Adjusting The Instrument - TESTO 6681 Profibus Instruction Manual

1.3.6 Adjusting the instrument

The testo adjusting concept allows the entire signal chain from the sensor
signal (probe) and the digital signal (within the transmitter) through to the
analog signal (transmitter output signal) to be adjusted (see diagram).
1-point adjustment
Adjustment via
testo 400/650 handheld
instrument with
adjustment adapter
P2A software
User menu
Either the 1-point adjustment or 2-point adjustment is suitable for adjusting
the sensor signal - digital signal chain.
The testo 6681 transmitter has digital probes whose adjustment information
is stored in the probes' internal memory. Both 1-point and 2-point
adjustments can thus be carried out on another testo 6681 (e.g. in the
calibration laboratory).
testo 6681 Profibus
2-point adjustment
Adjustment 11.3 % RH and
75.3 % RH via
Adjustment keys (1, 2)
P2A software
Adjustment 20 % rH and
80 % rH via
User menu
- 1.3 Commissioning 55
Analog adjustment
Adjustment using a precise
multimeter and transmission
of analog reference value in
P2A software or
User menu