TESTO 6681 Profibus, Instruction Manual

Page: 32 / 154

32
testo 6681
- 1.3 Commissioning
1.3.3.1 Overview: Adjustment keys and test contacts
1 Status LED
2 Contact ch. 1 +
3 Contact ch. 1 -
4 Adjust key 11.3 %
5 Service interface
6 Adjust key 75,3 %
7 Contact ch. 2 +
8 Contact ch. 2 -
1.3.3.2 1-point adjustment (offset)
In the 1-point adjustment, the reading at the working point is raised to the
reference value so that there is no longer any deviation in the working point.
The reference condition can be measured using a precise handheld
instrument or be created in an air conditioning cabinet.
The advantage of the 1-point adjustment is the good measuring result in the
working range. But the further away the measurement is from the working
point, the greater the deviation can become. The 1-point adjustment should
therefore only be used for a relatively narrow measuring range (working
range), e.g. clean room applications, air conditioning applications for storage
and similar.
Deviation
after
before
Working range
WP
e.g. scale = 0 - 100 % RH