Notes 25
Analyzing/testing
the
instrument:
The required instrument file is selected.
1 Click on Test/analyze transmitter button.
2 Perform tasks:
Options
· Carry out factory reset: Reset the parameter unit, scaling limits and adjustment to the factory settings
(Values instrument-specific, see specification plate).
· Transmitter tests (voltage supply via terminals required): Current reading displayed and analog output test
carried out for each channel; see below for procedure.
· Min./max. values: Change to display of minimum/maximum values.
Procedure: testing analog output (voltage supply via terminals required)
1 Choose channel.
2 Connect reference multimeter (min. 6.5 digits resolution) to the analog output terminals of the transmitter.
3 Set the default value in the P2A Software and click on Activate.
4 Compare value displayed with reference value of multimeter.
3 To leave the analyzing/test screen, click on OK.
Carrying
out/resetting
a
1-ppoint
adjustment
(offset):
A testo 400/600 with precision humidity probe is recommended as the
reference measuring instrument.
1 Click on Adjust transmitter button.
2 Select the channel under 1-point adjustment.
3 Expose the reference measuring instrument and the instrument to be
adjusted to the same constant conditions and wait for equalization period
to lapse.
4 Enter reference value and perform adjustment by clicking on Carry out 1-
point adjustment.
To reset an offset value, click on Set Offset to zero.
5 Click on OK to confirm entries.
Carrying
out
a
2-ppoint
adjustment:
1 Click on Adjust transmitter button.
2 Select the adjustment point under 2-point adjustment.
3 Position the entire testo 6621-A01 (wall) or the probe shaft of the testo
6621-A02/A03 in a precision humidity generator/air conditioning cabinet
and route the USB cable to the P2A Software outwards.
4 To set the humidity generator: Temperature of 25 °C and humidity of
11.3 % RH or 75.3 % RH (depending on adjustment point chosen).
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