TESTO 6381 Instruction Manual page 55

Adjusting testo 6381 using adjustment keys
The 2-point adjustment for the adjustment points 20 %RH
and 80 %RH is carried out via the user menu.
11.3 % RH  75.3 % RH
1.5 h 1.5 h
(salt pots)
✓ The service flap of the testo 6381 is open:
1. Expose the humidity probe of the testo 6381 to the reference
condition of 11.3 % RH for at least 1.5 hours at 25 °C.
2. After this equalization period, press the
(4) for at least 10 seconds with something like a ball-point pen
that is not too sharp.
- The LED (1) flashes when the adjustment process begins. After
about 10 seconds, the
message appears on the display.
- Completion of the adjustment is signalled by the LED (1)
coming on permanently and the
shown.
11.3 % RH  75.3 %
or
RH
1.5 h
(humidity generator)
11.3 %
2-point adjustment 11.3 %
Probe reset
4 Transmitter
1.5 h
adjustment key
status
status message is
55