TESTO 6681 Instruction Manual page 58

testo 6681 Ethernet
58
1.3.5.1 Overview: Adjustment keys and test contacts
1.3.5.2 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 (e.g. testo 400/650
with precision humidity probe) or be created in an air conditioning cabinet.
Deviation
WP
Working range
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.
- 1.3 Commissioning
after
before
e.g. scale = 0 - 100 % RH
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 -