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3.3 Checking Before Use
When the preliminary check function is ON, you can check repeatability with pH7 standard
solution. Use this function to check measurement accuracy by checking repeatability.
An operation guide is displayed after the 2nd point calibration is completed. Check the
repeatability according to the operation guide.
This preliminary check function is possible only when the standard solution is set to
NIST, NIST2, USA, or China.
When the standard solution is set to CUSTOM, this function cannot be performed.
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1.
When calibration for all of the points is
completed, the repeatability is automatically
checked.
2.
This repeatability check confirms the deviation
from the calibrated value by the standard
solution of pH7.
For example, the sequence for the 2nd point cal-
ibration by pH7 and pH4 is as follows.
pH7 (Calibration of 1st point) --> pH4 (Calibra-
tion of 2nd point) --> pH7 (Repeatability check
with the calibrated value by 1st point)
Screen display
OK(0)
OK(1)
OK(2)
ERROR
Repeatability
Within ±0.005 pH
Within ±0.02 pH
Within ±0.05 pH
Over ±0.05 pH
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