13
Adjustment
If the
testo 650/400
is used for adjustment, you will also
need the cable, Part no. 0409.0214 and precision
humidity probe 0636.9741.
Note
The following describes a 1-point adjustment. This is
only advised if hygrotest 600 is operated close to the
adjustment point (working point).
Before opening the transmitter:
- interrupt the control circuit of the transmitter;
1. Remove the cover of the transmitter.
2. Plug the connecting cable into the micromatch
connection on the transmitter board or display board
(see diagram).
3. Set up transmitter control circuit.
If you are using a display, you must interrupt
communication between the display and the
transmitter. To do this, press the
key for at least
3 seconds. Communication of the display is
interrupted and the display unit shows dashes
(
- - - -
).
4. Plug the precision humidity probe into the right port
and the connecting cable into the left port of the
testo 650
or
testo 400
reference instrument.
5. Attach the precision humidity probe immediately
adjacent to the probe of the transmitter in order to
obtain comparable values.
6. Switch on testo 650/400. The two-part display will
show the values of the transmitter on the left, and the
values of the reference instrument on the right.
Two options are available for adjustment:
1. Adjustment with the reference instrument testo
650/400 and precision humidity probe from testo.
2. Adjustment with reusable saturated salt solutions
11.3 %RH and 75.3 %RH (control and adjustment
set).
Adjustment with testo 650/400
Caution!
Heated
humidity probe
Reference
probe
26.4%rF 27.2%rF
25.1°C 26.2°C
Micromatch connection
Display port and port for scaling
adapter or handheld instrument for
adjustment. Protection pin on right
