15
6. Operation and function description
6.4.5 Automatic calibration
The
IPM5
unit
generally
performs
an
automatic
calibration.
Depending
on
the
setting,
this
can
be
triggered
via
the
4th
key
or
the
digital
input.
During
calibration,
the
sensor
must
be
free
of
pressure
or
the
balance
is
without
any
load.
Since,
in
the
case
of
the
IPW5
,
manual
intervention
is
generally
required,
the
semi-automatic
calibration
takes
effect
here.
The calibration procedure is as follows:
Press
[CAL]-key
⇒
Display of "CAL1"
⇒
1 second
⇒
Determine offset value
⇒
display measurement for 2 seconds
In semi-automatic calibration mode, this is followed by:
⇒
Display of "CAL2" flashing
until
[P] key
or release is activated
⇒
Display of " CAL2"
⇒
1 second
⇒
Switch CAL line against strain gauge
⇒
during display of CAL2
⇒
Determine load
value n
calibration point
⇒
display measurement for 2 seconds
If the calibration was successfully concluded,
⇒
Display of "-----"
⇒
1 second
Otherwise, if an error occurs,
⇒
Display of error message
⇒
2 seconds
The following error messages are possible (priority from 1 to 4):
•
"CErr1"
if neither offset nor end value are within the measuring range
•
"CErr2"
if the end value is not at least
±
1% of measuring range greater than offset
•
"CErr3"
if the end value is outside the measuring range
•
"CErr4"
if the offset or end value at PN0 = 1, 2 or 3 is 10% <> expected value
•
"CErr5"
termination of semi-automatic calibration after 60 seconds
6.4.6 Taring
In weighing technology, a taring process is generally carried out before proceeding with a
measurement. This involves setting the display value for the current sensor value to zero.
For these two cases, the standard taring procedure is as follows:
⇒
Display of “
00000
"
⇒
1 second
⇒
Determine offset value
⇒
in measuring time
⇒
Display of "oFAIL" if measuring range overflow
⇒
2 seconds
With rapid taring, only one error message, if available, is displayed. No message is sent if the
taring process was successful as this is frequently not desired.
6.4.7 Hold-function
The Hold-function is always active in the background. If the digital input is deactivated, the Hold-
value is permanently overwritten by the current measurement. Only when the digital input is
activated the last measured measurement is recorded as long as the digital input remains
activated. The function is purely static and can only be operated via the digital input.
