NTi Audio XL2 Sound Level Meter - Manual (Page 79)

79
Reverberation Time RT60
13 Uncertainty Factor
The uncertainty factor is displayed in the RT60 average re-
sult page. It indicates the uncertainty of the averaged mea-
surement results, reduces as more cycles are measured,
and depends on the measured reverberation time and the
bandwidth of the individual frequency band; lower bands
show a higher uncertainty factor. The number of measure-
ment cycles is displayed at
5 .
14 Overall Reverberation Time Test Result
Readout of reverberation time and uncertainty factor.
Uncertainty factor. For more details see 13 .
Reverberation time measurement results.
15 X-Axis
RT60 Octave Bands 63Hz - 8 kHz
16 Cursor Readout
Select the individual frequency band and read out the fol-
lowing numeric measurement results
Uncertainty factor in % or correlation in %. •
Reverberation time RT60 (T20), of the selected frequen- •
cy band, in seconds (s).
17 Measurement Result Selection
The RT60 measurement function allows consecutive mea-
surements within one test sequence. An averaged test re-
sult of all measurements is automatically calculated.
Select CYC and scroll with the rotary wheel through the
individual test result cycles showing
Last Last Test Result
Displays the result of last measurement cycle.
xx Single Test Cycle Results
The individual single test results are marked
with CYC xx, where xx is an incriminating num-
ber. You may delete individual test results. The
averaged reverberation time result uses only the
remaining valid measurements. To delete results
in a cycle,
Select • DEL with the rotary wheel
Confirm with enter • .
AVRG Averaged Test Result
The averaged test results of all cycles are calcu-
lated and displayed.