User's Manual

Sound velocity measurement
91
12.2.3 Notes and examples
Take care to follow this scheme at the bottom of the display area when selecting the
three sensors (see step 4). Otherwise the result of the calculation may be wrong.
There must be one sensor "in front" and two sensors "behind" the source of noise. The
sensors' numbers and their order on the pipe are of no importance in this process.
The source of noise is located between the sensors 1 and 2.
Entry on the Correlator: first, sensor 1 (in front of the sound source), then sensors 2 and
3 (behind the sound source).
The source of noise is located between the sensors 2 and 3.
Possible entry: first, sensor 2, then sensors 3 and 4.
Possible entry: first, sensor 3, then sensors 2 and 1.
Example 1:
Example 2: