as positive results.
Answer
“N”
to the prompt
“POS IF > C/O Y/N”
, then answer
“Y”
to the prompt
“POS IF < C/O
Y/N”
. This will label results
“P”
if they are below the cutoff absorbance and
“N”
if they are
above the cutoff. Blank, positive and negative controls, coefficients, and cutoff parameters are
entered following the displayed prompts, which occur in the same order described in the regular
cutoff mode.
NOTE: Be sure to read the “<=” and “=>” signs in each display, because blank, positive
control, and negative control parameters are entered in a reverse way when using this
option.
Note that the blank is not subtracted from subsequent sample absorbances. All other
calculations and criteria for an acceptable run in the Reverse Cutoff Mode are identical to those
in the regular Cutoff Mode.
2.2.4 Cutoff Control Mode (C/O Control)
In this mode, instead of using the means of the negative and positive controls to determine the
cutoff, controls (labeled CCs) are used to do so. The positive and negative controls are used for
QC criteria.
To select this mode, press the CUTOFF key. The display will then show
“C/O Control Y/N”
.
Press YES.
After the filters are selected, if you chose no differential, the Offset Absorbance questions will
follow (see section 2.4.5-Differential Absorbances for instructions).
The display will show “
BLANK Y/N”
. Press NO for the photometer to blank on air. Press YES,
and the instrument will display
“Blank <= ?”
. The reader will use this value to check that the
blank is valid. Type the greatest acceptable absorbance value for the blank material relative to
air, and then press ENTER. The blank absorbance will be subtracted from all subsequent wells,
and will be flagged if it exceeds the set limit.
The display shows:
“Equiv Range Y/N”
. If you answer YES, you will be able to enter an
equivocal range based on factors of the cutoff value. The instrument will prompt
“NEG<X*COV;X=”
.
Summary of Contents for 303 Plus
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