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If the 0628 0009 probe is connected it is possible to calculate the degree of turbulence for the
velocity value in accordance with DIN 1946, Part 2.
Allocate to one of the function buttons.
Similar to all other thermal probes the 0628.0009 probe is pressure-compensated in testo 400. For
this reason set the current absolute pressure in the main menu under Special - Parameter.
Alternatively the absolute altitude is sufficient in most cases. The standard value of 1013 or 0 mbar
can be input in the case of barometric pressure and differential pressure.
Select the location and activate the printer.
Once the function button is pressed calculation of the degree of turbulence is started.
The whole process takes 180 s. The degree of turbulence is shown in % based on the following
formula:
and start a new measuring cycle.
measures the degree of turbulence before the 180 s have elapsed.
pressed while the results are displayed leads back to standard measuring.
In the case of protocols saved in the memory, the degree of turbulence is found under .
Press the button
while the results are
being displayed and you
will receive a printout of
your measurement.
Info
End
End
StartContinue
Turb.
Turb.
Velocity measurement
Measuring and printing degree of turbulence
Turb =
Σ (
υ
i
-
υ)
2
υ
1
n-1
x 100
i=1
n
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