testo 6651 Ethernet
- 1.3 Commissioning
55
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.
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.
The 1-point adjustment can be performed
via the user menu (see
chapter 1.4.6.8, page 72)
or
via the P2A software (see
volume 2, Chapter 3, page 113)
or
directly by means of a Testo handheld instrument (testo 400/650) (see
description of how to proceed below).
Please note that the 1-point adjustment is generally
performed on the basis of the % RH and °C/°F parameters.
Deviation
after
before
Working range
WP
e.g. scale = 0 to 100 % RH
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