User's Manual

8 Tips and assistance
22
1. Using the arrow keys, navigate to the required folder and press
.
2. Select the menu item Total Volume Flow and confirm with .
- The single measurements and the total volume flow are
displayed.
6.6. Transferring measurement data to the PC
1. Connect the testo 420 to your PC using the USB cable.
- The testo 420 switches on automatically, a window appears on
the PC, select Open folder here. The folders and files saved on
your testo 420 are displayed. The files are available in the file
format *.txt.
7 Maintaining the product
7.1. Cleaning the instrument
Do not use any aggressive cleaning agents or solvents!
Mild household cleaning agents or soap suds may be used.
> If the housing of the instrument is dirty, clean it with a damp
cloth.
8 Tips and assistance
8.1. Questions and answers
Question Possible causes/solution
For selected parameters,
no values are shown on
the instrument display
(-----)
No temperature/humidity probe is
connected, for instance.
Warning message
Can not
turn on! when selecting
certain parameters in the
Display menu.
This parameter is not available for the
application currently selected.
8.2. Error messages
Question Possible causes/solution
xx
xx