Larson Davis SoundTrack LxT, User Manual

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16 LxT2
LxT Manual
e) Linear Operating Range
A-weighted sound levels for the LxT2 at the upper and lower limits of the linear operating ranges.
f) Linear Measurements Starting Level
The starting point for measuring the level linear errors on the reference range is 114 dB.
g) Electrical Insert Signals
The electrical design of the input device to insert electrical signals into the preamplifier for the
375A02 microphone is a series 18pF ± 5% capacitor. The Larson Davis ADP005 is used for this
purpose. The ADP005 can be used for noise floor measurements by attaching the included short on the
front of the ADP005.
31.5 Hz 1 kHz 4 kHz 8 kHz 12.5 kHz
77 dB to 99.6 dB 34 dB to 139 dB 33 dB to 138 dB 36 dB to 137.9 dB 38 dB to 134.7 dB
Larson Davis LxT2 with PRMLxT2B Preamp and 375B02 Microphone
adjustment data of A-weighted levels used for periodic testing
0° Free Field 0° Free Field
0° Free Field Corrections 0° Free Field Corrections expanded
Corrections with WS Corrections with WS uncertainty
from from from from of Corrections
B&K 4226 B&K 4226 B&K UA0033 B&K UA0033 @ 95%
Frequency Calibrator¹ Calibrator¹ EA¹ EA¹ confidence
Hz dB dB dB dB dB
31.6 -0.4 -0.6 -0.4 -0.6 0.25
63.1 -0.3 -0.5 -0.4 -0.6 0.25
125.9 -0.4 -0.6 -0.3 -0.5 0.25
251.2 -0.3 -0.5 -0.2 -0.4 0.25
501.2 -0.1 -0.2 -0.1 -0.2 0.25
1000.0 0.0 0.0 0.0 0.0 0.25
1995.3 0.3 0.5 0.3 0.5 0.30
3981.1 1.2 1.2 1.1 1.1 0.35
7943.3 4.2 4.0 3.2 3.0 0.40
12589.3 6.3 6.4 6.4 6.0 0.50
15848.9 8.1 7.1 8.6 7.6 0.60
¹add numbers in this column to levels read on the LxT to correct to the 0° Free Field level at a specific frequen cy
EA - Electrostatic Actuator
WS - Wind Screen