NTi Audio XL2 Sound Level Meter - Manual (Page 96)

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1/12 Octave + Tolerance
1/12 Octave + Tolerance (optional)
The Spectral Limits Option extends the XL2 function range
with an RTA analyzer with spectral resolutions from 1/1 octave
down to 1/12th octave. Trace capturing, relative curve display
and comprehensive tolerance handling are supported in the
FFT Analysis and the high resolution 1/12 Oct + Tol spectral
analysis.
Features
High resolution RTA function “1/12 Oct + Tol” with select- •
able 1/1, 1/3, 1/6 and 1/12 octave spectral resolution
Capturing of multiple readings into the internal memory
•
Comparing measurement results against captures with rela- •
tive or absolute curve display
Comprehensive tolerance handling with tolerance masks
•
based on captures for passed/failed measurements
Export and import of tolerance and capture files
•
Frequency band listening at rear speaker •
Applications
PA-rental: Verifying the frequency response of returned •
speakers and microphones against reference records ensur-
ing they are back in stock in good working condition.
Industrial quality testing: Passed/Failed test in the production
•
line or during service of any audible quality criteria, such as
with motors, machines, vacuum cleaners, ...
Cinema: Comparing frequency responses against an ideal
•
response curve according the X-Curve requirements.
Tolerance Handling
The XL2 Analyzer compares spectral measurements against a
tolerance band and visualizes exceptions in every frequency
band. The passed/failed condition is further visualized by the
limit button and forwarded to the I/O interface of the instru-
ment in order to drive an external alarm device such the acces-
sory SPL Stack Light.
Tolerance curves can either be imported from txt-files or direct-
ly derived from captured measurements. The XL2 calculates
tolerance bands based on
Single captured results •
Manually generated txt-files on the PC •
Mean average of multiple captures •
Min/Max curves of multiple captures •