Larson Davis 831 - Page 493

A-56 Frequency Response Model 831 Manual
Broadband Noise Levels
The A, C and Z-weighted self-generated noise levels, including 377B02 microphone are presented in
Table A-24.
Table A-24 831 Self-generated Noise
Microphone Preamplifier Specifications
For PRM2103 preamplifier specifications, see the PRM2103 Manual.
1
with ADP043
FIGURE A-35 Model 831 with Various Microphones and Preamplifiers
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Nominal Nominal
Preamplifier Microphone Microphone Preamplifier
Type Type Sensitivity Gain High Low
mV/Pa dB mV/Pa dB re. 1V/Pa dB re. 1V/Pa dB re. 1V/Pa
PRM831 377B02 50 -0.1 49.4 -26.1 -23.1 -29.1
PRM831 377B20 50 -0.1 49.4 -26.1 -23.1 -29.1
PRM831¹ 377B01 2 -2.1 1.57 -56.1 -52.1 -60.1
PRM831¹ 377B10 1 -2.1 0.79 -62.1 -58.1 -66.1
426A12
0 dB Gain 377B02 50 -0.1 49.4 -26.1 -23.1 -29.1
426A12
20 dB Gain 377B02 50 19.9 494.3 -6.1 -3.1 -9.1
426A12
0 dB Gain 377B20 50 -0.1 49.4 -26.1 -23.1 -29.1
426A12
20 dB Gain 377B20 50 19.9 494.3 -6.1 -3.1 -9.1
Nominal Sensitivity at 831 Input Sensitivity Limits