- 12 -
Description
：
a
．
"Calibration" indicates the interface function shows on the top of the screen, number
next to the standard is the conductivity value which is calibrated of the standard block
at 20
℃
conditions (the values setting method see 5.3.4.5 calibration block setting).
b
．
Numerical in the middle line of the screen represented the conductivity value of the
testing block after calibration at 20
℃
(unit of measurement instrument for the default
unit)
c
．
a
H
=□□□□ (low value a
L
=□□□□) of the screen bottom is temperature coefficient for the
high value calibration block, the remaining meaning and setting of symbol σ(Tc)
、
T
A
、
f is the same as measurement interface .( see 5.3.2.3, 5.3.2.5)
5.3.3.4 Items before calibration
Before calibration, make sure temperature of the probe, testing block and external environment
is stable, then select the temperature compensation value T
C
of calibration block according to
different temperature compensation modes (methods is the same as the measuring interface, see
5.3.3.5 High value block calibration
Enter the calibration interface, the instrument performance high value blocks calibration first
(digital display next to the "calibration" at the top of the screen is setting value σ
H
(20) , shown
below is the standard temperature coefficient value a
H
), probe vertical flat on surface of the high
value block which has the same setting value of sigma σ
H
(20)
、
a
H
, measuring the conductivity
value.
a
．
When the measured value is equal to the setting value σ
H
(20), does not need to
calibrate high value, probe is placed back into the air, press the "OK" key, the
instrument into the low value of the standard calibration block.
b
．
When the measured value is not equal to the setting value, keeping the probe touch
with the standard block, the instrument enters the automatic calibration when press the
"OK" key, and issue a tone after completion.
c
．
Back to calibration block again, if the error is more than 0.3%, re-calibration
according to step b, until meet the requirements, then put the probe back into air, press
