testo 435 Bedienungsanleitung Seite 54

54 6. Setting the instrument
The following variables can be calculated:
· Flow velocity (435-3/-4 only)
· Volumetric flow rate
· Dew point (below 0°Ctd / 32°Ftd frost point temperatures are displayed)
· Psychometric temperature
It is also possible to calculate the difference between two measurement
channels (Delta). This is only possible if the selected measurement channels
have the same unit.
Activating/deactivating r r eading c c alculation:
The main menu is open, Menu is displayed.
Calc.
1
Press
2
and confirm with
Press
3
confirm with
Activating d d ifferential c c alculation ( ( delta):
The instrument is in measurement view.
Differential calculation is performed with the parameters that are shown on
the display.
Press
1
difference is to be calculated.
Press
2
calc.
3
Press
4
.
OK
/ to select the variable that is to be activated/deactivated
.
OK
/ to select On (= activated) or Off (= deactivated) and
.
OK
and to select the measurement channels from which the
to open the main menu.
.
OK
/ to select Delta and confirm with .
OK