Calibration
43
Calibration of the HDM99
Adjustment
The entire calibration of the device is software controlled. Operate the
function key
adjust
in the main menu to reach this function. You will be
asked to enter a code via the numeric keyboard. This code is also
1704,
and
must be confirmed with >
ENTER
<. After that, you are in the
adjust
menu.
The adjustment of the individual channels is slightly different. The pH- and
voltage measurement is adjusted at two points. The temperature and
pressure measurement is adjusted at minimally two points, alternatively up
to six points. The advantage of more than two calibration points is the
higher precision of the measurement as the non-linearity of the sensors will
be equalized . The sequence of the calibration in reference to the level of
the values is insignificant. Please note, that each value may be entered only
once, since the system does not accept the data otherwise. The display will
show
invalid data
.
The conductivity calibration results from measuring the cell parameter.
Only one calibration point is necessary here.
