Operating instructions

40
Calibration, Adjustment
“isoTEST”*
Purpose
Calibration is the determination of the
difference between the weight read-
out and the true weight (mass) of a
sample. Calibration does not entail
making any changes within the scale.
Adjustment is the correction of this
difference between the measured
value displayed and the true weight
(mass) of the sample, or the reduction
of the difference to an allowable level
within maximum permissible error
limits.
Using Verified Scales as Legal
Measuring Instruments in the EU**
Before using your scale as a legal
measuring instrument, you must per-
form "internal calibration" at the place
of installation after the warmup peri-
od.
* isoTEST = TEST in the US and
Canada
** including the Signatories of the
Agreement on the European
Economic Area
Features
The isoTEST function lets you check
your inspection, measuring or test
equipment at any time by pressing a
key. The scale is calibrated and any
deviation from the last adjustment is
displayed. Press the
Start soft key
at this point to adjust the scale. If you
do not wish to have the scale
adjusted, press the
End soft key to
exit the isoTEST function.
Your scale can be calibrated
externally (Scale menu: CAL/isoTST
key function; menu item
Ext.
cal./ adj.;factory-def.
wt.
or Ext. cal./adj.;
user-defined wt.
).
External calibration can be performed
– using a preset weight value
Ext.
cal./adj.; factory-
def. wt.
, or
– with a user-defined weight
Ext.
cal./adj.; user-
defined wt
.
Adjustment can be performed
– automatically following calibration:
Cal., then auto
adjust.
or
– if desired, the adjustment operation
can be started manually after cali-
bration:
Cal., then
manual adjust
You can configure whether the
calibration mode
– is activated according to the
specific setting (external/internal)
or
– can be user-selected after the
Cal/isoTST soft key is
pressed:
Selection mode
You can have the scale automatically
display an adjustment prompt after a
certain time interval has elapsed since
the last calibration/adjustment or
when the ambient temperature chan-
ges by a defined amount.
You can have the calibration/
adjustment results documented in an
ISO/GMP-compliant printout; see
page 125.
External Calibration in Verified
Scales
– External calibration is blocked
when the scale is used in legal
metrology (the menu access
switch is sealed off)
>External calibration can be relea-
sed only after removing verificati-
on control seal, which voids the
validity of the verification and the
scale must be re-verified
– External calibration can now be
performed