Manual

61
Advanced Functions
3.
Set compensation correction value for
CAL.2
under SETUP to
- 0.4
°C:
h
°C
°C
°C
4.
After the calibration procedure, the reference instrument should display
35 °C
.
5.
With
CAL.1
, another compensation temperature below
CAL.2
can be programmed in the
same way, and with
CAL.3
, one above this.
If all
compensation correction values are set to
0.0
°C, the factory calibration settings are
restored.
7.8.2
Humidity calibration
The cooled incubator can be calibrated for the individual customer by means of two balance
points at 20 and at 80 % relative humidity. For each selected balance point, a positive or nega-
tive compensation correction value can be set between –5 % and +5 %.
rh 20
+3,0 %
rh 80
-2,0 %
60%
40%
0%
20%
80% 100%
Default calibration
Fig. 29
Humidity calibration (example)
Setting:
Setting:
1.
Set the desired humidity balance point in the SETUP (
see page
53
)
and set the accompany-
ing compensation correction value to
0.0°C.
2.
With a reference instrument, measure the deviation in the stationary state in the selected
humidity balance point.
3.
Under SETUP, adjust the compensation correction value. If the measured reference humid-
ity is too low, the compensation correction value must be set with a negative sign.
4.
Perform a control measurement with the reference instrument.
The procedure can be performed with humidity balance points of 20 % rh and 80 % rh.