YSI P 700 IQ Analyzer - Manual (Page 55)

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P 700 IQ
2-point calibration The current slope and the offset of the characteristic curve are adjusted
with a 2-point calibration.
2-point calibration with two different standards can only be started man-
ually from the calibration and service menu. See section 4.2.3,  58.
Calibration record /
calibration history
The result of a calibration procedure is stored in the calibration record
and calibration history and can be viewed afterwards (see the relevant
IQ S
ENSOR N ET system operating manual).
Maintenance condition During the calibration procedure the P 700 IQ is in the so-called main-
tenance condition. All linked outputs remain in their current status. After
a manual calibration has been finished the maintenance condition has
to be switched off manually. More detailed information on the mainte-
nance condition is given in the respective IQ S
ENSOR N ET system oper-
ating manual.
Calibration steps Each calibration procedure takes place in several steps:
1 Draw calibration standard and rinse the measuring circle with cal-
ibration standard
2 Measure the absorbance of the calibration standard without
reagent (blank value)
3 Add the reagent
4 Leave to react for the reaction time
5 Measure the absorbance of the calibration standard with reagent
4.2.2 1-point calibration
Automatic
1-point calibration
1-point calibration is carried out automatically at regular intervals during
the measuring operation.
The settings for the calibration interval and calibration time are done in
the menu of the sensor settings.
The standard used for automatic 1-point calibration is identified auto-
matically. The following standards can be used for automatic 1-point
calibration: ST 1.6, ST 8.0, ST 20.0.
Setting the calibration time and calibration interval (see chapter 4.1.4
Settings for the P 700 IQ,  51).
Manual
1-point calibration
1-point calibration can be started as a manual calibration procedure as
necessary at any time. The calibration procedure is started and the
standard to be used is set in the calibration and service menu. The fol-