LxT Manual
Acoustic Calibration
7-5
Frequency Weighting
The LxT automatically switches to C frequency weighting
and Fast detector response for calibration. This permits 250
Hz and 1000 Hz calibrators to be used. The Fast detector
response reduces the stabilization time required before
calibration.
After calibration, the LxT returns to the original frequency
and time weighting set by the user.
Calibrator
The
Calibrator
section of the
Calibrate
tab includes an
area to enter information about a calibrator and a list of
calibrators. The user may select a calibrator from the list or
enter new information about a calibrator.
Recommended Calibrator
Table 7-1 'Recommended Calibrators for Use with LxT1 and
LxT2' lists the sound level calibrators which Larson Davis
recommends for calibrating the LxT1 and LxT2.
When using a 1/4” microphone, the adaptor ADP024, a 1/4”
microphone adaptor for the 1/2” opening in the CAL150 and
CAL200 calibrators, is also required.
Calibrating the LxT1 and 377B02 microphone
The CAL200 provides a nominal pressure level of 94 dB or
114 dB. The exact levels are printed on the Larson Davis
calibration sheet that came with the calibrator. When using a
free-field microphone, the pressure level at the microphone
diaphragm is slightly different. Thus, a free field correction
of -0.12 dB (0.03 dB uncertainty at 95% confidence level)
should be applied to either of these levels. Pressure and
random incidence microphones do not require this
correction. If the calibrator and instrument are near room
Calibrator
Instrument
Calibrator
Precision
Output
Frequency
CAL200
LxT1, LxT2
Class 1
94/114 dB
1 kHz
CAL150
LxT2
Class 2
94/114 dB
1 kHz
Table 7-1 Recommended Calibrators for Use with LxT1 and LxT2
Содержание SoundExpert LxT
Страница 1: ...LxT Manual for SoundTrack LxT SoundExpert LxT TM...
Страница 55: ...4 18 Measurement Settings Tabs LxT Manual...
Страница 81: ...5 26 View Spectrum Normalized Optional LxT Manual...
Страница 93: ...6 12 Data Storage After Improper Shutdown LxT Manual...
Страница 110: ...LxT Manual Certification 7 17...
Страница 143: ...11 6 Control Panel Data Explorer LxT Manual...
Страница 167: ...12 24 Options LxT Manual...
Страница 179: ...14 4 User LxT Manual FIGURE 14 5 shows the User tab FIGURE 14 5 User Tab...
Страница 185: ...15 6 File System LxT Manual...
Страница 191: ...16 6 Miscellaneous Parameters LxT Manual...
Страница 206: ...LxT Manual Technical Specifications A 9 Typical Z Weight Frequency Response...
Страница 259: ...A 62 Technical Specifications LxT Manual...