Vaisala HMM100 - Manual (Page 27)

Chapter 3 ________________________________________________________________ Installation
VAISALA ________________________________________________________________________ 25
Verifying the Installation
To verify that the module has been installed correctly:
- Power up the module and check the output reading, preferably using a
humidity reference.
- Optional: connect to the service port and use the ATEST command to
set the analog output to desired voltage or current. Verify that your
measurement system shows the correct reading. See section Select
Analog Output Quantity and Scaling on page 45.
Note that ATEST is one of the advanced serial commands that must
be activated using the PASS command.