Calibration mode PN9
A distinction is made between a variety of
calibration modes
. The preset input behaviour is
also entered into the calibration as selected under PN0.
With
autocalibration
to the calibration point (
PN=0
), a calibration is carried out only on
PN1
(end value). For this, the CAL relay is switched 2 seconds before the measurement is taken
over. The calibration takes place on the basis of the calibration point. At 100%, it is taken over
direct into
PN1
, otherwise a percentage conversion takes place.
With
semi-automatic calibration
to the calibration point, the CAL is first switched and the unit
then waits at least 60 seconds for a further triggering of the calibration input. A calibration is
made only to
PN1
!
With
automatic calibration
to
PN1
and
PN2
(
PN9=2
), the calibration is made first to the offset
PN2
. Then the CAL is switched and the unit waits 2 seconds before automatically calibrating the
end value
PN1
.
With
semi-automatic calibration
to
PN1
and
PN2
(
PN9=3
), the offset
PN2
is, as above, first
calibrated and the CAL then switched. After this, the unit is in a waiting loop for at least 60
seconds. During this period, the trigger must be activated again so that the end value
PN1
is
taken over. Otherwise, the calibration is terminated without any changes being made.
With setting
PN9>3
, the relevant
calibration mode is triggered direct
after returning from the
programming mode by confirming
PN9
.
Calibration point PN10
Calibration point
PN10
gives the
percentage target value
for the
end value calibration
. As a
rule
,
100.00%
is preset here, in which case the measured end value is taken over directly. With
mass pressure sensors
, on the other hand, this value can be changed to
80.00%
, so that the
determined measurement must be projected to 100.00%. All other percentages can also be
preset, which means that a used reference weight does not have to correspond to the set end
value.
Trigger for calibration PN11
The selected
calibration mode
in PN9 can be triggered in various ways. If
PN11=0
is set, the
calibration can
no longer be triggered
by simply pressing a key or applying a binary signal. In
this case, a
calibration
can only be triggered via the direct start with
PN9>7
or the system
interface.
Either the digital input, the 4
th
key or a system start-up can serve as triggering. In particular,
PN11=4
is dealt with because no trigger is specified here with a
semi-automatic calibration
.
For this reason, the calibration can be also continued via the
[P]-key
.
Transducer calibration PN12
The signal input has an
integrated self-calibration
. With this, the thermal
drift and ageing
phenomena
in the signal input path can be neutralised. For areas in which
significant climate
fluctuations
are to be expected, it is possible to diminish the drift influence of the analogue
digital converter, via a cyclical calibration after
200 measurements
.
24
8. Program number description
